Revision 8:8a17f65622b4, committed 2014-09-10

Comitter:

vsluiter

Date:

Wed Sep 10 05:05:59 2014 +0000

Parent:

7:3396c3e33928

Child:

9:d33e7b175ad7

Commit message:

Updated to read u16, reduced sample rate

Changed in this revision

--- a/main.cpp	Wed Sep 10 04:59:25 2014 +0000
+++ b/main.cpp	Wed Sep 10 05:05:59 2014 +0000
@@ -4,8 +4,8 @@
 //Define objects
 AnalogIn    emg0(PTB1); //Analog input
 PwmOut      red(LED_RED); //PWM output
-Ticker timer;
-MODSERIAL pc(USBTX,USBRX,64,1024);
+Ticker log_timer;
+MODSERIAL pc(USBTX,USBRX);
 
 /** Looper function
 * functions used for Ticker and Timeout should be of type void <name>(void)
@@ -16,21 +16,22 @@
 * To make a variable global, define it under the includes.
 * variables that are changed in the interrupt routine (written to) should be made
 * 'volatile' to let the compiler know that those values may change outside the current context.
-* i.e.: "volatile float emg_value;" instead of "float emg_value"
+* i.e.: "volatile uint16_t emg_value;" instead of "uint16_t emg_value"
 * in the example below, the variable is not re-used in the main function, and is thus declared
 * local in the looper function only.
 **/
 void looper()
 {
     /*variable to store value in*/    
-    float emg_value;
+    uint16_t emg_value;
     /*put raw emg value both in red and in emg_value*/
-    red = emg_value = emg0.read();
-    /*send value to PC. use 6 digits after decimal sign*/
+    red = emg0.read();      // read float value (0..1 = 0..3.3V)
+    emg_value = emg0.read_u16(); // read direct ADC result (0..4096 = 0..3.3V)
+    /*send value to PC. Line below is used to prevent buffer overrun */
     if(pc.rxBufferGetSize(0)-pc.rxBufferGetCount() > 30)
-        pc.printf("%.6f\n",emg_value);
+        pc.printf("%u\n",emg_value);
     /**When not using the LED, the above could also have been done this way:
-    * pc.printf("%.6\n", emg0.read());
+    * pc.printf("%u\n", emg0.read_u16());
     */
 }
 
@@ -41,10 +42,10 @@
     /*set the period for the PWM to the red LED*/
     red.period_ms(2);
     /**Here you attach the 'void looper(void)' function to the Ticker object
-    * The looper() function will be called every 0.001 seconds.
+    * The looper() function will be called every 0.002 seconds.
     * Please mind that the parentheses after looper are omitted when using attach.
     */
-    timer.attach(looper, 0.005);
+    log_timer.attach(looper, 0.01);
     while(1) //Loop
     {
       /*Empty!*/

--- a/mbed.bld	Wed Sep 10 04:59:25 2014 +0000
+++ b/mbed.bld	Wed Sep 10 05:05:59 2014 +0000
@@ -1,1 +1,1 @@
-http://mbed.org/users/mbed_official/code/mbed/builds/b3110cd2dd17
\ No newline at end of file
+http://mbed.org/users/mbed_official/code/mbed/builds/9327015d4013
\ No newline at end of file