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/*硬件連接*/
// PB0<----PC4
/****************************************************************************************
*開發環境:IAR for stm8 v6.5.3
*硬件平臺:STM8L-DISCOVERY
*功能說明:本例程,通過CC0輸出32.768KHz的方波,提供給TIM2的捕獲輸入引腳PB0測量
*作者：茗風
****************************************************************************************/
#include"iostm8l152c6.h"
#include"stdint.h"
uint16_t tim2_ccr1=0,tim2_ccr2=0;
uint8_t f_finish=0;
/******************************************************************************************************
* 名稱：void CLOCK_Init(void)
* 功能：通過PC4輸出選擇的時鐘
* 入口參數：無
* 出口參數：無
* 說明：PC4輸出32.768KHz的方波,提供給TIM2的捕獲引腳PB0測量
* 范例：無
******************************************************************************************************/
void CLOCK_Init(void)
{
PC_CR1_C14 =1;//推挽輸出
PC_CR2_C24 =1;//高速輸出
PC_DDR_DDR4 =1;//PC4輸出
CLK_CCOR_CCODIV=0x00;//選擇分頻值
/*
*0x00 CCO divided by 1
*0x01 CCO divided by 2
*0x02 CCO divided by 4
*0x03 CCO divided by 8
*0x04 CCO divided by 16
*0x05 CCO divided by 32
*0x06 CCO divided by 64
*0x07 CCO divided by 64
*/
CLK_CCOR_CCOSEL =0x08;//選擇輸出時鐘，這里選擇外部32.768KHz的時鐘做測試
/*
*0x01 HSI clock output clock source
*0x02 LSI clock output clock source
*0x04 HSE clock output clock source
*0x08 LSE clock output clock source
*/
}
/******************************************************************************************************
* 名稱：void TIMER2_Init(void)
* 功能：STM8定時器2捕獲功能初始化
* 入口參數：無
* 出口參數：無
* 說明：PB0為捕獲輸入引腳,使用通道0
* 范例：無
******************************************************************************************************/
void TIMER2_Init(void)
{
PB_DDR_DDR0 =0;//輸入
PB_CR1_C10 =0;//浮空輸入
// PB_CR1_C10 =1;//上拉輸入
PB_CR2_C20 =0;//禁止外部中斷功能
CLK_PCKENR1_PCKEN10=1;//打開定時器2時鐘
//------設置TIM2時鐘分頻值------
TIM2_PSCR_PSC=0;//分頻值 2M/2^0=2M/1=2000000Hz
//-重裝值,TIM2從0計數到此值,發生溢出-
// TIM2_ARRH=0;
// TIM2_ARRL=100;
//----AUTO_RELOAD 預裝載使能----
TIM2_CR1_ARPE =0;//不通過預裝載寄存器
TIM2_CR1_URS=1;//僅當計數器溢出時才發生中斷請求
TIM2_CR1_UDIS=1;//禁止更新事件//計數器溢出屬于更新事件
TIM2_CR1_DIR=0;//向上計數
// TIM2_CCER1_CC1E=0;//清零使能位,為了配置寄存器
// TIM2_CCER1_CC2E=0;//清零使能位,為了配置寄存器
TIM2_CCMR1=0;
// TIM2_CCMR1=0x00; //IC1F=0000 輸入信號不分頻
TIM2_CCMR1 |=0x01;//CC1S=01 IC1 is mapped on TI1FP1
/*00: CC1 channel is configured as output
01: CC1 channel is configured as input, IC1 is mapped on TI1FP1
10: CC1 channel is configured as input, IC1 is mapped on TI2FP1
11: Reserved */
TIM2_CCMR2=0;
// TIM2_CCMR2=0x00;//IC1PSC=0 輸入信號不分頻
TIM2_CCMR2 |=0x02;// TIM2_CCMR2_CC2S=0x2
/* 00: CC2 channel is configured as output
01: CC2 channel is configured as input, IC2 is mapped on TI2FP2
10: CC2 channel is configured as input, IC2 is mapped on TI1FP2
11:CC2 channel is configured as input, IC2 is mapped on TRC */
TIM2_CCER1_CC1P=0;//上升沿時發生捕獲
TIM2_CCER1_CC2P=1;//下降沿時發生捕獲
TIM2_SMCR=0x54;//
// TIM2_SMCR_TS=0x05;//101 iput 1(TI1FP1) 頭文件有錯誤
// TIM2_SMCR_SMS=0x04;//復位觸發模式
TIM2_CCER1_CC1E=1;//使能捕獲功能
TIM2_CCER1_CC2E=1;//使能捕獲功能
TIM2_IER_CC1IE=1;//開啟捕獲中斷
TIM2_IER_CC2IE=1;//開啟捕獲中斷
TIM2_CR1_CEN=1;//開啟計數
}
void main(void)
{
static float tmp=0;
CLOCK_Init();
TIMER2_Init();
asm("rim"); //enable interrupts
while(1)
{
if(f_finish==0x01)
{
//1000000us/2000000=0.5us
//測量到的周期為 0.5us*59=29.5us
//測量到的周期為 1000000us/29.5us=33.898KHz
//實際CCO輸出的頻率為32.768KHz
tmp=1000/((float)tim2_ccr1*0.5);//tmp的值為測量到的頻率
f_finish=0;
asm("nop");
}
// asm("wfi");
}
}
#pragma vector=TIM2_CAPCOM_CC1IF_vector
__interrupt void TIM2_CAPCOM_CC1IF_ISR (void)
{
if(TIM2_SR1_CC1IF)
{
tim2_ccr1=TIM2_CCR1H;
tim2_ccr1<<=8;
tim2_ccr1+=TIM2_CCR1L;
TIM2_SR1_CC1IF=0;//清除中斷標志位
f_finish=1;
//tim2_ccr1得到的時間為整個周期的時間
}
else if(TIM2_SR1_CC2IF)
{
tim2_ccr2=TIM2_CCR2H;
tim2_ccr2<<=8;
tim2_ccr2+=TIM2_CCR2L;
TIM2_SR1_CC2IF=0;//清除中斷標志位
//tim2_ccr2得到的時間為高電平持續時間
}
}

復制代碼

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