电脑网站页面怎么调大小,学校网站建设 效果,阿里云上可以做网站吗,天津优化网站实验目的:了解ADC基本概念
电路图#xff1a; ADC#xff08;Analog-Digital Converter#xff09;模拟-数字转换器#xff0c;它可以将引脚上连续变化的模拟电压转换为内存中存储的数字变量#xff0c;建立模拟电路到数字电路的桥梁。
实验效果#xff1a; #xff0…实验目的:了解ADC基本概念
电路图 ADCAnalog-Digital Converter模拟-数字转换器它可以将引脚上连续变化的模拟电压转换为内存中存储的数字变量建立模拟电路到数字电路的桥梁。
实验效果 一单次非扫描实验步骤
1. 选择通道
2. 选择为独立模式;
3. 设置数据为右对齐、非扫描模式、非连续模式。
4. 转换通道数为1因为前面只勾选上了IN0 2、时钟配置
ADC时钟来自RCC内部72M时钟但是ADC时钟最大频率只能是14MHZ而ADC的预分频器只能 选择2/4/6/8。综上所述ADC的预分频器最大只能选择6分频频率12MHZ oled 配置为方便把前面相关博文复制一份在这
用HAL库改写江科大的stm32入门例子4-1 OLED_江科大oled移植hal库-CSDN博客 GPIO引脚映射pb8、pb9 i2c1设置 引入oled驱动 驱动文件在共享网盘中有需要自行下载 由于我们自己重新映射了iic 引脚要在oled.中修改引脚 main函数中引入oled.h 测试代码 /*模块初始化*/OLED_Init(); //OLED初始化/*OLED显示*/OLED_ShowChar(1, 1, A); //1行1列显示字符A 原文链接https://blog.csdn.net/wh_xia_jun/article/details/138889005 3、main函数中校正ADC固定写法
HAL_ADCEx_Calibration_Start(hadc1);
4、编写转换并获取ADC函数
uint16_t StartAndGetOneResult(){HAL_ADC_Start(hadc1); //启动ADC转换HalState HAL_ADC_PollForConversion(hadc1, 10);//等待转换完成if(HalState HAL_OK){RetHAL_ADC_GetValue(hadc1); //获取ADC转换结果} else{Ret0;}//HAL_ADC_Stop(hadc1);return Ret;
}
5、while中获取显示 while (1){ADValue StartAndGetOneResult(); //启动ADC转换并获取结果OLED_ShowNum(1,9,ADValue,4); //显示AD转换值Voltage(float) ADValue/ 4095 *3.3; //计算电压值OLED_ShowNum(2,9,(uint32_t)Voltage,1); //显示电压值整数部分OLED_ShowNum(2,11,((uint16_t)(Voltage * 100)) % 100,2); //显示电压值小数部分HAL_Delay(100);/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}
main文件中完整代码
/* USER CODE BEGIN Header */
/********************************************************************************* file : main.c* brief : Main program body******************************************************************************* attention** 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 i2c.h
#include gpio.h/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include oled.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 */
HAL_StatusTypeDef HalState; //HAL库函数返回状态
uint16_t Ret; //返回值
uint16_t ADValue; //AD转换值
float Voltage; //电压值
/* 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 */
//启动ADC转换并获取结果
uint16_t StartAndGetOneResult(){HAL_ADC_Start(hadc1); //启动ADC转换HalState HAL_ADC_PollForConversion(hadc1, 10);//等待转换完成if(HalState HAL_OK){RetHAL_ADC_GetValue(hadc1); //获取ADC转换结果} else{Ret0;}//HAL_ADC_Stop(hadc1);return Ret;
}/* 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_ADC1_Init();MX_I2C1_Init();/* USER CODE BEGIN 2 *//*模块初始化*/OLED_Init(); //OLED初始化/*OLED显示*/OLED_ShowString(1,1,ADValue:);OLED_ShowString(2,1,Voltage:0.00V);HAL_ADCEx_Calibration_Start(hadc1);/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){ADValue StartAndGetOneResult(); //启动ADC转换并获取结果OLED_ShowNum(1,9,ADValue,4); //显示AD转换值Voltage(float) ADValue/ 4095 *3.3; //计算电压值OLED_ShowNum(2,9,(uint32_t)Voltage,1); //显示电压值整数部分OLED_ShowNum(2,11,((uint16_t)(Voltage * 100)) % 100,2); //显示电压值小数部分HAL_Delay(100);/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}/* USER CODE END 3 */
}/*** brief System Clock Configuration* retval None*/
void SystemClock_Config(void)
{RCC_OscInitTypeDef RCC_OscInitStruct {0};RCC_ClkInitTypeDef RCC_ClkInitStruct {0};RCC_PeriphCLKInitTypeDef PeriphClkInit {0};/** 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.HSEPredivValue RCC_HSE_PREDIV_DIV1;RCC_OscInitStruct.HSIState RCC_HSI_ON;RCC_OscInitStruct.PLL.PLLState RCC_PLL_ON;RCC_OscInitStruct.PLL.PLLSource RCC_PLLSOURCE_HSE;RCC_OscInitStruct.PLL.PLLMUL RCC_PLL_MUL9;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_DIV2;RCC_ClkInitStruct.APB2CLKDivider RCC_HCLK_DIV1;if (HAL_RCC_ClockConfig(RCC_ClkInitStruct, FLASH_LATENCY_2) ! HAL_OK){Error_Handler();}PeriphClkInit.PeriphClockSelection RCC_PERIPHCLK_ADC;PeriphClkInit.AdcClockSelection RCC_ADCPCLK2_DIV6;if (HAL_RCCEx_PeriphCLKConfig(PeriphClkInit) ! HAL_OK){Error_Handler();}
}/* USER CODE BEGIN 4 *//* 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 */二连续非扫描实验步骤
1、与单次非扫描区别
连续模式打开 且 在代码中只需要执行一次开始转换即可也不需要等待转换完成 完成代码如下
/* USER CODE BEGIN Header */
/********************************************************************************* file : main.c* brief : Main program body******************************************************************************* attention** 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 i2c.h
#include gpio.h/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include oled.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 */
HAL_StatusTypeDef HalState; //HAL库函数返回状态
uint16_t Ret; //返回值
uint16_t ADValue; //AD转换值
float Voltage; //电压值
/* 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 */
//启动ADC转换并获取结果
// uint16_t StartAndGetOneResult(){
// HAL_ADC_Start(hadc1); //启动ADC转换
// HalState HAL_ADC_PollForConversion(hadc1, 10);//等待转换完成
// if(HalState HAL_OK){
// RetHAL_ADC_GetValue(hadc1); //获取ADC转换结果
// } else{
// Ret0;
// }
// //HAL_ADC_Stop(hadc1);
// return Ret;
// }uint16_t StartAndGetOneResult(){RetHAL_ADC_GetValue(hadc1);return Ret;
}/* 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_ADC1_Init();MX_I2C1_Init();/* USER CODE BEGIN 2 *//*模块初始化*/OLED_Init(); //OLED初始化/*OLED显示*/OLED_ShowString(1,1,ADValue:);OLED_ShowString(2,1,Voltage:0.00V);HAL_ADCEx_Calibration_Start(hadc1);HAL_ADC_Start(hadc1);//只执行一次开始转换/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){ADValue StartAndGetOneResult(); //获取结果OLED_ShowNum(1,9,ADValue,4); //显示AD转换值Voltage(float) ADValue/ 4095 *3.3; //计算电压值OLED_ShowNum(2,9,(uint32_t)Voltage,1); //显示电压值整数部分OLED_ShowNum(2,11,((uint16_t)(Voltage * 100)) % 100,2); //显示电压值小数部分HAL_Delay(100);/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}/* USER CODE END 3 */
}/*** brief System Clock Configuration* retval None*/
void SystemClock_Config(void)
{RCC_OscInitTypeDef RCC_OscInitStruct {0};RCC_ClkInitTypeDef RCC_ClkInitStruct {0};RCC_PeriphCLKInitTypeDef PeriphClkInit {0};/** 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.HSEPredivValue RCC_HSE_PREDIV_DIV1;RCC_OscInitStruct.HSIState RCC_HSI_ON;RCC_OscInitStruct.PLL.PLLState RCC_PLL_ON;RCC_OscInitStruct.PLL.PLLSource RCC_PLLSOURCE_HSE;RCC_OscInitStruct.PLL.PLLMUL RCC_PLL_MUL9;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_DIV2;RCC_ClkInitStruct.APB2CLKDivider RCC_HCLK_DIV1;if (HAL_RCC_ClockConfig(RCC_ClkInitStruct, FLASH_LATENCY_2) ! HAL_OK){Error_Handler();}PeriphClkInit.PeriphClockSelection RCC_PERIPHCLK_ADC;PeriphClkInit.AdcClockSelection RCC_ADCPCLK2_DIV6;if (HAL_RCCEx_PeriphCLKConfig(PeriphClkInit) ! HAL_OK){Error_Handler();}
}/* USER CODE BEGIN 4 *//* 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 */在无论是连续模式还是非连续模式下一旦执行了HAL_ADC_Start(hadc1);函数ADC开始转换。
在非连续模式下您需要使用HAL_ADC_PollForConversion(hadc1, HAL_MAX_DELAY);函数来等待转换完成然后使用HAL_ADC_GetValue函数来读取ADC值。此函数会阻塞直到转换完成或者超时。
在连续模式下由于转换持续进行您可以直接使用HAL_ADC_GetValue函数来读取最新的ADC值无需等待转换完成。 说明
一、简介
它是一个12位逐次逼近形的ADC转换一次耗时为1微妙(即转换频率为1MHZ),输入的电压范围是0~3.3V对应的转换结果是0~4095(2^12)我理解就是一个电子的电压与数值的字典表而已把电压值映射为4059个数字。
二、逐次逼近形ADC原理 这里借助一个专门用于8通道的ADC转换芯片ADC0809的电路来举例STM32中的ADC转换跟ADC0809在原理上是一样的。
1. ADDA/ADDB/ADDC/ALE是用来控制通道0~通道7中的一个通道接入芯片内部的。相当于是一个选择器。
2. Vref/Vref-是数模转换器的电压参考值是由一个模拟量来输出一个控制量。模拟量存在SAR中数字量是模拟量通过DAC转换出来的电压它的范围在Vref/Vref-之间DAC输出的这个数值量会输送到比较器,比较器会比较数字量与输入电压大小如果DAC输出的数字量电压小于输入
电压那么模拟量SAR会自动调大输出一个新的DAC转换出来的数字量不断循环比较。
3. 当逼近完成后(12位的ADC利用二分法对比12次后)即DAC输出电压跟输入电压相当时会给出一个EOC信号。这个结果通过三态锁存缓冲器输出。
三、STM32ADC框图 ps30. ADC—电压采集 — [野火]STM32 HAL库开发实战指南——基于野火霸天虎开发板 文档
1、输入并转换
16个可选通道(F103C8T6只有10个通道)、1个芯片自带用于测量芯片温度的传感器、1个测试参考电压 2、输出
AD转换可分为两种模式
注入通道最多只能选4个通道且转换出来的结果会分别存放到4个寄存器中
规则通道最多可选16个通道但是只有一个寄存器用于存放结果假如不想被覆盖可以利用DMA请求把转换出来的结果依次转运出来。
本实验用规则通道。
输出的结果是12位的而寄存器是16位的所以结果存放在寄存器中就有两种模式
左对齐左对齐的数据相当于真实值左移了4次即放大了16倍右对齐获得的数据就是真实值
右对齐获得的数据就是真实值 3、触发转换方式
软件触发硬件触发
4、时钟
ADC时钟来自RCC内部72M时钟但是ADC时钟最大频率只能是14MHZ而ADC的预分频器只能选择 2/4/6/8。综上所述ADC的预分频器最大只能选择6分频频率12MHZ.
5、四种模式
分两个维度 单次/连续转换后是否继续自动转换单次就不继续自动转换 扫描/非扫描是否支持多通道扫描就可以多通道组合起来四种模式
