373 lines
12 KiB
C
373 lines
12 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) 2018 Ha Thach 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 "lib/utils/interrupt_char.h"
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#include "py/mpconfig.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 "nrfx_uarte.h"
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#include "nrf_gpio.h"
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#include <string.h>
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// expression to examine, and return value in case of failing
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#define _VERIFY_ERR(_exp) \
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do {\
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uint32_t _err = (_exp);\
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if (NRFX_SUCCESS != _err ) {\
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mp_raise_msg_varg(&mp_type_RuntimeError, translate("error = 0x%08lX"), _err);\
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}\
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}while(0)
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static nrfx_uarte_t nrfx_uartes[] = {
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#if NRFX_CHECK(NRFX_UARTE0_ENABLED)
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NRFX_UARTE_INSTANCE(0),
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#endif
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#if NRFX_CHECK(NRFX_UARTE1_ENABLED)
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NRFX_UARTE_INSTANCE(1),
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#endif
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};
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static uint32_t get_nrf_baud (uint32_t baudrate) {
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static const struct {
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const uint32_t boundary;
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nrf_uarte_baudrate_t uarte_baudraute;
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} baudrate_map[] = {
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{ 1200, NRF_UARTE_BAUDRATE_1200 },
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{ 2400, NRF_UARTE_BAUDRATE_2400 },
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{ 4800, NRF_UARTE_BAUDRATE_4800 },
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{ 9600, NRF_UARTE_BAUDRATE_9600 },
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{ 14400, NRF_UARTE_BAUDRATE_14400 },
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{ 19200, NRF_UARTE_BAUDRATE_19200 },
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{ 28800, NRF_UARTE_BAUDRATE_28800 },
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{ 31250, NRF_UARTE_BAUDRATE_31250 },
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{ 38400, NRF_UARTE_BAUDRATE_38400 },
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{ 56000, NRF_UARTE_BAUDRATE_56000 },
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{ 57600, NRF_UARTE_BAUDRATE_57600 },
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{ 76800, NRF_UARTE_BAUDRATE_76800 },
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{ 115200, NRF_UARTE_BAUDRATE_115200 },
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{ 230400, NRF_UARTE_BAUDRATE_230400 },
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{ 250000, NRF_UARTE_BAUDRATE_250000 },
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{ 460800, NRF_UARTE_BAUDRATE_460800 },
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{ 921600, NRF_UARTE_BAUDRATE_921600 },
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{ 0, NRF_UARTE_BAUDRATE_1000000 },
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};
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size_t i = 0;
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uint32_t boundary;
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do {
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boundary = baudrate_map[i].boundary;
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if (baudrate <= boundary || boundary == 0) {
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return baudrate_map[i].uarte_baudraute;
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}
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i++;
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} while (true);
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}
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static void uart_callback_irq (const nrfx_uarte_event_t * event, void * context) {
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busio_uart_obj_t* self = (busio_uart_obj_t*) context;
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switch ( event->type ) {
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case NRFX_UARTE_EVT_RX_DONE:
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if (ringbuf_num_empty(&self->ringbuf) >= event->data.rxtx.bytes) {
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ringbuf_put_n(&self->ringbuf, event->data.rxtx.p_data, event->data.rxtx.bytes);
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// keep receiving
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(void) nrfx_uarte_rx(self->uarte, &self->rx_char, 1);
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} else {
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// receive buffer full, suspend
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self->rx_paused = true;
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nrf_gpio_pin_write(self->rts_pin_number, true);
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}
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break;
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case NRFX_UARTE_EVT_TX_DONE:
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// nothing to do
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break;
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case NRFX_UARTE_EVT_ERROR:
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// Possible Error source is Overrun, Parity, Framing, Break
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// uint32_t errsrc = event->data.error.error_mask;
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ringbuf_put_n(&self->ringbuf, event->data.error.rxtx.p_data, event->data.error.rxtx.bytes);
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// Keep receiving
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(void) nrfx_uarte_rx(self->uarte, &self->rx_char, 1);
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break;
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default:
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break;
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}
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}
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void uart_reset(void) {
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for (size_t i = 0 ; i < MP_ARRAY_SIZE(nrfx_uartes); i++) {
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nrfx_uarte_uninit(&nrfx_uartes[i]);
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}
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}
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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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if (bits != 8) {
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mp_raise_ValueError(translate("Invalid word/bit length"));
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}
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if ((rs485_dir != NULL) || (rs485_invert)) {
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mp_raise_ValueError(translate("RS485 Not yet supported on this device"));
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}
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// Find a free UART peripheral.
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self->uarte = NULL;
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for (size_t i = 0 ; i < MP_ARRAY_SIZE(nrfx_uartes); i++) {
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if ((nrfx_uartes[i].p_reg->ENABLE & UARTE_ENABLE_ENABLE_Msk) == 0) {
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self->uarte = &nrfx_uartes[i];
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break;
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}
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}
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if (self->uarte == NULL) {
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mp_raise_ValueError(translate("All UART peripherals are in use"));
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}
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if ( (tx == NULL) && (rx == NULL) ) {
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mp_raise_ValueError(translate("tx and rx cannot both be None"));
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}
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if ( receiver_buffer_size == 0 ) {
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mp_raise_ValueError(translate("Invalid buffer size"));
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}
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if ( parity == BUSIO_UART_PARITY_ODD ) {
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mp_raise_ValueError(translate("Odd parity is not supported"));
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}
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bool hwfc = rts != NULL || cts != NULL;
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nrfx_uarte_config_t config = {
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.pseltxd = (tx == NULL) ? NRF_UARTE_PSEL_DISCONNECTED : tx->number,
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.pselrxd = (rx == NULL) ? NRF_UARTE_PSEL_DISCONNECTED : rx->number,
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.pselcts = (cts == NULL) ? NRF_UARTE_PSEL_DISCONNECTED : cts->number,
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.pselrts = (rts == NULL) ? NRF_UARTE_PSEL_DISCONNECTED : rts->number,
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.p_context = self,
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.baudrate = get_nrf_baud(baudrate),
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.interrupt_priority = 7,
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.hal_cfg = {
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.hwfc = hwfc ? NRF_UARTE_HWFC_ENABLED : NRF_UARTE_HWFC_DISABLED,
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.parity = (parity == BUSIO_UART_PARITY_NONE) ? NRF_UARTE_PARITY_EXCLUDED : NRF_UARTE_PARITY_INCLUDED
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}
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};
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_VERIFY_ERR(nrfx_uarte_init(self->uarte, &config, uart_callback_irq));
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// Init buffer for rx
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if ( rx != NULL ) {
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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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// (This is a macro.)
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if (!ringbuf_alloc(&self->ringbuf, receiver_buffer_size, true)) {
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nrfx_uarte_uninit(self->uarte);
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mp_raise_msg(&mp_type_MemoryError, translate("Failed to allocate RX buffer"));
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}
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self->rx_pin_number = rx->number;
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claim_pin(rx);
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}
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if ( tx != NULL ) {
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self->tx_pin_number = tx->number;
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claim_pin(tx);
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} else {
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self->tx_pin_number = NO_PIN;
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}
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if ( rts != NULL ) {
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self->rts_pin_number = rts->number;
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claim_pin(rts);
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} else {
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self->rts_pin_number = NO_PIN;
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}
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if ( cts != NULL ) {
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self->cts_pin_number = cts->number;
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claim_pin(cts);
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} else {
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self->cts_pin_number = NO_PIN;
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}
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self->baudrate = baudrate;
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self->timeout_ms = timeout * 1000;
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self->rx_paused = false;
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// Initial wait for incoming byte
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_VERIFY_ERR(nrfx_uarte_rx(self->uarte, &self->rx_char, 1));
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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_number == 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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nrfx_uarte_uninit(self->uarte);
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reset_pin_number(self->tx_pin_number);
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reset_pin_number(self->rx_pin_number);
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reset_pin_number(self->rts_pin_number);
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reset_pin_number(self->cts_pin_number);
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self->tx_pin_number = NO_PIN;
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self->rx_pin_number = NO_PIN;
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self->rts_pin_number = NO_PIN;
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self->cts_pin_number = NO_PIN;
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ringbuf_free(&self->ringbuf);
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}
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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 ( nrf_uarte_rx_pin_get(self->uarte->p_reg) == NRF_UARTE_PSEL_DISCONNECTED ) {
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mp_raise_ValueError(translate("No RX pin"));
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}
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uint64_t start_ticks = supervisor_ticks_ms64();
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// check removed to reduce code size
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/*
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if (len > ringbuf_capacity(&self->ringbuf)) {
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mp_raise_ValueError(translate("Reading >receiver_buffer_size bytes is not supported"));
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}
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*/
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// Wait for all bytes received or timeout
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while ( (ringbuf_num_filled(&self->ringbuf) < len) && (supervisor_ticks_ms64() - start_ticks < self->timeout_ms) ) {
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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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return 0;
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}
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}
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// prevent conflict with uart irq
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NVIC_DisableIRQ(nrfx_get_irq_number(self->uarte->p_reg));
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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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// restart reader, if stopped
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if (self->rx_paused) {
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// the character that did not fit in ringbuf is in rx_char
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ringbuf_put_n(&self->ringbuf, &self->rx_char, 1);
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// keep receiving
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(void) nrfx_uarte_rx(self->uarte, &self->rx_char, 1);
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nrf_gpio_pin_write(self->rts_pin_number, false);
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self->rx_paused = false;
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}
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NVIC_EnableIRQ(nrfx_get_irq_number(self->uarte->p_reg));
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return rx_bytes;
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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 ( nrf_uarte_tx_pin_get(self->uarte->p_reg) == NRF_UARTE_PSEL_DISCONNECTED ) {
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mp_raise_ValueError(translate("No TX pin"));
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}
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if ( len == 0 ) return 0;
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// EasyDMA can only access SRAM
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uint8_t * tx_buf = (uint8_t*) data;
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if ( !nrfx_is_in_ram(data) ) {
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// TODO: If this is not too big, we could allocate it on the stack.
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tx_buf = (uint8_t *) gc_alloc(len, false, false);
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memcpy(tx_buf, data, len);
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}
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(*errcode) = nrfx_uarte_tx(self->uarte, tx_buf, len);
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_VERIFY_ERR(*errcode);
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(*errcode) = 0;
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// Wait for write to complete.
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while ( nrfx_uarte_tx_in_progress(self->uarte) ) {
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RUN_BACKGROUND_TASKS;
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}
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if ( !nrfx_is_in_ram(data) ) {
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gc_free(tx_buf);
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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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self->baudrate = baudrate;
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nrf_uarte_baudrate_set(self->uarte->p_reg, get_nrf_baud(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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return ringbuf_num_filled(&self->ringbuf);
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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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// prevent conflict with uart irq
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NVIC_DisableIRQ(nrfx_get_irq_number(self->uarte->p_reg));
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ringbuf_clear(&self->ringbuf);
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NVIC_EnableIRQ(nrfx_get_irq_number(self->uarte->p_reg));
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}
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bool common_hal_busio_uart_ready_to_tx(busio_uart_obj_t *self) {
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return !nrfx_uarte_tx_in_progress(self->uarte);
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}
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