KEA8使用ADC利用FIFO采样取值后值是相反的求助

zidian · 发表于 2018-6-5 19:33:10

最近在用KEA 8的ADC多路采样功能呢？配置时钟，软件触发，二级FIFO深度, 使能中断，
选通两路：第二路（PTA6脚）和温度采集功能。
void ADC_Init()
{
SIM->SCGC |= SIM_SCGC_ADC_MASK;    /* Enable bus clock in ADC, BUS CLOCK=10MHz*/
ADC->APCTL1  = ADC_APCTL1_ADPC(1<<2); /* when ADx=1 I/O control disabled so that cold used as analog inputs */
ADC->SC3  |= ADC_SC3_ADICLK(0x01)|             /* Bus clock Dived By 2 selected,ADC Clock =5MHz*/
                     ADC_SC3_ADIV(0x03)|                   /* ADC Clock = 625Khz£¬refer to Temp convention long sample no more than 1Mhz*/
                     ADC_SC3_ADLSMP_MASK|             /* adapt long sample time*/
      ADC_SC3_MODE(TWELVE_BIT);    /* TWELVE_BIT Conversion Mode Selection */
ADC->SC4  |= ADC_SC4_AFDEP(0x01);                /* 2-level FIFO is enabled*/
ADC->SC2 = 0x00;             /* Software Conversion trigger, disable compare function*/
ADC->SC1 = ADC_SC1_ADCO_MASK|
                           ADC_SC1_AIEN_MASK|ADC_SC1_ADCH(channel_2);  /* set up channel_2 for presure sensor  */
ADC->SC1 = ADC_SC1_ADCH(channel_TempSensor)|
                           ADC_SC1_ADCO_MASK|ADC_SC1_AIEN_MASK;       /* Continuous mode operation */

NVIC_EnableIRQ(ADC0_IRQn); /* enable ADC interrupt */
NVIC_SetPriority(ADC0_IRQn,0);
}
读数据中断函数：存储在数组里留待备用；
void ADC0_IRQHandler()
{
PresureBuff[Datacount]  = ADC->R&ADC_R_ADR_MASK;
TempBuff[Datacount] = ADC->R&ADC_R_ADR_MASK;
Datacount++;
if(Datacount==5)Datacount = 0;
}

问题：为啥最后调试的相应的值有时候会反的，不解。
有人遇见过同样问题吗？

我知道答案目前已有3人回答

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