本实验参考 DC Monitoring例程，通过A1引脚进行电压测量。
首先进行外设初始化，其次在主循环里面进行电压测量。
- while (1)
- {
- /* Monitoring for every one second */
- Cy_SysLib_Delay(1000);
- Cy_ADCMic_SetInterruptMask(adcmic_0_HW, CY_ADCMIC_INTR_DC);
- Cy_ADCMic_ClearInterrupt(adcmic_0_HW, CY_ADCMIC_INTR);
- /* Enable the DC monitoring */
- Cy_ADCMic_Enable(adcmic_0_HW);
- /* ADC Settling Time */
- Cy_SysLib_Delay(10);
- /* Enable ADC timer to generate interrupt for reading the sample */
- Cy_ADCMic_EnableTimer(adcmic_0_HW);
- /* Wait for DC monitoring samples to complete */
- while(batmon_cplt);
- for (int i = 0; i < NO_OF_DC_SAMPLES; i++)
- {
- batmon_dc_avg = batmon_dc_avg + batmon_samples[i];
- }
- batmon_dc_avg = batmon_dc_avg/NO_OF_DC_SAMPLES;
- /* Convert the ADC code in millivolts */
- batt_level_mv = Cy_ADCMic_CountsTo_mVolts((int16_t)batmon_dc_avg, adcmic_0_config.dcConfig->context );
- printf("batt_level_mv = %d \r\n",batt_level_mv);
- /* Reset for the next set of readings */
- batmon_cplt = 1;
- batmon_dc_avg = 0;
- }
把扩展接口的3.3v连接到A1引脚，控制台输出当前电压：
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