stm32hal库iic通信
时间: 2023-09-09 08:14:08 浏览: 28
STM32HAL库可以通过I2C(也称为IIC)接口进行通信。以下是使用STM32HAL库进行IIC通信的步骤:
1. 初始化I2C总线:使用HAL_I2C_Init函数初始化I2C总线,并设置I2C的时钟速度、I2C地址模式等参数。
2. 发送I2C起始信号:使用HAL_I2C_Master_Transmit函数发送I2C起始信号。
3. 发送I2C地址:使用HAL_I2C_Master_Transmit函数发送I2C设备地址。
4. 发送数据:使用HAL_I2C_Master_Transmit函数发送要传输的数据。
5. 接收数据:使用HAL_I2C_Master_Receive函数接收从设备传回的数据。
6. 发送I2C停止信号:使用HAL_I2C_Stop函数发送I2C停止信号。
以下是一个简单的例子:
```c
#include "stm32f4xx_hal.h"
I2C_HandleTypeDef hi2c1;
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_I2C1_Init(void);
uint8_t i2c_address = 0x50;
uint8_t buffer[2];
int main(void)
{
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_I2C1_Init();
while (1)
{
// Send data to I2C device
buffer[0] = 0x00;
buffer[1] = 0x01;
HAL_I2C_Master_Transmit(&hi2c1, i2c_address, buffer, 2, HAL_MAX_DELAY);
// Receive data from I2C device
HAL_I2C_Master_Receive(&hi2c1, i2c_address, buffer, 2, HAL_MAX_DELAY);
}
}
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
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_HSI;
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_0) != HAL_OK)
{
Error_Handler();
}
}
static void MX_I2C1_Init(void)
{
hi2c1.Instance = I2C1;
hi2c1.Init.ClockSpeed = 100000;
hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;
hi2c1.Init.OwnAddress1 = 0;
hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
hi2c1.Init.OwnAddress2 = 0;
hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
if (HAL_I2C_Init(&hi2c1) != HAL_OK)
{
Error_Handler();
}
}
static void MX_GPIO_Init(void)
{
__HAL_RCC_GPIOB_CLK_ENABLE();
GPIO_InitTypeDef GPIO_InitStruct = {0};
GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_7;
GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF4_I2C1;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
}
void Error_Handler(void)
{
while (1)
{
}
}
```
在此例中,我们初始化了一个I2C总线,并将其连接到GPIOB6和GPIOB7引脚上。我们使用HAL_I2C_Master_Transmit和HAL_I2C_Master_Receive函数来发送和接收数据。请注意,我们在发送数据之前必须发送I2C起始信号,并在接收数据之后发送I2C停止信号。