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109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
/* Board Support Package (BSP) for the STM32 NUCLEO-C031C6 board */
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#include <stdint.h> /* Standard integers. WG14/N843 C99 Standard */
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#include "bsp.h"
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#include "stm32c0xx.h" // CMSIS-compliant header file for the MCU used
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/* add other drivers if necessary... */
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// Local-scope defines -----------------------------------------------------
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// LED pins available on the board (just one user LED LD4--Green on PA.5)
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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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// Button pins available on the board (just one user Button B1 on PC.13)
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#define B1_PIN 13U
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static uint32_t volatile l_tickCtr;
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/* ISRs ===============================================*/
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void SysTick_Handler(void) {
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++l_tickCtr;
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}
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/* BSP functions ===========================================================*/
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void BSP_init(void) {
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// enable GPIOA clock port for the LED LD4
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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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// enable GPIOC clock port for the Button B1
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RCC->IOPENR |= (1U << 2U);
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// configure Button B1 pin on GPIOC as input, no pull-up, pull-down
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GPIOC->MODER &= ~(3U << 2U*B1_PIN);
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GPIOC->PUPDR &= ~(3U << 2U*B1_PIN);
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SystemCoreClockUpdate();
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SysTick_Config(SystemCoreClock / BSP_TICKS_PER_SEC);
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__enable_irq();
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}
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uint32_t BSP_tickCtr(void) {
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uint32_t tickCtr;
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__disable_irq();
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tickCtr = l_tickCtr;
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__enable_irq();
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return tickCtr;
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}
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void BSP_delay(uint32_t ticks) {
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uint32_t start = BSP_tickCtr();
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while ((BSP_tickCtr() - start) < ticks) {
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}
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}
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/*..........................................................................*/
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void BSP_ledRedOn(void) {
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GPIOA->BSRR = (1U << LD5_PIN); // turn LD5 on
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}
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void BSP_ledRedOff(void) {
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GPIOA->BSRR = (1U << (LD5_PIN + 16U)); // turn LD5 off
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}
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void BSP_ledBlueOn(void) {
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//GPIOA->BSRR = (1U << LD4_PIN); // turn LD4 on
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}
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void BSP_ledBlueOff(void) {
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//GPIOA->BSRR = (1U << (LD4_PIN + 16U)); // turn LD4 off
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}
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void BSP_ledGreenOn(void) {
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GPIOA->BSRR = (1U << LD4_PIN); // turn LD4 on
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}
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void BSP_ledGreenOff(void) {
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GPIOA->BSRR = (1U << (LD4_PIN + 16U)); // turn LD4 off
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}
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//............................................................................
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_Noreturn void assert_failed(char const * const module, int const id);
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_Noreturn 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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GPIOA->BSRR = (1U << LD4_PIN); // turn LD4 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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