Mbed firmware to capture 4 mic inputs and provide data over ethernet.

Dependencies:   EthernetInterface MODDMA mbed-rtos mbed

Files at this revision

API Documentation at this revision

Comitter:
Andrew Pullin
Date:
Wed Jul 30 14:58:05 2014 -0700
Commit message:
Initial commit of files

Changed in this revision

EthernetInterface.lib Show annotated file Show diff for this revision Revisions of this file
MODDMA.lib Show annotated file Show diff for this revision Revisions of this file
README.md Show annotated file Show diff for this revision Revisions of this file
main.cpp Show annotated file Show diff for this revision Revisions of this file
mbed-rtos.lib Show annotated file Show diff for this revision Revisions of this file
mbed.bld Show annotated file Show diff for this revision Revisions of this file
diff -r 000000000000 -r 7eb08d1a4037 EthernetInterface.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/EthernetInterface.lib	Wed Jul 30 14:58:05 2014 -0700
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/EthernetInterface/#e6b79f0ccd95
diff -r 000000000000 -r 7eb08d1a4037 MODDMA.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MODDMA.lib	Wed Jul 30 14:58:05 2014 -0700
@@ -0,0 +1,1 @@
+http://mbed.org/users/AjK/code/MODDMA/#97a16bf2ff43
diff -r 000000000000 -r 7eb08d1a4037 README.md
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/README.md	Wed Jul 30 14:58:05 2014 -0700
@@ -0,0 +1,6 @@
+DMA_Ethernet_Mbed
+=================
+
+modification of Andrew Kirkhams MODDMA code to send packets over Ethernet.
+
+https://mbed.org/users/AjK/
diff -r 000000000000 -r 7eb08d1a4037 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Jul 30 14:58:05 2014 -0700
@@ -0,0 +1,143 @@
+/*This code is based off of Andy Kirkham's
+*work making MODDMA.
+*http://mbed.org/users/AjK/code/MODDMA/
+*/
+#include "mbed.h"
+#include "MODDMA.h"
+#include "string.h"
+#include "EthernetInterface.h"
+
+#define SAMPLE_BUFFER_LENGTH 32
+
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+
+MODDMA dma;
+const int BROADCAST_PORT = 58083;
+
+// 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() {
+    //Set up the ethernet to broadcast
+    EthernetInterface eth;
+    eth.init(); //Use DHCP
+    eth.connect();
+    
+    UDPSocket sock;
+    sock.init();
+    sock.set_broadcasting();
+    
+    Endpoint broadcast;
+    broadcast.set_address("255.255.255.255", BROADCAST_PORT);
+    
+    // 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);
+  
+    // 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);
+    
+    char out_buffer[SAMPLE_BUFFER_LENGTH];
+    
+    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
+                memcpy(&out_buffer,&fVal,sizeof(fVal));
+            }
+        }
+        sock.sendTo(broadcast, out_buffer, sizeof(out_buffer));             
+        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");
+}
\ No newline at end of file
diff -r 000000000000 -r 7eb08d1a4037 mbed-rtos.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-rtos.lib	Wed Jul 30 14:58:05 2014 -0700
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed-rtos/#5dfe422a963d
diff -r 000000000000 -r 7eb08d1a4037 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Wed Jul 30 14:58:05 2014 -0700
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/0954ebd79f59
\ No newline at end of file