Andrea Corrado / Mbed OS I2C-TEST

finds I2C slaves on BUS

main.cpp@0:4241a76032ad, 2017-10-09 (annotated)

Committer:
andcor02
Date:
Mon Oct 09 09:50:19 2017 +0000
Revision:
0:4241a76032ad
test and find I2C slaves on BUS

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andcor02 0:4241a76032ad 1 //Credit to Paul Staron. https://os.mbed.com/questions/6129/I2C-Not-Working/
andcor02 0:4241a76032ad 2
andcor02 0:4241a76032ad 3 #include "mbed.h"
andcor02 0:4241a76032ad 4
andcor02 0:4241a76032ad 5 #define I2C_SDA PF_0
andcor02 0:4241a76032ad 6 #define I2C_SCL PF_1
andcor02 0:4241a76032ad 7
andcor02 0:4241a76032ad 8 Serial pc(USBTX, USBRX);
andcor02 0:4241a76032ad 9
andcor02 0:4241a76032ad 10 I2C i2c(I2C_SDA, I2C_SCL); // I2C device sda, scl
andcor02 0:4241a76032ad 11
andcor02 0:4241a76032ad 12
andcor02 0:4241a76032ad 13 int main() {
andcor02 0:4241a76032ad 14 i2c.frequency(10000); // set required i2c frequency
andcor02 0:4241a76032ad 15
andcor02 0:4241a76032ad 16 pc.printf("I2C Searching!\n\n");
andcor02 0:4241a76032ad 17 pc.printf("Starting....\n\n");
andcor02 0:4241a76032ad 18
andcor02 0:4241a76032ad 19 while (1) {
andcor02 0:4241a76032ad 20 int count = 0;
andcor02 0:4241a76032ad 21 for (int address=0; address<256; address+=2) {
andcor02 0:4241a76032ad 22 if (!i2c.write(address, NULL, 0)) { // 0 returned is ok
andcor02 0:4241a76032ad 23 pc.printf("I2C address 0x%02X\n", address);
andcor02 0:4241a76032ad 24 count++;
andcor02 0:4241a76032ad 25 }
andcor02 0:4241a76032ad 26 }
andcor02 0:4241a76032ad 27 pc.printf("%d devices found\n\n\n", count);
andcor02 0:4241a76032ad 28 wait(2);
andcor02 0:4241a76032ad 29 }
andcor02 0:4241a76032ad 30 }