Diff: main.cpp

Revision:

0:d5be69c77549

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sat Mar 07 15:47:32 2020 +0000
@@ -0,0 +1,73 @@
+#include "mbed.h"
+
+DigitalOut myled(LED1);
+/*
+PA8,9,10 are used to drive the PWM outputs.  They are also connected back to TIM_CH1,CH2,CH3 
+EN1,2,3 are pulled low and connected back to PC10,11,12
+PC13 = Blue button
+PB13 = User LED (I think - if not it is PA5)
+*/
+
+#define PWM_PERIOD_COUNT 999
+
+PwmOut PhA(PA_8);
+PwmOut PhB(PA_9);
+PwmOut PhC(PA_10);
+
+DigitalOut En1(PC_10);
+DigitalOut En2(PC_11);
+DigitalOut En3(PC_12);
+Serial pc(USBTX, USBRX); // tx, rx useful for debugging
+volatile int CountA,CountB,CountC;
+void TimerISR(void)
+{
+    TIM1->CCR1 = CountA; 
+    TIM1->CCR2 = CountB; 
+    TIM1->CCR3 = CountC; 
+    CountA = (CountA + 1) % PWM_PERIOD_COUNT;
+    CountB = (CountB + 1) % PWM_PERIOD_COUNT;
+    CountC = (CountC + 1) % PWM_PERIOD_COUNT;
+    TIM1->SR &= ~0x3f; // ack the interrupt    
+
+}
+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 = 0; // 0% duty
+    TIM1->CCR2 = 0; // 0% duty
+    TIM1->CCR3 = 0; // 0% duty
+    // Enable timer outputs on channels 1,2,3
+    TIM1->CCER = (1 << 0) + (1 << 4) + (1 << 8);
+    TIM1->SR = 0;      // Clear flags.    
+    TIM1->CR1 |= 1; // enable counter
+
+    // 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 */
+
+}
+void start()
+{
+    
+    TIM1->CCR1 = 0; // 0% duty
+    TIM1->CCR2 = 0; // 0% duty
+    TIM1->CCR3 = 0; // 0% duty
+    En1 = 1;
+    En2 = 1;
+    En3 = 1;
+
+}
+int main() {
+    initTimer1();
+    start();
+    while(1) {
+        wait(0.1);
+            myled = myled ^ 1;
+    }
+}