S32K116 ADC Continuos Mode Opearion with PDB Back to Back Trigger

[nimeshkumar_mod]

Hi,

I am able to get ADC data using one shot mode but we require ADC continuous mode operation. I tried to Implement that but didn't get any ADC Reading. Below i share my PDB ADC Back to Back One Shot Mode code.

void ADC_Init(void)
{
PCC->PCCn[PCC_ADC0_INDEX] &= ~PCC_PCCn_CGC_MASK; /* Disable clock to change PCS */
PCC->PCCn[PCC_ADC0_INDEX] |= PCC_PCCn_PCS(1); /* PCS=1: Select FIRC */
PCC->PCCn[PCC_ADC0_INDEX] |= PCC_PCCn_CGC_MASK; /* Enable bus clock in ADC */

ADC0->CFG1 |= ADC_CFG1_ADICLK(0) | /* Only ALTCLK1 is available */
                           ADC_CFG1_ADIV(0) | /* 16 MHz /1, 16MHZ clock is given as ADC input clock */
                           ADC_CFG1_MODE(0); /* 0b00: 8-bit, 0b01: 12-bit, 0b10: 10-bit */

ADC0->SC2 |= ADC_SC2_ADTRG(1); /* Conversion Trigger: 0b0= SW , 0b1 = HW */

ADC0->SC1[0] = ADC_SC1_ADCH(1); /* Select AD12 (ADC0_SE1) @PTA1 */
ADC0->SC1[1] = ADC_SC1_ADCH(3); /* Select AD12 (ADC0_SE3) @PTA7 */
ADC0->SC1[2] = ADC_SC1_ADCH(4); /* Select AD12 (ADC0_SE4) @PTB0 */
ADC0->SC1[3] = ADC_SC1_ADCH(5); /* Select AD12 (ADC0_SE5) @PTB1 */
ADC0->SC1[4] = ADC_SC1_ADCH(6); /* Select AD12 (ADC0_SE6) @PTB2 */
ADC0->SC1[5] = ADC_SC1_ADCH(7); /* Select AD12 (ADC0_SE7) @PTB3 */
ADC0->SC1[6] = ADC_SC1_ADCH(10); /* Select AD12 (ADC0_SE10) @PTC2 */
ADC0->SC1[7] = ADC_SC1_ADCH(11); /* Select AD12 (ADC0_SE11) @PTC3 */

}

void PDB_Init(void)
{
PCC->PCCn[PCC_PDB0_INDEX] |= PCC_PCCn_CGC_MASK; /* Enable bus clock in PDB0 */

PDB0->SC |= PDB_SC_TRGSEL(0xF) | /* b1111: Software trigger is selected */
                        PDB_SC_PRESCALER(1) | /* Prescaler: 010 = per.clck/(4*MULT) = 80 / (4*1) = 20MHz */
                        PDB_SC_PDBIE(1) | /* PDB interrupt enabled */
                        PDB_SC_MULT(0) | /* 00: Multiplication factor is 1. */
                        PDB_SC_CONT(1) | /* Continuous mode of operation */
                        PDB_SC_PDBEN_MASK; /* 1: PDB enabled */

PDB0->CH[0].C1 |= PDB_C1_BB(0xFE) | // For Continuos Pre-Trigger Mode

                                 PDB_C1_TOS(0x00) | // Pretrigger Output Select: 0=bypassed , 1=enabled
                                 PDB_C1_EN(0xFF); // PDB channel's pre-trigger enabled

PDB0->MOD = 500; /* Specifies the period of the counter as 5000 */
PDB0->IDLY = 400; /* Specifies the delay value to schedule the PDB interrupt as 4000 */
// PDB0->CH[0].DLY[0] = 1; /* Pretrigger 0 : 1 * 50e-9 = 50e-9 */
// PDB0->CH[0].DLY[1] = 1; /* Pretrigger 0 : 1 * 50e-9 = 50e-9 */

PDB0->SC |= PDB_SC_LDOK_MASK;

//Enable_Interrupt(PDB0_IRQn);
PDB0_IRQ_Init();

PDB0->SC |= PDB_SC_SWTRIG_MASK; /* restart PDB counter */
}

void PDB0_IRQ_Init (void)
{
S32_NVIC->ICPR = 1 << PDB0_IRQn; /* IRQ11-FlexCAN ch0: clr any pending IRQ*/
S32_NVIC->ISER = 1 << PDB0_IRQn; /* IRQ11-FlexCAN ch0: enable IRQ */
S32_NVIC->IP[PDB0_IRQn] = 0x09; /* IRQ11-FlexCAN ch0: priority 10 of 0-15*/
}

void PDB0_IRQHandler(void)
{
   if( ( PDB0->SC & PDB_SC_PDBIF_MASK ) != 0 )
   {
      PDB0->SC &= ~PDB_SC_PDBIF_MASK; /* Write zero to clear PDBIF */

      PTE->PTOR |= 1 <<8; /* Toggle output on port D0 (blue LED) */

       ADC_U8_Int_Result[ADC_U8_ANI0] = ADC0->R[0];
      ADC_U8_Int_Result[ADC_U8_ANI1] = ADC0->R[1];
      ADC_U8_Int_Result[ADC_U8_ANI2] = ADC0->R[2];
      ADC_U8_Int_Result[ADC_U8_ANI3] = ADC0->R[3];
      ADC_U8_Int_Result[ADC_U8_ANI4] = ADC0->R[4];
      ADC_U8_Int_Result[ADC_U8_ANI5] = ADC0->R[5];
      ADC_U8_Int_Result[ADC_U8_ANI6] = ADC0->R[6];
      ADC_U8_Int_Result[ADC_U8_ANI7] = ADC0->R[7];

   PDB0->SC |= PDB_SC_SWTRIG_MASK; /* restart PDB counter */
   }

}

From This code i am able to get ADC Data But need to give PDB Software Trigger Every time Interrupt called. I need ADC Continuous Mode Operation so no need to give PDB SW Trigger Every time and When needed able to get ADC Reading. SO what changes should i made in this code. I tried with "PDB0->CH[0].C1 |= PDB_C1_BB(0xFF)" But not able to get ADC Reading.

Thanks&Regards,

Nimesh

[dianabatrlova]

Hi Nimesh,

I tried using PDB continuous mode on this example Example S32K144 PDB ADC back-to-back test S32DS12 with some changes like PDB_C1_TOS(0x01) | // Pretrigger Output Select: 0=bypassed , 1=enabled and it seems to be working with changes in the main.c (attached)

I hope it helps.

Best regards,

Diana

[bjrajendra]

Hi Diana,

I tried using your code & made a few changes like below since I'm reading 8 ADC channels. But the if() condition is not becoming TRUE. Kindly suggest anything else need to be changed.

if(ADC0->SC1[7] & ADC_SC1_COCO_MASK)
{
/* read converted data */
result0 = ADC0->R[0];
result1 = ADC0->R[1];
result2 = ADC0->R[2];
result3 = ADC0->R[3];
result4 = ADC0->R[4];
result5 = ADC0->R[5];
result6 = ADC0->R[6];
result7 = ADC0->R[7];

PDB0->SC |= PDB_SC_SWTRIG_MASK; /* restart PDB counter again */
}