rfivet/stm32bringup
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Use temperature formula from reference manual code example.

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This commit is contained in:
Renaud 2021-06-30 12:09:11 +08:00
parent e19475388d
commit a7cafdf989
2 changed files with 7 additions and 6 deletions
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8
adc.c
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@ -1,5 +1,5 @@
/* adc.c -- system layer /* adc.c -- system layer
** Copyright (c) 2020 Renaud Fivet ** Copyright (c) 2020-2021 Renaud Fivet
** **
** ADC for temperature sensor and Vrefint ** ADC for temperature sensor and Vrefint
** gpioa low level API and usleep() ** gpioa low level API and usleep()
@ -118,7 +118,7 @@
/** SYSTEM MEMORY *************************************************************/ /** SYSTEM MEMORY *************************************************************/
/* STM32F030 calibration addresses (at 3.3V and 30C) */ /* STM32F030 calibration addresses (at 3.3V and 30C) */
#define TS_CAL ((unsigned short *) 0x1FFFF7B8) #define TS_CAL1 ((unsigned short *) 0x1FFFF7B8)
#define VREFINT_CAL ((unsigned short *) 0x1FFFF7BA) #define VREFINT_CAL ((unsigned short *) 0x1FFFF7BA)
@ -298,7 +298,7 @@ void adc_vnt( vnt_cmd_t cmd, short *ptrV, short *ptrC) {
if( cmd <= VNT_CAL) { if( cmd <= VNT_CAL) {
/* Calibration Values */ /* Calibration Values */
*ptrV = *VREFINT_CAL ; *ptrV = *VREFINT_CAL ;
*ptrC = *TS_CAL ; *ptrC = *TS_CAL1 ;
return ; return ;
} }
@ -307,8 +307,8 @@ void adc_vnt( vnt_cmd_t cmd, short *ptrV, short *ptrC) {
*ptrV = adc_convert() ; *ptrV = adc_convert() ;
if( cmd == VNT_VNC) { if( cmd == VNT_VNC) {
*ptrC = 300 + (*TS_CAL1 - *ptrC * *VREFINT_CAL / *ptrV) * 10000 / 5336 ;
*ptrV = 330 * *VREFINT_CAL / *ptrV ; *ptrV = 330 * *VREFINT_CAL / *ptrV ;
*ptrC = 850 + (1500 - *ptrC) * 10 / 4 ;
} }
} }

5
adcmain.c
View File

@ -1,5 +1,5 @@
/* adcmain.c -- ADC reading of reference voltage and temperature sensor */ /* adcmain.c -- ADC reading of reference voltage and temperature sensor */
/* Copyright (c) 2020 Renaud Fivet */ /* Copyright (c) 2020-2021 Renaud Fivet */
#include <stdio.h> #include <stdio.h>
#include "system.h" #include "system.h"
@ -26,8 +26,9 @@ int main( void) {
#ifdef RAW #ifdef RAW
adc_vnt( VNT_RAW, &Vsample, &Csample) ; adc_vnt( VNT_RAW, &Vsample, &Csample) ;
printf( "%i, %i, %i, %i, ", calV, Vsample, calC, Csample) ; printf( "%i, %i, %i, %i, ", calV, Vsample, calC, Csample) ;
Csample = 300 + (calC - (int) Csample * calV / Vsample)
* 10000 / 5336 ;
Vsample = 330 * calV / Vsample ; Vsample = 330 * calV / Vsample ;
Csample = 850 + (1500 - (int) Csample) * 10 / 4 ;
#else #else
adc_vnt( VNT_VNC, &Vsample, &Csample) ; adc_vnt( VNT_VNC, &Vsample, &Csample) ;
#endif #endif