LPC4330-Xplorer Development Board receiving the ADC values

eugenr — Mon, 19 Jun 2017 14:24:30 GMT

I'm trying to retrieve the ADC value, and I am using the Chip_ADC_ReadValue() method. But he only enters the Handler method once and not always when the input at the ADC pin changes. I am still not totally aware of what I am doing since I am new in programming micro controllers. I hope somebody can help me.

This is my ADC_Init():

static void ADCInit(){
     uint32_t _bitRate = 400000;
     ADC_RESOLUTION_T _bitAccuracy = ADC_10BITS;

     Chip_ADC_Init(LPC_ADC0, &ADCSetup); //Initialize the ADC Pin
     Chip_ADC_EnableChannel(LPC_ADC0, ADC_CH1, ENABLE);
     Chip_ADC_Int_SetChannelCmd(LPC_ADC0, ADC_CH1, ENABLE);//Enable Channel 1 of the ADC0 Pin for Interrupt
     Chip_ADC_SetStartMode(LPC_ADC0, ADC_START_NOW, ADC_TRIGGERMODE_RISING);//Set it to trigger on the rising event, Set Mode on starting the conversion now

     Chip_ADC_SetSampleRate(LPC_ADC0, &ADCSetup, _bitRate);//Set the sample rate to 400kHz
     Chip_ADC_SetResolution(LPC_ADC0, &ADCSetup, _bitAccuracy);//Set the accuracy to 10 Bits if one is using more channels the accuracy has to be dropped


     /*Enable Interrupt*/
     NVIC_SetPriority( ADC0_IRQn, (configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY));
     NVIC_EnableIRQ( ADC0_IRQn );

}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

And this is my Interrupt Handler:

void ADC0_IRQHandler(void)
{
     uint16_t dataADC;
     /* Interrupt mode: Call the stream interrupt handler */
     Chip_ADC_Int_SetChannelCmd(LPC_ADC0, ADC_CH1, ENABLE);
     Chip_ADC_ReadValue(LPC_ADC0, ADC_CH1, &dataADC);
     SetADCValue(dataADC);
     storeItemInfftBuffer(dataADC);
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Thanks in advance

Re: LPC4330-Xplorer Development Board receiving the ADC values

kerryzhou — Tue, 04 Jul 2017 03:06:27 GMT

Hello eugenr,

You can refer to the lpcopen code for mcb 4357, there has the adc code.

http://www.nxp.com/downloads/en/software/lpcopen_3_01_keil_iar_mcb_4357.zip

It seems you didn't enable the burst mode, if yes, the ADC conversions are software controlled, you need to call :

Chip_ADC_SetStartMode(_LPC_ADC_ID, ADC_START_NOW, ADC_TRIGGERMODE_RISING);

After the ADC convert done, then trigger the next adc conversion.

/* Interrupt routine for ADC example */
static void App_Interrupt_Test(void)
{
   /* Enable ADC Interrupt */
   NVIC_EnableIRQ(_LPC_ADC_IRQ);
   Chip_ADC_Int_SetChannelCmd(_LPC_ADC_ID, _ADC_CHANNLE, ENABLE);
   /* Enable burst mode if any, the AD converter does repeated conversions
       at the rate selected by the CLKS field in burst mode automatically */
   if (Burst_Mode_Flag) {
       Chip_ADC_SetBurstCmd(_LPC_ADC_ID, ENABLE);
   }
   Interrupt_Continue_Flag = 1;
   ADC_Interrupt_Done_Flag = 1;
   while (Interrupt_Continue_Flag) {
       if (!Burst_Mode_Flag && ADC_Interrupt_Done_Flag) {
           ADC_Interrupt_Done_Flag = 0;
           Chip_ADC_SetStartMode(_LPC_ADC_ID, ADC_START_NOW, ADC_TRIGGERMODE_RISING);
       }
   }
   /* Disable burst mode if any */
   if (Burst_Mode_Flag) {
       Chip_ADC_SetBurstCmd(_LPC_ADC_ID, DISABLE);
   }
   /* Disable ADC interrupt */
   NVIC_DisableIRQ(_LPC_ADC_IRQ);
}

More details, please refer to the lpcopen code, or refer to my attached adc.c file.

If you still have question, please let me know!

Have a great day,
Kerry

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Re: LPC4330-Xplorer Development Board receiving the ADC values