Diff: I2C_write.cpp

Revision:

3:3e8c16b6620c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/I2C_write.cpp	Thu Jun 21 22:11:25 2018 +0000
@@ -0,0 +1,66 @@
+#include "mbed.h"
+
+extern Serial pc;
+extern int frequ; //unit kHz
+extern char dev_addr; //fixed
+
+char get_half_byte(int *); //defined in I2C_read.cpp
+
+void i2c_write() {
+    char reg_ptr = 0x55;
+    char reg_data = 0xaa;
+    char temp;
+    int flag1 = 0;
+    I2C i2c(p9,p10);
+    LPC_PINCON->PINMODE_OD0 = (LPC_PINCON->PINMODE_OD0  | 0x0003); // To make p9 & P10 open_drain
+    //Read Register Pointer
+    pc.printf("\n\n\n \r\tYahoooo! Lets program a Register");
+    while (!flag1) {
+        pc.printf("\n\n\n \r\tEnter Register Address in hex (0 to f): ");
+        reg_ptr = get_half_byte(&flag1);
+        if (flag1==0) pc.printf(" \033[%dm Invalid Chracter!! No worries, let us try again \033[%dm",41,40);
+    } 
+    //Read Register Data
+    flag1 = 0;
+    while (!flag1) {
+        pc.printf("\n\n \r\tEnter Data in hex (00 to ff): ");
+        reg_data = get_half_byte(&flag1); 
+        if (flag1 == 1) {
+            reg_data = reg_data << 4;
+            temp = get_half_byte(&flag1);
+            reg_data = (reg_data | temp);
+        }
+        if (flag1==0) pc.printf(" \033[%dm Invalid Chracter!! No worries, let us try again \033[%dm",41,40);
+    }                  
+
+    pc.printf("\n\n\n\r\t\033[%dm", 44);//change backround to blue
+    pc.printf(" Device Address (fixed) = 0x%2.2X ; Register Pointer = 0x%2.2X ; Register Data = 0x%2.2X ",dev_addr, reg_ptr, reg_data);
+    pc.printf("\033[%dm", 40);//change backround to black    
+    
+    pc.printf("\n\n\n \r\tContinue Write? (y/n) : ");  
+    temp = 0;
+    while ( temp!='y' && temp!='n') {
+        temp = pc.getc();
+    }
+    if (temp == 'n') {
+        pc.printf("\n\n \r\tAborting Register Write :(");
+        return;
+    }
+    i2c.frequency(frequ*1000);
+    i2c.stop(); //add a stop after hot-read
+    wait_us(10);
+    i2c.start();
+    flag1 = i2c.write(dev_addr);
+    if (flag1 != 1) pc.printf("\n\n\n \r\tNo Ack for dev addr :(");
+    flag1 = i2c.write(reg_ptr);
+    if (flag1 != 1) pc.printf("\n\n \r\tNo Ack reg pointer :(");    
+    flag1 = i2c.write(reg_data); 
+    if (flag1 != 1) pc.printf("\n\n \r\tNo Ack data :(");           
+    wait_us(5);
+    i2c.stop();
+    pc.printf("\n\n\n \r\tYeahhh! Register Write Complete");
+    if (flag1 != 1) pc.printf("\n\n\n\r\t\033[%dm But the Write operation might not be successful since no 'Ack' was received :(  \033[%dm",45,40);
+    pc.printf("\n\n\n\r");             
+    wait_us(5);
+    i2c.~I2C();   
+}  
\ No newline at end of file