对于定时器的实现，也是很容易，HAL直接提供了该延时函数
- /**
- * [url=home.php?mod=space&uid=247401]@brief[/url] This function provides accurate delay (in milliseconds) based
- * on variable incremented.
- * [url=home.php?mod=space&uid=536309]@NOTE[/url] In the default implementation , SysTick timer is the source of time base.
- * It is used to generate interrupts at regular time intervals where uwTick
- * is incremented.
- * @note This function is declared as __weak to be overwritten in case of other
- * implementations in user file.
- * @param Delay: specifies the delay time length, in milliseconds.
- * @retval None
- */
- __weak void HAL_Delay(__IO uint32_t Delay)
- {
- uint32_t tickstart = 0U;
- tickstart = HAL_GetTick();
- while((HAL_GetTick() - tickstart) < Delay)
- {
- }
- }
而实现翻转，就是调用了HAL库函数里的翻转指令
- void HAL_GPIO_TogglePin(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
- {
- /* Check the parameters */
- assert_param(IS_GPIO_PIN(GPIO_Pin));
- GPIOx->ODR ^= GPIO_Pin;
- }
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