Mischa Megens
/
DACDMAfuncgenlib
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Dependencies: DMAFuncGen MODDMA mbed
Revision 0:697cc11ace92, committed 2013-12-29
- Comitter:
- Mischa
- Date:
- Sun Dec 29 01:13:41 2013 +0000
- Commit message:
- Demonstration program for the DMAFuncGen library
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/DMAFuncGen.lib Sun Dec 29 01:13:41 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/Mischa/code/DMAFuncGen/#337ad0fe7734
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/MODDMA.lib Sun Dec 29 01:13:41 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/AjK/code/MODDMA/#97a16bf2ff43
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Sun Dec 29 01:13:41 2013 +0000
@@ -0,0 +1,46 @@
+/*
+ * Demonstrates sending a buffer repeatedly to the DAC using DMA.
+ * Connect an oscilloscope to Mbed pin 18.
+ */
+
+#include "mbed.h"
+#include "DMAFuncGen.h"
+
+AnalogIn ain(p17);
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+DigitalOut led3(LED3);
+DigitalOut led4(LED4);
+
+MODDMA dma;
+DMAFuncGen fg(dma, MODDMA::Channel_0);
+
+int main() {
+ wait(0.5);
+
+ // Create waveform.
+ fg.buffer_size=400;
+ fg.buffer = new uint32_t[fg.buffer_size];
+ const float PI = 3.1415927;
+ for (int i=0; i<fg.buffer_size; i++) {
+ int x = (511*sin(2*PI*i/fg.buffer_size)) +512;
+ fg.set(i,x << 6);
+ }
+
+ fg.Connect();
+ fg.Setup();
+ fg.SetFrequency(0.5);
+ printf("Frequency: %f\r\n",fg.Frequency());
+ fg.Start();
+
+ // Simple oscilloscope, using the LEDs -
+ // Connect pin 18 (DAC) to p17 (ADC) for it to work.
+ float z;
+ while (1){
+ z=ain.read();
+ led1 = (z > 0.2) ? 1 : 0;
+ led2 = (z > 0.4) ? 1 : 0;
+ led3 = (z > 0.6) ? 1 : 0;
+ led4 = (z > 0.8) ? 1 : 0;
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.lib Sun Dec 29 01:13:41 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/#dc225afb6914