基于海思35X使用ADC电池电量检测并转换结果计算出电池电量 完整代码
时间: 2024-04-29 09:21:51 浏览: 14
以下是基于海思35X使用ADC电池电量检测并转换结果计算出电池电量的完整代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <asm/ioctl.h>
#include <linux/i2c-dev.h>
#define I2C_FILE_NAME "/dev/i2c-0"
#define I2C_SLAVE_ADDR 0x48
#define ADC_CHANNEL 0
int main(void)
{
int i2c_fd;
char buf[3];
double voltage, percentage;
// Open I2C device file
i2c_fd = open(I2C_FILE_NAME, O_RDWR);
if (i2c_fd < 0) {
perror("Failed to open I2C device file");
exit(EXIT_FAILURE);
}
// Set I2C slave address
if (ioctl(i2c_fd, I2C_SLAVE, I2C_SLAVE_ADDR) < 0) {
perror("Failed to set I2C slave address");
exit(EXIT_FAILURE);
}
// Select ADC channel
buf[0] = 0x40 | ADC_CHANNEL;
if (write(i2c_fd, buf, 1) != 1) {
perror("Failed to select ADC channel");
exit(EXIT_FAILURE);
}
// Read ADC value
if (read(i2c_fd, buf, 2) != 2) {
perror("Failed to read ADC value");
exit(EXIT_FAILURE);
}
// Convert ADC value to voltage
voltage = (buf[0] * 256.0 + buf[1]) / 32768.0 * 6.144;
// Calculate battery percentage
percentage = (voltage - 3.0) / (4.2 - 3.0) * 100.0;
if (percentage < 0.0) {
percentage = 0.0;
} else if (percentage > 100.0) {
percentage = 100.0;
}
printf("Battery voltage: %.2f V\n", voltage);
printf("Battery percentage: %.2f %%\n", percentage);
close(i2c_fd);
return 0;
}
```
代码中使用了Linux下的I2C接口,通过I2C读取ADC芯片的值,并将其转换为电池电压值。然后根据电池的电压值计算出电池的电量百分比,并输出结果。注意,ADC芯片的地址默认为0x48,如果需要修改地址,可以在代码中修改I2C_SLAVE_ADDR变量的值。