Nikola Cvetković / Mbed 2 deprecated 19E042PIM_V3_Z1

I2C_2 bus scanner for STM32L476RG.

Dependencies:   mbed

main.cpp@9:c403dc9b86cc, 2021-11-20 (annotated)

Committer:
tzwell
Date:
Sat Nov 20 13:08:09 2021 +0000
Revision:
9:c403dc9b86cc
Parent:
8:ead6147e31a4 
First commit, first publish-

Who changed what in which revision?

UserRevisionLine numberNew contents of line
tzwell 9:c403dc9b86cc 1 /* I2C scanner for NUCLEO-L476RG
tzwell 9:c403dc9b86cc 2 *
tzwell 9:c403dc9b86cc 3 * November, 2021.
tzwell 9:c403dc9b86cc 4 */
joeata2wh 0:befb557584fb 5 #include "mbed.h"
joeata2wh 0:befb557584fb 6
tzwell 9:c403dc9b86cc 7 #define D_SDA PB_14
tzwell 9:c403dc9b86cc 8 #define D_SCL PB_13
tzwell 9:c403dc9b86cc 9 #define MIN_ADD 0
tzwell 9:c403dc9b86cc 10 #define MAX_ADD 127
tzwell 9:c403dc9b86cc 11 #define DATA "00"
tzwell 9:c403dc9b86cc 12 #define LENGTH 1
tzwell 9:c403dc9b86cc 13 #define SMALL_DELAY_MS 10
tzwell 9:c403dc9b86cc 14 #define BIG_DELAY 2
joeata2wh 0:befb557584fb 15
tzwell 9:c403dc9b86cc 16 I2C i2c(D_SDA, D_SCL);
joeata2wh 0:befb557584fb 17 DigitalOut myled(LED1);
joeata2wh 0:befb557584fb 18
joeata2wh 4:ad1195c10812 19 int ack;
tzwell 9:c403dc9b86cc 20 int address;
tzwell 9:c403dc9b86cc 21
joeata2wh 0:befb557584fb 22 void scanI2C() {
tzwell 9:c403dc9b86cc 23 for(address = MIN_ADD; address < MAX_ADD; address++) {
tzwell 9:c403dc9b86cc 24 ack = i2c.write(address << 1, DATA, LENGTH);
tzwell 9:c403dc9b86cc 25 if (!ack) {
tzwell 9:c403dc9b86cc 26 printf("\tFound at: %3d <--> %3x\r\n", address,address);
joeata2wh 0:befb557584fb 27 }
tzwell 9:c403dc9b86cc 28 wait_ms(SMALL_DELAY_MS);
joeata2wh 0:befb557584fb 29 }
joeata2wh 0:befb557584fb 30 }
joeata2wh 0:befb557584fb 31
joeata2wh 0:befb557584fb 32 int main() {
tzwell 9:c403dc9b86cc 33 printf("I2C scanner \r\n");
joeata2wh 0:befb557584fb 34 scanI2C();
tzwell 9:c403dc9b86cc 35 printf("Finished Scan\r\n");
joeata2wh 5:a4fddd74263c 36 // just blink to let us know the CPU is alive
tzwell 9:c403dc9b86cc 37 while(true) {
tzwell 9:c403dc9b86cc 38 wait(BIG_DELAY);
joeata2wh 0:befb557584fb 39 myled = !myled;
joeata2wh 0:befb557584fb 40 }
joeata2wh 0:befb557584fb 41 }
joeata2wh 0:befb557584fb 42