Kevin Tseng / MODDMA

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Dependents:   DSHOT_test

Files at this revision

API Documentation at this revision

Revision 18:e7d62a489a83, committed 2019-04-25

Comitter:
ktseng
Date:
Thu Apr 25 19:20:22 2019 +0000
Parent:
17:97a16bf2ff43
Commit message:
Test;

Changed in this revision

example3.h Show annotated file Show diff for this revision Revisions of this file 
--- a/example3.h	Sat Mar 02 19:27:12 2013 +0000
+++ b/example3.h	Thu Apr 25 19:20:22 2019 +0000
@@ -16,7 +16,7 @@
 // Value is in microseconds. (500000 is half a second).
 #define SAMPLE_PERIOD   500000
 
-#define NUM_OF_SAMPLES  5
+#define NUM_OF_SAMPLES  16
 
 Serial pc(USBTX, USBRX);
 
@@ -37,19 +37,15 @@
 int main() {
     volatile int life_counter = 0;
      
-    // Macros defined in iomacros.h, saves messing with DigitalIn
-    p30_AS_INPUT; p30_MODE( PIN_PULLUP ); // P0.4
-    p29_AS_INPUT; p29_MODE( PIN_PULLUP ); // P0.5
-    p8_AS_INPUT;  p8_MODE( PIN_PULLUP );  // P0.6
-    p7_AS_INPUT;  p7_MODE( PIN_PULLUP );  // P0.7
+    // Sets bits 4-7 on port 0 to pulled down outputs.
+    p30_AS_OUTPUT; p30_MODE( PIN_PULLDOWN ); // P0.4
+    p29_AS_OUTPUT; p29_MODE( PIN_PULLDOWN ); // P0.5
+    p8_AS_OUTPUT;  p8_MODE( PIN_PULLDOWN );  // P0.6
+    p7_AS_OUTPUT;  p7_MODE( PIN_PULLDOWN );  // P0.7
     
     // Clear the buffer.
     memset(buffer, 0, sizeof(buffer));
     
-    // Setup the serial port to print out results.
-    pc.baud(115200);
-    pc.printf("Starting up...\n");
-    
     // Set-up timer1 as a periodic timer.
     LPC_SC->PCONP    |= (1UL << 2); // TIM1 On
     LPC_SC->PCLKSEL0 |= (3UL << 4); // CCLK/8 = 12MHz
@@ -61,10 +57,10 @@
     conf = new MODDMA_Config;
     conf
      ->channelNum    ( MODDMA::Channel_0 )
-     ->srcMemAddr    ( (uint32_t)&LPC_GPIO0->FIOPIN )
-     ->dstMemAddr    ( (uint32_t)&buffer[0] )
+     ->srcMemAddr    ( (uint32_t)&buffer[0] ) //Buffer data to be transferred
+     ->dstMemAddr    ( (uint32_t)&LPC_GPIO0->FIOPIN ) //GPIO to be transferred
      ->transferSize  ( NUM_OF_SAMPLES )
-     ->transferType  ( MODDMA::g2m ) // pseudo transfer code MODDMA understands.
+     ->transferType  ( MODDMA::m2g ) // pseudo transfer code MODDMA understands.
      ->transferWidth ( MODDMA::word )
      ->srcConn       ( MODDMA::MAT1_0 )
      ->dmacSync      ( MODDMA::MAT1_0 )