Rune Langoy
/
I2C_detect_address
Important changes to repositories hosted on mbed.com
Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.
To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.
It is also possible to export all your personal repositories from the account settings page.
Fork of
LAB11_Oppgave1
by 
EL-POM1001
Revision 1:2d9d32fc4f5d, committed 2015-11-10
- Comitter:
- rlanghbv
- Date:
- Tue Nov 10 13:25:36 2015 +0000
- Parent:
- 0:81fa0e3e8a6c
- Commit message:
- First commit
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
--- a/main.cpp Mon Nov 09 13:39:59 2015 +0000
+++ b/main.cpp Tue Nov 10 13:25:36 2015 +0000
@@ -1,17 +1,20 @@
#include "mbed.h"
- //SDA , SCL
-I2C i2cBus(PB_9, PB_8);
+I2C i2cBus(I2C_SDA, I2C_SCL);
int main()
{
- i2cBus.frequency(100000);
-
- //Scan the valid I2C addresrange: 0x3 to 0x77
- for (int i2cAddres=3; i2cAddres<=0x77; i2cAddres++) {
- if (!i2cBus.write(i2cAddres<<1, NULL, 0)) { // 0 if a device ACK'ed the message
- printf("\r\nI2C device found at address 0x%02X \r\n", i2cAddres);
- }
- }
+ i2cBus.frequency(100000);
+
+ int i2cAddres=0x68; // Address of DS1307 is 0x68 (7 bit address)
+ int i2c8BitAddres= i2cAddres <<1; // Convert to 8bit addressing used by mbed
+
+ int result=i2cBus.write(i2c8BitAddres, NULL, 0);
+
+ //0 on success (ack), non-0 on failure (nack)
+ if (result==0)
+ printf("I2C device found at address 0x%02X \r\n", i2cAddres);
+ else
+ printf("I2C device Not found at address 0x%02X \r\n", i2cAddres);
}