Suga koubou / Mbed 2 deprecated MODDMA_LLI_test

GPDMA (Direct Memory Access) and LLI (Link List Item) test see: http://mbed.org/users/okini3939/notebook/dma_jp/

Dependencies:   mbed

MODDMA/example2.h@0:de79d4a48e63, 2013-09-13 (annotated)

Committer:
okini3939
Date:
Fri Sep 13 14:49:52 2013 +0000
Revision:
0:de79d4a48e63
GPDMA (Direct Memory Access) and LLI (Link List Item) test

Who changed what in which revision?

UserRevisionLine numberNew contents of line
okini3939 0:de79d4a48e63 1 /*
okini3939 0:de79d4a48e63 2 * This example was provided to support Mbed forum thread:-
okini3939 0:de79d4a48e63 3 * http://mbed.org/forum/mbed/topic/1798
okini3939 0:de79d4a48e63 4 */
okini3939 0:de79d4a48e63 5
okini3939 0:de79d4a48e63 6 #include "mbed.h"
okini3939 0:de79d4a48e63 7 #include "MODDMA.h"
okini3939 0:de79d4a48e63 8
okini3939 0:de79d4a48e63 9 #define SAMPLE_BUFFER_LENGTH 32
okini3939 0:de79d4a48e63 10
okini3939 0:de79d4a48e63 11 DigitalOut led1(LED1);
okini3939 0:de79d4a48e63 12 DigitalOut led2(LED2);
okini3939 0:de79d4a48e63 13
okini3939 0:de79d4a48e63 14 MODDMA dma;
okini3939 0:de79d4a48e63 15 Serial pc(USBTX, USBRX);
okini3939 0:de79d4a48e63 16
okini3939 0:de79d4a48e63 17 // ISR set's this when transfer complete.
okini3939 0:de79d4a48e63 18 bool dmaTransferComplete = false;
okini3939 0:de79d4a48e63 19
okini3939 0:de79d4a48e63 20 // Function prototypes for IRQ callbacks.
okini3939 0:de79d4a48e63 21 // See definitions following main() below.
okini3939 0:de79d4a48e63 22 void TC0_callback(void);
okini3939 0:de79d4a48e63 23 void ERR0_callback(void);
okini3939 0:de79d4a48e63 24
okini3939 0:de79d4a48e63 25 int main() {
okini3939 0:de79d4a48e63 26
okini3939 0:de79d4a48e63 27 // Create a buffer to hold the ADC samples and clear it.
okini3939 0:de79d4a48e63 28 // Note, we are going to sample two ADC inputs so they
okini3939 0:de79d4a48e63 29 // end up in this buffer "interleaved". So you will want
okini3939 0:de79d4a48e63 30 // a buffer twice this size to a real life given sample
okini3939 0:de79d4a48e63 31 // frequency. See the printf() output for details.
okini3939 0:de79d4a48e63 32 uint32_t adcInputBuffer[SAMPLE_BUFFER_LENGTH];
okini3939 0:de79d4a48e63 33 memset(adcInputBuffer, 0, sizeof(adcInputBuffer));
okini3939 0:de79d4a48e63 34
okini3939 0:de79d4a48e63 35 // We use the ADC irq to trigger DMA and the manual says
okini3939 0:de79d4a48e63 36 // that in this case the NVIC for ADC must be disabled.
okini3939 0:de79d4a48e63 37 NVIC_DisableIRQ(ADC_IRQn);
okini3939 0:de79d4a48e63 38
okini3939 0:de79d4a48e63 39 // Power up the ADC and set PCLK
okini3939 0:de79d4a48e63 40 LPC_SC->PCONP |= (1UL << 12);
okini3939 0:de79d4a48e63 41 LPC_SC->PCLKSEL0 &= ~(3UL << 24); // PCLK = CCLK/4 96M/4 = 24MHz
okini3939 0:de79d4a48e63 42
okini3939 0:de79d4a48e63 43 // Enable the ADC, 12MHz, ADC0.0 & .1
okini3939 0:de79d4a48e63 44 LPC_ADC->ADCR = (1UL << 21) | (1UL << 8) | (3UL << 0);
okini3939 0:de79d4a48e63 45
okini3939 0:de79d4a48e63 46 // Set the pin functions to ADC
okini3939 0:de79d4a48e63 47 LPC_PINCON->PINSEL1 &= ~(3UL << 14); /* P0.23, Mbed p15. */
okini3939 0:de79d4a48e63 48 LPC_PINCON->PINSEL1 |= (1UL << 14);
okini3939 0:de79d4a48e63 49 LPC_PINCON->PINSEL1 &= ~(3UL << 16); /* P0.24, Mbed p16. */
okini3939 0:de79d4a48e63 50 LPC_PINCON->PINSEL1 |= (1UL << 16);
okini3939 0:de79d4a48e63 51
okini3939 0:de79d4a48e63 52 // Setup the serial port to print out results.
okini3939 0:de79d4a48e63 53 pc.baud(115200);
okini3939 0:de79d4a48e63 54 pc.printf("ADC with DMA example\n");
okini3939 0:de79d4a48e63 55 pc.printf("====================\n");
okini3939 0:de79d4a48e63 56
okini3939 0:de79d4a48e63 57 // Prepare an ADC configuration.
okini3939 0:de79d4a48e63 58 MODDMA_Config *conf = new MODDMA_Config;
okini3939 0:de79d4a48e63 59 conf
okini3939 0:de79d4a48e63 60 ->channelNum ( MODDMA::Channel_0 )
okini3939 0:de79d4a48e63 61 ->srcMemAddr ( 0 )
okini3939 0:de79d4a48e63 62 ->dstMemAddr ( (uint32_t)adcInputBuffer )
okini3939 0:de79d4a48e63 63 ->transferSize ( SAMPLE_BUFFER_LENGTH )
okini3939 0:de79d4a48e63 64 ->transferType ( MODDMA::p2m )
okini3939 0:de79d4a48e63 65 ->transferWidth ( MODDMA::word )
okini3939 0:de79d4a48e63 66 ->srcConn ( MODDMA::ADC )
okini3939 0:de79d4a48e63 67 ->dstConn ( 0 )
okini3939 0:de79d4a48e63 68 ->dmaLLI ( 0 )
okini3939 0:de79d4a48e63 69 ->attach_tc ( &TC0_callback )
okini3939 0:de79d4a48e63 70 ->attach_err ( &ERR0_callback )
okini3939 0:de79d4a48e63 71 ; // end conf.
okini3939 0:de79d4a48e63 72
okini3939 0:de79d4a48e63 73 // Prepare configuration.
okini3939 0:de79d4a48e63 74 dma.Setup( conf );
okini3939 0:de79d4a48e63 75
okini3939 0:de79d4a48e63 76 // Enable configuration.
okini3939 0:de79d4a48e63 77 dma.Enable( conf );
okini3939 0:de79d4a48e63 78
okini3939 0:de79d4a48e63 79 // Enable ADC irq flag (to DMA).
okini3939 0:de79d4a48e63 80 // Note, don't set the individual flags,
okini3939 0:de79d4a48e63 81 // just set the global flag.
okini3939 0:de79d4a48e63 82 LPC_ADC->ADINTEN = 0x100;
okini3939 0:de79d4a48e63 83
okini3939 0:de79d4a48e63 84 // Enable burst mode on inputs 0 and 1.
okini3939 0:de79d4a48e63 85 LPC_ADC->ADCR |= (1UL << 16);
okini3939 0:de79d4a48e63 86
okini3939 0:de79d4a48e63 87 while (1) {
okini3939 0:de79d4a48e63 88 // When transfer complete do this block.
okini3939 0:de79d4a48e63 89 if (dmaTransferComplete) {
okini3939 0:de79d4a48e63 90 delete conf; // No memory leaks, delete the configuration.
okini3939 0:de79d4a48e63 91 dmaTransferComplete = false;
okini3939 0:de79d4a48e63 92 for (int i = 0; i < SAMPLE_BUFFER_LENGTH; i++) {
okini3939 0:de79d4a48e63 93 int channel = (adcInputBuffer[i] >> 24) & 0x7;
okini3939 0:de79d4a48e63 94 int iVal = (adcInputBuffer[i] >> 4) & 0xFFF;
okini3939 0:de79d4a48e63 95 double fVal = 3.3 * (double)((double)iVal) / ((double)0x1000); // scale to 0v to 3.3v
okini3939 0:de79d4a48e63 96 pc.printf("Array index %02d : ADC input channel %d = 0x%03x %01.3f volts\n", i, channel, iVal, fVal);
okini3939 0:de79d4a48e63 97 }
okini3939 0:de79d4a48e63 98 }
okini3939 0:de79d4a48e63 99
okini3939 0:de79d4a48e63 100 // Just flash LED1 for something to do.
okini3939 0:de79d4a48e63 101 led1 = !led1;
okini3939 0:de79d4a48e63 102 wait(0.25);
okini3939 0:de79d4a48e63 103 }
okini3939 0:de79d4a48e63 104 }
okini3939 0:de79d4a48e63 105
okini3939 0:de79d4a48e63 106 // Configuration callback on TC
okini3939 0:de79d4a48e63 107 void TC0_callback(void) {
okini3939 0:de79d4a48e63 108
okini3939 0:de79d4a48e63 109 MODDMA_Config *config = dma.getConfig();
okini3939 0:de79d4a48e63 110
okini3939 0:de79d4a48e63 111 // Disbale burst mode and switch off the IRQ flag.
okini3939 0:de79d4a48e63 112 LPC_ADC->ADCR &= ~(1UL << 16);
okini3939 0:de79d4a48e63 113 LPC_ADC->ADINTEN = 0;
okini3939 0:de79d4a48e63 114
okini3939 0:de79d4a48e63 115 // Finish the DMA cycle by shutting down the channel.
okini3939 0:de79d4a48e63 116 dma.haltAndWaitChannelComplete( (MODDMA::CHANNELS)config->channelNum());
okini3939 0:de79d4a48e63 117 dma.Disable( (MODDMA::CHANNELS)config->channelNum() );
okini3939 0:de79d4a48e63 118
okini3939 0:de79d4a48e63 119 // Tell main() while(1) loop to print the results.
okini3939 0:de79d4a48e63 120 dmaTransferComplete = true;
okini3939 0:de79d4a48e63 121
okini3939 0:de79d4a48e63 122 // Switch on LED2 to show transfer complete.
okini3939 0:de79d4a48e63 123 led2 = 1;
okini3939 0:de79d4a48e63 124
okini3939 0:de79d4a48e63 125 // Clear DMA IRQ flags.
okini3939 0:de79d4a48e63 126 if (dma.irqType() == MODDMA::TcIrq) dma.clearTcIrq();
okini3939 0:de79d4a48e63 127 if (dma.irqType() == MODDMA::ErrIrq) dma.clearErrIrq();
okini3939 0:de79d4a48e63 128 }
okini3939 0:de79d4a48e63 129
okini3939 0:de79d4a48e63 130 // Configuration callback on Error
okini3939 0:de79d4a48e63 131 void ERR0_callback(void) {
okini3939 0:de79d4a48e63 132 // Switch off burst conversions.
okini3939 0:de79d4a48e63 133 LPC_ADC->ADCR |= ~(1UL << 16);
okini3939 0:de79d4a48e63 134 LPC_ADC->ADINTEN = 0;
okini3939 0:de79d4a48e63 135 error("Oh no! My Mbed EXPLODED! :( Only kidding, go find the problem");
okini3939 0:de79d4a48e63 136 }
okini3939 0:de79d4a48e63 137