some experiments with a chinese stm8s103
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stm8s_experiments/User/bootstrap.c

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//
// Created by MightyPork on 2017/02/10.
//
#include <stm8s.h>
#include "bootstrap.h"
/** Global time base */
volatile uint16_t time_ms;
/**
* Putchar for printf
* @param c - char to print
*/
void putchar(char c)
{
while ((UART1->SR & UART1_SR_TXE) == 0);
UART1->DR = (u8)c;
}
/**
* Init for the chinese STM8 board
* - enable LED
* - enable UART @ 115200
* - set up UART rx irq
*/
void SimpleInit(void)
{
// Disable default div/8 HSI prescaller
CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);
// LED
GPIO_Init(GPIOB, GPIO_PIN_5, GPIO_MODE_OUT_PP_HIGH_FAST);
// UART init & enable IRQ
UART_SimpleInit(UART_BAUD_115200);
UART1_ITConfig(UART1_IT_RXNE_OR, ENABLE);
// Timebase generation counter
TIM4_UpdateRequestConfig(TIM4_UPDATESOURCE_REGULAR);
TIM4_PrescalerConfig(TIM4_PRESCALER_128, TIM4_PSCRELOADMODE_IMMEDIATE);
TIM4_SetAutoreload(0xFF);
TIM4_ARRPreloadConfig(ENABLE);
TIM4_ITConfig(TIM4_IT_UPDATE, ENABLE);
TIM4_Cmd(ENABLE);
enableInterrupts();
}
/**
* @brief Timer4 Update/Overflow Interrupt routine.
* @param None
* @retval None
*/
INTERRUPT_HANDLER(TIM4_UPD_OVF_IRQHandler, 23)
{
time_ms++;
TIM4_ClearITPendingBit(TIM4_IT_UPDATE);
}
/** Delay ms */
void Delay(uint16_t ms)
{
uint16_t start = time_ms;
uint16_t t2;
while (1) {
t2 = time_ms;
if ((t2 - start) >= ms) {
break;
}
}
}
/** Delay N seconds */
void Delay_s(uint16_t s)
{
while (s != 0) {
Delay(1000);
s--;
}
}
/**
* UART1 RX Interrupt routine.
*/
INTERRUPT_HANDLER(UART1_RX_IRQHandler, 18)
{
if (UART1->SR & UART1_SR_RXNE) {
UART_HandleRx(UART1->DR);
}
}
// Comment out if custom rx handler is added
#if 1
void UART_HandleRx(char c)
{
// echo
putchar(c);
}
#endif