Content originally posted in LPCWare by blasiis on Mon Jun 21 08:34:59 MST 2010
LPC1758
I have this simple code for read the AD from 2 to 7, I read this value in different time. This routine run every 1 ms .
Normally all is OK, it happens sometimes that a single value read is = 0 (only one among others), may depend on what?
I have checked with oscilloscope the analog in put and it is ok.
Thanks
void ReadADC ()
{
uint32_t ADCR, ADGR;
ADGR = LPC_ADC->ADGDR;
ADCR = LPC_ADC->ADCR;
switch (ADCR & 0x00ff)
{
case 0x04:
mem_In_2 = ADC_ChannelGetData(LPC_ADC,ADC_CHANNEL_2);
ADC_ChannelCmd(LPC_ADC,ADC_CHANNEL_2,DISABLE);
ADC_ChannelCmd(LPC_ADC,ADC_CHANNEL_3,ENABLE);
break;
case 0x08:
mem_In_3 = ADC_ChannelGetData(LPC_ADC,ADC_CHANNEL_3);
ADC_ChannelCmd(LPC_ADC,ADC_CHANNEL_3,DISABLE);
ADC_ChannelCmd(LPC_ADC,ADC_CHANNEL_4,ENABLE);
break;
case 0x10:
mem_In_4 = ADC_ChannelGetData(LPC_ADC,ADC_CHANNEL_4);
In_Corr_Chair = ((mem_In_Corr_Chair [0] + mem_In_Corr_Chair [1] + mem_In_Corr_Chair [2]) / 3) >> 4;
ADC_ChannelCmd(LPC_ADC,ADC_CHANNEL_4,DISABLE);
ADC_ChannelCmd(LPC_ADC,ADC_CHANNEL_5,ENABLE);
break;
case 0x20:
mem_In_5 = ADC_ChannelGetData(LPC_ADC,ADC_CHANNEL_5);
ADC_ChannelCmd(LPC_ADC,ADC_CHANNEL_5,DISABLE);
ADC_ChannelCmd(LPC_ADC,ADC_CHANNEL_6,ENABLE);
break;
case 0x40:
mem_In_6 = ADC_ChannelGetData(LPC_ADC,ADC_CHANNEL_6);
ADC_ChannelCmd(LPC_ADC,ADC_CHANNEL_6,DISABLE);
ADC_ChannelCmd(LPC_ADC,ADC_CHANNEL_7,ENABLE);
break;
case 0x80:
mem_In_7 = ADC_ChannelGetData(LPC_ADC,ADC_CHANNEL_7);
ADC_ChannelCmd(LPC_ADC,ADC_CHANNEL_7,DISABLE);
ADC_ChannelCmd(LPC_ADC,ADC_CHANNEL_2,ENABLE);
break;
}
ADC_StartCmd(LPC_ADC,ADC_START_NOW);
}
