Diff: main.cpp

Revision:

0:88449c646fbd

Child:

1:581901598cda

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Mar 26 17:33:53 2019 +0000
@@ -0,0 +1,68 @@
+#include "mbed.h"
+#include <stm32l432xx.h>
+#include "sine.h"
+/*
+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); 
+int AIndex=0;
+int BIndex=90;
+int CIndex=180;
+void TimerISR(void)
+{   
+    TIM1->CCR1 = sine_table[AIndex];
+    TIM1->CCR2 = sine_table[BIndex];
+    TIM1->CCR3 = sine_table[CIndex];
+    AIndex++;
+    if (AIndex >= PWM_STEPS)
+        AIndex = 0;
+    BIndex++;
+    if (BIndex >= PWM_STEPS)
+        BIndex = 0;
+    CIndex++;
+    if (CIndex >= PWM_STEPS)
+        CIndex = 0;
+
+
+    TIM1->SR &= ~0x3f; // ack the interrupt    
+}
+void initTimer1()
+{    
+    
+    TIM1->CR1 = 0; // make sure Counter is disabled before changing configuration
+    TIM1->CR2 = 0;
+    TIM1->ARR = 270;
+    TIM1->PSC = 21;
+    TIM1->CCR1 = 135; // 50% duty
+    TIM1->CCR2 = 135; // 50% duty
+    TIM1->CCR3 = 135; // 50% 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) {
+       
+    }
+}