107 lines
1.8 KiB
C
107 lines
1.8 KiB
C
#include <libopencm3/stm32/usart.h>
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/cm3/nvic.h>
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#include "debug.h"
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#define DEBUG_BUFFER_SIZE 128
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volatile char debugBuffer[DEBUG_BUFFER_SIZE];
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volatile uint16_t readPos, writePos;
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volatile uint8_t bufferFull, bufferEmpty, usartActive;
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void debug_init()
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{
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readPos = 0;
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writePos = 0;
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bufferFull = 0;
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bufferEmpty = 1;
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usartActive = 0;
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// Enable Clock
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rcc_periph_clock_enable(RCC_USART1);
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// enable interrupt
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nvic_enable_irq(NVIC_USART1_IRQ);
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/* Setup USART1 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_CR2_STOP_1_0BIT);
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usart_set_mode(USART1, USART_MODE_TX);
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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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/* Enable the USART1 TX Interrupt */
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usart_enable_tx_interrupt(USART1);
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/* Finally enable the USART. */
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usart_enable(USART1);
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}
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static void debug_transfer(void)
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{
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if(bufferEmpty) {
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usart_disable_tx_interrupt(USART1);
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usartActive = 0;
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return;
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}
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usart_send(USART1, debugBuffer[readPos]);
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readPos++;
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if(readPos == DEBUG_BUFFER_SIZE) {
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readPos = 0;
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}
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if(readPos == writePos) {
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bufferEmpty = 1;
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}
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bufferFull = 0;
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usart_enable_tx_interrupt(USART1);
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}
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void usart1_isr(void)
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{
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volatile uint32_t tmp = USART1_ISR;
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(void)tmp;
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if(USART1_ISR & USART_ISR_TXE){
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debug_transfer();
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}
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}
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void debug_send_string(char *str)
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{
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while(*str) {
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if(bufferFull) {
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break;
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}
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debugBuffer[writePos] = *str;
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writePos++;
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if(writePos == DEBUG_BUFFER_SIZE) {
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writePos = 0;
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}
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if(writePos == readPos) {
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bufferFull = 1;
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}
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bufferEmpty = 0;
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str++;
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}
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if(!usartActive) {
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usartActive = 1;
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debug_transfer();
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}
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}
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