867 lines
28 KiB
C
867 lines
28 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdarg.h>
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#include "py/runtime.h"
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#include "py/stream.h"
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#include "py/mperrno.h"
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#include "py/mphal.h"
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#include "lib/utils/interrupt_char.h"
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#include "lib/utils/mpirq.h"
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#include "uart.h"
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#include "irq.h"
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#include "pendsv.h"
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#if defined(STM32F4)
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#define UART_RXNE_IS_SET(uart) ((uart)->SR & USART_SR_RXNE)
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#elif defined(STM32H7)
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#define UART_RXNE_IS_SET(uart) ((uart)->ISR & USART_ISR_RXNE_RXFNE)
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#else
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#define UART_RXNE_IS_SET(uart) ((uart)->ISR & USART_ISR_RXNE)
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#endif
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#define UART_RXNE_IT_EN(uart) do { (uart)->CR1 |= USART_CR1_RXNEIE; } while (0)
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#define UART_RXNE_IT_DIS(uart) do { (uart)->CR1 &= ~USART_CR1_RXNEIE; } while (0)
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#define USART_CR1_IE_BASE (USART_CR1_PEIE | USART_CR1_TXEIE | USART_CR1_TCIE | USART_CR1_RXNEIE | USART_CR1_IDLEIE)
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#define USART_CR2_IE_BASE (USART_CR2_LBDIE)
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#define USART_CR3_IE_BASE (USART_CR3_CTSIE | USART_CR3_EIE)
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#if defined(STM32F0)
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#define USART_CR1_IE_ALL (USART_CR1_IE_BASE | USART_CR1_EOBIE | USART_CR1_RTOIE | USART_CR1_CMIE)
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#define USART_CR2_IE_ALL (USART_CR2_IE_BASE)
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#define USART_CR3_IE_ALL (USART_CR3_IE_BASE | USART_CR3_WUFIE)
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#elif defined(STM32F4)
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#define USART_CR1_IE_ALL (USART_CR1_IE_BASE)
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#define USART_CR2_IE_ALL (USART_CR2_IE_BASE)
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#define USART_CR3_IE_ALL (USART_CR3_IE_BASE)
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#elif defined(STM32F7)
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#define USART_CR1_IE_ALL (USART_CR1_IE_BASE | USART_CR1_EOBIE | USART_CR1_RTOIE | USART_CR1_CMIE)
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#define USART_CR2_IE_ALL (USART_CR2_IE_BASE)
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#if defined(USART_CR3_TCBGTIE)
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#define USART_CR3_IE_ALL (USART_CR3_IE_BASE | USART_CR3_TCBGTIE)
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#else
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#define USART_CR3_IE_ALL (USART_CR3_IE_BASE)
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#endif
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#elif defined(STM32H7)
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#define USART_CR1_IE_ALL (USART_CR1_IE_BASE | USART_CR1_RXFFIE | USART_CR1_TXFEIE | USART_CR1_EOBIE | USART_CR1_RTOIE | USART_CR1_CMIE)
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#define USART_CR2_IE_ALL (USART_CR2_IE_BASE)
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#define USART_CR3_IE_ALL (USART_CR3_IE_BASE | USART_CR3_RXFTIE | USART_CR3_TCBGTIE | USART_CR3_TXFTIE | USART_CR3_WUFIE)
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#elif defined(STM32L0)
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#define USART_CR1_IE_ALL (USART_CR1_IE_BASE | USART_CR1_EOBIE | USART_CR1_RTOIE | USART_CR1_CMIE)
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#define USART_CR2_IE_ALL (USART_CR2_IE_BASE)
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#define USART_CR3_IE_ALL (USART_CR3_IE_BASE | USART_CR3_WUFIE)
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#elif defined(STM32L4) || defined(STM32WB)
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#define USART_CR1_IE_ALL (USART_CR1_IE_BASE | USART_CR1_EOBIE | USART_CR1_RTOIE | USART_CR1_CMIE)
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#define USART_CR2_IE_ALL (USART_CR2_IE_BASE)
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#if defined(USART_CR3_TCBGTIE)
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#define USART_CR3_IE_ALL (USART_CR3_IE_BASE | USART_CR3_TCBGTIE | USART_CR3_WUFIE)
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#else
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#define USART_CR3_IE_ALL (USART_CR3_IE_BASE | USART_CR3_WUFIE)
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#endif
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#endif
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extern void NORETURN __fatal_error(const char *msg);
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void uart_init0(void) {
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#if defined(STM32H7)
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RCC_PeriphCLKInitTypeDef RCC_PeriphClkInit = {0};
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// Configure USART1/6 clock source
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RCC_PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART16;
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RCC_PeriphClkInit.Usart16ClockSelection = RCC_USART16CLKSOURCE_D2PCLK2;
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if (HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphClkInit) != HAL_OK) {
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__fatal_error("HAL_RCCEx_PeriphCLKConfig");
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}
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// Configure USART2/3/4/5/7/8 clock source
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RCC_PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART234578;
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RCC_PeriphClkInit.Usart16ClockSelection = RCC_USART234578CLKSOURCE_D2PCLK1;
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if (HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphClkInit) != HAL_OK) {
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__fatal_error("HAL_RCCEx_PeriphCLKConfig");
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}
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#endif
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}
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// unregister all interrupt sources
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void uart_deinit_all(void) {
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for (int i = 0; i < MP_ARRAY_SIZE(MP_STATE_PORT(pyb_uart_obj_all)); i++) {
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pyb_uart_obj_t *uart_obj = MP_STATE_PORT(pyb_uart_obj_all)[i];
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if (uart_obj != NULL && !uart_obj->is_static) {
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uart_deinit(uart_obj);
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MP_STATE_PORT(pyb_uart_obj_all)[i] = NULL;
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}
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}
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}
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bool uart_exists(int uart_id) {
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if (uart_id > MP_ARRAY_SIZE(MP_STATE_PORT(pyb_uart_obj_all))) {
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// safeguard against pyb_uart_obj_all array being configured too small
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return false;
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}
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switch (uart_id) {
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#if defined(MICROPY_HW_UART1_TX) && defined(MICROPY_HW_UART1_RX)
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case PYB_UART_1:
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return true;
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#endif
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#if defined(MICROPY_HW_UART2_TX) && defined(MICROPY_HW_UART2_RX)
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case PYB_UART_2:
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return true;
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#endif
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#if defined(MICROPY_HW_UART3_TX) && defined(MICROPY_HW_UART3_RX)
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case PYB_UART_3:
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return true;
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#endif
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#if defined(MICROPY_HW_UART4_TX) && defined(MICROPY_HW_UART4_RX)
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case PYB_UART_4:
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return true;
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#endif
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#if defined(MICROPY_HW_UART5_TX) && defined(MICROPY_HW_UART5_RX)
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case PYB_UART_5:
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return true;
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#endif
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#if defined(MICROPY_HW_UART6_TX) && defined(MICROPY_HW_UART6_RX)
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case PYB_UART_6:
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return true;
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#endif
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#if defined(MICROPY_HW_UART7_TX) && defined(MICROPY_HW_UART7_RX)
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case PYB_UART_7:
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return true;
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#endif
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#if defined(MICROPY_HW_UART8_TX) && defined(MICROPY_HW_UART8_RX)
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case PYB_UART_8:
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return true;
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#endif
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#if defined(MICROPY_HW_UART9_TX) && defined(MICROPY_HW_UART9_RX)
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case PYB_UART_9:
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return true;
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#endif
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#if defined(MICROPY_HW_UART10_TX) && defined(MICROPY_HW_UART10_RX)
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case PYB_UART_10:
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return true;
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#endif
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default:
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return false;
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}
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}
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// assumes Init parameters have been set up correctly
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bool uart_init(pyb_uart_obj_t *uart_obj,
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uint32_t baudrate, uint32_t bits, uint32_t parity, uint32_t stop, uint32_t flow) {
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USART_TypeDef *UARTx;
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IRQn_Type irqn;
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int uart_unit;
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const pin_obj_t *pins[4] = {0};
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switch (uart_obj->uart_id) {
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#if defined(MICROPY_HW_UART1_TX) && defined(MICROPY_HW_UART1_RX)
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case PYB_UART_1:
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uart_unit = 1;
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UARTx = USART1;
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irqn = USART1_IRQn;
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pins[0] = MICROPY_HW_UART1_TX;
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pins[1] = MICROPY_HW_UART1_RX;
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__HAL_RCC_USART1_CLK_ENABLE();
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break;
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#endif
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#if defined(MICROPY_HW_UART2_TX) && defined(MICROPY_HW_UART2_RX)
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case PYB_UART_2:
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uart_unit = 2;
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UARTx = USART2;
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irqn = USART2_IRQn;
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pins[0] = MICROPY_HW_UART2_TX;
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pins[1] = MICROPY_HW_UART2_RX;
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#if defined(MICROPY_HW_UART2_RTS)
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if (flow & UART_HWCONTROL_RTS) {
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pins[2] = MICROPY_HW_UART2_RTS;
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}
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#endif
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#if defined(MICROPY_HW_UART2_CTS)
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if (flow & UART_HWCONTROL_CTS) {
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pins[3] = MICROPY_HW_UART2_CTS;
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}
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#endif
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__HAL_RCC_USART2_CLK_ENABLE();
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break;
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#endif
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#if defined(MICROPY_HW_UART3_TX) && defined(MICROPY_HW_UART3_RX)
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case PYB_UART_3:
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uart_unit = 3;
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UARTx = USART3;
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#if defined(STM32F0)
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irqn = USART3_8_IRQn;
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#else
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irqn = USART3_IRQn;
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#endif
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pins[0] = MICROPY_HW_UART3_TX;
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pins[1] = MICROPY_HW_UART3_RX;
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#if defined(MICROPY_HW_UART3_RTS)
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if (flow & UART_HWCONTROL_RTS) {
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pins[2] = MICROPY_HW_UART3_RTS;
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}
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#endif
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#if defined(MICROPY_HW_UART3_CTS)
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if (flow & UART_HWCONTROL_CTS) {
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pins[3] = MICROPY_HW_UART3_CTS;
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}
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#endif
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__HAL_RCC_USART3_CLK_ENABLE();
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break;
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#endif
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#if defined(MICROPY_HW_UART4_TX) && defined(MICROPY_HW_UART4_RX)
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case PYB_UART_4:
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uart_unit = 4;
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#if defined(STM32F0)
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UARTx = USART4;
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irqn = USART3_8_IRQn;
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__HAL_RCC_USART4_CLK_ENABLE();
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#elif defined(STM32L0)
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UARTx = USART4;
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irqn = USART4_5_IRQn;
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__HAL_RCC_USART4_CLK_ENABLE();
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#else
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UARTx = UART4;
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irqn = UART4_IRQn;
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__HAL_RCC_UART4_CLK_ENABLE();
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#endif
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pins[0] = MICROPY_HW_UART4_TX;
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pins[1] = MICROPY_HW_UART4_RX;
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#if defined(MICROPY_HW_UART4_RTS)
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if (flow & UART_HWCONTROL_RTS) {
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pins[2] = MICROPY_HW_UART4_RTS;
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}
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#endif
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#if defined(MICROPY_HW_UART4_CTS)
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if (flow & UART_HWCONTROL_CTS) {
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pins[3] = MICROPY_HW_UART4_CTS;
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}
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#endif
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break;
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#endif
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#if defined(MICROPY_HW_UART5_TX) && defined(MICROPY_HW_UART5_RX)
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case PYB_UART_5:
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uart_unit = 5;
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#if defined(STM32F0)
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UARTx = USART5;
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irqn = USART3_8_IRQn;
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__HAL_RCC_USART5_CLK_ENABLE();
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#elif defined(STM32L0)
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UARTx = USART5;
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irqn = USART4_5_IRQn;
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__HAL_RCC_USART5_CLK_ENABLE();
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#else
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UARTx = UART5;
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irqn = UART5_IRQn;
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__HAL_RCC_UART5_CLK_ENABLE();
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#endif
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pins[0] = MICROPY_HW_UART5_TX;
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pins[1] = MICROPY_HW_UART5_RX;
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break;
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#endif
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#if defined(MICROPY_HW_UART6_TX) && defined(MICROPY_HW_UART6_RX)
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case PYB_UART_6:
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uart_unit = 6;
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UARTx = USART6;
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#if defined(STM32F0)
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irqn = USART3_8_IRQn;
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#else
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irqn = USART6_IRQn;
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#endif
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pins[0] = MICROPY_HW_UART6_TX;
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pins[1] = MICROPY_HW_UART6_RX;
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#if defined(MICROPY_HW_UART6_RTS)
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if (flow & UART_HWCONTROL_RTS) {
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pins[2] = MICROPY_HW_UART6_RTS;
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}
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#endif
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#if defined(MICROPY_HW_UART6_CTS)
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if (flow & UART_HWCONTROL_CTS) {
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pins[3] = MICROPY_HW_UART6_CTS;
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}
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#endif
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__HAL_RCC_USART6_CLK_ENABLE();
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break;
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#endif
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#if defined(MICROPY_HW_UART7_TX) && defined(MICROPY_HW_UART7_RX)
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case PYB_UART_7:
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uart_unit = 7;
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#if defined(STM32F0)
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UARTx = USART7;
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irqn = USART3_8_IRQn;
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__HAL_RCC_USART7_CLK_ENABLE();
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#else
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UARTx = UART7;
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irqn = UART7_IRQn;
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__HAL_RCC_UART7_CLK_ENABLE();
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#endif
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pins[0] = MICROPY_HW_UART7_TX;
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pins[1] = MICROPY_HW_UART7_RX;
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break;
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#endif
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#if defined(MICROPY_HW_UART8_TX) && defined(MICROPY_HW_UART8_RX)
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case PYB_UART_8:
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uart_unit = 8;
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#if defined(STM32F0)
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UARTx = USART8;
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irqn = USART3_8_IRQn;
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__HAL_RCC_USART8_CLK_ENABLE();
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#else
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UARTx = UART8;
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irqn = UART8_IRQn;
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__HAL_RCC_UART8_CLK_ENABLE();
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#endif
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pins[0] = MICROPY_HW_UART8_TX;
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pins[1] = MICROPY_HW_UART8_RX;
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break;
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#endif
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#if defined(MICROPY_HW_UART9_TX) && defined(MICROPY_HW_UART9_RX)
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case PYB_UART_9:
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uart_unit = 9;
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UARTx = UART9;
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irqn = UART9_IRQn;
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__HAL_RCC_UART9_CLK_ENABLE();
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pins[0] = MICROPY_HW_UART9_TX;
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pins[1] = MICROPY_HW_UART9_RX;
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break;
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#endif
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#if defined(MICROPY_HW_UART10_TX) && defined(MICROPY_HW_UART10_RX)
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case PYB_UART_10:
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uart_unit = 10;
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UARTx = UART10;
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irqn = UART10_IRQn;
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__HAL_RCC_UART10_CLK_ENABLE();
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pins[0] = MICROPY_HW_UART10_TX;
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pins[1] = MICROPY_HW_UART10_RX;
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break;
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#endif
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default:
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// UART does not exist or is not configured for this board
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return false;
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}
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uint32_t mode = MP_HAL_PIN_MODE_ALT;
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uint32_t pull = MP_HAL_PIN_PULL_UP;
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for (uint i = 0; i < 4; i++) {
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if (pins[i] != NULL) {
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bool ret = mp_hal_pin_config_alt(pins[i], mode, pull, AF_FN_UART, uart_unit);
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if (!ret) {
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return false;
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}
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}
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}
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uart_obj->uartx = UARTx;
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// init UARTx
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UART_HandleTypeDef huart;
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memset(&huart, 0, sizeof(huart));
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huart.Instance = UARTx;
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huart.Init.BaudRate = baudrate;
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huart.Init.WordLength = bits;
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huart.Init.StopBits = stop;
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huart.Init.Parity = parity;
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huart.Init.Mode = UART_MODE_TX_RX;
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huart.Init.HwFlowCtl = flow;
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huart.Init.OverSampling = UART_OVERSAMPLING_16;
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HAL_UART_Init(&huart);
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// Disable all individual UART IRQs, but enable the global handler
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uart_obj->uartx->CR1 &= ~USART_CR1_IE_ALL;
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uart_obj->uartx->CR2 &= ~USART_CR2_IE_ALL;
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uart_obj->uartx->CR3 &= ~USART_CR3_IE_ALL;
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NVIC_SetPriority(IRQn_NONNEG(irqn), IRQ_PRI_UART);
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HAL_NVIC_EnableIRQ(irqn);
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|
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uart_obj->is_enabled = true;
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uart_obj->attached_to_repl = false;
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|
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if (bits == UART_WORDLENGTH_9B && parity == UART_PARITY_NONE) {
|
|
uart_obj->char_mask = 0x1ff;
|
|
uart_obj->char_width = CHAR_WIDTH_9BIT;
|
|
} else {
|
|
if (bits == UART_WORDLENGTH_9B || parity == UART_PARITY_NONE) {
|
|
uart_obj->char_mask = 0xff;
|
|
} else {
|
|
uart_obj->char_mask = 0x7f;
|
|
}
|
|
uart_obj->char_width = CHAR_WIDTH_8BIT;
|
|
}
|
|
|
|
uart_obj->mp_irq_trigger = 0;
|
|
uart_obj->mp_irq_obj = NULL;
|
|
|
|
return true;
|
|
}
|
|
|
|
void uart_set_rxbuf(pyb_uart_obj_t *self, size_t len, void *buf) {
|
|
self->read_buf_head = 0;
|
|
self->read_buf_tail = 0;
|
|
self->read_buf_len = len;
|
|
self->read_buf = buf;
|
|
if (len == 0) {
|
|
UART_RXNE_IT_DIS(self->uartx);
|
|
} else {
|
|
UART_RXNE_IT_EN(self->uartx);
|
|
}
|
|
}
|
|
|
|
void uart_deinit(pyb_uart_obj_t *self) {
|
|
self->is_enabled = false;
|
|
|
|
// Disable UART
|
|
self->uartx->CR1 &= ~USART_CR1_UE;
|
|
|
|
// Reset and turn off the UART peripheral
|
|
if (self->uart_id == 1) {
|
|
HAL_NVIC_DisableIRQ(USART1_IRQn);
|
|
__HAL_RCC_USART1_FORCE_RESET();
|
|
__HAL_RCC_USART1_RELEASE_RESET();
|
|
__HAL_RCC_USART1_CLK_DISABLE();
|
|
#if defined(USART2)
|
|
} else if (self->uart_id == 2) {
|
|
HAL_NVIC_DisableIRQ(USART2_IRQn);
|
|
__HAL_RCC_USART2_FORCE_RESET();
|
|
__HAL_RCC_USART2_RELEASE_RESET();
|
|
__HAL_RCC_USART2_CLK_DISABLE();
|
|
#endif
|
|
#if defined(USART3)
|
|
} else if (self->uart_id == 3) {
|
|
#if !defined(STM32F0)
|
|
HAL_NVIC_DisableIRQ(USART3_IRQn);
|
|
#endif
|
|
__HAL_RCC_USART3_FORCE_RESET();
|
|
__HAL_RCC_USART3_RELEASE_RESET();
|
|
__HAL_RCC_USART3_CLK_DISABLE();
|
|
#endif
|
|
#if defined(UART4)
|
|
} else if (self->uart_id == 4) {
|
|
HAL_NVIC_DisableIRQ(UART4_IRQn);
|
|
__HAL_RCC_UART4_FORCE_RESET();
|
|
__HAL_RCC_UART4_RELEASE_RESET();
|
|
__HAL_RCC_UART4_CLK_DISABLE();
|
|
#endif
|
|
#if defined(USART4)
|
|
} else if (self->uart_id == 4) {
|
|
__HAL_RCC_USART4_FORCE_RESET();
|
|
__HAL_RCC_USART4_RELEASE_RESET();
|
|
__HAL_RCC_USART4_CLK_DISABLE();
|
|
#endif
|
|
#if defined(UART5)
|
|
} else if (self->uart_id == 5) {
|
|
HAL_NVIC_DisableIRQ(UART5_IRQn);
|
|
__HAL_RCC_UART5_FORCE_RESET();
|
|
__HAL_RCC_UART5_RELEASE_RESET();
|
|
__HAL_RCC_UART5_CLK_DISABLE();
|
|
#endif
|
|
#if defined(USART5)
|
|
} else if (self->uart_id == 5) {
|
|
__HAL_RCC_USART5_FORCE_RESET();
|
|
__HAL_RCC_USART5_RELEASE_RESET();
|
|
__HAL_RCC_USART5_CLK_DISABLE();
|
|
#endif
|
|
#if defined(UART6)
|
|
} else if (self->uart_id == 6) {
|
|
HAL_NVIC_DisableIRQ(USART6_IRQn);
|
|
__HAL_RCC_USART6_FORCE_RESET();
|
|
__HAL_RCC_USART6_RELEASE_RESET();
|
|
__HAL_RCC_USART6_CLK_DISABLE();
|
|
#endif
|
|
#if defined(UART7)
|
|
} else if (self->uart_id == 7) {
|
|
HAL_NVIC_DisableIRQ(UART7_IRQn);
|
|
__HAL_RCC_UART7_FORCE_RESET();
|
|
__HAL_RCC_UART7_RELEASE_RESET();
|
|
__HAL_RCC_UART7_CLK_DISABLE();
|
|
#endif
|
|
#if defined(USART7)
|
|
} else if (self->uart_id == 7) {
|
|
__HAL_RCC_USART7_FORCE_RESET();
|
|
__HAL_RCC_USART7_RELEASE_RESET();
|
|
__HAL_RCC_USART7_CLK_DISABLE();
|
|
#endif
|
|
#if defined(UART8)
|
|
} else if (self->uart_id == 8) {
|
|
HAL_NVIC_DisableIRQ(UART8_IRQn);
|
|
__HAL_RCC_UART8_FORCE_RESET();
|
|
__HAL_RCC_UART8_RELEASE_RESET();
|
|
__HAL_RCC_UART8_CLK_DISABLE();
|
|
#endif
|
|
#if defined(USART8)
|
|
} else if (self->uart_id == 8) {
|
|
__HAL_RCC_USART8_FORCE_RESET();
|
|
__HAL_RCC_USART8_RELEASE_RESET();
|
|
__HAL_RCC_USART8_CLK_DISABLE();
|
|
#endif
|
|
#if defined(UART9)
|
|
} else if (self->uart_id == 9) {
|
|
HAL_NVIC_DisableIRQ(UART9_IRQn);
|
|
__HAL_RCC_UART9_FORCE_RESET();
|
|
__HAL_RCC_UART9_RELEASE_RESET();
|
|
__HAL_RCC_UART9_CLK_DISABLE();
|
|
#endif
|
|
#if defined(UART10)
|
|
} else if (self->uart_id == 10) {
|
|
HAL_NVIC_DisableIRQ(UART10_IRQn);
|
|
__HAL_RCC_UART10_FORCE_RESET();
|
|
__HAL_RCC_UART10_RELEASE_RESET();
|
|
__HAL_RCC_UART10_CLK_DISABLE();
|
|
#endif
|
|
}
|
|
}
|
|
|
|
void uart_attach_to_repl(pyb_uart_obj_t *self, bool attached) {
|
|
self->attached_to_repl = attached;
|
|
}
|
|
|
|
uint32_t uart_get_baudrate(pyb_uart_obj_t *self) {
|
|
uint32_t uart_clk = 0;
|
|
|
|
#if defined(STM32F0)
|
|
uart_clk = HAL_RCC_GetPCLK1Freq();
|
|
#elif defined(STM32F7)
|
|
switch ((RCC->DCKCFGR2 >> ((self->uart_id - 1) * 2)) & 3) {
|
|
case 0:
|
|
if (self->uart_id == 1 || self->uart_id == 6) {
|
|
uart_clk = HAL_RCC_GetPCLK2Freq();
|
|
} else {
|
|
uart_clk = HAL_RCC_GetPCLK1Freq();
|
|
}
|
|
break;
|
|
case 1:
|
|
uart_clk = HAL_RCC_GetSysClockFreq();
|
|
break;
|
|
case 2:
|
|
uart_clk = HSI_VALUE;
|
|
break;
|
|
case 3:
|
|
uart_clk = LSE_VALUE;
|
|
break;
|
|
}
|
|
#elif defined(STM32H7)
|
|
uint32_t csel;
|
|
if (self->uart_id == 1 || self->uart_id == 6) {
|
|
csel = RCC->D2CCIP2R >> 3;
|
|
} else {
|
|
csel = RCC->D2CCIP2R;
|
|
}
|
|
switch (csel & 3) {
|
|
case 0:
|
|
if (self->uart_id == 1 || self->uart_id == 6) {
|
|
uart_clk = HAL_RCC_GetPCLK2Freq();
|
|
} else {
|
|
uart_clk = HAL_RCC_GetPCLK1Freq();
|
|
}
|
|
break;
|
|
case 3:
|
|
uart_clk = HSI_VALUE;
|
|
break;
|
|
case 4:
|
|
uart_clk = CSI_VALUE;
|
|
break;
|
|
case 5:
|
|
uart_clk = LSE_VALUE;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
#else
|
|
if (self->uart_id == 1
|
|
#if defined(USART6)
|
|
|| self->uart_id == 6
|
|
#endif
|
|
#if defined(UART9)
|
|
|| self->uart_id == 9
|
|
#endif
|
|
#if defined(UART10)
|
|
|| self->uart_id == 10
|
|
#endif
|
|
) {
|
|
uart_clk = HAL_RCC_GetPCLK2Freq();
|
|
} else {
|
|
uart_clk = HAL_RCC_GetPCLK1Freq();
|
|
}
|
|
#endif
|
|
|
|
// This formula assumes UART_OVERSAMPLING_16
|
|
uint32_t baudrate = uart_clk / self->uartx->BRR;
|
|
|
|
return baudrate;
|
|
}
|
|
|
|
mp_uint_t uart_rx_any(pyb_uart_obj_t *self) {
|
|
int buffer_bytes = self->read_buf_head - self->read_buf_tail;
|
|
if (buffer_bytes < 0) {
|
|
return buffer_bytes + self->read_buf_len;
|
|
} else if (buffer_bytes > 0) {
|
|
return buffer_bytes;
|
|
} else {
|
|
return UART_RXNE_IS_SET(self->uartx) != 0;
|
|
}
|
|
}
|
|
|
|
// Waits at most timeout milliseconds for at least 1 char to become ready for
|
|
// reading (from buf or for direct reading).
|
|
// Returns true if something available, false if not.
|
|
bool uart_rx_wait(pyb_uart_obj_t *self, uint32_t timeout) {
|
|
uint32_t start = HAL_GetTick();
|
|
for (;;) {
|
|
if (self->read_buf_tail != self->read_buf_head || UART_RXNE_IS_SET(self->uartx)) {
|
|
return true; // have at least 1 char ready for reading
|
|
}
|
|
if (HAL_GetTick() - start >= timeout) {
|
|
return false; // timeout
|
|
}
|
|
MICROPY_EVENT_POLL_HOOK
|
|
}
|
|
}
|
|
|
|
// assumes there is a character available
|
|
int uart_rx_char(pyb_uart_obj_t *self) {
|
|
if (self->read_buf_tail != self->read_buf_head) {
|
|
// buffering via IRQ
|
|
int data;
|
|
if (self->char_width == CHAR_WIDTH_9BIT) {
|
|
data = ((uint16_t *)self->read_buf)[self->read_buf_tail];
|
|
} else {
|
|
data = self->read_buf[self->read_buf_tail];
|
|
}
|
|
self->read_buf_tail = (self->read_buf_tail + 1) % self->read_buf_len;
|
|
if (UART_RXNE_IS_SET(self->uartx)) {
|
|
// UART was stalled by flow ctrl: re-enable IRQ now we have room in buffer
|
|
UART_RXNE_IT_EN(self->uartx);
|
|
}
|
|
return data;
|
|
} else {
|
|
// no buffering
|
|
#if defined(STM32F0) || defined(STM32F7) || defined(STM32L0) || defined(STM32L4) || defined(STM32H7) || defined(STM32WB)
|
|
int data = self->uartx->RDR & self->char_mask;
|
|
self->uartx->ICR = USART_ICR_ORECF; // clear ORE if it was set
|
|
return data;
|
|
#else
|
|
return self->uartx->DR & self->char_mask;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
// Waits at most timeout milliseconds for TX register to become empty.
|
|
// Returns true if can write, false if can't.
|
|
bool uart_tx_wait(pyb_uart_obj_t *self, uint32_t timeout) {
|
|
uint32_t start = HAL_GetTick();
|
|
for (;;) {
|
|
if (uart_tx_avail(self)) {
|
|
return true; // tx register is empty
|
|
}
|
|
if (HAL_GetTick() - start >= timeout) {
|
|
return false; // timeout
|
|
}
|
|
MICROPY_EVENT_POLL_HOOK
|
|
}
|
|
}
|
|
|
|
// Waits at most timeout milliseconds for UART flag to be set.
|
|
// Returns true if flag is/was set, false on timeout.
|
|
STATIC bool uart_wait_flag_set(pyb_uart_obj_t *self, uint32_t flag, uint32_t timeout) {
|
|
// Note: we don't use WFI to idle in this loop because UART tx doesn't generate
|
|
// an interrupt and the flag can be set quickly if the baudrate is large.
|
|
uint32_t start = HAL_GetTick();
|
|
for (;;) {
|
|
#if defined(STM32F4)
|
|
if (self->uartx->SR & flag) {
|
|
return true;
|
|
}
|
|
#else
|
|
if (self->uartx->ISR & flag) {
|
|
return true;
|
|
}
|
|
#endif
|
|
if (timeout == 0 || HAL_GetTick() - start >= timeout) {
|
|
return false; // timeout
|
|
}
|
|
}
|
|
}
|
|
|
|
// src - a pointer to the data to send (16-bit aligned for 9-bit chars)
|
|
// num_chars - number of characters to send (9-bit chars count for 2 bytes from src)
|
|
// *errcode - returns 0 for success, MP_Exxx on error
|
|
// returns the number of characters sent (valid even if there was an error)
|
|
size_t uart_tx_data(pyb_uart_obj_t *self, const void *src_in, size_t num_chars, int *errcode) {
|
|
if (num_chars == 0) {
|
|
*errcode = 0;
|
|
return 0;
|
|
}
|
|
|
|
uint32_t timeout;
|
|
if (self->uartx->CR3 & USART_CR3_CTSE) {
|
|
// CTS can hold off transmission for an arbitrarily long time. Apply
|
|
// the overall timeout rather than the character timeout.
|
|
timeout = self->timeout;
|
|
} else {
|
|
// The timeout specified here is for waiting for the TX data register to
|
|
// become empty (ie between chars), as well as for the final char to be
|
|
// completely transferred. The default value for timeout_char is long
|
|
// enough for 1 char, but we need to double it to wait for the last char
|
|
// to be transferred to the data register, and then to be transmitted.
|
|
timeout = 2 * self->timeout_char;
|
|
}
|
|
|
|
const uint8_t *src = (const uint8_t *)src_in;
|
|
size_t num_tx = 0;
|
|
USART_TypeDef *uart = self->uartx;
|
|
|
|
while (num_tx < num_chars) {
|
|
if (!uart_wait_flag_set(self, UART_FLAG_TXE, timeout)) {
|
|
*errcode = MP_ETIMEDOUT;
|
|
return num_tx;
|
|
}
|
|
uint32_t data;
|
|
if (self->char_width == CHAR_WIDTH_9BIT) {
|
|
data = *((uint16_t *)src) & 0x1ff;
|
|
src += 2;
|
|
} else {
|
|
data = *src++;
|
|
}
|
|
#if defined(STM32F4)
|
|
uart->DR = data;
|
|
#else
|
|
uart->TDR = data;
|
|
#endif
|
|
++num_tx;
|
|
}
|
|
|
|
// wait for the UART frame to complete
|
|
if (!uart_wait_flag_set(self, UART_FLAG_TC, timeout)) {
|
|
*errcode = MP_ETIMEDOUT;
|
|
return num_tx;
|
|
}
|
|
|
|
*errcode = 0;
|
|
return num_tx;
|
|
}
|
|
|
|
void uart_tx_strn(pyb_uart_obj_t *uart_obj, const char *str, uint len) {
|
|
int errcode;
|
|
uart_tx_data(uart_obj, str, len, &errcode);
|
|
}
|
|
|
|
// this IRQ handler is set up to handle RXNE interrupts only
|
|
void uart_irq_handler(mp_uint_t uart_id) {
|
|
// get the uart object
|
|
pyb_uart_obj_t *self = MP_STATE_PORT(pyb_uart_obj_all)[uart_id - 1];
|
|
|
|
if (self == NULL) {
|
|
// UART object has not been set, so we can't do anything, not
|
|
// even disable the IRQ. This should never happen.
|
|
return;
|
|
}
|
|
|
|
if (UART_RXNE_IS_SET(self->uartx)) {
|
|
if (self->read_buf_len != 0) {
|
|
uint16_t next_head = (self->read_buf_head + 1) % self->read_buf_len;
|
|
if (next_head != self->read_buf_tail) {
|
|
// only read data if room in buf
|
|
#if defined(STM32F0) || defined(STM32F7) || defined(STM32L0) || defined(STM32L4) || defined(STM32H7) || defined(STM32WB)
|
|
int data = self->uartx->RDR; // clears UART_FLAG_RXNE
|
|
self->uartx->ICR = USART_ICR_ORECF; // clear ORE if it was set
|
|
#else
|
|
int data = self->uartx->DR; // clears UART_FLAG_RXNE
|
|
#endif
|
|
data &= self->char_mask;
|
|
if (self->attached_to_repl && data == mp_interrupt_char) {
|
|
// Handle interrupt coming in on a UART REPL
|
|
pendsv_kbd_intr();
|
|
} else {
|
|
if (self->char_width == CHAR_WIDTH_9BIT) {
|
|
((uint16_t *)self->read_buf)[self->read_buf_head] = data;
|
|
} else {
|
|
self->read_buf[self->read_buf_head] = data;
|
|
}
|
|
self->read_buf_head = next_head;
|
|
}
|
|
} else { // No room: leave char in buf, disable interrupt
|
|
UART_RXNE_IT_DIS(self->uartx);
|
|
}
|
|
}
|
|
}
|
|
// If RXNE is clear but ORE set then clear the ORE flag (it's tied to RXNE IRQ)
|
|
#if defined(STM32F4)
|
|
else if (self->uartx->SR & USART_SR_ORE) {
|
|
(void)self->uartx->DR;
|
|
}
|
|
#else
|
|
else if (self->uartx->ISR & USART_ISR_ORE) {
|
|
self->uartx->ICR = USART_ICR_ORECF;
|
|
}
|
|
#endif
|
|
|
|
// Set user IRQ flags
|
|
self->mp_irq_flags = 0;
|
|
#if defined(STM32F4)
|
|
if (self->uartx->SR & USART_SR_IDLE) {
|
|
(void)self->uartx->SR;
|
|
(void)self->uartx->DR;
|
|
self->mp_irq_flags |= UART_FLAG_IDLE;
|
|
}
|
|
#else
|
|
if (self->uartx->ISR & USART_ISR_IDLE) {
|
|
self->uartx->ICR = USART_ICR_IDLECF;
|
|
self->mp_irq_flags |= UART_FLAG_IDLE;
|
|
}
|
|
#endif
|
|
|
|
// Check the flags to see if the user handler should be called
|
|
if (self->mp_irq_trigger & self->mp_irq_flags) {
|
|
mp_irq_handler(self->mp_irq_obj);
|
|
}
|
|
}
|