Diff: main.cpp

Revision:

0:14e4f511a1bd

Child:

1:8ded5dafc62c

diff -r 000000000000 -r 14e4f511a1bd main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sat Jun 20 06:13:44 2020 +0000
@@ -0,0 +1,66 @@
+#include "mbed.h"
+ 
+I2C i2c(p9, p10);
+Serial pc(USBTX, USBRX);
+
+#define ADDR 0xA0
+
+int pointerAdddress = 0;
+char s[10];
+ 
+ 
+// this function has 63 bytes write limit
+void writeEEPROM(char address, unsigned int eeaddress, char *data, int size)
+{
+    char i2cBuffer[size + 2];
+    i2cBuffer[0] = (unsigned char)(eeaddress >> 8); // MSB
+    i2cBuffer[1] = (unsigned char)(eeaddress & 0xFF00); // LSB
+ 
+    for (int i = 0; i < size; i++) {
+        i2cBuffer[i + 2] = data[i];
+    }
+ 
+    int result = i2c.write(ADDR, i2cBuffer, size + 2);
+    wait_ms(6);
+}
+ 
+// this function has no read limit
+void readEEPROM(char address, unsigned int eeaddress, char *data, int size)
+{
+    char i2cBuffer[2];
+    i2cBuffer[0] = (unsigned char)(eeaddress >> 8); // MSB
+    i2cBuffer[1] = (unsigned char)(eeaddress & 0xFF00); // LSB
+ 
+    // Reset eeprom pointer address
+    int result = i2c.write(ADDR, i2cBuffer, 2);
+    wait_ms(6);
+ 
+    // Read eeprom
+    i2c.read(ADDR, data, size);
+    wait_ms(6);
+}
+ 
+int main()
+{
+    int i, length;
+    char data_read[1]; 
+    readEEPROM(ADDR, pointerAdddress, data_read, 1);
+    pc.printf("Previous data stored: %s\n", data_read);
+    
+    while(1)
+    {
+        i = 1
+        s[0] = i;
+        
+        // write tha data
+        writeEEPROM(ADDR, pointerAdddress, s, 1);
+        pc.printf("Data written: %s\n", s);
+    
+        // read the data
+        readEEPROM(ADDR, pointerAdddress, data_read, 1);
+        pc.printf("Data read: %s\n", data_read);
+    
+        wait(1);
+    }
+ 
+}
\ No newline at end of file