222f93f023
This platform is a basic waveshare stm32f107 devkit which contains a USART, USB device port, some buttons and some LEDs. Unfortunately not enough to bring up networking, but enough to test building and a simple contiki shell
95 lines
1.9 KiB
C
95 lines
1.9 KiB
C
#include <libopencm3/stm32/usart.h>
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#include <libopencm3/cm3/nvic.h>
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#include <libopencm3/stm32/f1/gpio.h>
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#include <gqueue.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <errno.h>
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DECLARE_QUEUE(char, uart_tx_buf, 256);
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DECLARE_QUEUE(char, uart_rx_buf, 256);
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static void uart_init_gpio(void)
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{
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gpio_set_mode(GPIOA,
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GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_ALTFN_PUSHPULL,
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GPIO9);
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gpio_set_mode(GPIOA,
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GPIO_MODE_INPUT,
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GPIO_CNF_INPUT_FLOAT,
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GPIO10);
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/* USART lines should idle high */
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gpio_set(GPIOA, GPIO9);
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gpio_set(GPIOA, GPIO10);
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}
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void uart_init(int baud)
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{
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uart_init_gpio();
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nvic_enable_irq(NVIC_USART1_IRQ);
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nvic_set_priority(NVIC_USART1_IRQ, 2);
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usart_set_baudrate(USART1, baud);
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usart_set_databits(USART1, 8);
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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_stopbits(USART1, USART_CR2_STOPBITS_1);
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usart_set_mode(USART1, USART_MODE_TX_RX);
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usart_enable_rx_interrupt(USART1);
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usart_enable(USART1);
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/* This ensures stdio doesn't use its own buffers */
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setvbuf(stdin, NULL, _IONBF, 0);
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setvbuf(stdout, NULL, _IONBF, 0);
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}
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int uart_putchar(char c)
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{
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if( c == '\n')
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uart_putchar('\r');
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if(!queue_is_full(&uart_tx_buf)) {
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queue_enqueue(&uart_tx_buf, &c);
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} else {
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return -ENOMEM;
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}
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usart_enable_tx_interrupt(USART1);
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return 0;
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}
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int uart_getchar(char *c)
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{
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if(!queue_is_empty(&uart_rx_buf)) {
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queue_dequeue(&uart_rx_buf, c);
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return 0;
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} else {
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return -ENODATA;
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}
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}
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void usart1_isr(void)
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{
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char c;
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if (usart_get_flag(USART1, USART_SR_TXE)) {
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if (!queue_is_empty(&uart_tx_buf)) {
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queue_dequeue(&uart_tx_buf, &c);
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usart_send(USART1, (uint16_t)c);
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} else {
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usart_disable_tx_interrupt(USART1);
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}
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}
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if (usart_get_flag(USART1, USART_SR_RXNE)) {
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if (!queue_is_full(&uart_rx_buf)) {
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c = usart_recv(USART1);
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queue_enqueue(&uart_rx_buf, &c);
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}
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}
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}
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