59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
#include <stm32f0xx.h>
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#include <stm-periph/stm32-gpio-macros.h>
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#include <systick.h>
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static void setup_pins(void)
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{
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uint32_t tmp;
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RCC->AHBENR |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOBEN;
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tmp = GPIOA->MODER;
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/* Reset all used port pins */
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tmp &= MODER_DELETE(0) & MODER_DELETE(1) & MODER_DELETE(2) & MODER_DELETE(3) & \
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MODER_DELETE(4) & MODER_DELETE(5) & MODER_DELETE(6) & MODER_DELETE(7) & \
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MODER_DELETE(8) & MODER_DELETE(9) & MODER_DELETE(10);
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/* Analog ports for POTIs */
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tmp |= ANALOG(0) | ANALOG(1) | ANALOG(4);
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/* Setup USART1 RX/TX (AF1) */
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tmp |= ALTFUNC(2) | ALTFUNC(3);
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SETAF(GPIOA, 2, 1);
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SETAF(GPIOA, 3, 1);
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/* LED enables for Potentiometers */
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tmp |= OUTPUT(5) | OUTPUT(6) | OUTPUT(7);
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GPIOA->ODR &= ~((1 << 5) | (1 << 6) | (1 << 7));
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/* Setup I2C pins (AF4) */
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tmp |= ALTFUNC(9) | ALTFUNC(10);
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SETAF(GPIOA, 9, 4);
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SETAF(GPIOA, 10, 4);
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/* Set I2C Pins to open drain. Others are push pull */
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GPIOA->OTYPER = OTYP_OPENDRAIN(9) | OTYP_OPENDRAIN(10);
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/* Write changes to GPIOA mode register */
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GPIOA->MODER = tmp;
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/* PB1 Input with pullup */
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GPIOB->MODER &= MODER_DELETE(1);
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GPIOB->PUPDR = PULLUP(1);
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}
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int main(void)
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{
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setup_pins();
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SysTick_Config(48000000UL/1000);
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GPIOA->ODR |= (1<<5) | (1<<7);
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/* Blink the LEDs */
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while (1) {
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systick_wait_ms(250);
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GPIOA->ODR ^= (1 << 5) | (1 << 6) | (1 << 7);
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}
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}
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