前言：STM32G431RBT6实现嵌入式组第七届题目解析+源码，本文默认读者具备基础的stm32知识。文章末尾有第七届题目。

1.题目解析

1.1 分而治之，藕断丝连

还是那句话，将不同模块进行封装，通过变量进行模块间的合作。

1.2 模块化思维导图

下图根据题目梳理。第六届没有写这么详细（主要是懒😀）。

1.3 模块解析

整合模块，逻辑思维。

1.3.1 KEY模块

B1：界面1，2之间切换，方法：计数；0：表示界面1，1：表示界面2。
B2：三种阈值位之间切换，方法：计数；0：表示T1，1：表示T2，2：表示T3。
B3：每次加5，上限95（各阈值之间还应该T1<T2<T3， 但是我没写😅）。
B4：每次减5，下限5。

//B1，B4，B3都是同样的格式
if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) == GPIO_PIN_RESET) //B1{if(HAL_GetTick() - tick > KEY_REDUCTION){    //按键消抖tick = HAL_GetTick();keyS->bits.B1 ^= 1;    
//            keyS->bits.B1++;
//            if(keyS->bits.B1 == 2) keyS->bits.B1 = 0;while(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) == GPIO_PIN_RESET); //实现按下一次只计数一次}}
//B2多了一种状态
else if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1) == GPIO_PIN_RESET) //B2{if(HAL_GetTick() - tick > KEY_REDUCTION){tick = HAL_GetTick();keyS->bits.B2++;if(keyS->bits.B2 == 3) keyS->bits.B2 = 0;while(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1) == GPIO_PIN_RESET);}}

1.3.2 ADC模块

采集可调电位器电压。默认10次为一组进行一次滤波。
假如使用0.2s时基来开启adc采集，采集10次需2s响应太慢，放在systick中断中，程序写到后面时间1ms显短，我就多使用了一个tim产生0.5s时基，不用白不用。也可使用一个0.5的就行，累计4次就执行一次需0.2s时基模块。也可使用dma采集。

void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc)
{if(adc_smp_flag < (FILTER_LEN+1)){adc_smp_flag++;adc_smp_vtg.smp_val[adc_smp_flag] = HAL_ADC_GetValue(hadc);if(adc_smp_flag == (FILTER_LEN+1)){adc_smp_flag =0;filter_process(&adc_smp_vtg);    //累加相除}}
}typedef struct{uint32_t smp_val[FILTER_LEN];uint32_t filter_val;
} adc_smp_t;

1.3.3 IIC模块

完成eeprom中数据的读写。开发板的PB6和PB7设置为开漏输出，使用软件模拟实现单字节数据的读写。注意：魔术棒->c\c+±>optimization选项要设置成-O0，要不然代码执行后得不到想要的结果。

具体实现看第二部分源码。

/* 软件模拟实现at24c02单字节写入 */
void at24c02_write(uint8_t addr, uint8_t data){...
}/* 软件模拟实现at24c02单字节读取 */
uint8_t at24c02_read(uint8_t addr){...
}/* i2c向eeprom写入data */
void iic_write()
{...
}
...

1.3.4 UART模块

UART接收PC端查询码’C’, ‘S’，做出相应的回应。
具体实现看第二部分源码。

//中断触发回调函数
void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size)
{...
}
//定时上报数据
void uart_inform_PC()
{...
}

1.3.5 LCD模块

将涉及到的数据显示到lcd屏幕上，份界面1和界面2。
具体实现看第二部分源码。

void lcd_process()
{if{//1：if 界面1，2切换清屏//2：LCD显示数据//3：if设置阈值成功后切换到界面1，将set_thros写入eeprom}else{//1：if 界面1，2切换清屏//2：if 显示thros1为绿色+设置该阈值//3：else if 显示thros2为绿色+设置该阈值//4：else if 显示thros3为绿色+设置该阈值}
}

1.3.6 LED模块

这届题目我感觉难度就在led的处理上面，看着题目要求非常简单，正常思路当事件发生的时候，使用HAL_GPIO_TogglePin()翻转led对应引脚电平就行，但是我们使用到了lcd屏幕，lcd屏幕也使用到PC8-PC15这些引脚，所以我们每次写入led状态的时候对其他led引脚也得考虑。我就被绕进去了，整了我2个多小时。还是因为逻辑思维不够强，代码写少了😶。

三种事件相互之间保持独立。我们分析一下三个事件之间的关系：
LD1：每隔1s亮灭闪烁，事件周期性触发。
LD2：0.2s间隔闪烁5次，但是事件触发没有周期性，液位等级变化触发一次。
LD3：0.2s间隔闪烁5次，但是事件触发没有周期性，接收到查询指令触发一次。
所以三事件相互独立，可能同时触发，可以一次触发其中的随机两个，也可能是一个，也可能是都没发生。所以这样就构成了8种情况。
我们假设一个uint8_t temp变量，LD1代表第1位（事件1），LD2代表第2位（事件2），LD3代表第3位（事件3），对应位置1表示该事件发生，需执行该事件。这样我就得到了8种情况：
111：代表三种事件同时发生；
110：代表事件3，事件2发生；
依此类推…
000：代表都不发生。
最后根据这八种情况写入对应的电平状态就可以了。

void led_process()
{uint8_t temp = 0;uint8_t new_liq_level = liq_level_process(iic_liq_thros);ld1_tim_flag++;if(ld1_tim_flag == 5){temp |= 1;     ld1_state_flag ^= 1;}if(old_liq_level != new_liq_level){temp |= 2;ld2_tim_flag++;ld2_state_flag ^= 1;if(ld2_tim_flag == 1) uart_inform_PC(new_liq_level);}if(uart_rec_flag == 1){temp |= 4;ld3_tim_flag++;ld3_state_flag ^= 1;}HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_SET);if(temp == 0) GPIOC->ODR = 0xff00;else if(temp == 1){        GPIOC->ODR = 0xfe00 ^ (ld1_state_flag << 8);}else if(temp == 2){GPIOC->ODR = 0xfd00 ^ (ld2_state_flag << 9);}else if(temp == 3){GPIOC->ODR = 0xfc00 ^ ((ld1_state_flag + (ld2_state_flag << 1)) << 8);}else if(temp == 4){GPIOC->ODR = 0xfb00 ^ (ld3_state_flag << 10);       }else if(temp == 5){GPIOC->ODR = 0xfa00 ^ ((ld1_state_flag + (ld3_state_flag << 2)) << 8);}else if(temp == 6){GPIOC->ODR = 0xfa00 ^ (((ld2_state_flag<<1) + (ld3_state_flag << 2)) << 8);}else if(temp == 7){GPIOC->ODR = 0xfa00 ^ ((ld1_state_flag + (ld2_state_flag<<1) + (ld3_state_flag << 2)) << 8);  }HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET);//事件完成之后结束设置对应标志位。if(ld1_tim_flag == 5){ld1_tim_flag = 0;}if(ld2_tim_flag == 10){old_liq_level = new_liq_level;ld2_tim_flag = 0;}if(ld3_tim_flag == 10){uart_rec_flag = 0;ld3_tim_flag = 0;}
}

1.3.7 TIM模块

170MHz的频率，预分频值填写16，重装载寄存器填写1999999实现0.2s时基；
预分频值填写16，重装载寄存器填写499999实现0.05s时基。
0.2s的时基，用在led模块。
0.05s的时基用在uart，adc上。
具体实现看第二部分源码。

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{static uint8_t test_val = 0;if(htim == &htim2)   //tim2{led_process();    //led处理函数}else{     //tim3HAL_ADC_Start_IT(&hadc2);HAL_UARTEx_ReceiveToIdle_IT(&huart1, &uart_rec_char, 1);}
}

2.源码

我所有的实现都在main.c文件中。

/* USER CODE BEGIN Header */
/********************************************************************************* @file           : main.c* @brief          : Main program body******************************************************************************* @attention** Copyright (c) 2025 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 "tim.h"
#include "usart.h"
#include "gpio.h"/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "stdio.h"
#include "i2c_hal.h"
#include "lcd.h"
/* USER CODE END Includes *//* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD *//* USER CODE END PTD *//* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#define FILTER_LEN 10
#define KEY_REDUCTION 20
/* 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 */
typedef struct{uint32_t smp_val[FILTER_LEN];uint32_t filter_val;
} adc_smp_t;
adc_smp_t adc_smp_vtg = {0};        //将ADC采集的数据收集FILTER_LEN个，之后会进行均值滤波typedef union{uint8_t keys;struct{uint8_t B1:2;uint8_t B2:2;uint8_t B3:2;uint8_t B4:2;}bits;
}key_state_t;
key_state_t key_state = {0};       //表示按键状态/*
adc_smp_flag：保证采集FILTER_LEN个数据之后进行滤波
key_add_sub_flag， b3_b4_flag：控制按键B3,B4加减操作。
lcd_clear_flag：在界面1和界面2之间切换时候的清屏标志位。
set_thros_flag：B1按下返回界面1后，设置阈值成功，将设置阈值写入eeprom
uart_rec_flag：接收到pc查询指令后，控制ld3标志
old_liq_level：记住上一次的level值，通知pc端时知道是U还是D，还有配合控制ld2
*/
uint8_t adc_smp_flag = 0, key_add_sub_flag = 100, b3_b4_flag = 100, lcd_clear_flag = 0, set_thros_flag = 0, uart_rec_flag = 0, old_liq_level = 0;
/* 在lcd上显示数据，配合sprinf使用 */
char lcd_HOR[30] = {0}, lcd_thros[30] = {0}, uart_resp[30] = {0};
/*iic_liq_thros：实时值set_thros：更改阈值时做中间值
*/
uint8_t iic_liq_thros[3] = {30, 50, 70}, set_thros[3] = {0};
/*ldi_tim_flag：0.2s加一，控制ldi闪烁次数ldi_state_flag：改变对应ldi的状态标志，对应周期等间隔1010...交替变化
*/
uint16_t ld1_tim_flag = 0,   ld2_tim_flag = 0,   ld3_tim_flag = 0,ld1_state_flag = 0, ld2_state_flag = 0, ld3_state_flag = 0;
/* 接收pc端发来的查询信号 */
uint8_t uart_rec_char;void filter_process(adc_smp_t *adcSmp);
void lcd_process();
void at24c02_write(uint8_t addr, uint8_t data);
uint8_t at24c02_read(uint8_t addr);
void iic_write(uint8_t* data);
void iic_read(uint8_t* data);
void key_process(key_state_t *keyS);
void set_thros_process(uint8_t *des, uint8_t index);
void led_process();
uint8_t cmp_thros(uint8_t *a);
uint32_t liq_level_process(uint8_t* liq_thros);
void iic1_process();
void uart_inform_PC(uint8_t level);
/* 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 */LCD_Init();LCD_Clear(Black);/* 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_ADC2_Init();MX_TIM2_Init();MX_TIM3_Init();MX_USART1_UART_Init();/* USER CODE BEGIN 2 */HAL_TIM_Base_Start_IT(&htim2);    //tim2产生200ms时基HAL_TIM_Base_Start_IT(&htim3);    //tim3产生50ms时基HAL_ADC_Start_IT(&hadc2);HAL_UARTEx_ReceiveToIdle_IT(&huart1, &uart_rec_char, 1);//检查eeprom对应数据内存中数据是否符合要求，应对第一次在板子下载该程序，eeprom对应内存位置数据不正确的问题iic_read(set_thros);if(cmp_thros(set_thros)){iic_write(iic_liq_thros);}else{iic_read(iic_liq_thros); }for(int i=0;i<3;i++){set_thros[i] = iic_liq_thros[i];}   old_liq_level = liq_level_process(iic_liq_thros);/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){/* USER CODE END WHILE *//* USER CODE BEGIN 3 */key_process(&key_state);lcd_process();}/* 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*/HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1_BOOST);/** Initializes the RCC Oscillators according to the specified parameters* in the RCC_OscInitTypeDef structure.*/RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;RCC_OscInitStruct.HSEState = RCC_HSE_ON;RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV6;RCC_OscInitStruct.PLL.PLLN = 85;RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;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_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK){Error_Handler();}
}/* USER CODE BEGIN 4 */
/*
void lcd_process()
{if{1：if 界面1，2切换清屏2：LCD显示数据3：if设置阈值成功后切换到界面1，将set_thros写入eeprom}else{1：if 界面1，2切换清屏2：if 显示thros1为绿色+设置该阈值3：else if 显示thros2为绿色+设置该阈值4：else if 显示thros3为绿色+设置该阈值}
}
*/
void lcd_process()
{if(key_state.bits.B1 == 0){if(lcd_clear_flag == 0){LCD_Clear(Black);lcd_clear_flag = 1;}LCD_DisplayStringLine(Line1, "  Liquid Level");sprintf(lcd_HOR, "  Height:%dcm", adc_smp_vtg.filter_val*100/4096);LCD_DisplayStringLine(Line2, (uint8_t*)lcd_HOR);sprintf(lcd_HOR, "  ADC:%.2fV", adc_smp_vtg.filter_val*3.3/4096);LCD_DisplayStringLine(Line3, (uint8_t*)lcd_HOR);sprintf(lcd_HOR, "  Level: %d", liq_level_process(iic_liq_thros));LCD_DisplayStringLine(Line4, (uint8_t*)lcd_HOR);if(set_thros_flag==1){set_thros_flag = 0;iic_write(set_thros);iic_read(iic_liq_thros);}}else{if(lcd_clear_flag == 1){LCD_Clear(Black);lcd_clear_flag = 0;}LCD_DisplayStringLine(Line1, "    Parameter Setup");if(key_state.bits.B2 == 0){LCD_SetTextColor(Green);sprintf(lcd_thros, "  Throsouth 1:%2dcm", set_thros[0]);LCD_DisplayStringLine(Line3, (uint8_t*)lcd_thros);LCD_SetTextColor(Black);sprintf(lcd_thros, "  Throsouth 2:%2dcm", set_thros[1]);LCD_DisplayStringLine(Line4, (uint8_t*)lcd_thros);sprintf(lcd_thros, "  Throsouth 2:%2dcm", set_thros[2]);LCD_DisplayStringLine(Line5, (uint8_t*)lcd_thros);if(b3_b4_flag != key_add_sub_flag){set_thros_process(set_thros, 0);}}else if(key_state.bits.B2 == 1){sprintf(lcd_thros, "  Throsouth 1:%2dcm", set_thros[0]);LCD_DisplayStringLine(Line3, (uint8_t*)lcd_thros);LCD_SetTextColor(Green);sprintf(lcd_thros, "  Throsouth 2:%2dcm", set_thros[1]);LCD_DisplayStringLine(Line4, (uint8_t*)lcd_thros);LCD_SetTextColor(Black);sprintf(lcd_thros, "  Throsouth 2:%2dcm", set_thros[2]);LCD_DisplayStringLine(Line5, (uint8_t*)lcd_thros);if(b3_b4_flag != key_add_sub_flag){ set_thros_process(set_thros, 1);}}else if(key_state.bits.B2 == 2){sprintf(lcd_thros, "  Throsouth 1:%2dcm", set_thros[0]);LCD_DisplayStringLine(Line3, (uint8_t*)lcd_thros);sprintf(lcd_thros, "  Throsouth 2:%2dcm", set_thros[1]);LCD_DisplayStringLine(Line4, (uint8_t*)lcd_thros);LCD_SetTextColor(Green);sprintf(lcd_thros, "  Throsouth 2:%2dcm", set_thros[2]);LCD_DisplayStringLine(Line5, (uint8_t*)lcd_thros);LCD_SetTextColor(Black);if(b3_b4_flag != key_add_sub_flag){ set_thros_process(set_thros, 2);}}}}/* 软甲模拟iic协议写入1byte */
void at24c02_write(uint8_t addr, uint8_t data)
{I2CStart();I2CSendByte(0xa0);I2CWaitAck();I2CSendByte(addr);I2CWaitAck();I2CSendByte(data);I2CWaitAck();I2CStop();
}
/* 软件模拟iic协议读取1byte */
uint8_t at24c02_read(uint8_t addr)
{uint8_t data;I2CStart();I2CSendByte(0xa0);I2CWaitAck();I2CSendByte(addr);I2CWaitAck();I2CStart();I2CSendByte(0xa1);I2CWaitAck();data = I2CReceiveByte();I2CSendNotAck();I2CStop();return data;
}/* 写入数据 */
void iic_write(uint8_t* data)
{for(int i=0; i<3; i++){at24c02_write(i, data[i]);HAL_Delay(3);}
}/* 读取数据 */
void iic_read(uint8_t* data)
{uint8_t temp = 0;for(int i=0; i<3; i++){temp = at24c02_read(i);data[i] = temp;HAL_Delay(3);}
}/* 验证读出数据是否正常 */
uint8_t cmp_thros(uint8_t *a)
{for(int i=0; i<3; i++){if(a[i] < 5 || a[i] > 95) return 1;}return 0;
}/* 检测液深等级 */
uint32_t liq_level_process(uint8_t* liq_thros)
{uint32_t temp = adc_smp_vtg.filter_val*100/4096;if(temp <= liq_thros[0]) return 0;else if(temp > liq_thros[0] && temp <= liq_thros[1]) return 1;else if(temp > liq_thros[1] && temp <= liq_thros[2]) return 2;else return 3;
}/* 读取Bi按键状态 */
void key_process(key_state_t *keyS)
{uint32_t tick = 0;if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) == GPIO_PIN_RESET) //B1{if(HAL_GetTick() - tick > KEY_REDUCTION){tick = HAL_GetTick();keyS->bits.B1 ^= 1;
//            keyS->bits.B1++;
//            if(keyS->bits.B1 == 2) keyS->bits.B1 = 0;while(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) == GPIO_PIN_RESET);}}else if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1) == GPIO_PIN_RESET) //B2{if(HAL_GetTick() - tick > KEY_REDUCTION){tick = HAL_GetTick();keyS->bits.B2++;if(keyS->bits.B2 == 3) keyS->bits.B2 = 0;while(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1) == GPIO_PIN_RESET);}}else if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_2) == GPIO_PIN_RESET) //B3{if(HAL_GetTick() - tick > KEY_REDUCTION){tick = HAL_GetTick();keyS->bits.B3 ^= 1;
//            keyS->bits.B3++;
//            if(keyS->bits.B3 == 2) keyS->bits.B3 = 0;key_add_sub_flag++;while(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_2) == GPIO_PIN_RESET);}}else if(HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_0) == GPIO_PIN_RESET) //B1{if(HAL_GetTick() - tick > KEY_REDUCTION){tick = HAL_GetTick();keyS->bits.B4 ^= 1;
//            keyS->bits.B4++;
//            if(keyS->bits.B4 == 2) keyS->bits.B4 = 0;key_add_sub_flag--;while(HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_0) == GPIO_PIN_RESET);}}
}/* 设置阈值 */
void set_thros_process(uint8_t *des, uint8_t index)
{if(key_add_sub_flag>b3_b4_flag && (des[index]>=5 && des[index]<=95)){        des[index] += 5;if(des[index] == 100) des[index] = 95;}else if(key_add_sub_flag<b3_b4_flag && (des[index]>=5 && des[index]<=95)){des[index] -= 5;if(des[index] == 0) des[index] = 5;}set_thros_flag = 1;b3_b4_flag = key_add_sub_flag;}/* 
void led_process()
{1：前面3if设置3种事件是否发生2：3种事件相互组合形成8种混合事件3：最后3if设置相关标志位
}
*/
void led_process()
{uint8_t temp = 0;uint8_t new_liq_level = liq_level_process(iic_liq_thros);ld1_tim_flag++;if(ld1_tim_flag == 5){temp |= 1;     ld1_state_flag ^= 1;}if(old_liq_level != new_liq_level){temp |= 2;ld2_tim_flag++;ld2_state_flag ^= 1;if(ld2_tim_flag == 1) uart_inform_PC(new_liq_level);}if(uart_rec_flag == 1){temp |= 4;ld3_tim_flag++;ld3_state_flag ^= 1;}HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_SET);if(temp == 0) GPIOC->ODR = 0xff00;else if(temp == 1){        GPIOC->ODR = 0xfe00 ^ (ld1_state_flag << 8);}else if(temp == 2){GPIOC->ODR = 0xfd00 ^ (ld2_state_flag << 9);}else if(temp == 3){GPIOC->ODR = 0xfc00 ^ ((ld1_state_flag + (ld2_state_flag << 1)) << 8);}else if(temp == 4){GPIOC->ODR = 0xfb00 ^ (ld3_state_flag << 10);       }else if(temp == 5){GPIOC->ODR = 0xfa00 ^ ((ld1_state_flag + (ld3_state_flag << 2)) << 8);}else if(temp == 6){GPIOC->ODR = 0xfa00 ^ (((ld2_state_flag<<1) + (ld3_state_flag << 2)) << 8);}else if(temp == 7){GPIOC->ODR = 0xfa00 ^ ((ld1_state_flag + (ld2_state_flag<<1) + (ld3_state_flag << 2)) << 8);  }HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET);if(ld1_tim_flag == 5){ld1_tim_flag = 0;}if(ld2_tim_flag == 10){old_liq_level = new_liq_level;ld2_tim_flag = 0;}if(ld3_tim_flag == 10){uart_rec_flag = 0;ld3_tim_flag = 0;}
}/* 向pc端发送数据 */
void uart_inform_PC(uint8_t level)
{if(old_liq_level<level){sprintf(uart_resp, "A:H%2d+L%1d+U\r\n", adc_smp_vtg.filter_val*100/4096, liq_level_process(iic_liq_thros));HAL_UART_Transmit_IT(&huart1, (uint8_t*)uart_resp, 12);}else if(old_liq_level>level){sprintf(uart_resp, "A:H%2d+L%1d+D\r\n", adc_smp_vtg.filter_val*100/4096, liq_level_process(iic_liq_thros));HAL_UART_Transmit_IT(&huart1, (uint8_t*)uart_resp, 12);}
}/* 定时器时基中断回调函数 */
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{static uint8_t test_val = 0;if(htim == &htim2){led_process();}else{HAL_ADC_Start_IT(&hadc2);HAL_UARTEx_ReceiveToIdle_IT(&huart1, &uart_rec_char, 1);}}/* uart接收事件中断回调函数 */
void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size)
{if(uart_rec_char == 'C'){uart_rec_flag = 1;sprintf(uart_resp, "C:H%2d+L%1d\r\n", adc_smp_vtg.filter_val*100/4096, liq_level_process(iic_liq_thros));HAL_UART_Transmit_IT(huart, (uint8_t*)uart_resp, 9);}else if(uart_rec_char == 'S'){uart_rec_flag = 1;sprintf(uart_resp, "S:TL%2d+TM%2d+TH%2d\r\n", iic_liq_thros[0], iic_liq_thros[1], iic_liq_thros[2]);HAL_UART_Transmit_IT(huart, (uint8_t*)uart_resp, 18);}
}/* adc规则组转换完成中断回调函数 */
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc)
{if(adc_smp_flag < (FILTER_LEN+1)){adc_smp_flag++;adc_smp_vtg.smp_val[adc_smp_flag] = HAL_ADC_GetValue(hadc);if(adc_smp_flag == (FILTER_LEN+1)){adc_smp_flag =0;filter_process(&adc_smp_vtg);}}
}/* adc采集值进行滤波 */
void filter_process(adc_smp_t *adcSmp)
{uint32_t temp = 0;for(int i=0;i<FILTER_LEN;i++){temp += adcSmp->smp_val[i];}adcSmp->filter_val = temp/10;}/* 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 */

3.第七届题目