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