add battery monitor skeleton c code

Makefile

@@ -1,7 +1,7 @@
 SOURCE = main.c
-CC     = arm-linux-gnueabi-gcc
+CC     = aarch64-linux-gnu-gcc
 FLAG   = --static -o
-OUT    = I2C_scan.elf
+OUT    = I2C_scan
 main:${SOURCE}
 	${CC} ${SOURCE} ${FLAG} ${OUT}
 clean:

i2c_driver/Makefile

@@ -0,0 +1,12 @@
+SOURCE = main.c
+CC     = aarch64-linux-gnu-gcc
+FLAG   = --static -o
+OUT    = I2C_out
+main:${SOURCE}
+	${CC} ${SOURCE} ${FLAG} ${OUT}
+clean:
+	rm -r ${OUT}
+.PHONY:clean
+	
+	
+

i2c_driver/main.c

@@ -0,0 +1,76 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <linux/i2c-dev.h>
+
+#define I2C_BUS "/dev/i2c-1"  // I2C bus device
+#define I2C_ADDRESS 0x50      // Example I2C device address (7-bit address)
+
+// Function to write a byte to the I2C device
+int i2c_write(int file, uint8_t reg, uint8_t value) {
+    uint8_t buffer[2];
+    buffer[0] = reg;          // Register address
+    buffer[1] = value;        // Data to write
+
+    if (write(file, buffer, 2) != 2) {
+        perror("Failed to write to the I2C bus");
+        return -1;
+    }
+
+    return 0;
+}
+
+// Function to read a byte from the I2C device
+int i2c_read(int file, uint8_t reg, uint8_t *data) {
+    if (write(file, &reg, 1) != 1) {  // Send the register address
+        perror("Failed to write register address to the I2C bus");
+        return -1;
+    }
+
+    if (read(file, data, 1) != 1) {   // Read the data
+        perror("Failed to read from the I2C bus");
+        return -1;
+    }
+
+    return 0;
+}
+
+int main() {
+    int file;
+    uint8_t data;
+
+    // Open the I2C bus
+    if ((file = open(I2C_BUS, O_RDWR)) < 0) {
+        perror("Failed to open the I2C bus");
+        exit(1);
+    }
+
+    // Connect to the I2C device
+    if (ioctl(file, I2C_SLAVE, I2C_ADDRESS) < 0) {
+        perror("Failed to connect to the I2C device");
+        close(file);
+        exit(1);
+    }
+
+    // Write a value to the device
+    if (i2c_write(file, 0x00, 0x42) < 0) {
+        close(file);
+        exit(1);
+    }
+
+    // Read a value from the device
+    if (i2c_read(file, 0x00, &data) < 0) {
+        close(file);
+        exit(1);
+    }
+
+    printf("Read value: 0x%02X\n", data);
+
+    // Close the I2C bus
+    close(file);
+    return 0;
+}
+