Honza T.
Simple test program to get familiar with functionality of MBED RTOS on ST Nucleo-F411RE. Tasks for LED blinking, user button, temperature measurement with DS1620, temperature measurement with internal temperature sensor of ST32F411RE, ultrasonic distance measurement and displaying result on 16x2 TextLCD.
Dependencies: DS1620_improved TextLCD_improved mbed-rtos mbed
Diff: tsk_inttemp.cpp
- Revision:
- 17:94c385ff2641
- Child:
- 18:be0130c42925
diff -r cfb774e3e7fc -r 94c385ff2641 tsk_inttemp.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tsk_inttemp.cpp Fri Dec 18 15:23:21 2015 +0000
@@ -0,0 +1,73 @@
+#include "mbed.h"
+#include "rtos.h"
+#include "stm32f411xe.h"
+
+#include "tsk_main.h"
+#include "tsk_inttemp.h"
+
+
+struct int_temp_data_struct int_temp_data = { 0 };
+
+
+uint32_t initIntTemp(void const *args) {
+
+ int_temp_data.temperature = 0.0f;
+
+ //enable ADC1 clock
+ SET_BIT(RCC->APB2ENR, RCC_APB2ENR_ADC1EN);
+
+ // ADC on
+ SET_BIT(ADC1->CR2, ADC_CR2_ADON);
+ CLEAR_BIT(ADC1->CR2, ADC_CR2_CONT);
+
+ // Temp sensor on
+ CLEAR_BIT(ADC->CCR, ADC_CCR_VBATE);
+ SET_BIT(ADC->CCR, ADC_CCR_TSVREFE);
+
+ CLEAR_BIT(ADC1->CR1, ADC_CR1_RES);
+
+ return 1;
+}
+
+static uint16_t getADCTemp() {
+ // Set channel
+ ADC1->SQR1 &= ~ADC_SQR1_L; // Count = 1
+ ADC1->SQR3 |= ADC_SQR3_SQ1 & 18;
+
+ // Start conversion
+ SET_BIT(ADC1->CR2, ADC_CR2_SWSTART);
+
+ // Wait for completion
+ while (!READ_BIT(ADC1->SR, ADC_SR_EOC))
+ ;
+
+ // Return result
+ return READ_REG(ADC1->DR);
+}
+
+
+void inttemp_thread(void const *args) {
+
+ const float V25 = 943.3212f;// when V25=1.41V at ref 3.3V (0,76V)
+ const float Avg_Slope = 3.1030303f; //when avg_slope=4.3mV/C at ref 3.3V (2.5mV/C)
+ const uint16_t bufferSize = 4;
+
+ float temp;
+ uint16_t i;
+ uint16_t uiCnt = 0;
+
+
+ while (true) {
+ for (i = 0, temp = 0.0f; i < bufferSize; i++) {
+ temp += ((float)getADCTemp() - V25) / Avg_Slope + 48.2f;
+ Thread::wait(100);
+ }
+ temp /= (float)bufferSize;
+
+ mutexIntTemp.lock();
+ int_temp_data.temperature = temp;
+ mutexIntTemp.unlock();
+
+ Thread::wait(5000);
+ }
+}