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70 lines
1.2 KiB
70 lines
1.2 KiB
#include "stm8s.h"
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#include <stdlib.h>
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void Delay(uint16_t nCount) {
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uint8_t i;
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for (; nCount != 0; nCount--) {
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for (i = 255; i != 0; i--) {}
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}
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}
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void putchar(char c) {
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while ((UART1->SR & UART1_SR_TXE) == 0);
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UART1->DR = (u8)c;
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}
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void puts(const char *ch) {
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char c;
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while ((c = *ch++) != 0)
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putchar(c);
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}
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void puts_itoa(int32_t n, unsigned char radix) {
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char s[10], i, c;
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_ltoa(n, s, radix);
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i = 0;
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while((c = s[i++]) != 0) {
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putchar(c);
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}
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}
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void main(void)
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{
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// Disable div8
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CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);
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// LED for blinking
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GPIO_Init(GPIOB, GPIO_PIN_5, GPIO_MODE_OUT_PP_HIGH_FAST);
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// minimal uart init
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UART_SimpleInit(UART_BAUD_115200);
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// irq conf
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UART1_ITConfig(UART1_IT_RXNE_OR, ENABLE);
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enableInterrupts();
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// Clear screen & print system frequency
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puts("\033c\033[?25lClock freq = "); // cls
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puts_itoa(CLK_GetClockFreq(), 10);
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puts(" Hz"); // cls
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// echo & blinking
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while (1) {
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Delay(2000);
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GPIOB->ODR ^= GPIO_PIN_5;
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}
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}
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/**
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* @brief UART1 RX Interrupt routine.
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* @param None
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* @retval None
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*/
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INTERRUPT_HANDLER(UART1_RX_IRQHandler, 18)
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{
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if (UART1->SR & UART1_SR_RXNE)
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UART1->DR = (u8) (UART1->DR); // echo
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if (UART1->SR & UART1_SR_OR)
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UART1->SR &= ~UART1_SR_OR; // clear OR flag
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}
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