Michael Coe
modification of Andrew Kirkhams MODDMA code to send packets over Ethernet and using multiple ADC channels
Dependencies: EthernetInterface MODDMA mbed-rtos mbed
Revision 0:68a1564919d0, committed 2014-08-05
- Comitter:
- michaelcoe
- Date:
- Tue Aug 05 22:06:11 2014 +0000
- Commit message:
- Initial Commit
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/EthernetInterface.lib Tue Aug 05 22:06:11 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/EthernetInterface/#f69b81aa9eb1
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/MODDMA.lib Tue Aug 05 22:06:11 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/AjK/code/MODDMA/#97a16bf2ff43
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Tue Aug 05 22:06:11 2014 +0000
@@ -0,0 +1,146 @@
+/*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 NUM_SAMPLES 1024
+#define BYTES_PER_SAMPLE sizeof(uint16_t) / sizeof(char)
+#define NUM_CHANNELS 4
+#define SAMPLE_BUFF_LEN NUM_SAMPLES*NUM_CHANNELS
+#define SAMPLE_BUFF_BYTES SAMPLE_BUFF_LEN * BYTES_PER_SAMPLE
+
+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.
+ uint16_t adcInputBuffer[SAMPLE_BUFF_LEN];
+ memset(adcInputBuffer, 0, SAMPLE_BUFF_BYTES);
+
+ // 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);
+ LPC_ADC->ADCR = (1UL << 21) | (1UL << 8) | (15UL << 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);
+ LPC_PINCON->PINSEL1 &= ~(3UL << 18); /* P0.25, Mbed p17. */
+ LPC_PINCON->PINSEL1 |= (1UL << 18);
+ LPC_PINCON->PINSEL1 &= ~(3UL << 20); /* P0.26, Mbed p18. */
+ LPC_PINCON->PINSEL1 |= (1UL << 20);
+
+ // Prepare an ADC configuration.
+ MODDMA_Config *conf = new MODDMA_Config;
+ conf
+ ->channelNum ( MODDMA::Channel_0 )
+ ->srcMemAddr ( 0 )
+ ->dstMemAddr ( (uint32_t)adcInputBuffer ) //NOT a dereference, just storing a 32bit pointer value as int
+ ->transferSize ( SAMPLE_BUFF_LEN )
+ ->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;
+ }
+ //sock.sendTo(broadcast, out_buffer, sizeof(out_buffer));
+ sock.sendTo(broadcast, (char*)adcInputBuffer, SAMPLE_BUFF_BYTES);
+ 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");
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-rtos.lib Tue Aug 05 22:06:11 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed-rtos/#34e80e862021
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Tue Aug 05 22:06:11 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/0954ebd79f59 \ No newline at end of file