37 lines
1,017 B
C
37 lines
1,017 B
C
#include "uart.h"
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#include <errno.h>
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#include <libopencm3/cm3/nvic.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/usart.h>
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#include <stdio.h>
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int _write(int file, char *ptr, int len);
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void usart_setup(void) {
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/* Setup GPIO pin GPIO_USART1_RE_TX on GPIO port B for transmit. */
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gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_TX);
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/* Setup UART parameters. */
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usart_set_baudrate(USART1, 115200);
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usart_set_databits(USART1, 8);
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usart_set_stopbits(USART1, USART_STOPBITS_1);
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usart_set_parity(USART1, USART_PARITY_NONE);
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usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
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usart_set_mode(USART1, USART_MODE_TX);
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/* Finally enable the USART. */
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usart_enable(USART1);
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}
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int _write(int file, char *ptr, int len) {
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int i;
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if (file == 1) {
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for (i = 0; i < len; i++) usart_send_blocking(USART1, ptr[i]);
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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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