119 lines
4.3 KiB
C
119 lines
4.3 KiB
C
/*
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* MIT License
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*
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* Copyright (c) 2020 Joey Castillo
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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 all
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* 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 THE
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* SOFTWARE.
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*/
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#include "watch_uart.h"
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#include <string.h>
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struct usart_sync_descriptor USART_0;
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struct io_descriptor *uart_io;
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void watch_enable_uart(const uint8_t tx_pin, const uint8_t rx_pin, uint32_t baud) {
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SERCOM_USART_CTRLA_Type ctrla;
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SERCOM_USART_CTRLB_Type ctrlb;
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ctrla.reg = SERCOM_USART_CTRLA_DORD | SERCOM_USART_CTRLA_MODE(1);
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ctrlb.reg = SERCOM_USART_CTRLB_CHSIZE(0);
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MCLK->APBCMASK.reg |= MCLK_APBCMASK_SERCOM3;
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GCLK->PCHCTRL[SERCOM3_GCLK_ID_CORE].reg = GCLK_PCHCTRL_GEN(0) | GCLK_PCHCTRL_CHEN;
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while (0 == (GCLK->PCHCTRL[SERCOM3_GCLK_ID_CORE].reg & GCLK_PCHCTRL_CHEN)) {
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// wait
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}
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usart_sync_init(&USART_0, SERCOM3, (void *)NULL);
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SERCOM3->USART.CTRLA.reg &= ~SERCOM_USART_CTRLA_ENABLE;
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switch (tx_pin) {
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case A2:
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gpio_set_pin_direction(tx_pin, GPIO_DIRECTION_OUT);
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gpio_set_pin_function(tx_pin, PINMUX_PB02C_SERCOM3_PAD0);
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ctrla.reg |= SERCOM_USART_CTRLA_TXPO(0);
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ctrlb.reg |= SERCOM_USART_CTRLB_TXEN;
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break;
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case A4:
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gpio_set_pin_direction(tx_pin, GPIO_DIRECTION_OUT);
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gpio_set_pin_function(tx_pin, PINMUX_PB00C_SERCOM3_PAD2);
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ctrla.reg |= SERCOM_USART_CTRLA_TXPO(1);
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ctrlb.reg |= SERCOM_USART_CTRLB_TXEN;
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break;
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default:
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break;
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}
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switch (rx_pin) {
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case A1:
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gpio_set_pin_direction(rx_pin, GPIO_DIRECTION_IN);
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gpio_set_pin_function(rx_pin, PINMUX_PB01C_SERCOM3_PAD3);
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ctrla.reg |= SERCOM_USART_CTRLA_RXPO(3);
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ctrlb.reg |= SERCOM_USART_CTRLB_RXEN;
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break;
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case A2:
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gpio_set_pin_direction(rx_pin, GPIO_DIRECTION_IN);
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gpio_set_pin_function(rx_pin, PINMUX_PB02C_SERCOM3_PAD0);
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ctrla.reg |= SERCOM_USART_CTRLA_RXPO(0);
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ctrlb.reg |= SERCOM_USART_CTRLB_RXEN;
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break;
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case A3:
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gpio_set_pin_direction(rx_pin, GPIO_DIRECTION_IN);
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gpio_set_pin_function(rx_pin, PINMUX_PB03C_SERCOM3_PAD1);
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ctrla.reg |= SERCOM_USART_CTRLA_RXPO(1);
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ctrlb.reg |= SERCOM_USART_CTRLB_RXEN;
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break;
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case A4:
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gpio_set_pin_direction(rx_pin, GPIO_DIRECTION_IN);
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gpio_set_pin_function(rx_pin, PINMUX_PB00C_SERCOM3_PAD2);
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ctrla.reg |= SERCOM_USART_CTRLA_RXPO(2);
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ctrlb.reg |= SERCOM_USART_CTRLB_RXEN;
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break;
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default:
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break;
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}
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SERCOM3->USART.CTRLA.reg = ctrla.reg;
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SERCOM3->USART.CTRLB.reg = ctrlb.reg;
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if (hri_usbdevice_get_CTRLA_ENABLE_bit(USB)) {
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uint64_t br = 65536 - ((65536 * 16.0f * baud) / 8000000);
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SERCOM3->USART.BAUD.reg = (uint16_t)br;
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} else {
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uint64_t br = 65536 - ((65536 * 16.0f * baud) / 4000000);
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SERCOM3->USART.BAUD.reg = (uint16_t)br;
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}
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SERCOM3->USART.CTRLA.reg |= SERCOM_USART_CTRLA_ENABLE;
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usart_sync_enable(&USART_0);
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usart_sync_get_io_descriptor(&USART_0, &uart_io);
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}
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void watch_uart_puts(char *s) {
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io_write(uart_io, (uint8_t *)s, strlen(s));
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}
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char watch_uart_getc(void) {
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uint8_t retval;
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io_read(uart_io, &retval, 1);
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return retval;
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}
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