Revision 0:b98f50bdfcd4, committed 2018-06-05

Comitter:

f3d

Date:

Tue Jun 05 09:17:33 2018 +0000

Commit message:

PWM Example for 3 phase bridge (fixed duty);

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Jun 05 09:17:33 2018 +0000
@@ -0,0 +1,54 @@
+#include "mbed.h"
+#define PWM_PERIOD_COUNT 20000
+/*
+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)
+
+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 TimerISR(void)
+{   
+    
+   
+    TIM1->CCR1 = PWM_PERIOD_COUNT/2;    
+    TIM1->CCR2 = PWM_PERIOD_COUNT/2;
+    TIM1->CCR3 = PWM_PERIOD_COUNT/2;
+   
+    TIM1->SR &= ~0x3f; // ack the interrupt    
+}
+void initTimer1()
+{    
+    
+    TIM1->CR1 = 0; // make sure Counter is disabled before changing configuration
+    TIM1->CR2 = 0;
+    TIM1->ARR = PWM_PERIOD_COUNT;
+    TIM1->CCR1 = 0; // 0% duty
+    TIM1->CCR2 = 0; // 0% duty
+    TIM1->CCR3 = 0; // 0% 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
+    // Set up the interrupt handler
+    TIM1->DIER = 1; // Want update interrupt
+    NVIC_SetVector(TIM1_UP_TIM16_IRQn,(uint32_t) TimerISR);   
+    NVIC_EnableIRQ(TIM1_UP_TIM16_IRQn);
+    __enable_irq();   // enable interrupts */
+    TIM1->CR1 |= 1; // enable counter
+
+}
+int main() {
+    initTimer1();
+    while(1) {
+        
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Tue Jun 05 09:17:33 2018 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/5aab5a7997ee
\ No newline at end of file