Diff: main.cpp

Revision:

0:2db41a0c2f17

Child:

1:dbe78e80d722

diff -r 000000000000 -r 2db41a0c2f17 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Jan 13 15:48:33 2015 +0000
@@ -0,0 +1,60 @@
+#include "mbed.h"
+#include "TextLCD.h"
+ 
+#define Device_Name_ADDR   (0xEE) // Device You Wish to Use Address - using i2c Address
+#define WRITE              (0x00) // i2c Write bit
+#define READ               (0x01) // i2c Read bit
+
+/* This is a program to demonstrate the ease of use of the i2c bus
+   and Detecting any Devices connected and returning their addresses
+   Do not forget that Pull Up resistors are required on the SDA and SCL lines
+   (Typically 2K ohms for 400KHz bus speeds) NB these could be provided on the PCB Modules.
+   These are required since devices connected with the i2c will have 'open drain' (or open collector)
+   circuitry to allow wire 'ORing' of their respective connections. Used with a stm32-Nucleo-F401RE.
+   Used both Serial Port to USB and LCD Module to display results can use either or both just comment out if you wish.
+   Martin Simpson January 2015 */
+
+I2C i2c(I2C_SDA, I2C_SCL);       //I2C Class Pin Assignments see I2C.h
+ 
+Serial pc(SERIAL_TX, SERIAL_RX); //Serial Class Pin Assignments see Serial.h
+
+TextLCD lcd(D2,D3,D4,D5,D6,D7);  //Text LCD Class assignments RS, E, D4 to D7 see TextLCD.h
+
+char ucdata_write[2];
+short count=0;
+
+int main()
+{
+    unsigned int uibaudrate=115200;
+    pc.baud(uibaudrate);
+    
+    unsigned int uifrequency=400000; //400KHz for i2c Max
+    i2c.frequency (uifrequency);
+    
+    pc.printf("\n\rHello World ");
+    pc.printf("at %u BAUD and %uKHz i2c Frequency\n\r",uibaudrate,uifrequency/1000);
+    pc.printf("Using mbed.org Martin\n\r");
+    
+    lcd.cls();lcd.locate(0,0); //Tidy up LCD Display
+
+    ucdata_write[0]=0;ucdata_write[1]=0;
+
+    for (int Device_Adress=0;Device_Adress<=0xFE;Device_Adress+=2)//Stepping in 2 Because Read/Write use LSB
+    {
+    if (!i2c.write((Device_Adress|WRITE), ucdata_write, 1, 0))// Check for ACK from i2c Device NB I am 'ORing' the Write Bit
+        {
+            pc.printf("ACK from the Device at Address %#4x\n\r",Device_Adress);
+            lcd.printf("ACK at:%#4x\n",Device_Adress);
+            count=count+1;
+            wait(2);
+        }
+        else
+        {
+            //Left the following in for development/Future coding
+            //pc.printf("\n\rCannot get an ACK from the Device check connections!\n\r");
+            //lcd.printf("No ACK from\nDevice!");
+        }
+    }
+    pc.printf("\n\r %d Devices have been detected!\n\r",count);
+    lcd.printf("%d Dev Found!",count);
+}