一、寄存器开发方式
1)以定时器TIM4为例,首先对TIM4的相关寄存器进行初始化,打开TIM4的中断,注意在STVD+COSMIC的开发环境下,开总中断使用语句_asm("rim");
void TIM4_init(void) //TIM4 init
{
TIM4_CR1=0x80;
TIM4_PSCR=0x07; //clock div : 128 (T=8us)
TIM4_ARR=125; //interrupt per 1ms
TIM4_IER=0x01; //enable update interrupt
_asm("rim"); //enable EA
TIM4_EGR=0x01; //update case
TIM4_CR1|=0x01; //enable count
}
2)接下来编写TIM4的中断服务程序,可以直接写在main.c中,注意函数前一定要加@far @interrupt,中断服务函数的名称可以自己取,比如此处的TIM4_Interrupt;
@far @interrupt void TIM4_Interrupt(void)
{
TIM4_SR&=0xfe;
cnt_num4++;
if(cnt_num4>10)
{
cnt_num4=0;
flag_adc=1;
}
}
3)接下来在stm8_interrupt_vector.c文件中对中断函数进行声明,并修改中断向量表中对应的中断服务函数名称为我们定义的名称,如TIM4_Interrupt为中断向量的第23个;
extern void _stext(); /* startup routine */
extern @far @interrupt void TIM4_Interrupt(void);
{0x82, NonHandledInterrupt}, /* irq21 */
{0x82, NonHandledInterrupt}, /* irq22 */
{0x82, TIM4_Interrupt}, /* irq23 */
{0x82, NonHandledInterrupt}, /* irq24 */
{0x82, NonHandledInterrupt}, /* irq25 */
二、库函数开发方式
1)以外部中断为例,可用按键触发,首先初始化对应引脚,开启外部中断和总中断,开总中断使用语句_asm("rim");
void main(void)
{
CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);
GPIO_Init(GPIOA,GPIO_PIN_3,GPIO_MODE_OUT_PP_HIGH_FAST);
GPIO_Init(GPIOA,GPIO_PIN_2,GPIO_MODE_IN_PU_IT);
EXTI_SetExtIntSensitivity(EXTI_PORT_GPIOA,EXTI_SENSITIVITY_FALL_ONLY);
_asm("rim");
/* Infinite loop */
while (1)
{
;
}
}
2)接下来在stm8s_it.c文件中,找到对应中断向量的中断服务程序,在里面添加代码即可;
/**
* @brief External Interrupt PORTA Interrupt routine.
* @param None
* @retval None
*/
INTERRUPT_HANDLER(EXTI_PORTA_IRQHandler, 3)
{
/* In order to detect unexpected events during development,
it is recommended to set a breakpoint on the following instruction.
*/
GPIO_WriteReverse(GPIOA,GPIO_PIN_3);
}
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