Diff: example2.cpp

Revision:

12:1dfee7208043

Parent:

11:19009be5a0e7

Child:

13:846c8b6ffb7f

--- a/example2.cpp	Sun Mar 13 12:46:55 2011 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,140 +0,0 @@
-#ifdef COMPILE_EXAMPLE2_CODE_MODDMA
-
-/*
- * This example was provided to support Mbed forum thread:-
- * http://mbed.org/forum/mbed/topic/1798
- */
- 
-#include "mbed.h"
-#include "MODDMA.h"
-
-#define SAMPLE_BUFFER_LENGTH 32
-
-DigitalOut led1(LED1);
-DigitalOut led2(LED2);
-
-MODDMA dma;
-Serial pc(USBTX, USBRX);
-
-// ISR set's this when transfer complete.
-bool dmaTransferComplete = false;
-
-// Function prototypes for IRQ callbacks.
-// See definitions following main() below.
-void TC0_callback(void);
-void ERR0_callback(void);
-
-int main() {
-
-    // Create a buffer to hold the ADC samples and clear it.
-    // Note, we are going to sample two 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.
-    uint32_t adcInputBuffer[SAMPLE_BUFFER_LENGTH];    
-    memset(adcInputBuffer, 0, sizeof(adcInputBuffer));
-    
-    // We use the ADC irq to trigger DMA and the manual says
-    // that in this case the NVIC for ADC must be disabled.
-    NVIC_DisableIRQ(ADC_IRQn);
-    
-    // Power up the ADC and set PCLK
-    LPC_SC->PCONP    |=  (1UL << 12);
-    LPC_SC->PCLKSEL0 &= ~(3UL << 24); // PCLK = CCLK/4 96M/4 = 24MHz
-    
-    // Enable the ADC, 12MHz,  ADC0.0 & .1
-    LPC_ADC->ADCR  = (1UL << 21) | (1UL << 8) | (3UL << 0); 
-    
-    // Set the pin functions to ADC
-    LPC_PINCON->PINSEL1 &= ~(3UL << 14);  /* P0.23, Mbed p15. */
-    LPC_PINCON->PINSEL1 |=  (1UL << 14);
-    LPC_PINCON->PINSEL1 &= ~(3UL << 16);  /* P0.24, Mbed p16. */
-    LPC_PINCON->PINSEL1 |=  (1UL << 16);
-    
-    // Setup the serial port to print out results.
-    pc.baud(115200);
-    pc.printf("ADC with DMA example\n");
-    pc.printf("====================\n");
-    
-    // Prepare an ADC configuration.
-    MODDMA_Config *conf = new MODDMA_Config;
-    conf
-     ->channelNum    ( MODDMA::Channel_0 )
-     ->srcMemAddr    ( 0 )
-     ->dstMemAddr    ( (uint32_t)adcInputBuffer )
-     ->transferSize  ( SAMPLE_BUFFER_LENGTH )
-     ->transferType  ( MODDMA::p2m )
-     ->transferWidth ( MODDMA::word )
-     ->srcConn       ( MODDMA::ADC )
-     ->dstConn       ( 0 )
-     ->dmaLLI        ( 0 )
-     ->attach_tc     ( &TC0_callback )
-     ->attach_err    ( &ERR0_callback )
-    ; // end conf.
-    
-    // Prepare configuration.
-    dma.Setup( conf );
-    
-    // Enable configuration.
-    dma.Enable( conf );
-    
-    // Enable ADC irq flag (to DMA).
-    // Note, don't set the individual flags,
-    // just set the global flag.
-    LPC_ADC->ADINTEN = 0x100;
-
-    // Enable burst mode on inputs 0 and 1.
-    LPC_ADC->ADCR |= (1UL << 16); 
-    
-    while (1) {
-        // When transfer complete do this block.
-        if (dmaTransferComplete) {
-            delete conf; // No memory leaks, delete the configuration.
-            dmaTransferComplete = false;
-            for (int i = 0; i < SAMPLE_BUFFER_LENGTH; i++) {
-                int channel = (adcInputBuffer[i] >> 24) & 0x7;
-                int iVal = (adcInputBuffer[i] >> 4) & 0xFFF;
-                double fVal = 3.3 * (double)((double)iVal) / ((double)0x1000); // scale to 0v to 3.3v
-                pc.printf("Array index %02d : ADC input channel %d = 0x%03x %01.3f volts\n", i, channel, iVal, fVal);                  
-            }
-        }
-        
-        // Just flash LED1 for something to do.
-        led1 = !led1;
-        wait(0.25);        
-    }
-}
-
-// Configuration callback on TC
-void TC0_callback(void) {
-    
-    MODDMA_Config *config = dma.getConfig();
-    
-    // Disbale burst mode and switch off the IRQ flag.
-    LPC_ADC->ADCR &= ~(1UL << 16);
-    LPC_ADC->ADINTEN = 0;    
-    
-    // Finish the DMA cycle by shutting down the channel.
-    dma.haltAndWaitChannelComplete( (MODDMA::CHANNELS)config->channelNum());
-    dma.Disable( (MODDMA::CHANNELS)config->channelNum() );
-    
-    // Tell main() while(1) loop to print the results.
-    dmaTransferComplete = true;            
-    
-    // Switch on LED2 to show transfer complete.
-    led2 = 1;        
-    
-    // Clear DMA IRQ flags.
-    if (dma.irqType() == MODDMA::TcIrq) dma.clearTcIrq();    
-    if (dma.irqType() == MODDMA::ErrIrq) dma.clearErrIrq();
-}
-
-// Configuration callback on Error
-void ERR0_callback(void) {
-    // Switch off burst conversions.
-    LPC_ADC->ADCR |= ~(1UL << 16);
-    LPC_ADC->ADINTEN = 0;
-    error("Oh no! My Mbed EXPLODED! :( Only kidding, go find the problem");
-}
-
-#endif