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CC3200 AD测量数值为0

Other Parts Discussed in Thread: CC3200

CC3200 在项目工程中利用Pin58 AD测量,外接稳压稳压电压1.0v,循环读取10次,但是每次只有前四次成功读取数值,后面都是MAP_ADCFIFOLvlGet Failed

if(MAP_ADCFIFOLvlGet(ADC_BASE, ADC_CH_1))
{
ulSample = MAP_ADCFIFORead(ADC_BASE, ADC_CH_1);

UART_PRINT("MAP_ADCFIFORead is %d\n\r",ulSample);
}
else
{
UART_PRINT("MAP_ADCFIFOLvlGet Failed\n\r");

但是我在SDK example中,用相同的程序可以连续读取10次数值,都是成功的

请问会是什么原因导致的呢?