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Fix incorrect Vref calibration

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The formula used to compute VREF from VREFINT and VREFINTCAL was incorrect.

Also, as correct formulae for VREF and TEMPSENSOR incorporate lots of
MCU dependent variables and constants, a new driver level service was
added to convert ADC values to VREF voltage or temperature.
This commit is contained in:
jflyper 2019-07-21 02:09:39 +09:00
parent d8b74db2dc
commit 9d7cfb1e79
6 changed files with 71 additions and 37 deletions
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44
src/main/drivers/adc_impl.h
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@ -80,6 +80,13 @@ typedef struct adcDevice_s {
#endif
} adcDevice_t;
#ifdef USE_ADC_INTERNAL
extern int32_t adcVREFINTCAL; // ADC value (12-bit) of band gap with Vref = VREFINTCAL_VREF
extern int32_t adcTSCAL1;
extern int32_t adcTSCAL2;
extern int32_t adcTSSlopeK;
#endif
extern const adcDevice_t adcHardware[];
extern const adcTagMap_t adcTagMap[ADC_TAG_MAP_COUNT];
extern adcOperatingConfig_t adcOperatingConfig[ADC_CHANNEL_COUNT];
@ -92,3 +99,40 @@ bool adcVerifyPin(ioTag_t tag, ADCDevice device);
// Marshall values in DMA instance/channel based order to adcChannel based order.
// Required for multi DMA instance implementation
void adcGetChannelValues(void);
//
// VREFINT and TEMPSENSOR related definitions
// These are shared among common adc.c and MCU dependent adc_stm32XXX.c
//
#ifdef STM32F7
// STM32F7 HAL library V1.12.0 defines VREFINT and TEMPSENSOR in stm32f7xx_ll_adc.h,
// which is not included from stm32f7xx_hal_adc.h
// We manually copy required lines here.
// XXX V1.14.0 may solve this problem
#define VREFINT_CAL_VREF ( 3300U) /* Analog voltage reference (Vref+) value with which temperature sensor has been calibrated in production (tolerance: +-10 mV) (unit: mV). */
#define TEMPSENSOR_CAL1_TEMP (( int32_t) 30) /* Internal temperature sensor, temperature at which temperature sensor has been calibrated in production for data into TEMPSENSOR_CAL1_ADDR (tolerance: +-5 DegC) (unit: DegC). */
#define TEMPSENSOR_CAL2_TEMP (( int32_t) 110) /* Internal temperature sensor, temperature at which temperature sensor has been calibrated in production for data into TEMPSENSOR_CAL2_ADDR (tolerance: +-5 DegC) (unit: DegC). */
#define TEMPSENSOR_CAL_VREFANALOG ( 3300U) /* Analog voltage reference (Vref+) voltage with which temperature sensor has been calibrated in production (+-10 mV) (unit: mV). */
// These addresses are incorrectly defined in stm32f7xx_ll_adc.h
#if defined(STM32F745xx) || defined(STM32F746xx) || defined(STM32F765xx)
// F745xx_F746xx and F765xx_F767xx_F769xx
#define VREFINT_CAL_ADDR ((uint16_t*) (0x1FF0F44A))
#define TEMPSENSOR_CAL1_ADDR ((uint16_t*) (0x1FF0F44C))
#define TEMPSENSOR_CAL2_ADDR ((uint16_t*) (0x1FF0F44E))
#elif defined(STM32F722xx)
// F72x_F73x
#define VREFINT_CAL_ADDR ((uint16_t*) (0x1FF07A2A))
#define TEMPSENSOR_CAL1_ADDR ((uint16_t*) (0x1FF07A2C))
#define TEMPSENSOR_CAL2_ADDR ((uint16_t*) (0x1FF07A2E))
#endif
#endif // STM32F7
#ifdef STM32F4
// STM32F4 stdlib does not define any of these
#define VREFINT_CAL_VREF (3300U)
#define TEMPSENSOR_CAL_VREFANALOG (3300U)
#define TEMPSENSOR_CAL1_TEMP ((int32_t) 30)
#define TEMPSENSOR_CAL2_TEMP ((int32_t) 110)
#endif