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circuitpython/ports/esp8266/common-hal/busio/UART.c

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4.4 KiB

/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Damien P. George
*
* 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 "common-hal/microcontroller/__init__.h"
#include "shared-bindings/microcontroller/__init__.h"
#include "shared-bindings/busio/UART.h"
#include "ets_sys.h"
#include "uart.h"
#include "py/nlr.h"
// UartDev is defined and initialized in rom code.
extern UartDevice UartDev;
void common_hal_busio_uart_construct(busio_uart_obj_t *self,
const mcu_pin_obj_t * tx, const mcu_pin_obj_t * rx, uint32_t baudrate,
uint8_t bits, uart_parity_t parity, uint8_t stop, uint32_t timeout,
uint8_t receiver_buffer_size) {
if (rx != mp_const_none || tx != &pin_GPIO2) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "Only tx supported on UART1 (GPIO2)."));
}
// set baudrate
UartDev.baut_rate = baudrate;
self->baudrate = baudrate;
// set data bits
switch (bits) {
case 5:
UartDev.data_bits = UART_FIVE_BITS;
break;
case 6:
UartDev.data_bits = UART_SIX_BITS;
break;
case 7:
UartDev.data_bits = UART_SEVEN_BITS;
break;
case 8:
UartDev.data_bits = UART_EIGHT_BITS;
break;
default:
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "invalid data bits"));
break;
}
if (parity == PARITY_NONE) {
UartDev.parity = UART_NONE_BITS;
UartDev.exist_parity = UART_STICK_PARITY_DIS;
} else {
UartDev.exist_parity = UART_STICK_PARITY_EN;
if (parity == PARITY_ODD) {
UartDev.parity = UART_ODD_BITS;
} else {
UartDev.parity = UART_EVEN_BITS;
}
}
switch (stop) {
case 1:
UartDev.stop_bits = UART_ONE_STOP_BIT;
break;
case 2:
UartDev.stop_bits = UART_TWO_STOP_BIT;
break;
default:
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "invalid stop bits"));
break;
}
uart_setup(UART1);
self->deinited = false;
}
bool common_hal_busio_uart_deinited(busio_uart_obj_t *self) {
return self->deinited;
}
void common_hal_busio_uart_deinit(busio_uart_obj_t *self) {
if (common_hal_busio_uart_deinited(self)) {
return;
}
// Switch GPIO2 back to a GPIO pin.
PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO2_U, FUNC_GPIO2);
self->deinited = true;
}
size_t common_hal_busio_uart_read(busio_uart_obj_t *self, uint8_t *data, size_t len, int *errcode) {
return 0;
}
// Write characters.
size_t common_hal_busio_uart_write(busio_uart_obj_t *self, const uint8_t *data, size_t len, int *errcode) {
// write the data
for (size_t i = 0; i < len; ++i) {
uart_tx_one_char(UART1, *data++);
}
// return number of bytes written
return len;
}
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) {
UartDev.baut_rate = baudrate;
uart_setup(UART1);
self->baudrate = baudrate;
}
uint32_t common_hal_busio_uart_rx_characters_available(busio_uart_obj_t *self) {
return 0;
}
bool common_hal_busio_uart_ready_to_tx(busio_uart_obj_t *self) {
return true;
}