Diff: example2.cpp

Revision:

10:3a46c1e383a4

Parent:

9:e7ecf909e834

Child:

11:19009be5a0e7

--- a/example2.cpp	Tue Mar 08 17:47:43 2011 +0000
+++ b/example2.cpp	Fri Mar 11 13:47:23 2011 +0000
@@ -8,7 +8,7 @@
 #include "mbed.h"
 #include "MODDMA.h"
 
-#define SAMPLE_BUFFER_LENGTH 32
+#define SAMPLE_BUFFER_LENGTH 30
 
 DigitalOut led1(LED1);
 DigitalOut led2(LED2);
@@ -27,7 +27,7 @@
 int main() {
 
     // Create a buffer to hold the ADC samples and clear it.
-    // Note, we are going to sample two ADC inputs so they
+    // Note, we are going to sample three ADC inputs so they
     // end up in this buffer "interleaved". So you will want
     // a buffer twice this size to a real life given sample
     // frequency. See the printf() output for details.
@@ -40,16 +40,18 @@
     
     // Power up the ADC and set PCLK
     LPC_SC->PCONP    |=  (1UL << 12);
-    LPC_SC->PCLKSEL0 &= ~(3UL << 24); // PCLK = CCLK/4 96M/4 = 24MHz
+    LPC_SC->PCLKSEL0 &= ~(3UL << 16); // PCLK = CCLK/4 96M/4 = 24MHz
     
-    // Enable the ADC, 12MHz,  ADC0.0 & .1
-    LPC_ADC->ADCR  = (1UL << 21) | (1UL << 8) | (3UL << 0); 
+    // Enable the ADC, 12MHz,  ADC0.0, .1 & .2
+    LPC_ADC->ADCR  = (1UL << 21) | (1UL << 8) | (7UL << 0); 
     
     // Set the pin functions to ADC
-    LPC_PINCON->PINSEL1 &= ~(3UL << 14);  /* P0.23, Mbed p15. */
+    LPC_PINCON->PINSEL1 &= ~(3UL << 14);  /* P0.23, Mbed p15 AD0.0 */
     LPC_PINCON->PINSEL1 |=  (1UL << 14);
-    LPC_PINCON->PINSEL1 &= ~(3UL << 16);  /* P0.24, Mbed p16. */
+    LPC_PINCON->PINSEL1 &= ~(3UL << 16);  /* P0.24, Mbed p16 AD0.1 */
     LPC_PINCON->PINSEL1 |=  (1UL << 16);
+    LPC_PINCON->PINSEL1 &= ~(3UL << 18);  /* P0.25, Mbed p17 AD0.2 */
+    LPC_PINCON->PINSEL1 |=  (1UL << 18);
     
     // Setup the serial port to print out results.
     pc.baud(115200);
@@ -83,7 +85,7 @@
     // just set the global flag.
     LPC_ADC->ADINTEN = 0x100;
 
-    // Enable burst mode on inputs 0 and 1.
+    // Enable burst mode on inputs 0, 1 and 2.
     LPC_ADC->ADCR |= (1UL << 16); 
     
     while (1) {