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/*
* MIT License
*
* Copyright (c) 2020 Joey Castillo
*
* 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 "watch_uart.h"
#include <string.h>
struct usart_sync_descriptor USART_0;
struct io_descriptor *uart_io;
void watch_enable_uart(const uint8_t tx_pin, const uint8_t rx_pin, uint32_t baud) {
SERCOM_USART_CTRLA_Type ctrla;
SERCOM_USART_CTRLB_Type ctrlb;
ctrla.reg = SERCOM_USART_CTRLA_DORD | SERCOM_USART_CTRLA_MODE(1);
ctrlb.reg = SERCOM_USART_CTRLB_CHSIZE(0);
MCLK->APBCMASK.reg |= MCLK_APBCMASK_SERCOM3;
GCLK->PCHCTRL[SERCOM3_GCLK_ID_CORE].reg = GCLK_PCHCTRL_GEN(0) | GCLK_PCHCTRL_CHEN;
while (0 == (GCLK->PCHCTRL[SERCOM3_GCLK_ID_CORE].reg & GCLK_PCHCTRL_CHEN)) {
// wait
}
usart_sync_init(&USART_0, SERCOM3, (void *)NULL);
SERCOM3->USART.CTRLA.reg &= ~SERCOM_USART_CTRLA_ENABLE;
switch (tx_pin) {
case A2:
gpio_set_pin_direction(tx_pin, GPIO_DIRECTION_OUT);
gpio_set_pin_function(tx_pin, PINMUX_PB02C_SERCOM3_PAD0);
ctrla.reg |= SERCOM_USART_CTRLA_TXPO(0);
ctrlb.reg |= SERCOM_USART_CTRLB_TXEN;
break;
case A4:
gpio_set_pin_direction(tx_pin, GPIO_DIRECTION_OUT);
gpio_set_pin_function(tx_pin, PINMUX_PB00C_SERCOM3_PAD2);
ctrla.reg |= SERCOM_USART_CTRLA_TXPO(1);
ctrlb.reg |= SERCOM_USART_CTRLB_TXEN;
break;
default:
break;
}
switch (rx_pin) {
case A1:
gpio_set_pin_direction(rx_pin, GPIO_DIRECTION_IN);
gpio_set_pin_function(rx_pin, PINMUX_PB01C_SERCOM3_PAD3);
ctrla.reg |= SERCOM_USART_CTRLA_RXPO(3);
ctrlb.reg |= SERCOM_USART_CTRLB_RXEN;
break;
case A2:
gpio_set_pin_direction(rx_pin, GPIO_DIRECTION_IN);
gpio_set_pin_function(rx_pin, PINMUX_PB02C_SERCOM3_PAD0);
ctrla.reg |= SERCOM_USART_CTRLA_RXPO(0);
ctrlb.reg |= SERCOM_USART_CTRLB_RXEN;
break;
case A3:
gpio_set_pin_direction(rx_pin, GPIO_DIRECTION_IN);
gpio_set_pin_function(rx_pin, PINMUX_PB03C_SERCOM3_PAD1);
ctrla.reg |= SERCOM_USART_CTRLA_RXPO(1);
ctrlb.reg |= SERCOM_USART_CTRLB_RXEN;
break;
case A4:
gpio_set_pin_direction(rx_pin, GPIO_DIRECTION_IN);
gpio_set_pin_function(rx_pin, PINMUX_PB00C_SERCOM3_PAD2);
ctrla.reg |= SERCOM_USART_CTRLA_RXPO(2);
ctrlb.reg |= SERCOM_USART_CTRLB_RXEN;
break;
default:
break;
}
SERCOM3->USART.CTRLA.reg = ctrla.reg;
SERCOM3->USART.CTRLB.reg = ctrlb.reg;
if (hri_usbdevice_get_CTRLA_ENABLE_bit(USB)) {
uint64_t br = 65536 - ((65536 * 16.0f * baud) / 8000000);
SERCOM3->USART.BAUD.reg = (uint16_t)br;
} else {
uint64_t br = 65536 - ((65536 * 16.0f * baud) / 4000000);
SERCOM3->USART.BAUD.reg = (uint16_t)br;
}
SERCOM3->USART.CTRLA.reg |= SERCOM_USART_CTRLA_ENABLE;
usart_sync_enable(&USART_0);
usart_sync_get_io_descriptor(&USART_0, &uart_io);
}
void watch_uart_puts(char *s) {
io_write(uart_io, (uint8_t *)s, strlen(s));
}
char watch_uart_getc(void) {
uint8_t retval;
io_read(uart_io, &retval, 1);
return retval;
}
// Begin deprecated functions
/*
* UART methods are Copyright (c) 2014-2017, Alex Taradov <alex@taradov.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "peripheral_clk_config.h"
void watch_enable_debug_uart(uint32_t baud) {
uint64_t br = (uint64_t)65536 * ((CONF_CPU_FREQUENCY * 4) - 16 * baud) / (CONF_CPU_FREQUENCY * 4);
gpio_set_pin_direction(A2, GPIO_DIRECTION_OUT);
gpio_set_pin_function(A2, PINMUX_PB02C_SERCOM3_PAD0);
MCLK->APBCMASK.reg |= MCLK_APBCMASK_SERCOM3;
GCLK->PCHCTRL[SERCOM3_GCLK_ID_CORE].reg = GCLK_PCHCTRL_GEN(0) | GCLK_PCHCTRL_CHEN;
while (0 == (GCLK->PCHCTRL[SERCOM3_GCLK_ID_CORE].reg & GCLK_PCHCTRL_CHEN));
SERCOM3->USART.CTRLA.reg =
SERCOM_USART_CTRLA_DORD | SERCOM_USART_CTRLA_MODE(1/*USART_INT_CLK*/) |
SERCOM_USART_CTRLA_RXPO(1/*PAD1*/) | SERCOM_USART_CTRLA_TXPO(0/*PAD0*/);
SERCOM3->USART.CTRLB.reg = SERCOM_USART_CTRLB_RXEN | SERCOM_USART_CTRLB_TXEN |
SERCOM_USART_CTRLB_CHSIZE(0/*8 bits*/);
SERCOM3->USART.BAUD.reg = (uint16_t)br;
SERCOM3->USART.CTRLA.reg |= SERCOM_USART_CTRLA_ENABLE;
}
void watch_debug_putc(char c) {
while (!(SERCOM3->USART.INTFLAG.reg & SERCOM_USART_INTFLAG_DRE));
SERCOM3->USART.DATA.reg = c;
}
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
void watch_debug_puts(char *s) {
while (*s) watch_debug_putc(*s++);
}
#pragma GCC diagnostic pop
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