串口printf输出
Nucleo-U5A5的串口1和STlinkV3的串口相连，用以输出打印日志。
在cubeMX中开启串口1，在工程中重定向，就可以使用printf了
/* USER CODE BEGIN Includes */
#include "stdio.h"
/* USER CODE END Includes */
#ifdef __GNUC__
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif
PUTCHAR_PROTOTYPE { HAL_UART_Transmit(&huart1 , (uint8_t *)&ch, 1, 0xFFFF); return ch; }
User_key按键的外部中断
在cubeMX中的NVIC中enable按键的中断，并修改优先级高于systic，在stm32u5xx_it.c中可以看到EXTI13对应的中断接口函数
/**
* [url=home.php?mod=space&uid=159083]@brief[/url] This function handles EXTI Line13 interrupt.
*/
void EXTI13_IRQHandler(void)
{
/* USER CODE BEGIN EXTI13_IRQn 0 */
/* USER CODE END EXTI13_IRQn 0 */
HAL_GPIO_EXTI_IRQHandler(USER_BUTTON_Pin);
/* USER CODE BEGIN EXTI13_IRQn 1 */
/* USER CODE END EXTI13_IRQn 1 */
}
cubeMX生成代码中已写好gpio中断函数，清除相应的中断标志位，并弱定义了中断返回，使用时再重新书写中断返回函数HAL_GPIO_EXTI_Rising_Callback(GPIO_Pin);或HAL_GPIO_EXTI_Falling_Callback(GPIO_Pin);即可
void HAL_GPIO_EXTI_IRQHandler(uint16_t GPIO_Pin)
{
/* EXTI line interrupt detected */
if (__HAL_GPIO_EXTI_GET_RISING_IT(GPIO_Pin) != 0U)
{
__HAL_GPIO_EXTI_CLEAR_RISING_IT(GPIO_Pin);
HAL_GPIO_EXTI_Rising_Callback(GPIO_Pin);
}
if (__HAL_GPIO_EXTI_GET_FALLING_IT(GPIO_Pin) != 0U)
{
__HAL_GPIO_EXTI_CLEAR_FALLING_IT(GPIO_Pin);
HAL_GPIO_EXTI_Falling_Callback(GPIO_Pin);
}
}
在main中定义EXTI13的中断返回函数，按下Blue翻转
void HAL_GPIO_EXTI_Rising_Callback(uint16_t GPIO_Pin)
{
if(GPIO_Pin == USER_BUTTON_Pin)
{
HAL_Delay(50);
HAL_GPIO_TogglePin(LED_BLUE_GPIO_Port,LED_BLUE_Pin);
printf("key exti callback\r\n");
}
}
按键按下，BlueLED翻转
PWM输出呼吸灯
在cubeMX中配置GreenLED的定时器TIM3-Ch2
- 预分频（84-1，也就得到1MHz的时钟频率作为定时器的时钟源）
- 向上计数模式（从0开始向上计数至初值并发生上溢事件）
- 计数器重装值（500-1，每计数500次发生溢出，最终PWM频率为1M/500=2kHz）
- 内部时钟分频（可以理解为在预分频的基础上再进行一次分频，但只能2或4分频，这里不需要）
- 计数器自动重装载使能
开启全局中断
以上按160M/160=1M，1M/1000=1K的频率计数，实现呼吸灯效果
HAL_TIM_PWM_Start(&htim3,TIM_CHANNEL_2);
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
HAL_Delay(5);
if(dir)led0pwmval++; //dir==1 led0pwmval递增
else led0pwmval--; //dir==0 led0pwmval递减
if(led0pwmval>900)dir=0; //led0pwmval到达900后，方向为递减
if(led0pwmval==0)dir=1; //led0pwmval递减到0后，方向改为递增
__HAL_TIM_SetCompare(&htim3,TIM_CHANNEL_2,led0pwmval);
}
启动定时器通道：HAL_TIM_PWM_Start(&htim3,TIM_CHANNEL_2);
PWM比较输出：__HAL_TIM_SetCompare(&htim3,TIM_CHANNEL_2,led0pwmval);
简单封装一下LED和PWM程序：
按键配合PWM程序，按键按下中断开启LED的PWM，再按下LED缓慢熄灭
/* USER CODE BEGIN Header */
/**
******************************************************************************
* [url=home.php?mod=space&uid=1307177]@File[/url] : main.c
* @brief : Main program body
******************************************************************************
* [url=home.php?mod=space&uid=1020061]@attention[/url] *
* Copyright (c) 2024 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "adc.h"
#include "icache.h"
#include "tim.h"
#include "ucpd.h"
#include "usart.h"
#include "usb_otg.h"
#include "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "stdio.h"
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void SystemPower_Config(void);
/* USER CODE BEGIN PFP */
#ifdef __GNUC__
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif
PUTCHAR_PROTOTYPE { HAL_UART_Transmit(&huart1 , (uint8_t *)&ch, 1, 0xFFFF); return ch; }
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
uint8_t dir=1;
uint16_t led0pwmval=0;
uint8_t pwmstate=1;
uint32_t uwIC2Value1 = 0;
uint32_t uwIC2Value2 = 0;
uint32_t uwDiffCapture = 0;
uint16_t uhCaptureIndex = 0;
uint32_t uwFrequency = 0;
uint32_t tim6_count = 0;
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
uint16_t adc_val;
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* Configure the System Power */
SystemPower_Config();
/* USER CODE BEGIN SysInit */
HAL_PWREx_EnableVddA();
HAL_PWREx_EnableVddIO2();
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_ADC1_Init();
MX_ICACHE_Init();
MX_TIM3_Init();
MX_UCPD1_Init();
MX_USART1_UART_Init();
MX_USB_OTG_HS_HCD_Init();
MX_TIM1_Init();
MX_TIM6_Init();
/* USER CODE BEGIN 2 */
HAL_TIM_PWM_Start(&htim3,TIM_CHANNEL_2);//启动定时器PWM比较输出
HAL_TIM_Base_Start_IT(&htim6); //启定时器6中断
printf("start\r\n");
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
if(HAL_GPIO_ReadPin(LED_BLUE_GPIO_Port,LED_BLUE_Pin))
{
LED_PWM(400);
}
else LED_PWM(0);
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Configure the main internal regulator output voltage
*/
if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI|RCC_OSCILLATORTYPE_MSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.MSIState = RCC_MSI_ON;
RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_0;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;
RCC_OscInitStruct.PLL.PLLMBOOST = RCC_PLLMBOOST_DIV4;
RCC_OscInitStruct.PLL.PLLM = 3;
RCC_OscInitStruct.PLL.PLLN = 10;
RCC_OscInitStruct.PLL.PLLP = 8;
RCC_OscInitStruct.PLL.PLLQ = 2;
RCC_OscInitStruct.PLL.PLLR = 1;
RCC_OscInitStruct.PLL.PLLRGE = RCC_PLLVCIRANGE_1;
RCC_OscInitStruct.PLL.PLLFRACN = 0;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2
|RCC_CLOCKTYPE_PCLK3;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB3CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
{
Error_Handler();
}
}
/**
* @brief Power Configuration
* @retval None
*/
static void SystemPower_Config(void)
{
HAL_PWREx_EnableVddIO2();
/*
* Switch to SMPS regulator instead of LDO
*/
if (HAL_PWREx_ConfigSupply(PWR_SMPS_SUPPLY) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN PWR */
/* USER CODE END PWR */
}
/* USER CODE BEGIN 4 */
void LED_PWM(uint16_t num)
{
if(num!=0)
pwmstate = 1;
else
pwmstate = 0;
switch(pwmstate)
{
case 0:
if(0 == led0pwmval) break;
else
{
HAL_Delay(5);
led0pwmval--;
__HAL_TIM_SetCompare(&htim3,TIM_CHANNEL_2,led0pwmval);
}
case 1:
{
HAL_Delay(5);
if(dir)led0pwmval++; //dir==1 led0pwmval递增
else led0pwmval--; //dir==0 led0pwmval递减
if(led0pwmval>num)dir=0; //led0pwmval到达x00后，方向为减
if(led0pwmval<=0) dir=1; //led0pwmval递减x00后，方向为增
__HAL_TIM_SetCompare(&htim3,TIM_CHANNEL_2,led0pwmval);
}
}
}
//按键上升沿触发中断返回函数
void HAL_GPIO_EXTI_Rising_Callback(uint16_t GPIO_Pin)
{
if(GPIO_Pin == USER_BUTTON_Pin)
{
HAL_Delay(50);
HAL_GPIO_TogglePin(LED_BLUE_GPIO_Port,LED_BLUE_Pin);
printf("key exti callback\r\n");
printf("Blue state is : %d\r\n",HAL_GPIO_ReadPin(LED_BLUE_GPIO_Port,LED_BLUE_Pin));
}
}
//输入捕获函数
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
{
if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1)
{
if(uhCaptureIndex == 0)
{
/* Get the 1st Input Capture value */
uwIC2Value1 = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1);
uhCaptureIndex = 1;
}
else if(uhCaptureIndex == 1)
{
/* Get the 2nd Input Capture value */
uwIC2Value2 = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1);
/* Capture computation */
if (uwIC2Value2 > uwIC2Value1)
{
uwDiffCapture = (uwIC2Value2 - uwIC2Value1);
}
else if (uwIC2Value2 < uwIC2Value1)
{
/* 0xFFFF is max TIM1_CCRx value */
uwDiffCapture = ((0xFFFF - uwIC2Value1) + uwIC2Value2) + 1;
}
else
{
/* If capture values are equal, we have reached the limit of frequency
measures */
Error_Handler();
}
/* Frequency computation: for this example TIMx (TIM1) is clocked by
APB2Clk */
uwFrequency = HAL_RCC_GetPCLK2Freq() / uwDiffCapture;
uhCaptureIndex = 0;
}
}
}
//定时器6产生时基
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
if(htim == &htim6)
{
tim6_count++;
}
}
/* USER CODE END 4 */
/**
* @brief This function is executed in case of error occurrence.
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
__disable_irq();
while (1)
{
}
/* USER CODE END Error_Handler_Debug */
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* USER CODE BEGIN 6 */
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
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