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circuitpython/ports/cxd56/common-hal/busio/UART.c

212 lines
6.4 KiB

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright 2019 Sony Semiconductor Solutions Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <string.h>
#include <unistd.h>
#include <termios.h>
#include <fcntl.h>
#include <sys/time.h>
#include <sys/select.h>
#include <sys/ioctl.h>
#include <nuttx/serial/tioctl.h>
#include <nuttx/fs/ioctl.h>
#include "py/mperrno.h"
#include "py/stream.h"
#include "py/runtime.h"
#include "shared-bindings/busio/UART.h"
typedef struct {
const char* devpath;
const mcu_pin_obj_t *tx;
const mcu_pin_obj_t *rx;
int fd;
} busio_uart_dev_t;
STATIC busio_uart_dev_t busio_uart_dev[] = {
{"/dev/ttyS2", &pin_UART2_TXD, &pin_UART2_RXD, -1},
};
void common_hal_busio_uart_construct(busio_uart_obj_t *self,
const mcu_pin_obj_t * tx, const mcu_pin_obj_t * rx,
const mcu_pin_obj_t * rts, const mcu_pin_obj_t * cts,
const mcu_pin_obj_t * rs485_dir, bool rs485_invert,
uint32_t baudrate, uint8_t bits, uart_parity_t parity, uint8_t stop,
mp_float_t timeout, uint16_t receiver_buffer_size) {
struct termios tio;
if ((rts != NULL) || (cts != NULL) || (rs485_dir != NULL) || (rs485_invert)) {
mp_raise_ValueError(translate("RTS/CTS/RS485 Not yet supported on this device"));
}
if (bits != 8) {
mp_raise_ValueError(translate("Could not initialize UART"));
}
if (parity != PARITY_NONE) {
mp_raise_ValueError(translate("Could not initialize UART"));
}
if (stop != 1) {
mp_raise_ValueError(translate("Could not initialize UART"));
}
self->number = -1;
for (int i = 0; i < MP_ARRAY_SIZE(busio_uart_dev); i++) {
if (tx->number == busio_uart_dev[i].tx->number &&
rx->number == busio_uart_dev[i].rx->number) {
self->number = i;
break;
}
}
if (self->number < 0) {
mp_raise_ValueError(translate("Invalid pins"));
}
if (busio_uart_dev[self->number].fd < 0) {
busio_uart_dev[self->number].fd = open(busio_uart_dev[self->number].devpath, O_RDWR);
if (busio_uart_dev[self->number].fd < 0) {
mp_raise_ValueError(translate("Could not initialize UART"));
}
}
ioctl(busio_uart_dev[self->number].fd, TCGETS, (long unsigned int)&tio);
tio.c_speed = baudrate;
ioctl(busio_uart_dev[self->number].fd, TCSETS, (long unsigned int)&tio);
ioctl(busio_uart_dev[self->number].fd, TCFLSH, (long unsigned int)NULL);
claim_pin(tx);
claim_pin(rx);
self->tx_pin = tx;
self->rx_pin = rx;
self->baudrate = baudrate;
self->timeout_us = timeout * 1000000;
}
void common_hal_busio_uart_deinit(busio_uart_obj_t *self) {
if (common_hal_busio_uart_deinited(self)) {
return;
}
close(busio_uart_dev[self->number].fd);
busio_uart_dev[self->number].fd = -1;
reset_pin_number(self->tx_pin->number);
reset_pin_number(self->rx_pin->number);
}
bool common_hal_busio_uart_deinited(busio_uart_obj_t *self) {
return busio_uart_dev[self->number].fd < 0;
}
size_t common_hal_busio_uart_read(busio_uart_obj_t *self, uint8_t *data, size_t len, int *errcode) {
fd_set rfds;
struct timeval tv;
int retval, bytes_read;
// make sure we want at least 1 char
if (len == 0) {
return 0;
}
FD_ZERO(&rfds);
FD_SET(busio_uart_dev[self->number].fd, &rfds);
tv.tv_sec = 0;
tv.tv_usec = self->timeout_us;
retval = select(busio_uart_dev[self->number].fd + 1, &rfds, NULL, NULL, &tv);
if (retval) {
bytes_read = read(busio_uart_dev[self->number].fd, data, len);
} else {
*errcode = EAGAIN;
return MP_STREAM_ERROR;
}
return bytes_read;
}
size_t common_hal_busio_uart_write(busio_uart_obj_t *self, const uint8_t *data, size_t len, int *errcode) {
int bytes_written = write(busio_uart_dev[self->number].fd, data, len);
if (bytes_written < 0) {
*errcode = MP_EAGAIN;
return MP_STREAM_ERROR;
}
return bytes_written;
}
uint32_t common_hal_busio_uart_get_baudrate(busio_uart_obj_t *self) {
return self->baudrate;
}
void common_hal_busio_uart_set_baudrate(busio_uart_obj_t *self, uint32_t baudrate) {
struct termios tio;
ioctl(busio_uart_dev[self->number].fd, TCGETS, (long unsigned int)&tio);
tio.c_speed = baudrate;
ioctl(busio_uart_dev[self->number].fd, TCSETS, (long unsigned int)&tio);
ioctl(busio_uart_dev[self->number].fd, TCFLSH, (long unsigned int)NULL);
}
mp_float_t common_hal_busio_uart_get_timeout(busio_uart_obj_t *self) {
return (mp_float_t) (self->timeout_us / 1000000.0f);
}
void common_hal_busio_uart_set_timeout(busio_uart_obj_t *self, mp_float_t timeout) {
self->timeout_us = timeout * 1000000;
}
uint32_t common_hal_busio_uart_rx_characters_available(busio_uart_obj_t *self) {
int count = 0;
ioctl(busio_uart_dev[self->number].fd, FIONREAD, (long unsigned int)&count);
return count;
}
void common_hal_busio_uart_clear_rx_buffer(busio_uart_obj_t *self) {
}
bool common_hal_busio_uart_ready_to_tx(busio_uart_obj_t *self) {
ioctl(busio_uart_dev[self->number].fd, TCFLSH, (long unsigned int)NULL);
return true;
}
void busio_uart_reset(void) {
for (int i = 0; i < MP_ARRAY_SIZE(busio_uart_dev); i++) {
if (busio_uart_dev[i].fd >= 0) {
close(busio_uart_dev[i].fd);
busio_uart_dev[i].fd = -1;
}
}
}