Diff: main.cpp

Revision:

0:0393a9702467

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Nov 08 13:13:20 2022 +0000
@@ -0,0 +1,67 @@
+// F767ZI PWM test  D6/PE_9 TIM1_CH1  or D13/PA_5 TIM2_CH1
+
+#include "mbed.h"
+#define PRREG(z) printf(#z" 0x%x\n",z)
+
+#if 0
+PwmOut pwm(D6);
+
+int main()
+{
+    printf("D6 PE_9\n");
+    // specify period first, then everything else
+   // pwm.period(0.001f);  //  second period
+   //pwm.write(0.50f);  // 50% duty cycle
+   
+// manual 1 mhz
+    PRREG(RCC->APB2ENR);
+    PRREG(GPIOE->AFR[1]);  //alt PE_9
+    TIM1->PSC = 0;
+    TIM1->ARR = 216-1;
+    TIM1->CCR1 = 216/2;
+    TIM1->CNT = 0;
+    TIM1->CR1 = 1;  
+    
+    PRREG(TIM1->CR1);
+    PRREG(TIM1->PSC);
+    PRREG(TIM1->ARR);
+    PRREG(TIM1->CCR1);
+    
+    while (1);         // led flashing
+}
+#else
+PwmOut pwm(D13), led(LED2);
+
+int main()
+{
+    printf("D13 PA_5\n");
+    // specify period first, then everything else
+    //pwm.period(0.001f);  //  second period
+     //pwm.write(0.50f);  // 50% duty cycle
+
+// manual 1 mhz
+    PRREG(RCC->APB1ENR);
+    PRREG(GPIOA->AFR[0]);  //alt PA_5
+    TIM2->PSC = 0; 
+    TIM2->ARR = 108-1;
+    TIM2->CCR1 = 108/2;
+    TIM2->CNT = 0;   // need this
+    TIM2->CR1 =  TIM_CR1_CEN;  
+
+    PRREG(TIM2->CR1);
+    PRREG(TIM2->PSC);
+    PRREG(TIM2->ARR);
+    PRREG(TIM2->CCR1);
+    
+    printf("us_ticker\n");
+    PRREG(TIM5->CR1);  // us_ticker
+    PRREG(TIM5->PSC);
+    PRREG(TIM5->ARR);
+    PRREG(TIM5->CCR1);
+    PRREG(TIM5->CNT);
+    
+    led.period(0.5);
+    led.write(0.5);
+    while (1);         // led flashing
+}
+#endif
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