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81 lines
2.7 KiB
C
81 lines
2.7 KiB
C
#include "bsp.h"
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#include "stm32c031xx.h" // CMSIS-compatible interface
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// LED marked "LD4" on the NUCLEO-C031C6 board
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#define LD4_PIN 5U
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// external LED to be inserted between GND (short leg) and
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// D12 (longer leg) on the CN9 connector
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#define LD5_PIN 6U
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//............................................................................
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void SysTick_Handler(void) {
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if (GPIOA->IDR & (1U << LD4_PIN)) { // is LD4 ON?
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GPIOA->BSRR = (1U << (LD4_PIN + 16U)); // turn LD4 on
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}
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else { // LD4 is OFF
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GPIOA->BSRR = (1U << LD4_PIN); // turn LD4 on
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}
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}
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//............................................................................
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void BSP_init(void) {
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// enable GPIOA clock port for the LEDs
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RCC->IOPENR |= (1U << 0U);
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// NUCLEO-C031C6 board has LED LD4 on GPIOA pin LD4_PIN
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// and external LED LD5 on GPIO LD5_PIN
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// set the LED pins as push-pull output, no pull-up, pull-down
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GPIOA->MODER &= ~((3U << 2U*LD4_PIN) | (3U << 2U*LD5_PIN));
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GPIOA->MODER |= ((1U << 2U*LD4_PIN) | (1U << 2U*LD5_PIN));
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GPIOA->OTYPER &= ~((1U << LD4_PIN) | (1U << LD5_PIN));
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GPIOA->OSPEEDR &= ~((3U << 2U*LD4_PIN) | (3U << 2U*LD5_PIN));
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GPIOA->OSPEEDR |= ((1U << 2U*LD4_PIN) | (1U << 2U*LD5_PIN));
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GPIOA->PUPDR &= ~((3U << 2U*LD4_PIN) | (3U << 2U*LD5_PIN));
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// configure the SysTick interrupt
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SysTick->LOAD = SystemCoreClock/2U - 1U; // 1/2 second
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SysTick->VAL = 0U;
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SysTick->CTRL = (1U << 2U) | (1U << 1U) | 1U;
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}
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//............................................................................
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void BSP_led4On(void) {
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GPIOA->BSRR = (1U << LD4_PIN); // turn LD4 on
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}
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//............................................................................
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void BSP_led4Off(void) {
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GPIOA->BSRR = (1U << (LD4_PIN + 16U)); // turn LD4 on
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}
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//............................................................................
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void BSP_led5On(void) {
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GPIOA->BSRR = (1U << LD5_PIN); // turn LD5 on
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}
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//............................................................................
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void BSP_led5Off(void) {
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GPIOA->BSRR = (1U << (LD5_PIN + 16U)); // turn LD5 on
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}
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//............................................................................
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void BSP_delay(int volatile iter) {
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while (iter > 0) { // delay loop
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--iter;
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}
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}
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//............................................................................
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void assert_failed(char const * const module, int const id); // prototype
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void assert_failed(char const * const module, int const id) {
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(void)module; // unused parameter
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(void)id; // unused parameter
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#ifndef NDEBUG
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// light up the user LED
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GPIOA->BSRR = (1U << LD4_PIN); // turn LED on
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// for debugging, hang on in an endless loop...
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for (;;) {
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}
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#endif
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NVIC_SystemReset();
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}
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