S12XE ATD on 16 Channels

rayhall — Wed, 10 Aug 2016 08:16:44 GMT

I am using the 205 pin BGA version of the S12XE with a bus clock of 50 Mhz and the ATD clock at 1 Mhz.

I cannot get the ATD to read values in channels 8 to 15. I have no problem with 0 to 7 channels. Below is my code.

Ray.

void Init_ATD0(void) {

ATD0CTL1 = 0B00110000;

//ETRIGSEL - External Trigger Source Select

//SRES[1:0] - A/D Resolution Select

//SMP_DIS - Discharge Before Sampling Bit

//ETRIGCH[3:0] - External Trigger Channel Select

ATD0CTL2 = 0B01000010;

//Reserved

//AFFC - ATD Fast Flag Clear All

//ICLKSTP - Internal Clock in Stop Mode Bit

//ETRIGLE - External Trigger Level/Edge Control

//ETRIGP - External Trigger Polarity

//ETRIGE - External Trigger Mode Enable

//ASCIE - ATD Sequence Complete Interrupt Enable

//ACMPIE - ATD Compare Interrupt Enable

ATD0CTL3 = 0B11000000;

//DJM - Result Register Data Justification (Right Justified)

//S8C, S4C, S2C, S1C - Converison Sequence Length (8)

//FIFO - Result Register FIFO Mode (0)

//FRZ[1:0] - Background Debug Freeze Enable (Finish current converison, then freeze)

ATD0CTL4 = 0B01011111;

//SMP[2:0] - Sample Time Select (8)

//PRS[4:0] - ATD Clock Prescaler (ATD clock 1MHz with 50 MHz bus)

ATD0CTL5 = 0B00110000;//start continuous conversion

//Reserved

//SC - Special Channel Conversion Bit

//SCAN - Continuous or Single conversion sequence (Continuous)

//MULT - Multi-Channel Sample Mode (multichannel)

//CD, CC, CB, CA - Analog Input Channel Select Code (channel AN0)

}

#define ADC_ARRAY 18

volatile uint16_t adcVal[ADC_ARRAY];

//-------------------------- ATD0 Interrupt ------------------------------

interrupt void ATD0_ISR(void) {

adcVal[0] = ATD0DR0;

adcVal[1] = ATD0DR1;

adcVal[2] = ATD0DR2;

adcVal[3] = ATD0DR3;

adcVal[4] = ATD0DR4;

adcVal[5] = ATD0DR5;

adcVal[6] = ATD0DR6;

adcVal[7] = ATD0DR7;

adcVal[8] = ATD0DR8;

adcVal[9] = ATD0DR9;

adcVal[10] = ATD0DR10;

adcVal[11] = ATD0DR11;

adcVal[12] = ATD0DR12;

adcVal[13] = ATD0DR13;

adcVal[14] = ATD0DR14;

adcVal[15] = ATD0DR15;

}

Re: S12XE ATD on 16 Channels

rayhall — Thu, 11 Aug 2016 06:50:21 GMT

These are the correct settings to read from 16 channels.

Ray

void Init_ATD0(void) {

ATD0CTL1 = 0x30; // 10bit, Discharge before sample

ATD0CTL2 = 0x42; // Fast Flag Clear All, Complete Interrupt Enable

ATD0CTL3 = 0x80; // Right Justified, Converison Sequence Length (16)

ATD0CTL4 = 0x58; // Sample Time Select 8, ATD clock 1MHz with 50 MHz bus

ATD0CTL5 = 0x30; // Continuous conversion sequence, Multi-Channel

}

Re: S12XE ATD on 16 Channels

iggi — Thu, 11 Aug 2016 07:12:28 GMT

I just wanted to tell you that Conversion Sequence Length you set to 8 initially should be changed to 16 :-)

S12 / MagniV MicrocontrollersのトピックRe: S12XE ATD on 16 Channels

S12XE ATD on 16 Channels

Re: S12XE ATD on 16 Channels

Re: S12XE ATD on 16 Channels