Martin Simpson / Mbed 2 deprecated ic2_test_bus

Simple Test Program to check ACK from i2c Devices connected to an MBED board and then to report their addresses

Dependencies:   mbed TextLCD

main.cpp@1:df2444f34fec, 2021-02-15 (annotated)

Committer:
martinsimpson
Date:
Mon Feb 15 17:20:16 2021 +0000
Revision:
1:df2444f34fec
Parent:
0:2db41a0c2f17 
Removed lcd and Serial class references

Who changed what in which revision?

UserRevisionLine numberNew contents of line
martinsimpson 0:2db41a0c2f17 1 #include "mbed.h"
martinsimpson 0:2db41a0c2f17 2
martinsimpson 0:2db41a0c2f17 3 #define Device_Name_ADDR (0xEE) // Device You Wish to Use Address - using i2c Address
martinsimpson 0:2db41a0c2f17 4 #define WRITE (0x00) // i2c Write bit
martinsimpson 0:2db41a0c2f17 5 #define READ (0x01) // i2c Read bit
martinsimpson 0:2db41a0c2f17 6
martinsimpson 0:2db41a0c2f17 7 /* This is a program to demonstrate the ease of use of the i2c bus
martinsimpson 0:2db41a0c2f17 8 and Detecting any Devices connected and returning their addresses
martinsimpson 0:2db41a0c2f17 9 Do not forget that Pull Up resistors are required on the SDA and SCL lines
martinsimpson 0:2db41a0c2f17 10 (Typically 2K ohms for 400KHz bus speeds) NB these could be provided on the PCB Modules.
martinsimpson 0:2db41a0c2f17 11 These are required since devices connected with the i2c will have 'open drain' (or open collector)
martinsimpson 0:2db41a0c2f17 12 circuitry to allow wire 'ORing' of their respective connections. Used with a stm32-Nucleo-F401RE.
martinsimpson 0:2db41a0c2f17 13 Used both Serial Port to USB and LCD Module to display results can use either or both just comment out if you wish.
martinsimpson 0:2db41a0c2f17 14 Martin Simpson January 2015 */
martinsimpson 0:2db41a0c2f17 15
martinsimpson 0:2db41a0c2f17 16 I2C i2c(I2C_SDA, I2C_SCL); //I2C Class Pin Assignments see I2C.h
martinsimpson 0:2db41a0c2f17 17
martinsimpson 0:2db41a0c2f17 18 int main()
martinsimpson 0:2db41a0c2f17 19 {
martinsimpson 1:df2444f34fec 20
martinsimpson 1:df2444f34fec 21 char ucdata_write[2];
martinsimpson 1:df2444f34fec 22 short count=0;
martinsimpson 0:2db41a0c2f17 23
martinsimpson 0:2db41a0c2f17 24 unsigned int uifrequency=400000; //400KHz for i2c Max
martinsimpson 0:2db41a0c2f17 25 i2c.frequency (uifrequency);
martinsimpson 0:2db41a0c2f17 26
martinsimpson 1:df2444f34fec 27 printf("\n\rHello World ");
martinsimpson 1:df2444f34fec 28 printf("at %uKHz i2c Frequency\n\r",uifrequency/1000);
martinsimpson 1:df2444f34fec 29 printf("Using mbed.org Martin\n\r");
martinsimpson 0:2db41a0c2f17 30
martinsimpson 0:2db41a0c2f17 31 ucdata_write[0]=0;ucdata_write[1]=0;
martinsimpson 0:2db41a0c2f17 32
martinsimpson 0:2db41a0c2f17 33 for (int Device_Adress=0;Device_Adress<=0xFE;Device_Adress+=2)//Stepping in 2 Because Read/Write use LSB
martinsimpson 0:2db41a0c2f17 34 {
martinsimpson 0:2db41a0c2f17 35 if (!i2c.write((Device_Adress|WRITE), ucdata_write, 1, 0))// Check for ACK from i2c Device NB I am 'ORing' the Write Bit
martinsimpson 0:2db41a0c2f17 36 {
martinsimpson 1:df2444f34fec 37 printf("ACK from the Device at Address %#4x\n\r",Device_Adress);
martinsimpson 1:df2444f34fec 38 count++;
martinsimpson 0:2db41a0c2f17 39 wait(2);
martinsimpson 0:2db41a0c2f17 40 }
martinsimpson 0:2db41a0c2f17 41 else
martinsimpson 0:2db41a0c2f17 42 {
martinsimpson 0:2db41a0c2f17 43 //Left the following in for development/Future coding
martinsimpson 0:2db41a0c2f17 44 //pc.printf("\n\rCannot get an ACK from the Device check connections!\n\r");
martinsimpson 0:2db41a0c2f17 45 //lcd.printf("No ACK from\nDevice!");
martinsimpson 0:2db41a0c2f17 46 }
martinsimpson 0:2db41a0c2f17 47 }
martinsimpson 1:df2444f34fec 48 printf("\n\r %d Devices have been detected!\n\r",count);
martinsimpson 0:2db41a0c2f17 49 }