Revision 0:e39d2e2b668a, committed 2019-03-26

Comitter:

f3d

Date:

Tue Mar 26 12:46:43 2019 +0000

Commit message:

Three phase PWM (fixed) with complimentary outputs and dead-time for the STM32L432 Nucleo;

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Mar 26 12:46:43 2019 +0000
@@ -0,0 +1,46 @@
+#include "mbed.h"
+#include <stm32l432xx.h>
+
+
+#define PWM_PERIOD_COUNT 1000
+
+/*
+For register definitions see here:
+https://github.com/ARMmbed/mbed-os/blob/master/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L432xC/device/stm32l432xx.h
+*/
+// Using the MBED libraries to configure the PWM outputs (its easier than 
+// calculating all of the register contents by hand)
+DigitalOut myled(LED1);
+PwmOut  PhaATop(PA_8); 
+PwmOut  PhaBTop(PA_9); 
+PwmOut  PhaCTop(PA_10); 
+PwmOut  PhaABottom(PA_7); 
+PwmOut  PhaBBottom(PB_0); 
+PwmOut  PhaCBottom(PB_1); 
+
+void initTimer1()
+{    
+    
+    TIM1->CR1 = 0; // make sure Counter is disabled before changing configuration
+    TIM1->CR2 = 0;
+    TIM1->PSC = 1;
+    TIM1->ARR = PWM_PERIOD_COUNT;
+    TIM1->CCR1 = PWM_PERIOD_COUNT/4; // 25% duty
+    TIM1->CCR2 = PWM_PERIOD_COUNT/2; // 50% duty
+    TIM1->CCR3 = 3*PWM_PERIOD_COUNT/4; // 75% duty
+    // Enable complimentary outputs on channels 1 to 3
+    TIM1->CCER = (1 << 0) + (1 << 2) + (1 << 4) + (1 << 6) + (1 << 8) + (1<<10);
+    TIM1->SR = 0;      // Clear flags.    
+    TIM1->BDTR &= ~(0xff);
+    TIM1->BDTR |= (127); // set dead time to 127 clock cycles
+    
+
+}
+
+int main() {    
+   
+    initTimer1();
+    while(1) {
+       
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Tue Mar 26 12:46:43 2019 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/aa5281ff4a02
\ No newline at end of file