Andrew p
Mbed firmware to capture 4 mic inputs and provide data over ethernet.
Dependencies: EthernetInterface MODDMA mbed-rtos mbed
Revision 0:7eb08d1a4037, committed 2014-07-30
- Comitter:
- Andrew Pullin
- Date:
- Wed Jul 30 14:58:05 2014 -0700
- Commit message:
- Initial commit of files
Changed in this revision
--- /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
--- /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
--- /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/
--- /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
--- /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
--- /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