Siva ram
/
I2Cboot
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I2C_HelloWorld_Mbed
by 
mbed official
Revision 3:ab0e4b55d7da, committed 2014-09-21
- Comitter:
- mbedAustin
- Date:
- Sun Sep 21 19:01:55 2014 +0000
- Parent:
- 2:e8a851d1b143
- Child:
- 4:df6232c70efd
- Commit message:
- added notes on use for clarity. made it obvious we use 8bit addressing
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
--- a/main.cpp Sun Sep 21 18:36:51 2014 +0000
+++ b/main.cpp Sun Sep 21 19:01:55 2014 +0000
@@ -2,22 +2,23 @@
// Read temperature from LM75BD
-I2C i2c(p28, p27);
+I2C i2c(I2C_SDA , I2C_SCL );
-const int addr = 0x90;
+const int addr7bit = 0x48; // 7 bit I2C address
+const int addr8bit = 0x48 << 1; // 8bit I2C address, 0x90
int main() {
char cmd[2];
while (1) {
cmd[0] = 0x01;
cmd[1] = 0x00;
- i2c.write(addr, cmd, 2);
+ i2c.write(addr8bit, cmd, 2);
wait(0.5);
cmd[0] = 0x00;
- i2c.write(addr, cmd, 1);
- i2c.read(addr, cmd, 2);
+ i2c.write(addr8bit, cmd, 1);
+ i2c.read( addr8bit, cmd, 2);
float tmp = (float((cmd[0]<<8)|cmd[1]) / 256.0);
printf("Temp = %.2f\n", tmp);