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Dependencies:   mbed

main.cpp@1:581901598cda, 2019-12-02 (annotated)

Committer:
f3d
Date:
Mon Dec 02 12:13:04 2019 +0000
Revision:
1:581901598cda
Parent:
0:88449c646fbd 
Added speed-up/slow-down code

Who changed what in which revision?

UserRevisionLine numberNew contents of line
f3d 0:88449c646fbd 1 #include "mbed.h"
f3d 0:88449c646fbd 2 #include <stm32l432xx.h>
f3d 0:88449c646fbd 3 #include "sine.h"
f3d 0:88449c646fbd 4 /*
f3d 0:88449c646fbd 5 For register definitions see here:
f3d 0:88449c646fbd 6 https://github.com/ARMmbed/mbed-os/blob/master/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L432xC/device/stm32l432xx.h
f3d 0:88449c646fbd 7 */
f3d 0:88449c646fbd 8
f3d 0:88449c646fbd 9 // Using the MBED libraries to configure the PWM outputs (its easier than
f3d 0:88449c646fbd 10 // calculating all of the register contents by hand)
f3d 0:88449c646fbd 11 PwmOut PhaATop(PA_8);
f3d 0:88449c646fbd 12 PwmOut PhaBTop(PA_9);
f3d 0:88449c646fbd 13 PwmOut PhaCTop(PA_10);
f3d 0:88449c646fbd 14 PwmOut PhaABottom(PA_7);
f3d 0:88449c646fbd 15 PwmOut PhaBBottom(PB_0);
f3d 0:88449c646fbd 16 PwmOut PhaCBottom(PB_1);
f3d 1:581901598cda 17 DigitalIn Slow(D4);
f3d 1:581901598cda 18 DigitalIn Fast(D5);
f3d 1:581901598cda 19 DigitalOut myled(LED1);
f3d 1:581901598cda 20 #define MAX_DELTA 500
f3d 1:581901598cda 21 volatile int Delta=0;
f3d 0:88449c646fbd 22 int AIndex=0;
f3d 0:88449c646fbd 23 int BIndex=90;
f3d 0:88449c646fbd 24 int CIndex=180;
f3d 0:88449c646fbd 25 void TimerISR(void)
f3d 0:88449c646fbd 26 {
f3d 1:581901598cda 27 TIM1->ARR = 270+Delta;
f3d 1:581901598cda 28 int Offset=Delta/2;
f3d 1:581901598cda 29 TIM1->CCR1 = sine_table[AIndex]+Offset;
f3d 1:581901598cda 30 TIM1->CCR2 = sine_table[BIndex]+Offset;
f3d 1:581901598cda 31 TIM1->CCR3 = sine_table[CIndex]+Offset;
f3d 0:88449c646fbd 32 AIndex++;
f3d 0:88449c646fbd 33 if (AIndex >= PWM_STEPS)
f3d 0:88449c646fbd 34 AIndex = 0;
f3d 0:88449c646fbd 35 BIndex++;
f3d 0:88449c646fbd 36 if (BIndex >= PWM_STEPS)
f3d 0:88449c646fbd 37 BIndex = 0;
f3d 0:88449c646fbd 38 CIndex++;
f3d 0:88449c646fbd 39 if (CIndex >= PWM_STEPS)
f3d 0:88449c646fbd 40 CIndex = 0;
f3d 0:88449c646fbd 41
f3d 0:88449c646fbd 42
f3d 0:88449c646fbd 43 TIM1->SR &= ~0x3f; // ack the interrupt
f3d 0:88449c646fbd 44 }
f3d 0:88449c646fbd 45 void initTimer1()
f3d 0:88449c646fbd 46 {
f3d 0:88449c646fbd 47
f3d 0:88449c646fbd 48 TIM1->CR1 = 0; // make sure Counter is disabled before changing configuration
f3d 0:88449c646fbd 49 TIM1->CR2 = 0;
f3d 0:88449c646fbd 50 TIM1->ARR = 270;
f3d 0:88449c646fbd 51 TIM1->PSC = 21;
f3d 0:88449c646fbd 52 TIM1->CCR1 = 135; // 50% duty
f3d 0:88449c646fbd 53 TIM1->CCR2 = 135; // 50% duty
f3d 0:88449c646fbd 54 TIM1->CCR3 = 135; // 50% duty
f3d 1:581901598cda 55 //// Enable complimentary outputs on channels 1 to 3
f3d 1:581901598cda 56 //TIM1->CCER = (1 << 0) + (1 << 2) + (1 << 4) + (1 << 6) + (1 << 8) + (1<<10);
f3d 1:581901598cda 57 TIM1->CCER = (1 << 0) + (1 << 4) + (1 << 8);
f3d 0:88449c646fbd 58 TIM1->SR = 0; // Clear flags.
f3d 0:88449c646fbd 59 //TIM1->BDTR &= ~(0xff);
f3d 0:88449c646fbd 60 //TIM1->BDTR |= (127); // set dead time to 127 clock cycles
f3d 0:88449c646fbd 61 // Set up the interrupt handler
f3d 0:88449c646fbd 62 TIM1->DIER = 1; // Want update interrupt
f3d 0:88449c646fbd 63 NVIC_SetVector(TIM1_UP_TIM16_IRQn,(uint32_t) TimerISR);
f3d 0:88449c646fbd 64 NVIC_EnableIRQ(TIM1_UP_TIM16_IRQn);
f3d 1:581901598cda 65 __enable_irq(); // enable interrupts
f3d 0:88449c646fbd 66 TIM1->CR1 |= 1; // enable counter
f3d 0:88449c646fbd 67
f3d 0:88449c646fbd 68 }
f3d 0:88449c646fbd 69
f3d 0:88449c646fbd 70 int main() {
f3d 0:88449c646fbd 71 initTimer1();
f3d 0:88449c646fbd 72 while(1) {
f3d 1:581901598cda 73
f3d 1:581901598cda 74 if ( (Slow == 0) || (Fast == 0) )
f3d 1:581901598cda 75 {
f3d 1:581901598cda 76 // user pressed a button so light up an LED
f3d 1:581901598cda 77 myled = 1;
f3d 1:581901598cda 78 if (Slow == 0)
f3d 1:581901598cda 79 {
f3d 1:581901598cda 80 int NextDelta = Delta;
f3d 1:581901598cda 81 NextDelta = NextDelta + 10;
f3d 1:581901598cda 82 if (NextDelta > MAX_DELTA)
f3d 1:581901598cda 83 NextDelta = MAX_DELTA;
f3d 1:581901598cda 84 Delta = NextDelta;
f3d 1:581901598cda 85 }
f3d 1:581901598cda 86 if (Fast == 0)
f3d 1:581901598cda 87 {
f3d 1:581901598cda 88 int NextDelta = Delta;
f3d 1:581901598cda 89 NextDelta = NextDelta - 10;
f3d 1:581901598cda 90 if (NextDelta < 0)
f3d 1:581901598cda 91 NextDelta = 0;
f3d 1:581901598cda 92 Delta = NextDelta;
f3d 1:581901598cda 93 }
f3d 1:581901598cda 94
f3d 1:581901598cda 95 }
f3d 1:581901598cda 96 else
f3d 1:581901598cda 97 {
f3d 1:581901598cda 98 myled = 0;
f3d 1:581901598cda 99 }
f3d 1:581901598cda 100 wait(0.1); // slow down loop to avoid bounces
f3d 0:88449c646fbd 101 }
f3d 0:88449c646fbd 102 }