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#include <stm32f0xx.h>
#include <stdint.h>
#include <system_stm32f0xx.h>
#include <stm32f0xx_ll_utils.h>
#include <string.h>
#include <unistd.h>
/*
* Part number: STM32F030F4C6
*/
void tick(void) {
for(int i=0; i<50; i++)
__asm__("nop");
}
int main(void) {
RCC->CR |= RCC_CR_HSEON;
while (!(RCC->CR&RCC_CR_HSERDY));
RCC->CFGR &= ~RCC_CFGR_PLLMUL_Msk & ~RCC_CFGR_SW_Msk;
RCC->CFGR |= (2<<RCC_CFGR_PLLMUL_Pos) | RCC_CFGR_PLLSRC_HSE_PREDIV; /* PLL x4 */
RCC->CFGR2 &= ~RCC_CFGR2_PREDIV_Msk; /* PREDIV=0 */
RCC->CR |= RCC_CR_PLLON;
while (!(RCC->CR&RCC_CR_PLLRDY));
RCC->CFGR |= (2<<RCC_CFGR_SW_Pos);
SystemCoreClockUpdate();
LL_Init1msTick(SystemCoreClock);
RCC->AHBENR |= RCC_AHBENR_GPIOAEN;
RCC->APB2ENR |= RCC_APB2ENR_SPI1EN;
GPIOA->MODER |=
(2<<GPIO_MODER_MODER5_Pos) /* PA5 - SCLK */
| (2<<GPIO_MODER_MODER7_Pos) /* PA7 - MOSI */
| (1<<GPIO_MODER_MODER9_Pos) /* PA9 - LED strobe */
| (1<<GPIO_MODER_MODER10_Pos);/* PA10 - Auxiliary strobe */
/* Set shift register IO GPIO output speed */
GPIOA->OSPEEDR |=
(3<<GPIO_OSPEEDR_OSPEEDR5_Pos) /* SCLK */
| (3<<GPIO_OSPEEDR_OSPEEDR7_Pos) /* MOSI */
| (3<<GPIO_OSPEEDR_OSPEEDR9_Pos) /* LED strobe */
| (3<<GPIO_OSPEEDR_OSPEEDR10_Pos); /* Auxiliary strobe */
GPIOA->AFR[0] |=
(0<<GPIO_AFRL_AFRL5_Pos) /* SPI1_SCK */
| (0<<GPIO_AFRL_AFRL7_Pos); /* SPI1_MOSI */
/* Configure SPI controller */
SPI1->CR1 = SPI_CR1_SSM | SPI_CR1_SSI | SPI_CR1_SPE | (7<<SPI_CR1_BR_Pos) | SPI_CR1_MSTR;
SPI1->CR2 = (7<<SPI_CR2_DS_Pos);
int pos1 = 0;
int pos2 = 0;
while (42) {
for (int i=0; i<6; i++) {
if (pos1 == i) {
SPI1->DR = 1<<pos2;
} else {
SPI1->DR = 0;
}
while (SPI1->SR & SPI_SR_BSY);
tick();
}
pos2 += 1;
if (pos2 == 8) {
pos2 = 0;
pos1 += 1;
if (pos1 == 6)
pos1 = 0;
}
/* Strobe both LED drivers and aux regs */
GPIOA->BSRR = GPIO_BSRR_BS_9 | GPIO_BSRR_BS_10;
tick();
GPIOA->BSRR = GPIO_BSRR_BR_9 | GPIO_BSRR_BR_10;
LL_mDelay(1);
}
}
void NMI_Handler(void) {
}
void HardFault_Handler(void) {
for(;;);
}
void SVC_Handler(void) {
}
void PendSV_Handler(void) {
}
void SysTick_Handler(void) {
}
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