Mateusz Grzywacz / Mbed OS I2C_scanner

An ultimate I2C scanner. To be ultimate it should check speeds tbh. Arduino port really

main.cpp@0:eac9f05ba8e0, 2018-07-07 (annotated)

Committer:
amateusz
Date:
Sat Jul 07 13:18:17 2018 +0000
Revision:
0:eac9f05ba8e0
Ultimate I2C scanner. An Arduino port

Who changed what in which revision?

UserRevisionLine numberNew contents of line
amateusz 0:eac9f05ba8e0 1 #include "mbed.h"
amateusz 0:eac9f05ba8e0 2
amateusz 0:eac9f05ba8e0 3 Serial pc(USBTX, USBRX, 115200);
amateusz 0:eac9f05ba8e0 4
amateusz 0:eac9f05ba8e0 5
amateusz 0:eac9f05ba8e0 6 I2C i2c(PC_1, PC_0); // SDA, SCL L476 all on the left side
amateusz 0:eac9f05ba8e0 7 //I2C i2c(PB_9, PB_8); // SDA, SCL arduino pins
amateusz 0:eac9f05ba8e0 8 //I2C i2c(PB_14, PB_13); // SDA, SCL
amateusz 0:eac9f05ba8e0 9 DigitalOut led(D13);
amateusz 0:eac9f05ba8e0 10
amateusz 0:eac9f05ba8e0 11 int main()
amateusz 0:eac9f05ba8e0 12 {
amateusz 0:eac9f05ba8e0 13 i2c.frequency(100000);
amateusz 0:eac9f05ba8e0 14 while (1) {
amateusz 0:eac9f05ba8e0 15 pc.printf("Searching for I2C devices...\n\r");
amateusz 0:eac9f05ba8e0 16
amateusz 0:eac9f05ba8e0 17 int count = 0;
amateusz 0:eac9f05ba8e0 18 for (int address = 0; address < 255; address +=2) { // check only for device's read addres
amateusz 0:eac9f05ba8e0 19 if (!i2c.write(address, NULL, 0)) { // 0 returned is ok
amateusz 0:eac9f05ba8e0 20 pc.printf("I2C device found at address 0x%02X (0x%02X in 8-bit)\n\r", address >> 1, address); // the address is without LSB, which is R/W flag. shoft it right once
amateusz 0:eac9f05ba8e0 21 count++;
amateusz 0:eac9f05ba8e0 22 led = 1;
amateusz 0:eac9f05ba8e0 23 }
amateusz 0:eac9f05ba8e0 24 wait(0.02);
amateusz 0:eac9f05ba8e0 25 }
amateusz 0:eac9f05ba8e0 26 if (count)
amateusz 0:eac9f05ba8e0 27 pc.printf("%d", count);
amateusz 0:eac9f05ba8e0 28 else
amateusz 0:eac9f05ba8e0 29 pc.printf("No");
amateusz 0:eac9f05ba8e0 30 pc.printf(" device%c found\n\r\n", count == 1?'\0':'s');
amateusz 0:eac9f05ba8e0 31 led = 0;
amateusz 0:eac9f05ba8e0 32 wait (1.8);
amateusz 0:eac9f05ba8e0 33 }
amateusz 0:eac9f05ba8e0 34 }