Daniel Darvill
Read acceleromter data
Revision 0:e7803aa951be, committed 2016-01-25
- Comitter:
- dandarvill
- Date:
- Mon Jan 25 14:17:24 2016 +0000
- Commit message:
- Version test
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/BLE_API.lib Mon Jan 25 14:17:24 2016 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/teams/Bluetooth-Low-Energy/code/BLE_API/#bfc5b9b6ecf5
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Mon Jan 25 14:17:24 2016 +0000
@@ -0,0 +1,41 @@
+#include "mbed.h"
+
+SPI acc(p9,p11,p8); // setup SPI interface on pins 9,11,8. MOSI, MISO, SCK
+
+DigitalOut cs(p10); // use pin 10 as chip select
+
+Serial pc(USBTX, USBRX); // setup USB interface (change to set up BLE)
+
+char buffer[6]; // raw data array type char
+
+signed short data[3]; // acc data is signed 16 bit from -32,768 to +32,767
+
+float x, y, z; // floating point data
+
+int main() {
+ cs=1;
+ acc.format(8,3); // 8 bit data, Mode 3
+ acc.frequency(2000000); // 2MHz clock rate
+ cs=0;
+ acc.write(0x31); // data format register, select 4 wire mode
+ acc.write(0x0B); // format +/-16g, 0.004g/LSB
+ cs=1;
+ cs=0;
+ acc.write(0x2D); // power ctrl register
+ acc.write(0x08); // measure mode
+ cs=1;
+ while (1) { // infinite loop
+ wait(0.2);
+ cs=0;
+ acc.write(0x80|0x40|0x32); // RW bit high, MB bit high, plus address
+ for (int i = 0;i<=5;i++) {
+ buffer[i]=acc.write(0x00); // read back 6 data bytes
+ }
+ cs=1;
+ data[0] = buffer[1]<<8 | buffer[0]; // combine MSB and LSB
+ data[1] = buffer[3]<<8 | buffer[2];
+ data[2] = buffer[5]<<8 | buffer[4];
+ x=0.004*data[0]; y=0.004*data[1]; z=0.004*data[2]; // convert to floating point
+ pc.printf("x = %+1.2fg\t y = %+1.2fg\t z = %+1.2fg\n\r", x, y,z); //print to screen (change to publish)
+ }
+ }
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Mon Jan 25 14:17:24 2016 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/9296ab0bfc11 \ No newline at end of file