Hideharu Tsunemoto / Mbed 2 deprecated MBED_TestPulse_Xray_Cont_20180517

MBED_LPC1768_Test Pulse msec/usec Interval Output P29/P30 & Input P21 Status Send USB Serial Log

Dependencies:   mbed

MODDMA/example2.h@0:47c1b6a0c166, 2018-05-29 (annotated)

Committer:
H_Tsunemoto
Date:
Tue May 29 02:41:54 2018 +0000
Revision:
0:47c1b6a0c166
Pulse On/OFF OutPut P29/P30 & Rep Input P21 Status Output USBSerial;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
H_Tsunemoto 0:47c1b6a0c166 1 /*
H_Tsunemoto 0:47c1b6a0c166 2 * This example was provided to support Mbed forum thread:-
H_Tsunemoto 0:47c1b6a0c166 3 * http://mbed.org/forum/mbed/topic/1798
H_Tsunemoto 0:47c1b6a0c166 4 */
H_Tsunemoto 0:47c1b6a0c166 5
H_Tsunemoto 0:47c1b6a0c166 6 #include "mbed.h"
H_Tsunemoto 0:47c1b6a0c166 7 #include "MODDMA.h"
H_Tsunemoto 0:47c1b6a0c166 8
H_Tsunemoto 0:47c1b6a0c166 9 #define SAMPLE_BUFFER_LENGTH 32
H_Tsunemoto 0:47c1b6a0c166 10
H_Tsunemoto 0:47c1b6a0c166 11 DigitalOut led1(LED1);
H_Tsunemoto 0:47c1b6a0c166 12 DigitalOut led2(LED2);
H_Tsunemoto 0:47c1b6a0c166 13
H_Tsunemoto 0:47c1b6a0c166 14 MODDMA dma;
H_Tsunemoto 0:47c1b6a0c166 15 Serial pc(USBTX, USBRX);
H_Tsunemoto 0:47c1b6a0c166 16
H_Tsunemoto 0:47c1b6a0c166 17 // ISR set's this when transfer complete.
H_Tsunemoto 0:47c1b6a0c166 18 bool dmaTransferComplete = false;
H_Tsunemoto 0:47c1b6a0c166 19
H_Tsunemoto 0:47c1b6a0c166 20 // Function prototypes for IRQ callbacks.
H_Tsunemoto 0:47c1b6a0c166 21 // See definitions following main() below.
H_Tsunemoto 0:47c1b6a0c166 22 void TC0_callback(void);
H_Tsunemoto 0:47c1b6a0c166 23 void ERR0_callback(void);
H_Tsunemoto 0:47c1b6a0c166 24
H_Tsunemoto 0:47c1b6a0c166 25 int main() {
H_Tsunemoto 0:47c1b6a0c166 26
H_Tsunemoto 0:47c1b6a0c166 27 // Create a buffer to hold the ADC samples and clear it.
H_Tsunemoto 0:47c1b6a0c166 28 // Note, we are going to sample two ADC inputs so they
H_Tsunemoto 0:47c1b6a0c166 29 // end up in this buffer "interleaved". So you will want
H_Tsunemoto 0:47c1b6a0c166 30 // a buffer twice this size to a real life given sample
H_Tsunemoto 0:47c1b6a0c166 31 // frequency. See the printf() output for details.
H_Tsunemoto 0:47c1b6a0c166 32 uint32_t adcInputBuffer[SAMPLE_BUFFER_LENGTH];
H_Tsunemoto 0:47c1b6a0c166 33 memset(adcInputBuffer, 0, sizeof(adcInputBuffer));
H_Tsunemoto 0:47c1b6a0c166 34
H_Tsunemoto 0:47c1b6a0c166 35 // We use the ADC irq to trigger DMA and the manual says
H_Tsunemoto 0:47c1b6a0c166 36 // that in this case the NVIC for ADC must be disabled.
H_Tsunemoto 0:47c1b6a0c166 37 NVIC_DisableIRQ(ADC_IRQn);
H_Tsunemoto 0:47c1b6a0c166 38
H_Tsunemoto 0:47c1b6a0c166 39 // Power up the ADC and set PCLK
H_Tsunemoto 0:47c1b6a0c166 40 LPC_SC->PCONP |= (1UL << 12);
H_Tsunemoto 0:47c1b6a0c166 41 LPC_SC->PCLKSEL0 &= ~(3UL << 24); // PCLK = CCLK/4 96M/4 = 24MHz
H_Tsunemoto 0:47c1b6a0c166 42
H_Tsunemoto 0:47c1b6a0c166 43 // Enable the ADC, 12MHz, ADC0.0 & .1
H_Tsunemoto 0:47c1b6a0c166 44 LPC_ADC->ADCR = (1UL << 21) | (1UL << 8) | (3UL << 0);
H_Tsunemoto 0:47c1b6a0c166 45
H_Tsunemoto 0:47c1b6a0c166 46 // Set the pin functions to ADC
H_Tsunemoto 0:47c1b6a0c166 47 LPC_PINCON->PINSEL1 &= ~(3UL << 14); /* P0.23, Mbed p15. */
H_Tsunemoto 0:47c1b6a0c166 48 LPC_PINCON->PINSEL1 |= (1UL << 14);
H_Tsunemoto 0:47c1b6a0c166 49 LPC_PINCON->PINSEL1 &= ~(3UL << 16); /* P0.24, Mbed p16. */
H_Tsunemoto 0:47c1b6a0c166 50 LPC_PINCON->PINSEL1 |= (1UL << 16);
H_Tsunemoto 0:47c1b6a0c166 51
H_Tsunemoto 0:47c1b6a0c166 52 // Setup the serial port to print out results.
H_Tsunemoto 0:47c1b6a0c166 53 pc.baud(115200);
H_Tsunemoto 0:47c1b6a0c166 54 pc.printf("ADC with DMA example\n");
H_Tsunemoto 0:47c1b6a0c166 55 pc.printf("====================\n");
H_Tsunemoto 0:47c1b6a0c166 56
H_Tsunemoto 0:47c1b6a0c166 57 // Prepare an ADC configuration.
H_Tsunemoto 0:47c1b6a0c166 58 MODDMA_Config *conf = new MODDMA_Config;
H_Tsunemoto 0:47c1b6a0c166 59 conf
H_Tsunemoto 0:47c1b6a0c166 60 ->channelNum ( MODDMA::Channel_0 )
H_Tsunemoto 0:47c1b6a0c166 61 ->srcMemAddr ( 0 )
H_Tsunemoto 0:47c1b6a0c166 62 ->dstMemAddr ( (uint32_t)adcInputBuffer )
H_Tsunemoto 0:47c1b6a0c166 63 ->transferSize ( SAMPLE_BUFFER_LENGTH )
H_Tsunemoto 0:47c1b6a0c166 64 ->transferType ( MODDMA::p2m )
H_Tsunemoto 0:47c1b6a0c166 65 ->transferWidth ( MODDMA::word )
H_Tsunemoto 0:47c1b6a0c166 66 ->srcConn ( MODDMA::ADC )
H_Tsunemoto 0:47c1b6a0c166 67 ->dstConn ( 0 )
H_Tsunemoto 0:47c1b6a0c166 68 ->dmaLLI ( 0 )
H_Tsunemoto 0:47c1b6a0c166 69 ->attach_tc ( &TC0_callback )
H_Tsunemoto 0:47c1b6a0c166 70 ->attach_err ( &ERR0_callback )
H_Tsunemoto 0:47c1b6a0c166 71 ; // end conf.
H_Tsunemoto 0:47c1b6a0c166 72
H_Tsunemoto 0:47c1b6a0c166 73 // Prepare configuration.
H_Tsunemoto 0:47c1b6a0c166 74 dma.Setup( conf );
H_Tsunemoto 0:47c1b6a0c166 75
H_Tsunemoto 0:47c1b6a0c166 76 // Enable configuration.
H_Tsunemoto 0:47c1b6a0c166 77 dma.Enable( conf );
H_Tsunemoto 0:47c1b6a0c166 78
H_Tsunemoto 0:47c1b6a0c166 79 // Enable ADC irq flag (to DMA).
H_Tsunemoto 0:47c1b6a0c166 80 // Note, don't set the individual flags,
H_Tsunemoto 0:47c1b6a0c166 81 // just set the global flag.
H_Tsunemoto 0:47c1b6a0c166 82 LPC_ADC->ADINTEN = 0x100;
H_Tsunemoto 0:47c1b6a0c166 83
H_Tsunemoto 0:47c1b6a0c166 84 // Enable burst mode on inputs 0 and 1.
H_Tsunemoto 0:47c1b6a0c166 85 LPC_ADC->ADCR |= (1UL << 16);
H_Tsunemoto 0:47c1b6a0c166 86
H_Tsunemoto 0:47c1b6a0c166 87 while (1) {
H_Tsunemoto 0:47c1b6a0c166 88 // When transfer complete do this block.
H_Tsunemoto 0:47c1b6a0c166 89 if (dmaTransferComplete) {
H_Tsunemoto 0:47c1b6a0c166 90 delete conf; // No memory leaks, delete the configuration.
H_Tsunemoto 0:47c1b6a0c166 91 dmaTransferComplete = false;
H_Tsunemoto 0:47c1b6a0c166 92 for (int i = 0; i < SAMPLE_BUFFER_LENGTH; i++) {
H_Tsunemoto 0:47c1b6a0c166 93 int channel = (adcInputBuffer[i] >> 24) & 0x7;
H_Tsunemoto 0:47c1b6a0c166 94 int iVal = (adcInputBuffer[i] >> 4) & 0xFFF;
H_Tsunemoto 0:47c1b6a0c166 95 double fVal = 3.3 * (double)((double)iVal) / ((double)0x1000); // scale to 0v to 3.3v
H_Tsunemoto 0:47c1b6a0c166 96 pc.printf("Array index %02d : ADC input channel %d = 0x%03x %01.3f volts\n", i, channel, iVal, fVal);
H_Tsunemoto 0:47c1b6a0c166 97 }
H_Tsunemoto 0:47c1b6a0c166 98 }
H_Tsunemoto 0:47c1b6a0c166 99
H_Tsunemoto 0:47c1b6a0c166 100 // Just flash LED1 for something to do.
H_Tsunemoto 0:47c1b6a0c166 101 led1 = !led1;
H_Tsunemoto 0:47c1b6a0c166 102 wait(0.25);
H_Tsunemoto 0:47c1b6a0c166 103 }
H_Tsunemoto 0:47c1b6a0c166 104 }
H_Tsunemoto 0:47c1b6a0c166 105
H_Tsunemoto 0:47c1b6a0c166 106 // Configuration callback on TC
H_Tsunemoto 0:47c1b6a0c166 107 void TC0_callback(void) {
H_Tsunemoto 0:47c1b6a0c166 108
H_Tsunemoto 0:47c1b6a0c166 109 MODDMA_Config *config = dma.getConfig();
H_Tsunemoto 0:47c1b6a0c166 110
H_Tsunemoto 0:47c1b6a0c166 111 // Disbale burst mode and switch off the IRQ flag.
H_Tsunemoto 0:47c1b6a0c166 112 LPC_ADC->ADCR &= ~(1UL << 16);
H_Tsunemoto 0:47c1b6a0c166 113 LPC_ADC->ADINTEN = 0;
H_Tsunemoto 0:47c1b6a0c166 114
H_Tsunemoto 0:47c1b6a0c166 115 // Finish the DMA cycle by shutting down the channel.
H_Tsunemoto 0:47c1b6a0c166 116 dma.haltAndWaitChannelComplete( (MODDMA::CHANNELS)config->channelNum());
H_Tsunemoto 0:47c1b6a0c166 117 dma.Disable( (MODDMA::CHANNELS)config->channelNum() );
H_Tsunemoto 0:47c1b6a0c166 118
H_Tsunemoto 0:47c1b6a0c166 119 // Tell main() while(1) loop to print the results.
H_Tsunemoto 0:47c1b6a0c166 120 dmaTransferComplete = true;
H_Tsunemoto 0:47c1b6a0c166 121
H_Tsunemoto 0:47c1b6a0c166 122 // Switch on LED2 to show transfer complete.
H_Tsunemoto 0:47c1b6a0c166 123 led2 = 1;
H_Tsunemoto 0:47c1b6a0c166 124
H_Tsunemoto 0:47c1b6a0c166 125 // Clear DMA IRQ flags.
H_Tsunemoto 0:47c1b6a0c166 126 if (dma.irqType() == MODDMA::TcIrq) dma.clearTcIrq();
H_Tsunemoto 0:47c1b6a0c166 127 if (dma.irqType() == MODDMA::ErrIrq) dma.clearErrIrq();
H_Tsunemoto 0:47c1b6a0c166 128 }
H_Tsunemoto 0:47c1b6a0c166 129
H_Tsunemoto 0:47c1b6a0c166 130 // Configuration callback on Error
H_Tsunemoto 0:47c1b6a0c166 131 void ERR0_callback(void) {
H_Tsunemoto 0:47c1b6a0c166 132 // Switch off burst conversions.
H_Tsunemoto 0:47c1b6a0c166 133 LPC_ADC->ADCR |= ~(1UL << 16);
H_Tsunemoto 0:47c1b6a0c166 134 LPC_ADC->ADINTEN = 0;
H_Tsunemoto 0:47c1b6a0c166 135 error("Oh no! My Mbed EXPLODED! :( Only kidding, go find the problem");
H_Tsunemoto 0:47c1b6a0c166 136 }
H_Tsunemoto 0:47c1b6a0c166 137