Hello 王 腾博
我简单讲述一下我的测试过程：
你的分享工程有error，所以我自己做了一个测试工程。
测试结果如下：
确实这如你所说，当PTE20工作于GPIO 或者TPM功能时，确实也可采样当时当下引脚上的电压值。
谢谢你的分享。
/*
* File: adc_test.c
* Purpose: Main process
*
*/
#include "common.h"
#ifdef CMSIS
#include "start.h"
#endif
void adc_init (void)
{
SIM_SCGC5 |= SIM_SCGC5_PORTE_MASK;
PORTE_PCR20 |= PORT_PCR_MUX(1);
GPIOE_PDDR |= (1<<20);
GPIOE_PSOR |=(1<<20);
SIM_SCGC6 |= SIM_SCGC6_ADC0_MASK;
ADC0_CFG1 = ADC_CFG1_ADLSMP_MASK | ADC_CFG1_MODE(2) | ADC_CFG1_ADICLK(1)| ADC_CFG1_ADIV(2);
ADC0_SC2 = 0;
ADC0_SC3 |= ADC_SC3_ADCO_MASK |ADC_SC3_AVGE_MASK |ADC_SC3_AVGS(1) ;
ADC0_SC1A &= ~(ADC_SC1_DIFF_MASK);
ADC0_SC1A &=~(ADC_SC1_AIEN_MASK);
}
int adc_read(char channel)
{
int ADCResutl=0;
ADC0_SC1A = ADC_SC1_ADCH(channel);
while (!(ADC0_SC1A & ADC_SC1_COCO_MASK));
ADCResutl =(int )ADC0_RA;
ADC0_SC1A &= ~ADC_SC1_COCO_MASK;
return ADCResutl;
}
/********************************************************************/
int main (void)
{
int RA;
#ifdef CMSIS // If we are conforming to CMSIS, we need to call start here
start();
#endif
printf("\n\rRunning the adc_test project.\n\r");
adc_init();
while(1)
{
// out_char(ch);
RA=adc_read(0);
printf("Vout=%d\n",RA);
}
}
Have a great day,
Ping
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