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feat(Examples): Add Ref Trim procedure to MAX32690 ADC Example (#841)
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@BrentK-ADI
BrentK-ADI authored Dec 21, 2023
1 parent 1ffe046 commit 1a6e1dc
Showing 1 changed file with 210 additions and 2 deletions.
212 changes: 210 additions & 2 deletions Examples/MAX32690/ADC/main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -28,11 +28,12 @@
/***** Includes *****/
#include <stdio.h>
#include <stdint.h>

#include "mxc_device.h"
#include "mxc_delay.h"
#include "mxc_errors.h"
#include "adc.h"
#include "dma.h"
#include "fcr_regs.h"
#include "led.h"
#include "tmr.h"

Expand All @@ -42,6 +43,8 @@
// #define INTERRUPT // Uncomment to perform ADC conversions using interrupt driven method
// #define DMA // Uncomment to perform ADC conversions using DMA driven method.

#define REF_TRIM //Uncomment to perform the reference trim after initialization

#define SOFTWARE // Uncomment to perform ADC conversions using a software trigger
// #define HARDWARE // Uncomment to perform ADC conversions using a hardware trigger

Expand All @@ -62,6 +65,13 @@ volatile unsigned int adc_done = 0;
volatile unsigned int dma_done = 0;
#endif

#ifdef REF_TRIM
//These values are dependent on the sample rate of the ADC. For 250ksps, the
//values are below. See table 11-4 in the user guide for other sample rates
#define TRIM_BIAS_COUNT 5
#define TRIM_WAKE_COUNT 3
#endif

/* Temperature Sensor firmware average*/
#define SAMPLE_AVG 16
float TEMP_SAMPLES[SAMPLE_AVG] = {};
Expand Down Expand Up @@ -168,6 +178,190 @@ void StartHWTriggerTimer(void)
}
#endif

#ifdef REF_TRIM
/* Performs the 1.25V Internal Reference Trim
* Derived from UG7618 Section 11.6.3 - 1.25V Internal Reference Trim
*/
void adc_internal_1v25_ref_trim()
{
uint32_t tempData;

//Enter nap state
MXC_ADC->ctrl0 &= ~MXC_F_ADC_CTRL0_ADC_EN;

//Clear Skip Cal
MXC_ADC->ctrl0 &= ~MXC_F_ADC_CTRL0_SKIP_CAL;

MXC_ADC->sfraddr = 0x0B;
tempData = MXC_ADC->sfrrddata;
tempData &= 0xC0;
tempData |= ((MXC_FCR->adcreftrim0 & MXC_F_FCR_ADCREFTRIM0_VX2_TUNE) >>
MXC_F_FCR_ADCREFTRIM0_VX2_TUNE_POS);
MXC_ADC->sfrwrdata = tempData;

MXC_ADC->sfraddr = 0x0C;
tempData = ((MXC_FCR->adcreftrim2 & MXC_F_FCR_ADCREFTRIM2_IBOOST_1P25) >>
MXC_F_FCR_ADCREFTRIM2_IBOOST_1P25_POS)
<< 7;
tempData |=
((MXC_FCR->adcreftrim0 & MXC_F_FCR_ADCREFTRIM0_VREFP) >> MXC_F_FCR_ADCREFTRIM0_VREFP_POS);
MXC_ADC->sfrwrdata = tempData;

MXC_ADC->sfraddr = 0x0D;
tempData = MXC_ADC->sfrrddata;
tempData &= 0x80;
tempData |=
((MXC_FCR->adcreftrim0 & MXC_F_FCR_ADCREFTRIM0_VREFM) >> MXC_F_FCR_ADCREFTRIM0_VREFM_POS);
MXC_ADC->sfrwrdata = tempData;

MXC_ADC->sfraddr = 0x0E;
tempData = MXC_ADC->sfrrddata;
tempData &= 0x0C;
tempData |= ((MXC_FCR->adcreftrim2 & MXC_F_FCR_ADCREFTRIM2_IDRV_1P25) >>
MXC_F_FCR_ADCREFTRIM2_IDRV_1P25_POS)
<< 4;
tempData |=
((MXC_FCR->adcreftrim0 & MXC_F_FCR_ADCREFTRIM0_VCM) >> MXC_F_FCR_ADCREFTRIM0_VCM_POS);
MXC_ADC->sfrwrdata = tempData;

MXC_ADC->sfraddr = 0x05;
tempData = MXC_ADC->sfrrddata;
tempData &= 0xF0;
tempData |= TRIM_BIAS_COUNT;
MXC_ADC->sfrwrdata = tempData;

MXC_ADC->sfraddr = 0x06;
tempData = MXC_ADC->sfrrddata;
tempData &= 0xF0;
tempData |= TRIM_WAKE_COUNT;
MXC_ADC->sfrwrdata = tempData;

//Enable
MXC_ADC->ctrl0 |= MXC_F_ADC_CTRL0_ADC_EN;

//Wait for 30us
MXC_Delay(30);

//wait for calibration to complete
while (!(MXC_ADC->intfl & MXC_F_ADC_INTFL_READY)) {}
}

/* Performs the 2.048V Internal Reference Trim
* Derived from UG7618 Section 11.6.4 - 2.048V Internal Reference Trim
*/
void adc_internal_2v048_ref_trim()
{
uint32_t tempData;

//Enter nap state
MXC_ADC->ctrl0 &= ~MXC_F_ADC_CTRL0_ADC_EN;

//Clear Skip Cal
MXC_ADC->ctrl0 &= ~MXC_F_ADC_CTRL0_SKIP_CAL;

MXC_ADC->sfraddr = 0x0B;
tempData = MXC_ADC->sfrrddata;
tempData &= 0xC0;
tempData |= ((MXC_FCR->adcreftrim1 & MXC_F_FCR_ADCREFTRIM1_VX2_TUNE) >>
MXC_F_FCR_ADCREFTRIM1_VX2_TUNE_POS);
MXC_ADC->sfrwrdata = tempData;

MXC_ADC->sfraddr = 0x0C;
tempData = ((MXC_FCR->adcreftrim2 & MXC_F_FCR_ADCREFTRIM2_IBOOST_2P048) >>
MXC_F_FCR_ADCREFTRIM2_IBOOST_2P048_POS)
<< 7;
tempData |=
((MXC_FCR->adcreftrim1 & MXC_F_FCR_ADCREFTRIM1_VREFP) >> MXC_F_FCR_ADCREFTRIM1_VREFP_POS);
MXC_ADC->sfrwrdata = tempData;

MXC_ADC->sfraddr = 0x0D;
tempData = MXC_ADC->sfrrddata;
tempData &= 0x80;
tempData |=
((MXC_FCR->adcreftrim1 & MXC_F_FCR_ADCREFTRIM1_VREFM) >> MXC_F_FCR_ADCREFTRIM1_VREFM_POS);
MXC_ADC->sfrwrdata = tempData;

MXC_ADC->sfraddr = 0x0E;
tempData = MXC_ADC->sfrrddata;
tempData &= 0x0C;
tempData |= ((MXC_FCR->adcreftrim2 & MXC_F_FCR_ADCREFTRIM2_IDRV_2P048) >>
MXC_F_FCR_ADCREFTRIM2_IDRV_2P048_POS)
<< 4;
tempData |=
((MXC_FCR->adcreftrim1 & MXC_F_FCR_ADCREFTRIM1_VCM) >> MXC_F_FCR_ADCREFTRIM1_VCM_POS);
MXC_ADC->sfrwrdata = tempData;

MXC_ADC->sfraddr = 0x05;
tempData = MXC_ADC->sfrrddata;
tempData &= 0xF0;
tempData |= TRIM_BIAS_COUNT;
MXC_ADC->sfrwrdata = tempData;

MXC_ADC->sfraddr = 0x06;
tempData = MXC_ADC->sfrrddata;
tempData &= 0xF0;
tempData |= TRIM_WAKE_COUNT;
MXC_ADC->sfrwrdata = tempData;

//Enable
MXC_ADC->ctrl0 |= MXC_F_ADC_CTRL0_ADC_EN;

//Wait for 30us
MXC_Delay(30);

//wait for calibration to complete
while (!(MXC_ADC->intfl & MXC_F_ADC_INTFL_READY)) {}
}

/* Performs the External Reference Trim
* Derived from UG7618 Section 11.6.5 - External Reference Trim
*/
void adc_external_ref_trim()
{
uint32_t tempData;

//Enter nap state
MXC_ADC->ctrl0 &= ~MXC_F_ADC_CTRL0_ADC_EN;

//Clear Skip Cal
MXC_ADC->ctrl0 &= ~MXC_F_ADC_CTRL0_SKIP_CAL;

MXC_ADC->sfraddr = 0x0B;
tempData = MXC_ADC->sfrrddata;
tempData &= 0x80;
tempData |= ((MXC_FCR->adcreftrim2 & MXC_F_FCR_ADCREFTRIM2_VX2_TUNE) >>
MXC_F_FCR_ADCREFTRIM2_VX2_TUNE_POS);
MXC_ADC->sfrwrdata = tempData;

MXC_ADC->sfraddr = 0x0E;
tempData = MXC_ADC->sfrrddata;
tempData |=
((MXC_FCR->adcreftrim2 & MXC_F_FCR_ADCREFTRIM2_VCM) >> MXC_F_FCR_ADCREFTRIM2_VCM_POS);
MXC_ADC->sfrwrdata = tempData;

MXC_ADC->sfraddr = 0x05;
tempData = MXC_ADC->sfrrddata;
tempData &= 0xF0;
tempData |= TRIM_BIAS_COUNT;
MXC_ADC->sfrwrdata = tempData;

MXC_ADC->sfraddr = 0x06;
tempData = MXC_ADC->sfrrddata;
tempData &= 0xF0;
tempData |= TRIM_WAKE_COUNT;
MXC_ADC->sfrwrdata = tempData;

//Enable
MXC_ADC->ctrl0 |= MXC_F_ADC_CTRL0_ADC_EN;

//Wait for 30us
MXC_Delay(30);

//wait for calibration to complete
while (!(MXC_ADC->intfl & MXC_F_ADC_INTFL_READY)) {}
}

#endif
/*ADC initialization*/
void adc_init(void)
{
Expand All @@ -178,13 +372,27 @@ void adc_init(void)
adc_cfg.cal = MXC_ADC_EN_CAL;
adc_cfg.trackCount = 4;
adc_cfg.idleCount = 17;
adc_cfg.ref = MXC_ADC_REF_INT_2V048;
adc_cfg.ref = MXC_ADC_REF_INT_1V25;

/* Initialize ADC */
if (MXC_ADC_Init(&adc_cfg) != E_NO_ERROR) {
printf("Error Bad Parameter\n");
while (1) {}
}

#ifdef REF_TRIM
switch (adc_cfg.ref) {
case MXC_ADC_REF_INT_1V25:
adc_internal_1v25_ref_trim();
break;
case MXC_ADC_REF_INT_2V048:
adc_internal_2v048_ref_trim();
break;
case MXC_ADC_REF_EXT:
adc_external_ref_trim();
break;
}
#endif
}

/* Single channel */
Expand Down

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