mbed_example
I2C Hello World, I2C Example
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I2C_HelloWorld_Mbed
by 
Mbed
Use
The mbed I2C API uses 8 bit addressing and will auto append the 0 or 1 for read/write mode. Please keep in mind that every I2C set up has its own quirks so this example may not work out of the box for your sensor / application. Make sure to check the data sheet for your part for the timing / register access specification.
API
API reference.
Import librarymbed
No documentation found.
Diff: main.cpp
- Revision:
- 0:f76c26307f9a
- Child:
- 2:ab0e4b55d7da
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Thu Feb 14 17:24:48 2013 +0000
@@ -0,0 +1,25 @@
+#include "mbed.h"
+
+// Read temperature from LM75BD
+
+I2C i2c(p28, p27);
+
+const int addr = 0x90;
+
+int main() {
+ char cmd[2];
+ while (1) {
+ cmd[0] = 0x01;
+ cmd[1] = 0x00;
+ i2c.write(addr, cmd, 2);
+
+ wait(0.5);
+
+ cmd[0] = 0x00;
+ i2c.write(addr, cmd, 1);
+ i2c.read(addr, cmd, 2);
+
+ float tmp = (float((cmd[0]<<8)|cmd[1]) / 256.0);
+ printf("Temp = %.2f\n", tmp);
+ }
+}
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