Stuart Scott
A simple program to read an analoge channel on the Freedom Kl25Z using the ticker object to control timing. The data is written into a circular buffer, which is read by the main loop and sent down the serial line.
Dependencies: FastAnalogIn mbed
Note that the Baud rate is set as 57600 rather than the default 9600.
Revision 0:eb0dc2b5bc51, committed 2014-07-23
- Comitter:
- sas37
- Date:
- Wed Jul 23 16:46:41 2014 +0000
- Child:
- 1:c424a90749e1
- Commit message:
- Version now running;
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/FastAnalogIn.lib Wed Jul 23 16:46:41 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/humlet/code/FastAnalogIn/#55274430c8df
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Jul 23 16:46:41 2014 +0000
@@ -0,0 +1,64 @@
+#include "mbed.h"
+#include "FastAnalogIn.h"
+
+/*
+Simple program which uses a ticker object to record and analoge value and store it in a cicular buffer.
+The ticker delay sets the sampling rate.
+
+The FastAnalogIn Library is used (http://mbed.org/users/Sissors/code/FastAnalogIn/) to rapidly sample
+a single channel.
+
+In the main loop a busy loop is used to send read the data from the cicular buffer and send down the serial line
+
+
+*/
+
+//size of cicular buffer
+#define BuffSize 255
+
+using namespace mbed;
+
+FastAnalogIn Ain(PTC2);
+
+Serial pc(USBTX, USBRX);
+Timer t;
+Ticker tock;
+
+//set the delay used by the ticker
+float delay = 0.01;
+
+//some circular buffers
+
+float data[BuffSize];
+float time_[BuffSize];
+long i =0;
+int j=0;
+long k =0;
+
+void ana()
+{
+ if(i<k+BuffSize)
+ {j = i%BuffSize;
+ //time_[j]=t.read();
+ data[j]=Ain.read();
+ time_[j]=t.read();
+ i++;
+ }
+}
+
+
+int main()
+{
+ pc.baud(57600);
+ t.start();
+ tock.attach(&ana,delay);
+ while (true) {
+ if(k<i)
+ {
+ pc.printf("%f,%f\n",time_[k%BuffSize],data[k%BuffSize]);
+ k++;
+ }
+
+
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed Jul 23 16:46:41 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/04dd9b1680ae \ No newline at end of file