STM32F407读取INA260上的电压电流值
时间: 2023-09-29 07:02:42 浏览: 59
INA260是一款高精度电流电压计,可以实时监测负载电流和电压,同时还具备过流、过载保护等功能。下面介绍如何使用STM32F407读取INA260上的电压电流值。
首先,需要连接INA260与STM32F407,连接方式如下:
- INA260的VIN+连接电源正极,VIN-连接负极,GND连接STM32F407的地线;
- INA260的SCL和SDA分别连接STM32F407的I2C1的SCL和SDA引脚。
然后,在STM32F407上编写程序,使用I2C1读取INA260的寄存器值,计算出电压和电流值。以下是示例代码:
```c
#include "stm32f4xx.h"
#include "stm32f4xx_i2c.h"
#include "stm32f4xx_gpio.h"
#define INA260_ADDRESS 0x40 // INA260的I2C地址
// INA260寄存器地址
#define REG_CONFIG 0x00
#define REG_CURRENT 0x01
#define REG_BUSVOLTAGE 0x02
#define REG_POWER 0x03
#define REG_MASK_ENABLE 0x06
#define REG_ALERT_LIMIT 0x07
#define REG_MANUFACTURER_ID 0xFE
#define REG_DEVICE_ID 0xFF
// 初始化I2C1
void I2C1_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
I2C_InitTypeDef I2C_InitStruct;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
// 配置I2C1的GPIOB
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_OType = GPIO_OType_OD;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOB, &GPIO_InitStruct);
// 将GPIOB8和GPIOB9连接到I2C1上
GPIO_PinAFConfig(GPIOB, GPIO_PinSource8, GPIO_AF_I2C1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource9, GPIO_AF_I2C1);
// 配置I2C1
I2C_InitStruct.I2C_ClockSpeed = 100000;
I2C_InitStruct.I2C_Mode = I2C_Mode_I2C;
I2C_InitStruct.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStruct.I2C_OwnAddress1 = 0x00;
I2C_InitStruct.I2C_Ack = I2C_Ack_Enable;
I2C_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_Init(I2C1, &I2C_InitStruct);
// 使能I2C1
I2C_Cmd(I2C1, ENABLE);
}
// 读取INA260的寄存器值
uint16_t INA260_Read_Register(uint8_t reg)
{
uint16_t value = 0;
uint8_t tx_buf[1] = {reg}; // 要读取的寄存器地址
uint8_t rx_buf[2] = {0};
// 发送要读取的寄存器地址
I2C_GenerateSTART(I2C1, ENABLE);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
I2C_Send7bitAddress(I2C1, INA260_ADDRESS, I2C_Direction_Transmitter);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
I2C_SendData(I2C1, reg);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
// 读取寄存器值
I2C_GenerateSTART(I2C1, ENABLE);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
I2C_Send7bitAddress(I2C1, INA260_ADDRESS, I2C_Direction_Receiver);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
I2C_AcknowledgeConfig(I2C1, ENABLE);
rx_buf[0] = I2C_ReceiveData(I2C1);
I2C_AcknowledgeConfig(I2C1, DISABLE);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
rx_buf[1] = I2C_ReceiveData(I2C1);
I2C_GenerateSTOP(I2C1, ENABLE);
// 计算寄存器值
value = ((uint16_t)rx_buf[0] << 8) | rx_buf[1];
return value;
}
// 计算电压值
float INA260_Read_Voltage(void)
{
float voltage = 0.0;
uint16_t value = 0;
// 读取BUS VOLTAGE寄存器值
value = INA260_Read_Register(REG_BUSVOLTAGE);
// 计算电压值
voltage = ((float)value * 1.25) / 1000.0;
return voltage;
}
// 计算电流值
float INA260_Read_Current(void)
{
float current = 0.0;
uint16_t value = 0;
// 读取CURRENT寄存器值
value = INA260_Read_Register(REG_CURRENT);
// 计算电流值
current = ((float)value * 1.25) / 1000.0;
return current;
}
int main(void)
{
float voltage = 0.0;
float current = 0.0;
I2C1_Init();
while (1)
{
voltage = INA260_Read_Voltage();
current = INA260_Read_Current();
// 输出电压和电流值
printf("Voltage: %.2fV, Current: %.2fA\n", voltage, current);
}
return 0;
}
```
在上面的代码中,`I2C1_Init()`函数用于初始化I2C1,`INA260_Read_Register()`函数用于读取INA260的寄存器值,`INA260_Read_Voltage()`函数和`INA260_Read_Current()`函数分别用于计算电压和电流值。
需要注意的是,上面的代码仅供参考,具体实现还需要根据自己的实际情况进行调整。另外,为了能够输出电压和电流值,需要在代码中添加相应的输出函数。
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