Suga koubou / Mbed 2 deprecated SPIRAM_23LC1024_DMA

SPI RAM 23LC1024 (Microchip) with DMA

Dependencies:   mbed

Fork of SPIRAM_23LC1024 by Suga koubou

MODDMA/example2.h@2:a3e0f7f37ac9, 2012-12-05 (annotated)

Committer:
okini3939
Date:
Wed Dec 05 07:56:09 2012 +0000
Revision:
2:a3e0f7f37ac9
DMX

Who changed what in which revision?

UserRevisionLine numberNew contents of line
okini3939 2:a3e0f7f37ac9 1 /*
okini3939 2:a3e0f7f37ac9 2 * This example was provided to support Mbed forum thread:-
okini3939 2:a3e0f7f37ac9 3 * http://mbed.org/forum/mbed/topic/1798
okini3939 2:a3e0f7f37ac9 4 */
okini3939 2:a3e0f7f37ac9 5
okini3939 2:a3e0f7f37ac9 6 #include "mbed.h"
okini3939 2:a3e0f7f37ac9 7 #include "MODDMA.h"
okini3939 2:a3e0f7f37ac9 8
okini3939 2:a3e0f7f37ac9 9 #define SAMPLE_BUFFER_LENGTH 32
okini3939 2:a3e0f7f37ac9 10
okini3939 2:a3e0f7f37ac9 11 DigitalOut led1(LED1);
okini3939 2:a3e0f7f37ac9 12 DigitalOut led2(LED2);
okini3939 2:a3e0f7f37ac9 13
okini3939 2:a3e0f7f37ac9 14 MODDMA dma;
okini3939 2:a3e0f7f37ac9 15 Serial pc(USBTX, USBRX);
okini3939 2:a3e0f7f37ac9 16
okini3939 2:a3e0f7f37ac9 17 // ISR set's this when transfer complete.
okini3939 2:a3e0f7f37ac9 18 bool dmaTransferComplete = false;
okini3939 2:a3e0f7f37ac9 19
okini3939 2:a3e0f7f37ac9 20 // Function prototypes for IRQ callbacks.
okini3939 2:a3e0f7f37ac9 21 // See definitions following main() below.
okini3939 2:a3e0f7f37ac9 22 void TC0_callback(void);
okini3939 2:a3e0f7f37ac9 23 void ERR0_callback(void);
okini3939 2:a3e0f7f37ac9 24
okini3939 2:a3e0f7f37ac9 25 int main() {
okini3939 2:a3e0f7f37ac9 26
okini3939 2:a3e0f7f37ac9 27 // Create a buffer to hold the ADC samples and clear it.
okini3939 2:a3e0f7f37ac9 28 // Note, we are going to sample two ADC inputs so they
okini3939 2:a3e0f7f37ac9 29 // end up in this buffer "interleaved". So you will want
okini3939 2:a3e0f7f37ac9 30 // a buffer twice this size to a real life given sample
okini3939 2:a3e0f7f37ac9 31 // frequency. See the printf() output for details.
okini3939 2:a3e0f7f37ac9 32 uint32_t adcInputBuffer[SAMPLE_BUFFER_LENGTH];
okini3939 2:a3e0f7f37ac9 33 memset(adcInputBuffer, 0, sizeof(adcInputBuffer));
okini3939 2:a3e0f7f37ac9 34
okini3939 2:a3e0f7f37ac9 35 // We use the ADC irq to trigger DMA and the manual says
okini3939 2:a3e0f7f37ac9 36 // that in this case the NVIC for ADC must be disabled.
okini3939 2:a3e0f7f37ac9 37 NVIC_DisableIRQ(ADC_IRQn);
okini3939 2:a3e0f7f37ac9 38
okini3939 2:a3e0f7f37ac9 39 // Power up the ADC and set PCLK
okini3939 2:a3e0f7f37ac9 40 LPC_SC->PCONP |= (1UL << 12);
okini3939 2:a3e0f7f37ac9 41 LPC_SC->PCLKSEL0 &= ~(3UL << 24); // PCLK = CCLK/4 96M/4 = 24MHz
okini3939 2:a3e0f7f37ac9 42
okini3939 2:a3e0f7f37ac9 43 // Enable the ADC, 12MHz, ADC0.0 & .1
okini3939 2:a3e0f7f37ac9 44 LPC_ADC->ADCR = (1UL << 21) | (1UL << 8) | (3UL << 0);
okini3939 2:a3e0f7f37ac9 45
okini3939 2:a3e0f7f37ac9 46 // Set the pin functions to ADC
okini3939 2:a3e0f7f37ac9 47 LPC_PINCON->PINSEL1 &= ~(3UL << 14); /* P0.23, Mbed p15. */
okini3939 2:a3e0f7f37ac9 48 LPC_PINCON->PINSEL1 |= (1UL << 14);
okini3939 2:a3e0f7f37ac9 49 LPC_PINCON->PINSEL1 &= ~(3UL << 16); /* P0.24, Mbed p16. */
okini3939 2:a3e0f7f37ac9 50 LPC_PINCON->PINSEL1 |= (1UL << 16);
okini3939 2:a3e0f7f37ac9 51
okini3939 2:a3e0f7f37ac9 52 // Setup the serial port to print out results.
okini3939 2:a3e0f7f37ac9 53 pc.baud(115200);
okini3939 2:a3e0f7f37ac9 54 pc.printf("ADC with DMA example\n");
okini3939 2:a3e0f7f37ac9 55 pc.printf("====================\n");
okini3939 2:a3e0f7f37ac9 56
okini3939 2:a3e0f7f37ac9 57 // Prepare an ADC configuration.
okini3939 2:a3e0f7f37ac9 58 MODDMA_Config *conf = new MODDMA_Config;
okini3939 2:a3e0f7f37ac9 59 conf
okini3939 2:a3e0f7f37ac9 60 ->channelNum ( MODDMA::Channel_0 )
okini3939 2:a3e0f7f37ac9 61 ->srcMemAddr ( 0 )
okini3939 2:a3e0f7f37ac9 62 ->dstMemAddr ( (uint32_t)adcInputBuffer )
okini3939 2:a3e0f7f37ac9 63 ->transferSize ( SAMPLE_BUFFER_LENGTH )
okini3939 2:a3e0f7f37ac9 64 ->transferType ( MODDMA::p2m )
okini3939 2:a3e0f7f37ac9 65 ->transferWidth ( MODDMA::word )
okini3939 2:a3e0f7f37ac9 66 ->srcConn ( MODDMA::ADC )
okini3939 2:a3e0f7f37ac9 67 ->dstConn ( 0 )
okini3939 2:a3e0f7f37ac9 68 ->dmaLLI ( 0 )
okini3939 2:a3e0f7f37ac9 69 ->attach_tc ( &TC0_callback )
okini3939 2:a3e0f7f37ac9 70 ->attach_err ( &ERR0_callback )
okini3939 2:a3e0f7f37ac9 71 ; // end conf.
okini3939 2:a3e0f7f37ac9 72
okini3939 2:a3e0f7f37ac9 73 // Prepare configuration.
okini3939 2:a3e0f7f37ac9 74 dma.Setup( conf );
okini3939 2:a3e0f7f37ac9 75
okini3939 2:a3e0f7f37ac9 76 // Enable configuration.
okini3939 2:a3e0f7f37ac9 77 dma.Enable( conf );
okini3939 2:a3e0f7f37ac9 78
okini3939 2:a3e0f7f37ac9 79 // Enable ADC irq flag (to DMA).
okini3939 2:a3e0f7f37ac9 80 // Note, don't set the individual flags,
okini3939 2:a3e0f7f37ac9 81 // just set the global flag.
okini3939 2:a3e0f7f37ac9 82 LPC_ADC->ADINTEN = 0x100;
okini3939 2:a3e0f7f37ac9 83
okini3939 2:a3e0f7f37ac9 84 // Enable burst mode on inputs 0 and 1.
okini3939 2:a3e0f7f37ac9 85 LPC_ADC->ADCR |= (1UL << 16);
okini3939 2:a3e0f7f37ac9 86
okini3939 2:a3e0f7f37ac9 87 while (1) {
okini3939 2:a3e0f7f37ac9 88 // When transfer complete do this block.
okini3939 2:a3e0f7f37ac9 89 if (dmaTransferComplete) {
okini3939 2:a3e0f7f37ac9 90 delete conf; // No memory leaks, delete the configuration.
okini3939 2:a3e0f7f37ac9 91 dmaTransferComplete = false;
okini3939 2:a3e0f7f37ac9 92 for (int i = 0; i < SAMPLE_BUFFER_LENGTH; i++) {
okini3939 2:a3e0f7f37ac9 93 int channel = (adcInputBuffer[i] >> 24) & 0x7;
okini3939 2:a3e0f7f37ac9 94 int iVal = (adcInputBuffer[i] >> 4) & 0xFFF;
okini3939 2:a3e0f7f37ac9 95 double fVal = 3.3 * (double)((double)iVal) / ((double)0x1000); // scale to 0v to 3.3v
okini3939 2:a3e0f7f37ac9 96 pc.printf("Array index %02d : ADC input channel %d = 0x%03x %01.3f volts\n", i, channel, iVal, fVal);
okini3939 2:a3e0f7f37ac9 97 }
okini3939 2:a3e0f7f37ac9 98 }
okini3939 2:a3e0f7f37ac9 99
okini3939 2:a3e0f7f37ac9 100 // Just flash LED1 for something to do.
okini3939 2:a3e0f7f37ac9 101 led1 = !led1;
okini3939 2:a3e0f7f37ac9 102 wait(0.25);
okini3939 2:a3e0f7f37ac9 103 }
okini3939 2:a3e0f7f37ac9 104 }
okini3939 2:a3e0f7f37ac9 105
okini3939 2:a3e0f7f37ac9 106 // Configuration callback on TC
okini3939 2:a3e0f7f37ac9 107 void TC0_callback(void) {
okini3939 2:a3e0f7f37ac9 108
okini3939 2:a3e0f7f37ac9 109 MODDMA_Config *config = dma.getConfig();
okini3939 2:a3e0f7f37ac9 110
okini3939 2:a3e0f7f37ac9 111 // Disbale burst mode and switch off the IRQ flag.
okini3939 2:a3e0f7f37ac9 112 LPC_ADC->ADCR &= ~(1UL << 16);
okini3939 2:a3e0f7f37ac9 113 LPC_ADC->ADINTEN = 0;
okini3939 2:a3e0f7f37ac9 114
okini3939 2:a3e0f7f37ac9 115 // Finish the DMA cycle by shutting down the channel.
okini3939 2:a3e0f7f37ac9 116 dma.haltAndWaitChannelComplete( (MODDMA::CHANNELS)config->channelNum());
okini3939 2:a3e0f7f37ac9 117 dma.Disable( (MODDMA::CHANNELS)config->channelNum() );
okini3939 2:a3e0f7f37ac9 118
okini3939 2:a3e0f7f37ac9 119 // Tell main() while(1) loop to print the results.
okini3939 2:a3e0f7f37ac9 120 dmaTransferComplete = true;
okini3939 2:a3e0f7f37ac9 121
okini3939 2:a3e0f7f37ac9 122 // Switch on LED2 to show transfer complete.
okini3939 2:a3e0f7f37ac9 123 led2 = 1;
okini3939 2:a3e0f7f37ac9 124
okini3939 2:a3e0f7f37ac9 125 // Clear DMA IRQ flags.
okini3939 2:a3e0f7f37ac9 126 if (dma.irqType() == MODDMA::TcIrq) dma.clearTcIrq();
okini3939 2:a3e0f7f37ac9 127 if (dma.irqType() == MODDMA::ErrIrq) dma.clearErrIrq();
okini3939 2:a3e0f7f37ac9 128 }
okini3939 2:a3e0f7f37ac9 129
okini3939 2:a3e0f7f37ac9 130 // Configuration callback on Error
okini3939 2:a3e0f7f37ac9 131 void ERR0_callback(void) {
okini3939 2:a3e0f7f37ac9 132 // Switch off burst conversions.
okini3939 2:a3e0f7f37ac9 133 LPC_ADC->ADCR |= ~(1UL << 16);
okini3939 2:a3e0f7f37ac9 134 LPC_ADC->ADINTEN = 0;
okini3939 2:a3e0f7f37ac9 135 error("Oh no! My Mbed EXPLODED! :( Only kidding, go find the problem");
okini3939 2:a3e0f7f37ac9 136 }
okini3939 2:a3e0f7f37ac9 137