tom dunigan / Mbed 2 deprecated leo_adc_internal

F446RE ADC internal channels test: VREF, VBAT, temp sensor

Dependencies:   mbed

F446RE ADC internal channels test: VREF, VBAT, temp sensor

main.cpp@1:709e8e98f880, 2015-11-13 (annotated)

Committer:
manitou
Date:
Fri Nov 13 11:56:15 2015 +0000
Revision:
1:709e8e98f880
Parent:
0:0e42d22824a3 
VBAT divider is 4, ref 13.11

Who changed what in which revision?

UserRevisionLine numberNew contents of line
manitou 0:0e42d22824a3 1 // access F446RE internal ADC channels temp sensor, VBAT, VREF
manitou 0:0e42d22824a3 2 // based on pyboard implementation and analogin_api.c
manitou 0:0e42d22824a3 3 // VBAT and temp are both channel 18, vref channel 17
manitou 0:0e42d22824a3 4 #include "mbed.h"
manitou 0:0e42d22824a3 5
manitou 0:0e42d22824a3 6 #define PRREG(z) printf(#z" 0x%x\n",z)
manitou 0:0e42d22824a3 7
manitou 0:0e42d22824a3 8 #define CORE_TEMP_V25 (4096*.76/3.3) // (0.76v/3.3v)*(2^ADC resoultion)
manitou 0:0e42d22824a3 9 #define CORE_TEMP_AVG_SLOPE (4096*.0025/3.3) // (2.5mv/3.3v)*(2^ADC resoultion)
manitou 0:0e42d22824a3 10
manitou 1:709e8e98f880 11 // VBAT to ADC goes through divider /4 ref 13.11
manitou 0:0e42d22824a3 12 #define VBAT_DIV (4)
manitou 0:0e42d22824a3 13
manitou 0:0e42d22824a3 14
manitou 0:0e42d22824a3 15 static ADC_HandleTypeDef AdcHandle;
manitou 0:0e42d22824a3 16
manitou 0:0e42d22824a3 17 void adc_init() {
manitou 0:0e42d22824a3 18 // Enable ADC clock
manitou 0:0e42d22824a3 19 __ADC1_CLK_ENABLE();
manitou 0:0e42d22824a3 20
manitou 0:0e42d22824a3 21 // Configure ADC
manitou 0:0e42d22824a3 22 AdcHandle.Instance = (ADC_TypeDef *)ADC1;
manitou 0:0e42d22824a3 23 AdcHandle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV2;
manitou 0:0e42d22824a3 24 AdcHandle.Init.Resolution = ADC_RESOLUTION12b;
manitou 0:0e42d22824a3 25 AdcHandle.Init.ScanConvMode = DISABLE;
manitou 0:0e42d22824a3 26 AdcHandle.Init.ContinuousConvMode = DISABLE;
manitou 0:0e42d22824a3 27 AdcHandle.Init.DiscontinuousConvMode = DISABLE;
manitou 0:0e42d22824a3 28 AdcHandle.Init.NbrOfDiscConversion = 0;
manitou 0:0e42d22824a3 29 AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
manitou 0:0e42d22824a3 30 AdcHandle.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
manitou 0:0e42d22824a3 31 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
manitou 0:0e42d22824a3 32 AdcHandle.Init.NbrOfConversion = 1;
manitou 0:0e42d22824a3 33 AdcHandle.Init.DMAContinuousRequests = DISABLE;
manitou 0:0e42d22824a3 34 AdcHandle.Init.EOCSelection = DISABLE;
manitou 0:0e42d22824a3 35 HAL_ADC_Init(&AdcHandle);
manitou 0:0e42d22824a3 36 }
manitou 0:0e42d22824a3 37
manitou 0:0e42d22824a3 38 uint16_t adc_read_channel(uint32_t channel) {
manitou 0:0e42d22824a3 39 ADC_ChannelConfTypeDef sConfig;
manitou 0:0e42d22824a3 40 sConfig.Channel = channel;
manitou 0:0e42d22824a3 41 sConfig.Rank = 1;
manitou 0:0e42d22824a3 42 sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
manitou 0:0e42d22824a3 43 sConfig.Offset = 0;
manitou 0:0e42d22824a3 44 HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
manitou 0:0e42d22824a3 45
manitou 0:0e42d22824a3 46 HAL_ADC_Start(&AdcHandle); // Start conversion
manitou 0:0e42d22824a3 47
manitou 0:0e42d22824a3 48 // Wait end of conversion and get value
manitou 0:0e42d22824a3 49 if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
manitou 0:0e42d22824a3 50 return (HAL_ADC_GetValue(&AdcHandle));
manitou 0:0e42d22824a3 51 } else {
manitou 0:0e42d22824a3 52 return 0;
manitou 0:0e42d22824a3 53 }
manitou 0:0e42d22824a3 54 }
manitou 0:0e42d22824a3 55
manitou 0:0e42d22824a3 56 int main() {
manitou 0:0e42d22824a3 57 uint16_t val;
manitou 0:0e42d22824a3 58 float tempc, Vbat, Vcc;
manitou 0:0e42d22824a3 59
manitou 0:0e42d22824a3 60 printf("\nSystemCoreClock %d %s %s\n",SystemCoreClock,__TIME__,__DATE__);
manitou 0:0e42d22824a3 61 adc_init();
manitou 0:0e42d22824a3 62
manitou 0:0e42d22824a3 63 val = adc_read_channel(ADC_CHANNEL_VBAT);
manitou 0:0e42d22824a3 64 Vbat = 3.3*VBAT_DIV*val/4096;
manitou 0:0e42d22824a3 65 printf("%d Vbat %.2f\n",val,Vbat);
manitou 0:0e42d22824a3 66 ADC->CCR=0; // clear CCR to avoid conflicting use
manitou 0:0e42d22824a3 67 val = adc_read_channel(ADC_CHANNEL_TEMPSENSOR);
manitou 0:0e42d22824a3 68 tempc = ((val - CORE_TEMP_V25) / CORE_TEMP_AVG_SLOPE) + 25.;
manitou 0:0e42d22824a3 69 printf("%d %.1f C\n",val, tempc);
manitou 0:0e42d22824a3 70 val = adc_read_channel(ADC_CHANNEL_VREFINT);
manitou 0:0e42d22824a3 71 Vcc = 4095*1.21/val;
manitou 0:0e42d22824a3 72 printf("%d Vcc %.2f\n",val,Vcc);
manitou 0:0e42d22824a3 73
manitou 0:0e42d22824a3 74 PRREG(ADC1->CR1);
manitou 0:0e42d22824a3 75 PRREG(ADC1->CR2);
manitou 0:0e42d22824a3 76 PRREG(ADC->CCR);
manitou 0:0e42d22824a3 77
manitou 0:0e42d22824a3 78 }