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/example3.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 * Demonstrates capturing the GPIO P0.4 to P0.7 "nibble" to memory
H_Tsunemoto 0:47c1b6a0c166 3 * using GPDMA. The transfers from port pins to memory buffer are
H_Tsunemoto 0:47c1b6a0c166 4 * triggered using Timer1 MAT1.0 match compare.
H_Tsunemoto 0:47c1b6a0c166 5 *
H_Tsunemoto 0:47c1b6a0c166 6 * In this example all inputs have pullups. So with nothing connected
H_Tsunemoto 0:47c1b6a0c166 7 * the P0.4/7 reads as 0xF. Connecting a wire from one or more of the four
H_Tsunemoto 0:47c1b6a0c166 8 * inputs to ground will show up in the captured buffer sequence.
H_Tsunemoto 0:47c1b6a0c166 9 */
H_Tsunemoto 0:47c1b6a0c166 10
H_Tsunemoto 0:47c1b6a0c166 11 #include "mbed.h"
H_Tsunemoto 0:47c1b6a0c166 12 #include "MODDMA.h"
H_Tsunemoto 0:47c1b6a0c166 13 #include "iomacros.h" // within MODDMA library.
H_Tsunemoto 0:47c1b6a0c166 14
H_Tsunemoto 0:47c1b6a0c166 15 // How long between grabbing GPIO FIO0PIN register.
H_Tsunemoto 0:47c1b6a0c166 16 // Value is in microseconds. (500000 is half a second).
H_Tsunemoto 0:47c1b6a0c166 17 #define SAMPLE_PERIOD 500000
H_Tsunemoto 0:47c1b6a0c166 18
H_Tsunemoto 0:47c1b6a0c166 19 #define NUM_OF_SAMPLES 5
H_Tsunemoto 0:47c1b6a0c166 20
H_Tsunemoto 0:47c1b6a0c166 21 Serial pc(USBTX, USBRX);
H_Tsunemoto 0:47c1b6a0c166 22
H_Tsunemoto 0:47c1b6a0c166 23 DigitalOut led1(LED1);
H_Tsunemoto 0:47c1b6a0c166 24 DigitalOut led2(LED2);
H_Tsunemoto 0:47c1b6a0c166 25 DigitalOut led3(LED3);
H_Tsunemoto 0:47c1b6a0c166 26
H_Tsunemoto 0:47c1b6a0c166 27 uint32_t buffer[NUM_OF_SAMPLES];
H_Tsunemoto 0:47c1b6a0c166 28
H_Tsunemoto 0:47c1b6a0c166 29 bool dmaTransferComplete;
H_Tsunemoto 0:47c1b6a0c166 30
H_Tsunemoto 0:47c1b6a0c166 31 MODDMA dma;
H_Tsunemoto 0:47c1b6a0c166 32 MODDMA_Config *conf;
H_Tsunemoto 0:47c1b6a0c166 33
H_Tsunemoto 0:47c1b6a0c166 34 void TC0_callback(void);
H_Tsunemoto 0:47c1b6a0c166 35 void ERR0_callback(void);
H_Tsunemoto 0:47c1b6a0c166 36
H_Tsunemoto 0:47c1b6a0c166 37 int main() {
H_Tsunemoto 0:47c1b6a0c166 38 volatile int life_counter = 0;
H_Tsunemoto 0:47c1b6a0c166 39
H_Tsunemoto 0:47c1b6a0c166 40 // Macros defined in iomacros.h, saves messing with DigitalIn
H_Tsunemoto 0:47c1b6a0c166 41 p30_AS_INPUT; p30_MODE( PIN_PULLUP ); // P0.4
H_Tsunemoto 0:47c1b6a0c166 42 p29_AS_INPUT; p29_MODE( PIN_PULLUP ); // P0.5
H_Tsunemoto 0:47c1b6a0c166 43 p8_AS_INPUT; p8_MODE( PIN_PULLUP ); // P0.6
H_Tsunemoto 0:47c1b6a0c166 44 p7_AS_INPUT; p7_MODE( PIN_PULLUP ); // P0.7
H_Tsunemoto 0:47c1b6a0c166 45
H_Tsunemoto 0:47c1b6a0c166 46 // Clear the buffer.
H_Tsunemoto 0:47c1b6a0c166 47 memset(buffer, 0, sizeof(buffer));
H_Tsunemoto 0:47c1b6a0c166 48
H_Tsunemoto 0:47c1b6a0c166 49 // Setup the serial port to print out results.
H_Tsunemoto 0:47c1b6a0c166 50 pc.baud(115200);
H_Tsunemoto 0:47c1b6a0c166 51 pc.printf("Starting up...\n");
H_Tsunemoto 0:47c1b6a0c166 52
H_Tsunemoto 0:47c1b6a0c166 53 // Set-up timer1 as a periodic timer.
H_Tsunemoto 0:47c1b6a0c166 54 LPC_SC->PCONP |= (1UL << 2); // TIM1 On
H_Tsunemoto 0:47c1b6a0c166 55 LPC_SC->PCLKSEL0 |= (3UL << 4); // CCLK/8 = 12MHz
H_Tsunemoto 0:47c1b6a0c166 56 LPC_TIM1->PR = 11; // TC clocks at 1MHz.
H_Tsunemoto 0:47c1b6a0c166 57 LPC_TIM1->MCR = 2; // Reset TCR to zero on match.
H_Tsunemoto 0:47c1b6a0c166 58 LPC_TIM1->MR0 = SAMPLE_PERIOD;
H_Tsunemoto 0:47c1b6a0c166 59
H_Tsunemoto 0:47c1b6a0c166 60 // Prepare the GPDMA system.
H_Tsunemoto 0:47c1b6a0c166 61 conf = new MODDMA_Config;
H_Tsunemoto 0:47c1b6a0c166 62 conf
H_Tsunemoto 0:47c1b6a0c166 63 ->channelNum ( MODDMA::Channel_0 )
H_Tsunemoto 0:47c1b6a0c166 64 ->srcMemAddr ( (uint32_t)&LPC_GPIO0->FIOPIN )
H_Tsunemoto 0:47c1b6a0c166 65 ->dstMemAddr ( (uint32_t)&buffer[0] )
H_Tsunemoto 0:47c1b6a0c166 66 ->transferSize ( NUM_OF_SAMPLES )
H_Tsunemoto 0:47c1b6a0c166 67 ->transferType ( MODDMA::g2m ) // pseudo transfer code MODDMA understands.
H_Tsunemoto 0:47c1b6a0c166 68 ->transferWidth ( MODDMA::word )
H_Tsunemoto 0:47c1b6a0c166 69 ->srcConn ( MODDMA::MAT1_0 )
H_Tsunemoto 0:47c1b6a0c166 70 ->dmacSync ( MODDMA::MAT1_0 )
H_Tsunemoto 0:47c1b6a0c166 71 ->attach_tc ( TC0_callback )
H_Tsunemoto 0:47c1b6a0c166 72 ->attach_err ( ERR0_callback )
H_Tsunemoto 0:47c1b6a0c166 73 ; // end conf.
H_Tsunemoto 0:47c1b6a0c166 74
H_Tsunemoto 0:47c1b6a0c166 75 // Prepare configuration.
H_Tsunemoto 0:47c1b6a0c166 76 if (!dma.Setup( conf )) {
H_Tsunemoto 0:47c1b6a0c166 77 error("Doh!");
H_Tsunemoto 0:47c1b6a0c166 78 }
H_Tsunemoto 0:47c1b6a0c166 79
H_Tsunemoto 0:47c1b6a0c166 80 // Enable GPDMA to be ready for the TIM1 "ticks".
H_Tsunemoto 0:47c1b6a0c166 81 dma.Enable( conf );
H_Tsunemoto 0:47c1b6a0c166 82
H_Tsunemoto 0:47c1b6a0c166 83 // Begin.
H_Tsunemoto 0:47c1b6a0c166 84 LPC_TIM1->TCR = 1;
H_Tsunemoto 0:47c1b6a0c166 85
H_Tsunemoto 0:47c1b6a0c166 86 while (1) {
H_Tsunemoto 0:47c1b6a0c166 87 if (life_counter++ > 1000000) {
H_Tsunemoto 0:47c1b6a0c166 88 led1 = !led1; // Show some sort of life.
H_Tsunemoto 0:47c1b6a0c166 89 life_counter = 0;
H_Tsunemoto 0:47c1b6a0c166 90 }
H_Tsunemoto 0:47c1b6a0c166 91
H_Tsunemoto 0:47c1b6a0c166 92 if (dmaTransferComplete) {
H_Tsunemoto 0:47c1b6a0c166 93 dmaTransferComplete = false;
H_Tsunemoto 0:47c1b6a0c166 94 for (int i = 0; i < NUM_OF_SAMPLES; i++) {
H_Tsunemoto 0:47c1b6a0c166 95 int val = (buffer[i] >> 4) & 0xF;
H_Tsunemoto 0:47c1b6a0c166 96 pc.printf("Buffer index %d = 0x%x\n", i, val);
H_Tsunemoto 0:47c1b6a0c166 97 }
H_Tsunemoto 0:47c1b6a0c166 98 pc.printf("Done.\n");
H_Tsunemoto 0:47c1b6a0c166 99
H_Tsunemoto 0:47c1b6a0c166 100 // Schedule another grab.
H_Tsunemoto 0:47c1b6a0c166 101 if (dma.Setup( conf )) {
H_Tsunemoto 0:47c1b6a0c166 102 dma.Enable( conf );
H_Tsunemoto 0:47c1b6a0c166 103 }
H_Tsunemoto 0:47c1b6a0c166 104 }
H_Tsunemoto 0:47c1b6a0c166 105 }
H_Tsunemoto 0:47c1b6a0c166 106 }
H_Tsunemoto 0:47c1b6a0c166 107
H_Tsunemoto 0:47c1b6a0c166 108 // Configuration callback on TC
H_Tsunemoto 0:47c1b6a0c166 109 void TC0_callback(void) {
H_Tsunemoto 0:47c1b6a0c166 110
H_Tsunemoto 0:47c1b6a0c166 111 // Just show sample sequence grab complete.
H_Tsunemoto 0:47c1b6a0c166 112 led3 = !led3;
H_Tsunemoto 0:47c1b6a0c166 113
H_Tsunemoto 0:47c1b6a0c166 114 // Get configuration pointer.
H_Tsunemoto 0:47c1b6a0c166 115 MODDMA_Config *config = dma.getConfig();
H_Tsunemoto 0:47c1b6a0c166 116
H_Tsunemoto 0:47c1b6a0c166 117 // Finish the DMA cycle by shutting down the channel.
H_Tsunemoto 0:47c1b6a0c166 118 dma.Disable( (MODDMA::CHANNELS)config->channelNum() );
H_Tsunemoto 0:47c1b6a0c166 119
H_Tsunemoto 0:47c1b6a0c166 120 // Tell main() while(1) loop to print the results.
H_Tsunemoto 0:47c1b6a0c166 121 dmaTransferComplete = true;
H_Tsunemoto 0:47c1b6a0c166 122
H_Tsunemoto 0:47c1b6a0c166 123 // Clear DMA IRQ flags.
H_Tsunemoto 0:47c1b6a0c166 124 if (dma.irqType() == MODDMA::TcIrq) dma.clearTcIrq();
H_Tsunemoto 0:47c1b6a0c166 125 if (dma.irqType() == MODDMA::ErrIrq) dma.clearErrIrq();
H_Tsunemoto 0:47c1b6a0c166 126 }
H_Tsunemoto 0:47c1b6a0c166 127
H_Tsunemoto 0:47c1b6a0c166 128 // Configuration callback on Error
H_Tsunemoto 0:47c1b6a0c166 129 void ERR0_callback(void) {
H_Tsunemoto 0:47c1b6a0c166 130 error("Oh no! My Mbed EXPLODED! :( Only kidding, go find the problem");
H_Tsunemoto 0:47c1b6a0c166 131 }