Ibrahim Abd Elkader
BMA180 triple axis accelerometer example. https://www.sparkfun.com/commerce/product_info.php?products_id=9723
Revision 0:10e5fb9080cf, committed 2010-11-10
- Comitter:
- mux
- Date:
- Wed Nov 10 20:13:23 2010 +0000
- Commit message:
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
diff -r 000000000000 -r 10e5fb9080cf main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Nov 10 20:13:23 2010 +0000
@@ -0,0 +1,53 @@
+#include "mbed.h"
+#define BMA180_ID 0x00
+#define BMA180_ADDR 0x80 //datasheet says 0x40 !
+#define BMA180_X_ACC 0x02
+#define BMA180_Y_ACC 0x04
+#define BMA180_Z_ACC 0x06
+#define BMA180_SDA p9
+#define BMA180_SCL p10
+I2C i2c(BMA180_SDA, BMA180_SCL);
+
+int main() {
+ char data[2];
+ int16_t x,y,z;
+
+ i2c.frequency(100000);
+
+ //read chip_id
+ data[0] = BMA180_ID;
+ data[1] = 0x00;
+
+ i2c.write(BMA180_ADDR, data, 1);
+ i2c.read(BMA180_ADDR, data, 1);
+
+ if (data[0] != 0x03) {
+ printf("invalid chip id %d\n", data[0]);
+ return 1;
+ }
+
+ while(1) {
+ data[0] = BMA180_X_ACC;
+ i2c.write(BMA180_ADDR, data, 1);
+ i2c.read(BMA180_ADDR, data, 2);
+ data[0] >>= 2;
+ x = *((int16_t*)data);
+
+ data[0] = BMA180_Y_ACC;
+ i2c.write(BMA180_ADDR, data, 1);
+ i2c.read(BMA180_ADDR, data, 2);
+ data[0] >>= 2;
+ y = *((int16_t*)data);
+
+ data[0] = BMA180_Z_ACC;
+ i2c.write(BMA180_ADDR, data, 1);
+ i2c.read(BMA180_ADDR, data, 2);
+ data[0] >>= 2;
+ z = *((int16_t*)data);
+
+ //printf("x: %d y: %d z: %d\n", x, y, z);
+ printf("x: %.1f y: %.1f z: %.1f\n", x/16384.0f, y/16384.0f, z/16384.0f); //2^14
+
+ wait_ms(100);
+ }
+}
diff -r 000000000000 -r 10e5fb9080cf mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed Nov 10 20:13:23 2010 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/e2ac27c8e93e