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【蓝桥杯嵌入式】第六届国赛

news 2025/6/26 15:59:49

题目

配置

注意事项

代码 - 默写大师

EEPROM读写函数

LED驱动函数

ADC采集

上电初始化

LCD

按键

PWM互补输出

全部代码

hardware.c

hardware.h

control.c

control.h

main.c

题目

配置

注意事项

复制LCD的工程，先配置资源 --- 勾选完选项一定要再看一眼，可能选择错误

ADC：配置ADC2_IN15，对应PB15引脚

EEROM，配置PB6和PB7

按键输入模式PB0、PB1、PB2、PA0

LED 一定要使能PD2

PWM互补输出，用TIM15

TIM6 - 10ms基准定时器

代码 - 默写大师

先默写几个函数

EEPROM读写函数

随机地址读函数 - 参考手册的时序

uint8_t EEPROM_ReadByte(uint8_t address)
{uint8_t data;I2CStart();I2CSendByte(0xA0);		// address + writeI2CWaitAck();I2CSendByte(address);I2CWaitAck();I2CStop();I2CStart();I2CSendByte(0xA1);		// address + readI2CWaitAck();data = I2CReceiveByte();I2CSendNotAck();I2CStop();return data;
}

void EEPROM_WriteByte(uint8_t address, uint8_t data)
{I2CStart();I2CSendByte(0xA0);I2CWaitAck();I2CSendByte(address);I2CWaitAck();I2CSendByte(data);I2CWaitAck();I2CStop();
}

定义几个结构体

//-----------------------
void power_init(void);
void LCD_Disp(void);
void Key_Proc(void);
void ADC_Proc(void);
void PWM_Proc(void);//-----------------------
struct Tick{uint32_t lcd;uint32_t key;uint32_t adc;uint32_t pwm;
};
extern struct Tick tick;struct Flag{bool PWM_Mode;uint8_t LCD_View;
};
extern struct Flag flag;struct Param{double ADC;uint16_t PWM_Frq;       //频率uint8_t  PWM_Duty_PA9;uint8_t  PWM_Duty_PA14;
};
extern struct Param param;

//定义变量
struct Tick tick;
struct Flag flag;
struct Param param;
struct Keys key;

LED驱动函数

void LED_Disp(uint8_t state)
{HAL_GPIO_WritePin(GPIOC, 0xFF00, GPIO_PIN_SET); //0ffHAL_GPIO_WritePin(GPIOC, state << 8, GPIO_PIN_RESET);HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_SET);HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET);
}

ADC采集

double Get_ADC(ADC_HandleTypeDef *hadc)
{uint32_t adc;HAL_ADC_Start(hadc);adc = HAL_ADC_GetValue(hadc);return adc*3.3/4040;    //这里应该是adc*3.3/4096
}
double Get_ADC(ADC_HandleTypeDef *hadc)
{uint32_t adc;HAL_ADC_Start(hadc);adc = Hal_ADC_GetValue(hadc);return adc*3.3/4040;
}

返回值应该是adc*3.3/4096，但是这里我改成了return adc*3.3/4040; 补偿电压采集的数据，范围是0~3.30V

void ADC_Proc(void)
{if (uwTick - tick.adc < 250)return;tick.adc = uwTick;param.ADC = Get_ADC(&hadc2);
}

上电初始化

void power_init(void)
{LCD_Clear(Black);LCD_SetBackColor(Black);LCD_SetTextColor(White);LED_Disp(0x00); //0ffI2CInit();if (EEPROM_ReadByte(0x55) != 0x11)  //第一次上电{param.PWM_Frq = 1000;   //初始化参数EEPROM_WriteByte(0x55, 0x11);HAL_Delay(10);EEPROM_WriteByte(0x01, 1);HAL_Delay(10);}else{param.PWM_Frq = EEPROM_ReadByte(0x01)*1000;}
}

LCD

封装LCD显示函数，使用可变参数列表

#include "stdio.h"
#include "string.h"
#include "stdarg.h"void LCD_Printf(uint8_t linex, char *format, ...)
{char lcd_show_text[30];memset(lcd_show_text, '\0', sizeof(lcd_show_text));va_list arg;va_start(arg, format);vsprintf(lcd_show_text, format, arg);LCD_DisplayStringLine(linex, (uint8_t *)lcd_show_text);va_end(arg);
}

LCD界面

void LCD_Disp(void)
{if (uwTick - tick.lcd < 200)return;tick.lcd = uwTick;if (flag.LCD_View == 0){LCD_Printf(Line0, "      Para");LCD_Printf(Line2, "  ADC_V:%.2fV ", param.ADC);LCD_Printf(Line4, "  State:%s  ", (flag.PWM_Mode) ? "start" : "stop" );   //三目运算符LCD_Printf(Line6, "  Siginal:PA9: %2d%%  ", (flag.PWM_Mode) ? (param.PWM_Duty_PA9) : 0);LCD_Printf(Line7, "          PB14:%2d%%  ", (flag.PWM_Mode) ? (param.PWM_Duty_PA14) :0);LCD_Printf(Line8, "          %dKHz   ", param.PWM_Frq/1000);LCD_Printf(Line9, "                   1");        }else if (flag.LCD_View == 1){LCD_Printf(Line1, "      Setting");LCD_Printf(Line5, "  Signal_Frq:%dKHz  ", param.PWM_Frq/1000);LCD_Printf(Line9, "                   2");}
}

按键

按键扫描

void Key_Read(void)
{if (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) == 0)key.value = 1;else if (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1) == 0)key.value = 2;else if (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_2) == 0)key.value = 3;else if (HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_0) == 0)key.value = 4;elsekey.value = 0;key.down = key.value & (key.value ^ key.old);key.up  = ~key.value & (key.value ^ key.old);key.old = key.value;
}

按键处理函数

void Key_Proc(void)
{if (uwTick - tick.key < 10) //10msreturn;tick.key = uwTick;Key_Read();if (key.down == 1)  //“B1”按键设定为“启动/停止”按键{flag.PWM_Mode = !flag.PWM_Mode;}if (key.down == 2){//先判断是否存入E2PROMif (flag.LCD_View == 1){//eepromEEPROM_WriteByte(0x01, param.PWM_Frq/1000); //存整数部分HAL_Delay(10);}// 再刷新界面flag.LCD_View ++;if (flag.LCD_View == 2) flag.LCD_View = 0;LCD_Clear(Black);        }if (key.down == 3){if (flag.LCD_View == 1){param.PWM_Frq += 1000;if (param.PWM_Frq > 10000)  param.PWM_Frq = 1000;}}    
}

PWM互补输出

PWM配置的定时器，给的80-1预分频，那计数值就是80M/80 = 1M

频率设置：TIMx->ARR = 1e6/频率

占空比设置：TIMx->CCRx = (1e6/频率)*占空比

我代码里的占空比只保留整数部分，所以我的CCR赋值时候最后除以100。

void PWM_Proc(void)
{if (uwTick - tick.pwm < 100)return;tick.pwm = uwTick;//计算占空比param.PWM_Duty_PA9 = (uint8_t)(param.ADC*100.0/3.3);param.PWM_Duty_PA14 = 100-param.PWM_Duty_PA9;TIM15->ARR = 1e6 / param.PWM_Frq;   //计算频率if (flag.PWM_Mode == 0) //stop{   //关闭PWM输出LED_Disp(0);HAL_TIM_PWM_Stop(&htim15, TIM_CHANNEL_1);HAL_TIMEx_PWMN_Stop(&htim15, TIM_CHANNEL_1);}else{LED_Disp(0x01);TIM15 -> CCR1 = (TIM15->ARR + 1) * param.PWM_Duty_PA9 / 100;HAL_TIM_PWM_Start(&htim15, TIM_CHANNEL_1);HAL_TIMEx_PWMN_Start(&htim15, TIM_CHANNEL_1);}
}

互补PWM的函数

//PWM开启
HAL_TIM_PWM_Start(&htim15, TIM_CHANNEL_1);
HAL_TIMEx_PWMN_Start(&htim15, TIM_CHANNEL_1);
//PWM关闭
HAL_TIM_PWM_Stop(&htim15, TIM_CHANNEL_1);
HAL_TIMEx_PWMN_Stop(&htim15, TIM_CHANNEL_1);

全部代码

hardware.c

#include "hardware.h"struct Keys key;void LED_Disp(uint8_t state)
{HAL_GPIO_WritePin(GPIOC, 0xFF00, GPIO_PIN_SET); //0ffHAL_GPIO_WritePin(GPIOC, state << 8, GPIO_PIN_RESET);HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_SET);HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET);
}void Key_Read(void)
{if (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) == 0)key.value = 1;else if (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1) == 0)key.value = 2;else if (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_2) == 0)key.value = 3;else if (HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_0) == 0)key.value = 4;elsekey.value = 0;key.down = key.value & (key.value ^ key.old);key.up  = ~key.value & (key.value ^ key.old);key.old = key.value;
}double Get_ADC(ADC_HandleTypeDef *hadc)
{uint32_t adc;HAL_ADC_Start(hadc);adc = HAL_ADC_GetValue(hadc);return adc*3.3/4040;
}

hardware.h

#ifndef __HARDWARE_H
#define __HARDWARE_H#include "stm32g4xx_hal.h"void LED_Disp(uint8_t state);
void Key_Read(void);
double Get_ADC(ADC_HandleTypeDef *hadc);struct Keys{uint8_t value;uint8_t old;uint8_t down;uint8_t up;
};
extern struct Keys key;#endif

control.c

#include "control.h"//定义变量
struct Tick tick;
struct Flag flag;
struct Param param;void power_init(void)
{LCD_Clear(Black);LCD_SetBackColor(Black);LCD_SetTextColor(White);LED_Disp(0x00); //0ffI2CInit();if (EEPROM_ReadByte(0x55) != 0x11)  //第一次上电{param.PWM_Frq = 1000;   //初始化参数EEPROM_WriteByte(0x55, 0x11);HAL_Delay(10);EEPROM_WriteByte(0x01, 1);HAL_Delay(10);}else{param.PWM_Frq = EEPROM_ReadByte(0x01)*1000;}
}void LCD_Disp(void)
{if (uwTick - tick.lcd < 200)return;tick.lcd = uwTick;if (flag.LCD_View == 0){LCD_Printf(Line0, "      Para");LCD_Printf(Line2, "  ADC_V:%.2fV ", param.ADC);LCD_Printf(Line4, "  State:%s  ", (flag.PWM_Mode) ? "start" : "stop" );   //三目运算符LCD_Printf(Line6, "  Siginal:PA9: %2d%%  ", (flag.PWM_Mode) ? (param.PWM_Duty_PA9) : 0);LCD_Printf(Line7, "          PB14:%2d%%  ", (flag.PWM_Mode) ? (param.PWM_Duty_PA14) :0);LCD_Printf(Line8, "          %dKHz   ", param.PWM_Frq/1000);LCD_Printf(Line9, "                   1");        }else if (flag.LCD_View == 1){LCD_Printf(Line1, "      Setting");LCD_Printf(Line5, "  Signal_Frq:%dKHz  ", param.PWM_Frq/1000);LCD_Printf(Line9, "                   2");}
}void Key_Proc(void)
{if (uwTick - tick.key < 10) //10msreturn;tick.key = uwTick;Key_Read();if (key.down == 1)  //“B1”按键设定为“启动/停止”按键{flag.PWM_Mode = !flag.PWM_Mode;}if (key.down == 2){//先判断是否存入E2PROMif (flag.LCD_View == 1){//eepromEEPROM_WriteByte(0x01, param.PWM_Frq/1000); //存整数部分HAL_Delay(10);}// 再刷新界面flag.LCD_View ++;if (flag.LCD_View == 2) flag.LCD_View = 0;LCD_Clear(Black);        }if (key.down == 3){if (flag.LCD_View == 1){param.PWM_Frq += 1000;if (param.PWM_Frq > 10000)  param.PWM_Frq = 1000;}}    
}void ADC_Proc(void)
{if (uwTick - tick.adc < 250)return;tick.adc = uwTick;param.ADC = Get_ADC(&hadc2);
}void PWM_Proc(void)
{if (uwTick - tick.pwm < 100)return;tick.pwm = uwTick;//计算占空比param.PWM_Duty_PA9 = (uint8_t)(param.ADC*100.0/3.3);param.PWM_Duty_PA14 = 100-param.PWM_Duty_PA9;TIM15->ARR = 1e6 / param.PWM_Frq;   //计算频率if (flag.PWM_Mode == 0) //stop{   //关闭PWM输出LED_Disp(0);HAL_TIM_PWM_Stop(&htim15, TIM_CHANNEL_1);HAL_TIMEx_PWMN_Stop(&htim15, TIM_CHANNEL_1);}else{LED_Disp(0x01);TIM15 -> CCR1 = (TIM15->ARR + 1) * param.PWM_Duty_PA9 / 100;HAL_TIM_PWM_Start(&htim15, TIM_CHANNEL_1);HAL_TIMEx_PWMN_Start(&htim15, TIM_CHANNEL_1);}
}

control.h

#ifndef __CONTROL_H
#define __CONTROL_H#include "stm32g4xx_hal.h"
#include "string.h"
#include "stdio.h"
#include "stdbool.h"#include "hardware.h"
#include "i2c_hal.h"
#include "tim.h"
#include "adc.h"
#include "lcd.h"//-----------------------
void power_init(void);
void LCD_Disp(void);
void Key_Proc(void);
void ADC_Proc(void);
void PWM_Proc(void);//-----------------------
struct Tick{uint32_t lcd;uint32_t key;uint32_t adc;uint32_t pwm;};
extern struct Tick tick;struct Flag{bool PWM_Mode;uint8_t LCD_View;};
extern struct Flag flag;struct Param{double ADC;uint16_t PWM_Frq;       //频率uint8_t  PWM_Duty_PA9;uint8_t  PWM_Duty_PA14;};
extern struct Param param;
//-----------------------#endif

main.c

/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "adc.h"
#include "tim.h"
#include "gpio.h"/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */#include "control.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);
/* USER CODE BEGIN PFP *//* USER CODE END PFP *//* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 *//* USER CODE END 0 *//*** @brief  The application entry point.* @retval int*/
int main(void)
{/* USER CODE BEGIN 1 *//* 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();/* USER CODE BEGIN SysInit *//* USER CODE END SysInit *//* Initialize all configured peripherals */MX_GPIO_Init();MX_TIM6_Init();MX_ADC2_Init();MX_TIM15_Init();/* USER CODE BEGIN 2 */LCD_Init();/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */power_init();while (1){Key_Proc();LCD_Disp();ADC_Proc();PWM_Proc();/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}/* USER CODE END 3 */
}

完结，第六届国赛比较简单，只有PWM互补输出是没有写过的

后续会更新其他届的赛题，同步源码到我的Gitee~

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