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ADC internal channels read example.
Dependencies: mbed
Diff: main.cpp
- Revision:
- 4:e784c25594d7
- Parent:
- 3:5467a013d0a0
- Child:
- 6:3e184b0bcc33
diff -r 5467a013d0a0 -r e784c25594d7 main.cpp --- a/main.cpp Mon Nov 21 13:59:38 2016 +0000 +++ b/main.cpp Thu Nov 24 08:52:42 2016 +0000 @@ -1,38 +1,25 @@ #include "mbed.h" -#define VREF 3300.0f /* VRef in mV */ +/* + This basic example just shows how to read the ADC internal channels raw values. + Please look in the corresponding device reference manual for a complete + description of how to make a temperature sensor, VBat or Vref measurement. +*/ -// Parameters for temperature sensor only -#define AMBIENT_TEMP 25.0f /* Ambient Temperature in °C */ -#define V25 760.0f /* VSENSE value in mV at ambient temperature (see product datasheet) */ -#define AVG_SLOPE 2.5f /* Average slope in mV/°C (see product datasheet) */ - -AnalogIn vbat(ADC_VBAT); // To measure VBat -AnalogIn tempsensor(ADC_TEMP); // To measure Temperature sensor +AnalogIn adc_temp(ADC_TEMP); +AnalogIn adc_vref(ADC_VREF); +AnalogIn adc_vbat(ADC_VBAT); // Warning: Not available on all devices DigitalOut led(LED1); int main() { - float meas_f; - float JTemp_f; - - printf("\nSTM32 Internal Channels example\n"); - + printf("\nSTM32 ADC internal channels reading example\n"); while(1) { - - // Measure VBat - // Note: As VBAT voltage could be higher than VDDA, to ensure the correct operation of the ADC, the - // VBAT pin is internally connected to a bridge divider by 4. - printf("\nVBat = %.1f mV\n", vbat.read() * VREF * 4); - - // Measure temperature sensor - meas_f = tempsensor.read(); - // Compute the Junction Temperature value: JTemp = ((Vsens - V25)/Avg_Slope) + 25°C - JTemp_f = (((meas_f * VREF) - V25) / AVG_SLOPE) + AMBIENT_TEMP; - - printf("Internal Temperature = %.1f degree C\n", JTemp_f); - + printf("ADC Temp = %f\n", adc_temp.read()); + printf("ADC VRef = %f\n", adc_vref.read()); + printf("ADC VBat = %f\n", adc_vbat.read()); + printf("\033[3A"); led = !led; wait(1.0); }