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76 lines
1.4 KiB
C
76 lines
1.4 KiB
C
#include <stm32l476xx.h>
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#include <clock.h>
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#include <heap.h>
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#include <task.h>
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/**
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* Accomplishments:
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* - GPIO in/out
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* - got to 80MHz clock
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* - basic heap
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* - multitask, can exit
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*/
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void pulse(uint8_t byte);
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void kmain(void);
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int main(void)
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{
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asm("cpsid i");
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// prepare flash latency for 40MHz operation
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FLASH->ACR &= ~(FLASH_ACR_LATENCY);
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FLASH->ACR |= FLASH_ACR_LATENCY_4WS;
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RCC->AHB2ENR |= RCC_AHB2ENR_GPIOAEN; // A clk enable
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GPIOA->MODER &= ~(GPIO_MODER_MODE5 | GPIO_MODER_MODE6); // A5 -> output, A0 input
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GPIOA->MODER |= GPIO_MODER_MODE5_0 | GPIO_MODER_MODE6_0;
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GPIOA->PUPDR &= ~(GPIO_PUPDR_PUPD5 | GPIO_PUPDR_PUPD6);
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GPIOA->PUPDR |= GPIO_PUPDR_PUPD5_0 | GPIO_PUPDR_PUPD6_0; // pulldown for button (1)
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//if (GPIOA->IDR & 0x01)
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clock_init();
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task_init(kmain);
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while (1);
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}
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void task(void);
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void kmain(void)
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{
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asm("cpsie i");
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task_start(task, 1024);
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while (1) {
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GPIOA->BSRR |= 1 << 6;
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delay(500);
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GPIOA->BRR |= 1 << 6;
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delay(500);
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}
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}
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void task(void)
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{
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while (1) {
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GPIOA->BSRR |= 1 << 5;
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delay(200);
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GPIOA->BRR |= 1 << 5;
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delay(200);
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}
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}
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void _exit(int code)
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{ for (;;); }
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void pulse(uint8_t byte)
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{
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int8_t i = 7;
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do {
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GPIOA->BSRR |= 1 << 5;
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delay((byte & (1 << i)) ? 400 : 100);
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GPIOA->BRR |= 1 << 5;
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delay((byte & (1 << i)) ? 100 : 400);
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} while (--i >= 0);
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}
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