Nikola Cvetković
I2C_2 bus scanner for STM32L476RG.
main.cpp@8:ead6147e31a4, 2016-03-30 (annotated)
- Committer:
- joeata2wh
- Date:
- Wed Mar 30 14:58:05 2016 +0000
- Revision:
- 8:ead6147e31a4
- Parent:
- 7:5962e77516ac
- Child:
- 9:c403dc9b86cc
Update to use standard MIT license
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| joeata2wh | 0:befb557584fb | 1 | /* Scan I2C bus on specified pins and prints out |
| joeata2wh | 6:02a058f2ec6f | 2 | * the all address where an active device responds. |
| joeata2wh | 0:befb557584fb | 3 | * |
| joeata2wh | 8:ead6147e31a4 | 4 | By Joseph Ellsworth CTO of A2WH |
| joeata2wh | 8:ead6147e31a4 | 5 | Take a look at A2WH.com Producing Water from Air using Solar Energy |
| joeata2wh | 8:ead6147e31a4 | 6 | March-2016 License: https://developer.mbed.org/handbook/MIT-Licence |
| joeata2wh | 8:ead6147e31a4 | 7 | Please contact us http://a2wh.com for help with custom design projects. |
| joeata2wh | 8:ead6147e31a4 | 8 | |
| joeata2wh | 8:ead6147e31a4 | 9 | |
| joeata2wh | 6:02a058f2ec6f | 10 | * Don't forget 3K pull-up resistors on sda,scl |
| joeata2wh | 2:e90c47d4f358 | 11 | * |
| joeata2wh | 2:e90c47d4f358 | 12 | * I tested this by soldering in a I2C chip known to respond at |
| joeata2wh | 2:e90c47d4f358 | 13 | * address dec=120 hex=70 and the utility got the ack as expected. |
| joeata2wh | 2:e90c47d4f358 | 14 | * when the chip was de-soldered it was no longer detected. |
| joeata2wh | 2:e90c47d4f358 | 15 | */ |
| joeata2wh | 0:befb557584fb | 16 | |
| joeata2wh | 0:befb557584fb | 17 | #include "mbed.h" |
| joeata2wh | 0:befb557584fb | 18 | |
| joeata2wh | 0:befb557584fb | 19 | Serial pc(USBTX, USBRX); |
| joe ellsworth |
7:5962e77516ac | 20 | Serial pc2(USBTX, USBRX); |
| joeata2wh | 0:befb557584fb | 21 | |
| joeata2wh | 1:2363995f603f | 22 | #define D_SDA PB_7 |
| joeata2wh | 0:befb557584fb | 23 | #define D_SCL PB_6 |
| joeata2wh | 0:befb557584fb | 24 | // sda=PB7, scl=PB_6 Pins specific to Nucleo-F303K8 |
| joeata2wh | 0:befb557584fb | 25 | // must change pins to match your board. |
| joeata2wh | 0:befb557584fb | 26 | |
| joeata2wh | 0:befb557584fb | 27 | I2C i2c(D_SDA, D_SCL); |
| joeata2wh | 0:befb557584fb | 28 | |
| joeata2wh | 0:befb557584fb | 29 | DigitalOut myled(LED1); |
| joeata2wh | 0:befb557584fb | 30 | |
| joeata2wh | 4:ad1195c10812 | 31 | int ack; |
| joeata2wh | 6:02a058f2ec6f | 32 | int address; |
| joeata2wh | 0:befb557584fb | 33 | void scanI2C() { |
| joeata2wh | 0:befb557584fb | 34 | for(address=1;address<127;address++) { |
| joeata2wh | 0:befb557584fb | 35 | ack = i2c.write(address, "11", 1); |
| joeata2wh | 0:befb557584fb | 36 | if (ack == 0) { |
| joeata2wh | 0:befb557584fb | 37 | pc.printf("\tFound at %3d -- %3x\r\n", address,address); |
| joeata2wh | 0:befb557584fb | 38 | } |
| joeata2wh | 0:befb557584fb | 39 | wait(0.05); |
| joeata2wh | 0:befb557584fb | 40 | } |
| joeata2wh | 0:befb557584fb | 41 | } |
| joeata2wh | 0:befb557584fb | 42 | |
| joeata2wh | 0:befb557584fb | 43 | int main() { |
| joeata2wh | 0:befb557584fb | 44 | pc.baud(9600); |
| joeata2wh | 0:befb557584fb | 45 | pc.printf("I2C scanner \r\n"); |
| joeata2wh | 0:befb557584fb | 46 | scanI2C(); |
| joeata2wh | 0:befb557584fb | 47 | pc.printf("Finished Scan\r\n"); |
| joeata2wh | 5:a4fddd74263c | 48 | // just blink to let us know the CPU is alive |
| joeata2wh | 0:befb557584fb | 49 | while(1) { |
| joeata2wh | 0:befb557584fb | 50 | wait(5.0); |
| joeata2wh | 0:befb557584fb | 51 | myled = !myled; |
| joeata2wh | 0:befb557584fb | 52 | } |
| joeata2wh | 0:befb557584fb | 53 | } |
| joeata2wh | 0:befb557584fb | 54 |