405 lines
16 KiB
C
405 lines
16 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) 2021 Scott Shawcroft for Adafruit Industries
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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/busio/UART.h"
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#include "mpconfigport.h"
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#include "lib/utils/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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#include "supervisor/shared/translate.h"
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#include "supervisor/shared/tick.h"
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#define UART_DEBUG(...) (void)0
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// #define UART_DEBUG(...) mp_printf(&mp_plat_print __VA_OPT__(,) __VA_ARGS__)
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// Do-nothing callback needed so that usart_async code will enable rx interrupts.
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// See comment below re usart_async_register_callback()
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// static void usart_async_rxc_callback(const struct usart_async_descriptor *const descr) {
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// // Nothing needs to be done by us.
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// }
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#define NO_PIN 0xff
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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, const mcu_pin_obj_t * rx,
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const mcu_pin_obj_t * rts, const mcu_pin_obj_t * cts,
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const mcu_pin_obj_t * rs485_dir, bool rs485_invert,
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uint32_t baudrate, uint8_t bits, busio_uart_parity_t parity, uint8_t stop,
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mp_float_t timeout, uint16_t receiver_buffer_size, byte* receiver_buffer,
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bool sigint_enabled) {
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mp_raise_NotImplementedError(translate("UART not yet supported"));
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// Sercom* sercom = NULL;
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// uint8_t sercom_index = 255; // Unset index
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// uint32_t rx_pinmux = 0;
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// uint8_t rx_pad = 255; // Unset pad
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// uint32_t tx_pinmux = 0;
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// uint8_t tx_pad = 255; // Unset pad
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// if ((rts != NULL) || (cts != NULL) || (rs485_dir != NULL) || (rs485_invert)) {
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// mp_raise_ValueError(translate("RTS/CTS/RS485 Not yet supported on this device"));
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// }
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// if (bits > 8) {
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// mp_raise_NotImplementedError(translate("bytes > 8 bits not supported"));
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// }
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// bool have_tx = tx != NULL;
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// bool have_rx = rx != NULL;
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// if (!have_tx && !have_rx) {
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// mp_raise_ValueError(translate("tx and rx cannot both be None"));
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// }
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// self->baudrate = baudrate;
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// self->character_bits = bits;
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// self->timeout_ms = timeout * 1000;
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// // This assignment is only here because the usart_async routines take a *const argument.
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// struct usart_async_descriptor * const usart_desc_p = (struct usart_async_descriptor * const) &self->usart_desc;
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// for (int i = 0; i < NUM_SERCOMS_PER_PIN; i++) {
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// Sercom* potential_sercom = NULL;
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// if (have_tx) {
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// sercom_index = tx->sercom[i].index;
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// if (sercom_index >= SERCOM_INST_NUM) {
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// continue;
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// }
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// potential_sercom = sercom_insts[sercom_index];
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// #ifdef SAMD21
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// if (potential_sercom->USART.CTRLA.bit.ENABLE != 0 ||
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// !(tx->sercom[i].pad == 0 ||
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// tx->sercom[i].pad == 2)) {
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// continue;
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// }
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// #endif
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// #ifdef SAM_D5X_E5X
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// if (potential_sercom->USART.CTRLA.bit.ENABLE != 0 ||
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// !(tx->sercom[i].pad == 0)) {
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// continue;
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// }
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// #endif
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// tx_pinmux = PINMUX(tx->number, (i == 0) ? MUX_C : MUX_D);
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// tx_pad = tx->sercom[i].pad;
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// if (rx == NULL) {
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// sercom = potential_sercom;
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// break;
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// }
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// }
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// for (int j = 0; j < NUM_SERCOMS_PER_PIN; j++) {
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// if (((!have_tx && rx->sercom[j].index < SERCOM_INST_NUM &&
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// sercom_insts[rx->sercom[j].index]->USART.CTRLA.bit.ENABLE == 0) ||
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// sercom_index == rx->sercom[j].index) &&
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// rx->sercom[j].pad != tx_pad) {
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// rx_pinmux = PINMUX(rx->number, (j == 0) ? MUX_C : MUX_D);
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// rx_pad = rx->sercom[j].pad;
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// sercom = sercom_insts[rx->sercom[j].index];
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// sercom_index = rx->sercom[j].index;
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// break;
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// }
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// }
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// if (sercom != NULL) {
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// break;
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// }
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// }
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// if (sercom == NULL) {
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// mp_raise_ValueError(translate("Invalid pins"));
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// }
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// if (!have_tx) {
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// tx_pad = 0;
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// if (rx_pad == 0) {
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// tx_pad = 2;
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// }
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// }
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// if (!have_rx) {
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// rx_pad = (tx_pad + 1) % 4;
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// }
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// // Set up clocks on SERCOM.
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// samd_peripherals_sercom_clock_init(sercom, sercom_index);
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// if (rx && receiver_buffer_size > 0) {
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// self->buffer_length = receiver_buffer_size;
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// // Initially allocate the UART's buffer in the long-lived part of the
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// // heap. UARTs are generally long-lived objects, but the "make long-
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// // lived" machinery is incapable of moving internal pointers like
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// // self->buffer, so do it manually. (However, as long as internal
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// // pointers like this are NOT moved, allocating the buffer
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// // in the long-lived pool is not strictly necessary)
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// self->buffer = (uint8_t *) gc_alloc(self->buffer_length * sizeof(uint8_t), false, true);
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// if (self->buffer == NULL) {
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// common_hal_busio_uart_deinit(self);
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// mp_raise_msg_varg(&mp_type_MemoryError, translate("Failed to allocate RX buffer of %d bytes"), self->buffer_length * sizeof(uint8_t));
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// }
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// } else {
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// self->buffer_length = 0;
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// self->buffer = NULL;
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// }
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// if (usart_async_init(usart_desc_p, sercom, self->buffer, self->buffer_length, NULL) != ERR_NONE) {
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// mp_raise_ValueError(translate("Could not initialize UART"));
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// }
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// // usart_async_init() sets a number of defaults based on a prototypical SERCOM
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// // which don't necessarily match what we need. After calling it, set the values
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// // specific to this instantiation of UART.
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// // Set pads computed for this SERCOM.
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// // TXPO:
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// // 0x0: TX pad 0; no RTS/CTS
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// // 0x1: TX pad 2; no RTS/CTS
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// // 0x2: TX pad 0; RTS: pad 2, CTS: pad 3 (not used by us right now)
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// // So divide by 2 to map pad to value.
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// // RXPO:
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// // 0x0: RX pad 0
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// // 0x1: RX pad 1
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// // 0x2: RX pad 2
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// // 0x3: RX pad 3
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// // Doing a group mask and set of the registers saves 60 bytes over setting the bitfields individually.
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// sercom->USART.CTRLA.reg &= ~(SERCOM_USART_CTRLA_TXPO_Msk |
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// SERCOM_USART_CTRLA_RXPO_Msk |
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// SERCOM_USART_CTRLA_FORM_Msk);
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// sercom->USART.CTRLA.reg |= SERCOM_USART_CTRLA_TXPO(tx_pad / 2) |
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// SERCOM_USART_CTRLA_RXPO(rx_pad) |
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// (parity == BUSIO_UART_PARITY_NONE ? 0 : SERCOM_USART_CTRLA_FORM(1));
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// // Enable tx and/or rx based on whether the pins were specified.
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// // CHSIZE is 0 for 8 bits, 5, 6, 7 for 5, 6, 7 bits. 1 for 9 bits, but we don't support that.
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// sercom->USART.CTRLB.reg &= ~(SERCOM_USART_CTRLB_TXEN |
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// SERCOM_USART_CTRLB_RXEN |
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// SERCOM_USART_CTRLB_PMODE |
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// SERCOM_USART_CTRLB_SBMODE |
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// SERCOM_USART_CTRLB_CHSIZE_Msk);
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// sercom->USART.CTRLB.reg |= (have_tx ? SERCOM_USART_CTRLB_TXEN : 0) |
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// (have_rx ? SERCOM_USART_CTRLB_RXEN : 0) |
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// (parity == BUSIO_UART_PARITY_ODD ? SERCOM_USART_CTRLB_PMODE : 0) |
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// (stop > 1 ? SERCOM_USART_CTRLB_SBMODE : 0) |
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// SERCOM_USART_CTRLB_CHSIZE(bits % 8);
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// // Set baud rate
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// common_hal_busio_uart_set_baudrate(self, baudrate);
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// // Turn on rx interrupt handling. The UART async driver has its own set of internal callbacks,
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// // which are set up by uart_async_init(). These in turn can call user-specified callbacks.
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// // In fact, the actual interrupts are not enabled unless we set up a user-specified callback.
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// // This is confusing. It's explained in the Atmel START User Guide -> Implementation Description ->
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// // Different read function behavior in some asynchronous drivers. As of this writing:
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// // http://start.atmel.com/static/help/index.html?GUID-79201A5A-226F-4FBB-B0B8-AB0BE0554836
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// // Look at the ASFv4 code example for async USART.
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// usart_async_register_callback(usart_desc_p, USART_ASYNC_RXC_CB, usart_async_rxc_callback);
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// if (have_tx) {
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// gpio_set_pin_direction(tx->number, GPIO_DIRECTION_OUT);
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// gpio_set_pin_pull_mode(tx->number, GPIO_PULL_OFF);
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// gpio_set_pin_function(tx->number, tx_pinmux);
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// self->tx_pin = tx->number;
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// claim_pin(tx);
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// } else {
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// self->tx_pin = NO_PIN;
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// }
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// if (have_rx) {
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// gpio_set_pin_direction(rx->number, GPIO_DIRECTION_IN);
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// gpio_set_pin_pull_mode(rx->number, GPIO_PULL_OFF);
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// gpio_set_pin_function(rx->number, rx_pinmux);
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// self->rx_pin = rx->number;
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// claim_pin(rx);
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// } else {
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// self->rx_pin = NO_PIN;
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// }
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// usart_async_enable(usart_desc_p);
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}
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bool common_hal_busio_uart_deinited(busio_uart_obj_t *self) {
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return self->rx_pin == NO_PIN && self->tx_pin == NO_PIN;
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}
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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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// This assignment is only here because the usart_async routines take a *const argument.
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// struct usart_async_descriptor * const usart_desc_p = (struct usart_async_descriptor * const) &self->usart_desc;
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// usart_async_disable(usart_desc_p);
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// usart_async_deinit(usart_desc_p);
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reset_pin_number(self->rx_pin);
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reset_pin_number(self->tx_pin);
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self->rx_pin = NO_PIN;
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self->tx_pin = NO_PIN;
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}
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// Read characters.
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size_t common_hal_busio_uart_read(busio_uart_obj_t *self, uint8_t *data, size_t len, int *errcode) {
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if (self->rx_pin == NO_PIN) {
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mp_raise_ValueError(translate("No RX pin"));
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}
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// This assignment is only here because the usart_async routines take a *const argument.
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// struct usart_async_descriptor * const usart_desc_p = (struct usart_async_descriptor * const) &self->usart_desc;
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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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// struct io_descriptor *io;
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// usart_async_get_io_descriptor(usart_desc_p, &io);
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size_t total_read = 0;
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// uint64_t start_ticks = supervisor_ticks_ms64();
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// // Busy-wait until timeout or until we've read enough chars.
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// while (supervisor_ticks_ms64() - start_ticks <= self->timeout_ms) {
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// // Read as many chars as we can right now, up to len.
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// size_t num_read = io_read(io, data, len);
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// // Advance pointer in data buffer, and decrease how many chars left to read.
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// data += num_read;
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// len -= num_read;
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// total_read += num_read;
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// if (len == 0) {
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// // Don't need to read any more: data buf is full.
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// break;
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// }
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// if (num_read > 0) {
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// // Reset the timeout on every character read.
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// start_ticks = supervisor_ticks_ms64();
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// }
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// RUN_BACKGROUND_TASKS;
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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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// break;
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// }
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// // If we are zero timeout, make sure we don't loop again (in the event
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// // we read in under 1ms)
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// if (self->timeout_ms == 0) {
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// break;
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// }
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// }
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// if (total_read == 0) {
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// *errcode = EAGAIN;
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// return MP_STREAM_ERROR;
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// }
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return total_read;
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}
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// Write characters.
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size_t common_hal_busio_uart_write(busio_uart_obj_t *self, const uint8_t *data, size_t len, int *errcode) {
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if (self->tx_pin == NO_PIN) {
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mp_raise_ValueError(translate("No TX pin"));
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}
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// This assignment is only here because the usart_async routines take a *const argument.
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// struct usart_async_descriptor * const usart_desc_p = (struct usart_async_descriptor * const) &self->usart_desc;
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// struct io_descriptor *io;
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// usart_async_get_io_descriptor(usart_desc_p, &io);
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// // Start writing characters. This is non-blocking and will
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// // return immediately after setting up the write.
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// if (io_write(io, data, len) < 0) {
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// *errcode = MP_EAGAIN;
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// return MP_STREAM_ERROR;
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// }
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// // Busy-wait until all characters transmitted.
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// struct usart_async_status async_status;
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// while (true) {
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// usart_async_get_status(usart_desc_p, &async_status);
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// if (async_status.txcnt >= len) {
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// break;
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// }
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// RUN_BACKGROUND_TASKS;
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// }
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return len;
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}
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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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void common_hal_busio_uart_set_baudrate(busio_uart_obj_t *self, uint32_t baudrate) {
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// This assignment is only here because the usart_async routines take a *const argument.
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// struct usart_async_descriptor * const usart_desc_p = (struct usart_async_descriptor * const) &self->usart_desc;
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// usart_async_set_baud_rate(usart_desc_p,
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// // Samples and ARITHMETIC vs FRACTIONAL must correspond to USART_SAMPR in
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// // hpl_sercom_config.h.
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// _usart_async_calculate_baud_rate(baudrate, // e.g. 9600 baud
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// PROTOTYPE_SERCOM_USART_ASYNC_CLOCK_FREQUENCY,
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// 16, // samples
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// USART_BAUDRATE_ASYNCH_ARITHMETIC,
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// 0 // fraction - not used for ARITHMETIC
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// ));
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self->baudrate = baudrate;
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}
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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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void common_hal_busio_uart_set_timeout(busio_uart_obj_t *self, mp_float_t timeout) {
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self->timeout_ms = timeout * 1000;
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}
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uint32_t common_hal_busio_uart_rx_characters_available(busio_uart_obj_t *self) {
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// This assignment is only here because the usart_async routines take a *const argument.
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// struct usart_async_descriptor * const usart_desc_p = (struct usart_async_descriptor * const) &self->usart_desc;
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// struct usart_async_status async_status;
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// usart_async_get_status(usart_desc_p, &async_status);
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// return async_status.rxcnt;
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return 0;
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}
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void common_hal_busio_uart_clear_rx_buffer(busio_uart_obj_t *self) {
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// This assignment is only here because the usart_async routines take a *const argument.
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// struct usart_async_descriptor * const usart_desc_p = (struct usart_async_descriptor * const) &self->usart_desc;
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// usart_async_flush_rx_buffer(usart_desc_p);
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}
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// True if there are no characters still to be written.
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bool common_hal_busio_uart_ready_to_tx(busio_uart_obj_t *self) {
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if (self->tx_pin == NO_PIN) {
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return false;
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}
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return false;
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// // This assignment is only here because the usart_async routines take a *const argument.
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// struct usart_async_descriptor * const usart_desc_p = (struct usart_async_descriptor * const) &self->usart_desc;
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// struct usart_async_status async_status;
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// usart_async_get_status(usart_desc_p, &async_status);
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// return !(async_status.flags & USART_ASYNC_STATUS_BUSY);
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}
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