299 lines
9.8 KiB
C
299 lines
9.8 KiB
C
/*
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* This file is part of Adafruit for EFR32 project
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*
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* The MIT License (MIT)
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*
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* Copyright 2023 Silicon Laboratories Inc. www.silabs.com
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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 "shared-bindings/microcontroller/__init__.h"
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#include "shared-bindings/microcontroller/Pin.h"
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#include "shared-bindings/busio/UART.h"
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#include "mpconfigport.h"
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#include "shared/readline/readline.h"
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#include "shared/runtime/interrupt_char.h"
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#include "py/gc.h"
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#include "py/mperrno.h"
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#include "py/runtime.h"
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#include "py/stream.h"
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#define UARTDRV_USART_BUFFER_SIZE 6
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// Define RX and TX buffer queues
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DEFINE_BUF_QUEUE(UARTDRV_USART_BUFFER_SIZE, uartdrv_usart_rx_buffer);
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DEFINE_BUF_QUEUE(UARTDRV_USART_BUFFER_SIZE, uartdrv_usart_tx_buffer);
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STATIC UARTDRV_HandleData_t uartdrv_usart_handle;
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STATIC UARTDRV_InitUart_t uartdrv_usart_init;
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STATIC bool in_used = false;
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STATIC bool never_reset = false;
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busio_uart_obj_t *context;
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volatile Ecode_t errflag; // Used to restart read halts
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// Reset uart peripheral
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void uart_reset(void) {
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if ((!never_reset) && in_used) {
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if (UARTDRV_DeInit(&uartdrv_usart_handle) != ECODE_EMDRV_UARTDRV_OK) {
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mp_raise_ValueError(MP_ERROR_TEXT("UART Deinit fail"));
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}
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in_used = false;
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}
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}
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// Construct uart obj
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void common_hal_busio_uart_construct(busio_uart_obj_t *self,
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const mcu_pin_obj_t *tx,
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const mcu_pin_obj_t *rx,
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const mcu_pin_obj_t *rts,
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const mcu_pin_obj_t *cts,
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const mcu_pin_obj_t *rs485_dir,
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bool rs485_invert,
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uint32_t baudrate,
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uint8_t bits,
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busio_uart_parity_t parity,
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uint8_t stop,
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mp_float_t timeout,
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uint16_t receiver_buffer_size,
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byte *receiver_buffer,
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bool sigint_enabled) {
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if ((rts != NULL) || (cts != NULL) || (rs485_dir != NULL)
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|| (rs485_invert == true)) {
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mp_raise_NotImplementedError(MP_ERROR_TEXT("RS485"));
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}
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if ((tx != NULL) && (rx != NULL)) {
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if (tx->function_list[FN_USART0_TX] == 1
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&& tx->function_list[FN_USART0_RX] == 1) {
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self->handle = &uartdrv_usart_handle;
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self->baudrate = baudrate;
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self->tx = tx;
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self->rx = rx;
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self->sigint_enabled = sigint_enabled;
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self->timeout_ms = timeout * 1000;
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uartdrv_usart_init.port = USART0;
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uartdrv_usart_init.baudRate = baudrate;
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uartdrv_usart_init.txPort = tx->port;
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uartdrv_usart_init.rxPort = rx->port;
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uartdrv_usart_init.txPin = tx->number;
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uartdrv_usart_init.rxPin = rx->number;
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uartdrv_usart_init.uartNum = 0;
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uartdrv_usart_init.stopBits = (stop >= 2) ? usartStopbits2
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:usartStopbits1;
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uartdrv_usart_init.parity = (USART_Parity_TypeDef)parity;
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uartdrv_usart_init.oversampling = usartOVS4;
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uartdrv_usart_init.mvdis = false;
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uartdrv_usart_init.fcType = uartdrvFlowControlNone;
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uartdrv_usart_init.rxQueue = (UARTDRV_Buffer_FifoQueue_t *)
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&uartdrv_usart_rx_buffer;
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uartdrv_usart_init.txQueue = (UARTDRV_Buffer_FifoQueue_t *)
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&uartdrv_usart_tx_buffer;
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if (UARTDRV_InitUart(self->handle, &uartdrv_usart_init)
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!= ECODE_EMDRV_UARTDRV_OK) {
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mp_raise_RuntimeError(MP_ERROR_TEXT("UART init"));
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}
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common_hal_mcu_pin_claim(tx);
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common_hal_mcu_pin_claim(rx);
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in_used = true;
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// Use the provided buffer when given.
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if (receiver_buffer != NULL) {
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ringbuf_init(&self->ringbuf, receiver_buffer, receiver_buffer_size);
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} else {
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if (!ringbuf_alloc(&self->ringbuf, receiver_buffer_size)) {
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m_malloc_fail(receiver_buffer_size);
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}
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}
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errflag = ECODE_EMDRV_UARTDRV_OK;
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context = self;
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} else {
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mp_raise_ValueError(MP_ERROR_TEXT("Hardware in use, try alternative pins"));
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}
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} else {
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raise_ValueError_invalid_pins();
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}
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}
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// Never reset UART obj when reload
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void common_hal_busio_uart_never_reset(busio_uart_obj_t *self) {
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never_reset = true;
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common_hal_never_reset_pin(self->tx);
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common_hal_never_reset_pin(self->rx);
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return;
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}
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// Check Uart status, deinited or not
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bool common_hal_busio_uart_deinited(busio_uart_obj_t *self) {
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return self->handle == NULL;
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}
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// Deinit uart obj
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void common_hal_busio_uart_deinit(busio_uart_obj_t *self) {
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if (common_hal_busio_uart_deinited(self)) {
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return;
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}
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if (UARTDRV_DeInit(self->handle) != ECODE_EMDRV_UARTDRV_OK) {
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mp_raise_RuntimeError(MP_ERROR_TEXT("UART de-init"));
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}
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common_hal_reset_pin(self->rx);
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common_hal_reset_pin(self->tx);
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self->tx = NULL;
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self->rx = NULL;
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self->handle = NULL;
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in_used = false;
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}
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// Callback function for UARTDRV_Receive
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void UARTDRV_Receive_Callback(UARTDRV_Handle_t *handle,
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Ecode_t transferStatus,
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uint8_t *data,
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UARTDRV_Count_t transferCount) {
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(void)handle;
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(void)transferStatus;
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(void)data;
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(void)transferCount;
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taskENTER_CRITICAL();
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ringbuf_put_n(&context->ringbuf, &context->rx_char, 1);
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taskEXIT_CRITICAL();
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errflag = UARTDRV_Receive(context->handle, &context->rx_char, 1,
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(UARTDRV_Callback_t)UARTDRV_Receive_Callback);
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if (context->sigint_enabled) {
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if (context->rx_char == CHAR_CTRL_C) {
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common_hal_busio_uart_clear_rx_buffer(context);
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mp_sched_keyboard_interrupt();
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}
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}
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}
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// Read bytes. If nbytes is specified then read at most that many bytes.
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// Otherwise, read everything that arrives until the connection times out.
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// Providing the number of bytes expected is highly recommended because it will be faster.
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// If no bytes are read, return None.
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size_t common_hal_busio_uart_read(busio_uart_obj_t *self, uint8_t *data,
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size_t len, int *errcode) {
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uint64_t start_ticks = supervisor_ticks_ms64();
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if (len == 0) {
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// Nothing to read.
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return 0;
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}
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errflag = ECODE_EMDRV_UARTDRV_WAITING;
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// Wait for all bytes received or timeout, same as nrf
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while ((ringbuf_num_filled(&self->ringbuf) < len) &&
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(supervisor_ticks_ms64() - start_ticks < self->timeout_ms)) {
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RUN_BACKGROUND_TASKS;
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// restart if it failed in the callback
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if (errflag != ECODE_EMDRV_UARTDRV_OK) {
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errflag = UARTDRV_Receive(self->handle, &self->rx_char, 1,
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(UARTDRV_Callback_t)UARTDRV_Receive_Callback);
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}
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// Allow user to break out of a timeout with a KeyboardInterrupt.
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if (mp_hal_is_interrupted()) {
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return 0;
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}
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}
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taskENTER_CRITICAL();
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// Copy as much received data as available, up to len bytes.
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size_t rx_bytes = ringbuf_get_n(&self->ringbuf, data, len);
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taskEXIT_CRITICAL();
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if (rx_bytes == 0) {
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*errcode = EAGAIN;
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return MP_STREAM_ERROR;
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}
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return rx_bytes;
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}
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// Write the buffer of bytes to the bus.
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size_t common_hal_busio_uart_write(busio_uart_obj_t *self,
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const uint8_t *data,
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size_t len,
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int *errcode) {
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Ecode_t ret = UARTDRV_TransmitB(self->handle, (uint8_t *)data, len);
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if (ret != ECODE_EMDRV_UARTDRV_OK) {
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mp_raise_RuntimeError(MP_ERROR_TEXT("UART write"));
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}
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return len;
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}
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// Get uart baudrate value
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uint32_t common_hal_busio_uart_get_baudrate(busio_uart_obj_t *self) {
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return self->baudrate;
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}
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// Set uart baudrate value
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void common_hal_busio_uart_set_baudrate(busio_uart_obj_t *self,
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uint32_t baudrate) {
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// Don't reset if it's the same value
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if (baudrate == self->baudrate) {
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return;
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}
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uartdrv_usart_init.baudRate = baudrate;
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if (UARTDRV_InitUart(self->handle, &uartdrv_usart_init)
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!= ECODE_EMDRV_UARTDRV_OK) {
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mp_raise_RuntimeError(MP_ERROR_TEXT("UART re-init"));
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}
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}
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// Get timeout for receive
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mp_float_t common_hal_busio_uart_get_timeout(busio_uart_obj_t *self) {
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return (mp_float_t)(self->timeout_ms / 1000.0f);
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}
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// Set timeout for receive
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void common_hal_busio_uart_set_timeout(busio_uart_obj_t *self,
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mp_float_t timeout) {
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self->timeout_ms = timeout * 1000;
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}
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// Query characters available to read
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uint32_t common_hal_busio_uart_rx_characters_available(busio_uart_obj_t *self) {
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return ringbuf_num_filled(&self->ringbuf);
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}
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// Clear rx buffer
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void common_hal_busio_uart_clear_rx_buffer(busio_uart_obj_t *self) {
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taskENTER_CRITICAL();
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ringbuf_clear(&self->ringbuf);
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taskEXIT_CRITICAL();
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self->handle->rxQueue->head = 0;
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self->handle->rxQueue->tail = 0;
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self->handle->rxQueue->used = 0;
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}
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// Check uart bus ready to transmit or not
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bool common_hal_busio_uart_ready_to_tx(busio_uart_obj_t *self) {
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return UARTDRV_GetTransmitDepth(self->handle) == 0;
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}
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