Martin Johnson / gpio_test_ints

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Dependencies:   STM32F3-Discovery

main.c@1:5d95bdb46dfd, 2018-04-19 (annotated)

Committer:
MartinJohnson
Date:
Thu Apr 19 00:03:02 2018 +0000
Revision:
1:5d95bdb46dfd
Parent:
0:699994a61048
Child:
2:366bad33b2bd
Make it run forever and remove commented out line

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MartinJohnson 0:699994a61048 1
MartinJohnson 0:699994a61048 2 #include <stm32f3_discovery.h>
MartinJohnson 0:699994a61048 3
MartinJohnson 0:699994a61048 4 volatile unsigned sysTiming;
MartinJohnson 0:699994a61048 5 volatile unsigned sysTicks = 0;
MartinJohnson 0:699994a61048 6
MartinJohnson 0:699994a61048 7 void SysTick_Handler(void) {
MartinJohnson 0:699994a61048 8 sysTicks++;
MartinJohnson 0:699994a61048 9 if (sysTiming > 0) --sysTiming;
MartinJohnson 0:699994a61048 10 }
MartinJohnson 0:699994a61048 11
MartinJohnson 0:699994a61048 12 void sysDelayMs(unsigned dly) {
MartinJohnson 0:699994a61048 13 sysTiming = dly;
MartinJohnson 0:699994a61048 14 while (sysTiming > 0) __wfi();
MartinJohnson 0:699994a61048 15
MartinJohnson 0:699994a61048 16 }
MartinJohnson 0:699994a61048 17
MartinJohnson 0:699994a61048 18 int main(void) {
MartinJohnson 0:699994a61048 19
MartinJohnson 0:699994a61048 20 SysTick_Config((SystemCoreClock / 1000));
MartinJohnson 0:699994a61048 21 RCC->AHBENR |= RCC_AHBPeriph_GPIOE | RCC_AHBPeriph_GPIOA;
MartinJohnson 0:699994a61048 22 GPIOE->MODER = (GPIOE->MODER&0xffff) | 0x55550000; // output mode for PE8-15
MartinJohnson 0:699994a61048 23 GPIOA->MODER = (GPIOA->MODER&0xfffffffc) ; // input mode for PA0
MartinJohnson 0:699994a61048 24
MartinJohnson 0:699994a61048 25 GPIOE->BSRR=0xff00;
MartinJohnson 0:699994a61048 26 sysDelayMs(500);
MartinJohnson 0:699994a61048 27 int b=0;
MartinJohnson 1:5d95bdb46dfd 28 while(1) {
MartinJohnson 0:699994a61048 29 GPIOE->BSRR=1<<(b+8);
MartinJohnson 0:699994a61048 30 while(GPIOA->IDR&1);
MartinJohnson 0:699994a61048 31 sysDelayMs(100);
MartinJohnson 0:699994a61048 32 GPIOE->BSRR=1<<(b+8+16);
MartinJohnson 0:699994a61048 33 b=(b+1)%8;
MartinJohnson 0:699994a61048 34 }
MartinJohnson 0:699994a61048 35 }
MartinJohnson 0:699994a61048 36
MartinJohnson 0:699994a61048 37