LPC11U24 ADC problem

[coolxiangm]

Hi,

I'm testing ADC portion of LPC11U24. The example code has AD0 working, and I want to trigger additional AD1 working. I modify the code

int main(void)
{
uint16_t dataADC;
uint16_t dataADC1;
int j;

SystemCoreClockUpdate();
Board_Init();
Init_ADC_PinMux();
DEBUGSTR("ADC Demo\r\n");

/* Setup GPIOs */
//Chip_GPIO_SetPinDIR(LPC_GPIO, 0, 11, FALSE);

/* ADC Init */
Chip_ADC_Init(LPC_ADC, &ADCSetup);
Chip_ADC_EnableChannel(LPC_ADC, ADC_CH0, ENABLE);
Chip_ADC_EnableChannel(LPC_ADC, ADC_CH1, ENABLE);

while (1) {
/* Start A/D conversion */
Chip_ADC_SetStartMode(LPC_ADC, ADC_START_NOW, ADC_TRIGGERMODE_RISING);

/* Waiting for A/D conversion complete */
while (Chip_ADC_ReadStatus(LPC_ADC, ADC_CH0, ADC_DR_DONE_STAT) != SET) {}

/* Read ADC value */
Chip_ADC_ReadValue(LPC_ADC, ADC_CH0, &dataADC);

/* Print ADC value */
DEBUGOUT("ADC value is 0x%x\r\n", dataADC);

while (Chip_ADC_ReadStatus(LPC_ADC, ADC_CH1, ADC_DR_DONE_STAT) != SET) {}
Chip_ADC_ReadValue(LPC_ADC, ADC_CH1, &dataADC1);
//DEBUGOUT("ADC value is 0x%x\r\n", dataADC1);

/* Delay */
j = 500000;
while (j--) {}
}

/* Should not run to here */
return 0;
}

#endif /* !defined(CHIP_LPC1125) */

When I run the program into debug mode, the program stop at 

"while (Chip_ADC_ReadStatus(LPC_ADC, ADC_CH1, ADC_DR_DONE_STAT) != SET) {}"

Do you know which step I'm wrong?

Frank

[Alice_Yang]

Hello,

Please confirm whether connect and configure right ADC channel and pin, also measure whether there is ADC signal.

BR

Alice

[coolxiangm]

so you think my code has no problem? when I run the code under debug mode, it always stuck at second while (Chip_ADC_ReadStatus(LPC_ADC, ADC_CH1, ADC_DR_DONE_STAT) != SET) {}

[Alice_Yang]

Hello,

Stuck here meaning A/D conversion not completes.

About ADC code, recommend you refer to ADC demo under lpcopen.

BR

Alice