STM8S903K3基于ST Visual Develop开发定时器1中断示例

• 📌相关篇《STM8S903K3T6C基于IAR开发GPIO点灯示例》

• 🎉在基于STVP环境下和IAR环境下，如果都使用寄存器操作，那么差异不大，主要在中断函数的书写上有差异。

📝本示例基于定时器1定时，产生中断来控制闪烁间隔时间，led引脚在PD7上。

🚩重装载值说明

如果是基于STVD寄存器开发，那么在写重装载寄存器的值时推荐将高低寄存器分开写，具体为什么，可以查看头文件寄存器地址具体位置就可以知道。

	TIM5_ARRH = 0x00; // 自动重载寄存器ARR=0x007cTIM5_ARRL = 0x7c; // 每1ms中断一次

TIM5_ARR = 0x7c;//自动重装的值,变成了每隔524ms一次了达不到预期。

• 头文件寄存器地址：

例如TIM5重装载寄存器，的高8位寄存器的地址和TIM5_ARR是相同的，如果直接赋值那相当于将重装载值直接赋值给了高8位的寄存器TIMx_ARRH。这一点特别需要注意！

/* TIM5 Auto-reload register */
DEF_16BIT_REG_AT(TIM5_ARR,0x530f);
/* Data bits High */
DEF_8BIT_REG_AT(TIM5_ARRH,0x530f);
/* Data bits Low */
DEF_8BIT_REG_AT(TIM5_ARRL,0x5310);

• ⚡TIM1也是如此

/* TIM1 Auto-reload register */
DEF_16BIT_REG_AT(TIM1_ARR,0x5262);
/* Data bits High */
DEF_8BIT_REG_AT(TIM1_ARRH,0x5262);
/* Data bits Low */
DEF_8BIT_REG_AT(TIM1_ARRL,0x5263);

🌼示例一

🔖使用外部8MHz时钟源定时，500ms，让PD7引脚led状态翻转。

#include"stm8s903k3.h"
unsigned char i=0;void Init_Timer1(void)
{CLK_ECKR = 0x01; //开启外部时钟寄存器CLK_SWR = 0xb4; //HSE外部时钟源作为主时钟源CLK_CKDIVR = 0x00;//不分频TIM1_CR1=0x01;//enable 使能计数器//TIM1_IER=0x00;//disable TIMERTIM1_IER=0x01;//更新中断使能TIM1_EGR=0x01;TIM1_CNTR=255;//计数器值TIM1_ARR=255;//自动重装的值，相当于**TIM1_ARRH**高位是0xffTIM1_PSCR=0x07;//分频值:2^7=128分频；T=128/8MHz=16us,16us*255*122=500ms}
void Init_GPIO(void)
{PD_DDR |=0x80;PD_CR1 |=0x80;PD_CR2 |=0x00;
}
void main()
{Init_GPIO();Init_Timer1();_asm("rim");while (1);
}@far @interrupt void TIM1_UPD_OVF_IRQHandler (void)
{i++;TIM1_SR1=0x00;// 清除更新中断标记，这步不能漏掉if(i==122){PD_ODR ^= 0x80;i=0;}return;
}

• 📈逻辑分析仪采集的波形
  

🌻示例二

🍁使用内部16MHz时钟源，定时1s，，让PD7引脚led状态翻转。

/* MAIN.C file* * Copyright (c) 2002-2005 STMicroelectronics*/
#include"stm8s903k3.h"
unsigned char i=0;void Init_Timer1(void)
{
//	CLK_ECKR = 0x01; //开启外部时钟寄存器
//  CLK_SWR = 0xb4; //HSE外部时钟源作为主时钟源
//  CLK_CKDIVR = 0x00;//不分频CLK_ICKR |= 0X01; //使能内部高速时钟 HSICLK_CKDIVR = 0x08; // 2分频while(!(CLK_ICKR&0x02)); //HSI准备就绪CLK_SWR =0xE1;//HSI内部时钟源作为主时钟源(复位值)  //TIM1_IER=0x00;//disable TIMERCLK_PCKENR1 |=0x80; //外设时钟门控寄存器TIM1_EGR=0x01;//计数器更新，可省略TIM1_PSCR=0x07;//分频值:8TIM1_CNTR=255;//计数器值TIM1_ARR=255;//自动重装的值TIM1_CR1=0x01;//enable 使能计数器TIM1_IER=0x01;//更新中断使能}
void Init_GPIO(void)
{PD_DDR |=0x80;PD_CR1 |=0x80;PD_CR2 |=0x00;
}
void main()
{_asm("sim");    //disable all interruptInit_GPIO();Init_Timer1();_asm("rim");//enable all interruptwhile (1);
}@far @interrupt void TIM1_UPD_OVF_IRQHandler (void)
{i++;TIM1_SR1=0x00;// 清除更新中断标记，这步不能漏掉if(i==122){PD_ODR ^= 0x80;i=0;}return;
}

• 📈逻辑分析仪采集的波形
  

• 两个示例中的stm8_interrupt_vector.c代码相同，都是采用的TIM1，中断号：11

typedef void @far (*interrupt_handler_t)(void);struct interrupt_vector {unsigned char interrupt_instruction;interrupt_handler_t interrupt_handler;
};@far @interrupt void NonHandledInterrupt (void)
{/* in order to detect unexpected events during development, it is recommended to set a breakpoint on the following instruction*/return;
}
extern @far @interrupt void TIM1_UPD_OVF_IRQHandler (void);
extern void _stext();     /* startup routine */struct interrupt_vector const _vectab[] = {{0x82, (interrupt_handler_t)_stext}, /* reset */{0x82, NonHandledInterrupt}, /* trap  */{0x82, NonHandledInterrupt}, /* irq0  */{0x82, NonHandledInterrupt}, /* irq1  */{0x82, NonHandledInterrupt}, /* irq2  */{0x82, NonHandledInterrupt}, /* irq3  */{0x82, NonHandledInterrupt}, /* irq4  */{0x82, NonHandledInterrupt}, /* irq5  */{0x82, NonHandledInterrupt}, /* irq6  */{0x82, NonHandledInterrupt}, /* irq7  */{0x82, NonHandledInterrupt}, /* irq8  */{0x82, NonHandledInterrupt}, /* irq9  */{0x82, NonHandledInterrupt}, /* irq10 */{0x82, TIM1_UPD_OVF_IRQHandler}, /* irq11 */{0x82, NonHandledInterrupt}, /* irq12 */{0x82, NonHandledInterrupt}, /* irq13 */{0x82, NonHandledInterrupt}, /* irq14 */{0x82, NonHandledInterrupt}, /* irq15 */{0x82, NonHandledInterrupt}, /* irq16 */{0x82, NonHandledInterrupt}, /* irq17 */{0x82, NonHandledInterrupt}, /* irq18 */{0x82, NonHandledInterrupt}, /* irq19 */{0x82, NonHandledInterrupt}, /* irq20 */{0x82, NonHandledInterrupt}, /* irq21 */{0x82, NonHandledInterrupt}, /* irq22 */{0x82, NonHandledInterrupt}, /* irq23     */{0x82, NonHandledInterrupt}, /* irq24 */{0x82, NonHandledInterrupt}, /* irq25 */{0x82, NonHandledInterrupt}, /* irq26 */{0x82, NonHandledInterrupt}, /* irq27 */{0x82, NonHandledInterrupt}, /* irq28 */{0x82, NonHandledInterrupt}, /* irq29 */
};

示例二效果方式二（推荐）

与上面的主要的差异在于将分配寄存器进行高8位低8位进行了拆解。

#include"stm8s903k3.h"
void Init_Timer1(void)
{
//	CLK_ECKR = 0x01; //开启外部时钟寄存器
//  CLK_SWR = 0xb4; //HSE外部时钟源作为主时钟源
//  CLK_CKDIVR = 0x00;//不分频CLK_ICKR |= 0X01; //使能内部高速时钟 HSICLK_CKDIVR = 0x08; // 16M,2分频后8MHzwhile(!(CLK_ICKR&0x02)); //HSI准备就绪CLK_SWR =0xE1;//HSI内部时钟源作为主时钟源(复位值)  //TIM1_IER=0x00;//disable TIMERCLK_PCKENR1 |=0x80; //外设时钟门控寄存器TIM1_EGR=0x01;//计数器更新，可省略TIM1_PSCRH = 0x1F; // 8M系统时钟经预分频f=fck/(PSCR+1)TIM1_PSCRL = 0x3F; // PSCR=0x1F3F，f=8M/(0x1F3F+1)=1000Hz，每个计数周期1msTIM1_ARRH = 0x03; // 自动重载寄存器ARR=0x01F4=500;0X03E8=1000TIM1_ARRL = 0xE8; // 每记数500次产生一次中断，即500msTIM1_RCR = 0x00;    //重复计数器值TIM1_SR1 = ( ~0x01 );          //清除更新中断标志TIM1_CR1=0x01;//enable 使能计数器TIM1_IER=0x01;//更新中断使能}
void Init_GPIO(void)
{PD_DDR |=0x80;// 配置PD端口的方向寄存器PD7输出PD_CR1 |=0x80;// 设置PD7为推挽输出PD_CR2 |=0x00;
}
void main()
{_asm("sim");    //disable all interruptInit_GPIO();Init_Timer1();_asm("rim");while (1);
}@far @interrupt void TIM1_UPD_OVF_IRQHandler (void)
{TIM1_SR1 =0x00;// 清除更新中断标记，这步不能漏掉PD_ODR ^= 0x80;}