目录
0 题目介绍
具体要求如下图
1 题目分析
拿到题目咋一看，就是基本操作，实际做起来一堆定时器操作，很容易把人绕晕。
首先看看需要用到的外设
1. GPIO(key/led)
2.LCD
3.输入捕获（TIM3通道2）和PWM（TIM2通道2）
4.ADC(R37)
这里首先得有个概念，碰到定时之类的，应该想到标志位+计数器的组合，用标志位触发定时器计数，把开始的过程和最终执行的过程分离开来，减少代码耦合。
2 Cubemx配置
配置完成如下：
时钟树配置如下（确保SYSCLK=80M）
GPIO配置过（LED设置INPUT初始状态高，PD12使能位INPUT，KEY设置位OUTPUT）
ADC配置如下
定时器2 TIM2通道二（PWM输出配置PA1）这里80M预分频79后为1M，初始阶段频率1M/(999+1)=1Khz（题目要求4000，后面代码里具体设置）
定时器3 TIM3通道二（输入捕获输出配置PA7）
这里简单介绍一下：触发源选TI2FP2（因为PA7是TIM3_CH2），选这个后PA7就会变绿，时钟选内部时钟（80M），通道二（Channel）作为主通道（PA7对的是通道二），通道一作为从通道。
主通道（通道2）检测上升沿，从通道（通道1）检测下降沿（计算频率只需要计算上升沿的捕获值，计算占空比根据上升沿和下降沿的比例关系计算）。
预分频还是79（+1）后到1M。
tim2中断打开（整个题目唯一用到的中断）
生成文件
移植lcd相关文件头文件，创建一个user.c和user.h(个人习惯)放一些功能代码，主要代码全写在main.c文件中（如果缺少.s文件，请自行添加）
编译保证不报错。
4 代码
自己需要写的文件只有两个
1. user.c和user.h
2.main.c
user文件如下，这个没啥好说的
user.h：
#include "main.h"
void Led_Disp(unsigned char c);
unsigned char Key_Scan(void);
uint16_t getADC2(void);
user.c：
#include "user.h"
#include "adc.h"
//灯
void Led_Disp(unsigned char c)
{
//全部熄灭
HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15|GPIO_PIN_8
|GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12, GPIO_PIN_SET);
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_SET);
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET);
//点亮对应位
HAL_GPIO_WritePin(GPIOC, c<<8, GPIO_PIN_RESET);
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_SET);
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET);
}
//按键扫描
unsigned char Key_Scan(void)
{
unsigned char c;
if(HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_0)==GPIO_PIN_RESET)
{
c = 1;
}
else if(HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_1)==GPIO_PIN_RESET)
{
c = 2;
}
else if(HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_2)==GPIO_PIN_RESET)
{
c = 3;
}
else if(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_0)==GPIO_PIN_RESET)
{
c = 4;
}
return c;
}
//adc
uint16_t getADC2(void)
{
uint16_t adc = 0;
HAL_ADC_Start(&hadc2);
adc = HAL_ADC_GetValue(&hadc2);
return adc;
}
主函数这里使用了一个100ms执行一次的计数器和50ms执行一次的计数器，100ms主要控制那个灯闪烁的需求，其他定时都放在50ms函数中。
可以根据测试数据来观察定时器的作用
timer_b2是按键2相关的计时器， timer_b4是按键4相关的计时器，timer_MH是题目那个保持2s需求的计时器
flag是对应的标志位，具体功能见注释
屏幕第九行是adc电压值和cap采集的频率
main.c
#include "main.h"
#include "adc.h"
#include "tim.h"
#include "gpio.h"
#include "lcd.h"
#include "user.h"
#include <stdio.h>
void keyPro(void);
void lcdPro(void);
void ledPro(void);
void ADCPro(void);
void timer_100(void);
void timer_50(void);
//tim2 pwm
//tim3 cap
__IO uint32_t uwtick_Key,uwtick_Lcd,uwtick_Led,uwtick_ADC,uwtick_timer_200,uwtick_timer_100,uwtick_timer_50;
//key
unsigned char Key_Value,Key_Old,Key_Up,Key_Dowm;
unsigned char page = 1;
//lcd
unsigned char str[25];
unsigned char test;
//*pwm相关变量
unsigned char PWM_Mode = 0;
unsigned char PWM_p = 0;
float V = 10; //V值
float V_old = 10; //上一次的V值，用于判断V是否稳定
uint16_t CAP1_UP_Count; //上升沿捕获值
uint16_t CAP1_DOWM_Count; //下降沿捕获值
float CAP1_Duty; //捕获占空比
int32_t PWM1_Duty = 10; //PWM输出占空比控制
int32_t PWM1_F = 249; //PWM输出频率控制
unsigned char R = 1; //R
unsigned char K = 1; //K
unsigned char N = 0; //N
float MH = 10; //低频最大值
float ML = 10; //高频最大值
unsigned char select_R_K = 0; //选择R K
unsigned char lock_b4 = 0; //ADC上锁
float adc_value = 0; //ADC值
//timer
int timer_b2 = 0;
int timer_b4 = 0;
int timer_MH = 0;
int timer_ML = 0;
//标志位
unsigned flag_b2 = 0; //1代表正在运行中
int flag_b4 = 0; //0 没有按下 1上升沿 2下降沿
int flag_MHL = 0; //0没超过 1低超过 2高超过
void SystemClock_Config(void);
int main(void)
{
HAL_Init();
SystemClock_Config();
LCD_Init();
MX_GPIO_Init();
MX_ADC2_Init();
MX_TIM2_Init();
MX_TIM3_Init();
//cap
HAL_TIM_Base_Start(&htim3);
HAL_TIM_IC_Start_IT(&htim3,TIM_CHANNEL_1);
HAL_TIM_IC_Start_IT(&htim3,TIM_CHANNEL_2);
//pwm
HAL_TIM_PWM_Start(&htim2,TIM_CHANNEL_2);
__HAL_TIM_SET_AUTORELOAD(&htim2,124); //4k=249 8k=124
//__HAL_TIM_SET_COMPARE(&htim2,TIM_CHANNEL_2,124/10);
LCD_Clear(Black);
LCD_SetBackColor(Black);
LCD_SetTextColor(White);
while (1)
{
ADCPro();
lcdPro();
keyPro();
ledPro();
timer_100();//灯闪烁时用
timer_50();
}
}
void lcdPro(void)
{
if(uwTick - uwtick_Lcd<100) return;
uwtick_Lcd = uwTick;
if(page == 1) //数据界面
{
sprintf((char *)str," DATA ");
LCD_DisplayStringLine(Line1,str);
if(PWM_Mode == 0)
{
sprintf((char *)str," M=L ");
}
else
{
sprintf((char *)str," M=H ");
}
PWM_p = PWM1_Duty;
LCD_DisplayStringLine(Line3,str);
sprintf((char *)str," P=%02d%% ",PWM_p);
LCD_DisplayStringLine(Line4,str);
sprintf((char *)str," V=%3.1f ",V);
LCD_DisplayStringLine(Line5,str);
}
else if(page == 2) //参数界面
{
sprintf((char *)str," PARA ");
LCD_DisplayStringLine(Line1,str);
if(select_R_K == 0)
{
LCD_SetTextColor(Green);
}
sprintf((char *)str," R=%d ",R);
LCD_DisplayStringLine(Line3,str);
LCD_SetTextColor(White); //恢复
if(select_R_K == 1)
{
LCD_SetTextColor(Green);
}
sprintf((char *)str," K=%d ",K);
LCD_DisplayStringLine(Line4,str);
LCD_SetTextColor(White); //恢复
}
else if (page == 3) //统计界面
{
sprintf((char *)str," RECD ");
LCD_DisplayStringLine(Line1,str);
sprintf((char *)str," N=%d ",N);
LCD_DisplayStringLine(Line3,str);
sprintf((char *)str," MH=%4.1f ",MH);
LCD_DisplayStringLine(Line4,str);
sprintf((char *)str," ML=%4.1f ",ML);
LCD_DisplayStringLine(Line5,str);
}
//测试用 提交时屏蔽
sprintf((char *)str,"t1:%dt2:%dt3:%dt4:%d ",timer_b2,timer_b4,timer_ML,timer_MH);
LCD_DisplayStringLine(Line7,str);
sprintf((char *)str,"b2:%d b4:%d MHL:%d ",flag_b2,flag_b4,flag_MHL);
LCD_DisplayStringLine(Line8,str);
//adc
sprintf((char *)str, "R37:%4.2fV PWM:%d ",adc_value,1000000/CAP1_UP_Count);
LCD_DisplayStringLine(Line9, str);
}
void keyPro(void)
{
if(uwTick - uwtick_Key<50) return;
uwtick_Key = uwTick;
Key_Value = Key_Scan();
Key_Dowm = Key_Value&(Key_Value^Key_Old);
Key_Up = ~Key_Value&(Key_Value^Key_Old);
if(Key_Value==4&&Key_Old==4&&page==1)
{
flag_b4 = 1;
}
else if(Key_Value!=4&&Key_Old==4&&page==1)
{
flag_b4 = 2;
}
else
{
flag_b4 = 0;
}
Key_Old = Key_Value;
if(Key_Dowm == 1)
{
LCD_Clear(Black);
if(page == 1)
{
page = 2;
}
else if(page == 2)
{
page = 3;
}
else
{
page = 1;
}
}
else if(Key_Dowm == 2)
{
if(page == 1) //数据界面
{
if(flag_b2 == 0)
{
flag_b2 =1;
}
}
if(page == 2) //参数界面
{
if(select_R_K == 0)
{
select_R_K = 1;
}
else
{
select_R_K = 0;
}
}
}
else if(Key_Dowm == 3)
{
if(page == 2)
{
if(select_R_K == 0) //R++
{
R++;
if(R>10)
{
R=1;
}
}
else //K++
{
K++;
if(K>10)
{
K=1;
}
}
}
}
else if(Key_Dowm == 4)
{
if(page == 2)
{
if(select_R_K == 0) //R--
{
R--;
if(R==0)
{
R=10;
}
}
else //K--
{
K--;
if(K==0)
{
K=10;
}
}
}
}
}
//定时相关处理 50ms/次
void timer_50(void)
{
if(uwTick - uwtick_timer_50<50) return;
uwtick_timer_50 = uwTick;
//时间累加
if(flag_b4==1)
{
timer_b4+=50;
}
if(flag_b2 == 1)
{
timer_b2+=50;
if(PWM_Mode ==1)//4000-8000对应249-124 125/5次
{
PWM1_F += 2;
if(PWM1_F>249)
{
PWM1_F = 249;
}
}
else
{
PWM1_F -= 2;
if(PWM1_F<124)
{
PWM1_F=124;
}
}
}
if(flag_MHL == 1)
{
timer_ML+=50;
}
else if(flag_MHL == 2)
{
timer_MH+=50;
}
else
{
timer_ML = 0;
timer_MH = 0;
}
//判断执行
//b4长短按2s
if(flag_b4==2)
{
if(page==1&&timer_b4>2000)//长按
{
if(lock_b4 == 0)
{
lock_b4 = 1;
}
}
else //短按
{
if(page==1&&lock_b4 == 1)
{
lock_b4 = 0;
}
}
}
else if(flag_b4==0)
{
timer_b4 = 0;
}
//b2记时5s PWM高低模式切换
if(flag_b2 == 1&&timer_b2>5000)
{
flag_b2 = 0;
timer_b2 = 0;
N++;
if(PWM_Mode == 0)
{
PWM_Mode = 1;
}
else
{
PWM_Mode = 0;
}
}
//MH2s
if(timer_MH>2000)//低频最大值
{
MH = V;
flag_MHL = 0;
}
else if(timer_ML>2000)
{
ML = V;
flag_MHL = 0;
}
}
unsigned char lednum;
void ledPro(void)
{
if(uwTick - uwtick_Led<100) return;
uwtick_Led = uwTick;
if(page == 1)
{
lednum|=0x1;
}
else
{
lednum&=0xfe;
}
if(lock_b4 == 1)
{
lednum|=0x04;
}
else
{
lednum&=0xfb;
}
Led_Disp(lednum);
}
unsigned char led2flag; //闪烁标志
void timer_100(void)
{
if(uwTick - uwtick_timer_100<100) return;
uwtick_timer_100 = uwTick;
if(timer_b2>0) //闪烁
{
if(led2flag ==0)
{
led2flag = 1;
lednum |=0x2;
}
else if(led2flag == 1)
{
led2flag = 0;
lednum &=0xfd;
}
}
else
{
lednum &=0xfd;
}
}
void ADCPro(void)
{
if(uwTick - uwtick_ADC<150) return;
uwtick_ADC = uwTick;
adc_value = getADC2()*3.3/4096;
//ad转换成占空比
if(lock_b4 ==0)
{
if(adc_value<1.0)
{
PWM1_Duty = 10;
}
else if(adc_value>3.0)
{
PWM1_Duty = 85;
}
else
{
PWM1_Duty = 10+ (adc_value-1)*75/2;
}
}
V = (1000000/CAP1_UP_Count)*2*3.14*R/100/K;
//需要判断V值是否保持
if(V==V_old&&PWM_Mode==0&&V>ML) //低频下
{
flag_MHL = 1;
}
else if(V==V_old&&PWM_Mode==1&&V>MH) //高频下
{
flag_MHL = 2;
}
else
{
flag_MHL = 0;
}
V_old = V;
//频率
__HAL_TIM_SET_AUTORELOAD(&htim2,PWM1_F); //4k
//占空比
__HAL_TIM_SET_COMPARE(&htim2,TIM_CHANNEL_2,PWM1_F*PWM1_Duty/100);
}
//中断回调函数
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
{
if(htim->Channel == HAL_TIM_ACTIVE_CHANNEL_2)
{
CAP1_UP_Count = HAL_TIM_ReadCapturedValue(htim,TIM_CHANNEL_2)+1;
CAP1_Duty = (float)CAP1_DOWM_Count/CAP1_UP_Count;
}
else if(htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1)
{
CAP1_DOWM_Count = HAL_TIM_ReadCapturedValue(htim,TIM_CHANNEL_1)+1;
}
}
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
/** Configure the main internal regulator output voltage
*/
HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);
/** 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_DIV3;
RCC_OscInitStruct.PLL.PLLN = 20;
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_2) != HAL_OK)
{
Error_Handler();
}
/** Initializes the peripherals clocks
*/
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_ADC12;
PeriphClkInit.Adc12ClockSelection = RCC_ADC12CLKSOURCE_SYSCLK;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
{
Error_Handler();
}
}
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 */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
5 效果显示
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