82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
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#include <stm32f407xx.h>
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#include <stdint.h>
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#include <system_stm32f4xx.h>
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#include <stm32f4xx_ll_utils.h>
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#include <stm32f4xx_ll_spi.h>
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#include <string.h>
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#include <unistd.h>
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/*
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* Part number: STM32F030F4C6
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*/
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void _init(void) {}
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void tick(void) {
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for(int i=0; i<50; i++)
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__asm__("nop");
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}
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int main(void) {
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/*
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RCC->CR |= RCC_CR_HSEON;
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while (!(RCC->CR&RCC_CR_HSERDY));
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RCC->CFGR &= ~RCC_CFGR_PLLMUL_Msk & ~RCC_CFGR_SW_Msk;
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RCC->CFGR |= (2<<RCC_CFGR_PLLMUL_Pos) | RCC_CFGR_PLLSRC_HSE_PREDIV;
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RCC->CFGR2 &= ~RCC_CFGR2_PREDIV_Msk;
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RCC->CFGR2 |= RCC_CFGR2_PREDIV_DIV2;
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RCC->CR |= RCC_CR_PLLON;
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while (!(RCC->CR&RCC_CR_PLLRDY));
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RCC->CFGR |= (2<<RCC_CFGR_SW_Pos);
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SystemCoreClockUpdate();
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*/
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LL_Init1msTick(SystemCoreClock);
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RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN;
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GPIOA->MODER |=
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(1<<GPIO_MODER_MODER5_Pos)|
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(1<<GPIO_MODER_MODER6_Pos)|
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(1<<GPIO_MODER_MODER7_Pos);
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/* Set shift register IO GPIO output speed */
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GPIOA->OSPEEDR |=
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(2<<GPIO_OSPEEDR_OSPEED5_Pos)|
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(2<<GPIO_OSPEEDR_OSPEED6_Pos)|
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(2<<GPIO_OSPEEDR_OSPEED7_Pos);
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GPIOA->BSRR = GPIO_BSRR_BR_5;
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GPIOA->BSRR = GPIO_BSRR_BR_6;
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GPIOA->BSRR = GPIO_BSRR_BR_7;
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while (42) {
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for (int i=0; i<10000; i++)
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tick();
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GPIOA->BSRR = GPIO_BSRR_BS_5;
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GPIOA->BSRR = GPIO_BSRR_BS_6;
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GPIOA->BSRR = GPIO_BSRR_BS_7;
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for (int i=0; i<10000; i++)
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tick();
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GPIOA->BSRR = GPIO_BSRR_BR_5;
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GPIOA->BSRR = GPIO_BSRR_BR_6;
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GPIOA->BSRR = GPIO_BSRR_BR_7;
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}
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}
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void NMI_Handler(void) {
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}
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void HardFault_Handler(void) {
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for(;;);
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}
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void SVC_Handler(void) {
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}
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void PendSV_Handler(void) {
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}
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void SysTick_Handler(void) {
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}
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