Revision 0:ab323c9b71db, committed 2016-03-31

Comitter:

sixBase3

Date:

Thu Mar 31 15:52:25 2016 +0000

Commit message:

Demonstration of how to read internal ADC channels in STM micros using STM HAL library. F446 chosen

Changed in this revision

diff -r 000000000000 -r ab323c9b71db main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Mar 31 15:52:25 2016 +0000
@@ -0,0 +1,62 @@
+#include "mbed.h"
+
+//mbed Declaration left here as example 
+AnalogIn analog_value(A0);
+
+DigitalOut led(LED1);
+
+//ST HAL For ADC since we want to access the internal channels
+ADC_HandleTypeDef hadc1;
+
+int main() {
+    float meas;
+    
+    ADC_ChannelConfTypeDef sConfig;  //Declare the ST HAL ADC object
+    
+    /**Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion) 
+    */
+    hadc1.Instance = ADC1;
+    hadc1.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV4;
+    hadc1.Init.Resolution = ADC_RESOLUTION12b;
+    hadc1.Init.ScanConvMode = DISABLE;
+    hadc1.Init.ContinuousConvMode = DISABLE;
+    hadc1.Init.DiscontinuousConvMode = DISABLE;
+    hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
+    hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
+    hadc1.Init.NbrOfConversion = 1;
+    hadc1.Init.DMAContinuousRequests = DISABLE;
+    hadc1.Init.EOCSelection = EOC_SINGLE_CONV;
+    HAL_ADC_Init(&hadc1);   //Go turn on the ADC
+    
+    sConfig.Channel = ADC_CHANNEL_TEMPSENSOR; //ADC_CHANNEL_VREFINT, ADC_CHANNEL_VBAT
+    sConfig.Rank = 1;
+    sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
+
+    printf("\nAnalogIn example\n");
+    
+    while(1) {
+        meas = analog_value.read(); // Converts and read the analog input value (value from 0.0 to 1.0)
+        meas = meas * 3300; // Change the value to be in the 0 to 3300 range
+        printf("A0 input: measure = %.0f mV\n", meas);
+        if (meas > 2000) { // If the value is greater than 2V then switch the LED on
+          led = 1;
+        }
+        else {
+          led = 0;
+        }
+        wait(0.2); // 200 ms
+
+//Now go read the STM internal channel selected above
+        HAL_ADC_ConfigChannel(&hadc1, &sConfig);
+        HAL_ADC_Start(&hadc1); // Start conversion
+    
+        // Wait end of conversion and get value
+        if (HAL_ADC_PollForConversion(&hadc1, 10) == HAL_OK) {
+            uint16_t value = HAL_ADC_GetValue(&hadc1);
+            printf("Internal Channel Value = %04X\n\r",value);
+        } else {
+            error("Conversion Error");
+        }
+
+    }
+}

diff -r 000000000000 -r ab323c9b71db mbed-dev.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-dev.lib	Thu Mar 31 15:52:25 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed-dev/#5ce70d0cf6ae