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/*
* Karl Palsson <karlp@tweak.net.au> Oct 2017
* Considered to be available under your choice of:
* BSD2 clause, Apache2, MIT, X11 or ISC licenses
*/
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <libopencm3/cm3/nvic.h>
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/usart.h>
#include "uart-basic.h"
/* prototype to make linking happy */
int _write(int file, char *ptr, int len);
static struct ub_hw *ub;
static uint8_t last_rxb;
/* Implement _write for newlib to use printf */
int _write(int file, char *ptr, int len)
{
int i;
if (file == STDOUT_FILENO || file == STDERR_FILENO) {
for (i = 0; i < len; i++) {
if (ptr[i] == '\n') {
usart_send_blocking(ub->uart, '\r');
}
usart_send_blocking(ub->uart, ptr[i]);
}
return i;
}
errno = EIO;
return -1;
}
void ub_init(struct ub_hw *ub_input)
{
ub = ub_input;
rcc_periph_clock_enable(ub->uart_rcc);
usart_set_baudrate(ub->uart, 115200);
usart_set_databits(ub->uart, 9);
usart_set_stopbits(ub->uart, USART_STOPBITS_1);
usart_set_mode(ub->uart, USART_MODE_TX_RX);
usart_set_parity(ub->uart, USART_PARITY_EVEN);
usart_set_flow_control(ub->uart, USART_FLOWCONTROL_NONE);
usart_enable_rx_interrupt(ub->uart);
nvic_enable_irq(ub->uart_nvic);
usart_enable(ub->uart);
}
void ub_task(void)
{
if (last_rxb) {
printf("Last rx char was: <%c>\n", last_rxb);
last_rxb = 0;
} else {
printf("enter a character!\n");
}
}
void ub_irq_handler(void)
{
if (usart_get_flag(ub->uart, USART_FLAG_RXNE)) {
last_rxb = usart_recv(ub->uart);
}
}
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