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