Andy K / MODDMA

MODDMA GPDMA Controller New features: transfer pins to memory buffer under periodic timer control and send double buffers to DAC

Dependents:   FirstTest WaveSim IO-dma-memmem DACDMAfuncgenlib ... more

example1.h@17:97a16bf2ff43, 2013-03-02 (annotated)

Committer:
AjK
Date:
Sat Mar 02 19:27:12 2013 +0000
Revision:
17:97a16bf2ff43
Parent:
12:1dfee7208043 
1.13 See ChangeLog.c

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AjK 12:1dfee7208043 1 #include "mbed.h"
AjK 12:1dfee7208043 2 #include "MODDMA.h"
AjK 12:1dfee7208043 3 #include "MODSERIAL.h"
AjK 12:1dfee7208043 4
AjK 12:1dfee7208043 5 DigitalOut led1(LED1);
AjK 12:1dfee7208043 6 DigitalOut led2(LED2);
AjK 12:1dfee7208043 7 DigitalOut led3(LED3);
AjK 12:1dfee7208043 8 DigitalOut led4(LED4);
AjK 12:1dfee7208043 9 MODDMA dma;
AjK 12:1dfee7208043 10 MODSERIAL pc(USBTX, USBRX);
AjK 12:1dfee7208043 11
AjK 12:1dfee7208043 12 // Function prototypes for IRQ callbacks.
AjK 12:1dfee7208043 13 // See definitions following main() below.
AjK 12:1dfee7208043 14 void dmaTCCallback(void);
AjK 12:1dfee7208043 15 void dmaERRCallback(void);
AjK 12:1dfee7208043 16 void TC0_callback(void);
AjK 12:1dfee7208043 17 void ERR0_callback(void);
AjK 12:1dfee7208043 18
AjK 12:1dfee7208043 19 int main() {
AjK 12:1dfee7208043 20 char s[] = "**DMA** ABCDEFGHIJKLMNOPQRSTUVWXYZ **DMA**";
AjK 12:1dfee7208043 21
AjK 12:1dfee7208043 22 pc.baud(PC_BAUD);
AjK 12:1dfee7208043 23
AjK 12:1dfee7208043 24 dma.attach_tc( &dmaTCCallback );
AjK 12:1dfee7208043 25 dma.attach_err( &dmaERRCallback );
AjK 12:1dfee7208043 26
AjK 12:1dfee7208043 27 MODDMA_Config *config = new MODDMA_Config;
AjK 12:1dfee7208043 28 config
AjK 12:1dfee7208043 29 ->channelNum ( MODDMA::Channel_0 )
AjK 12:1dfee7208043 30 ->srcMemAddr ( (uint32_t) &s )
AjK 12:1dfee7208043 31 ->dstMemAddr ( 0 )
AjK 12:1dfee7208043 32 ->transferSize ( sizeof(s) )
AjK 12:1dfee7208043 33 ->transferType ( MODDMA::m2p )
AjK 12:1dfee7208043 34 ->transferWidth ( 0 )
AjK 12:1dfee7208043 35 ->srcConn ( 0 )
AjK 12:1dfee7208043 36 ->dstConn ( MODDMA::UART0_Tx )
AjK 12:1dfee7208043 37 ->dmaLLI ( 0 )
AjK 12:1dfee7208043 38 ->attach_tc ( &TC0_callback )
AjK 12:1dfee7208043 39 ->attach_err ( &ERR0_callback )
AjK 12:1dfee7208043 40 ; // config end
AjK 12:1dfee7208043 41
AjK 12:1dfee7208043 42 // Setup the configuration.
AjK 12:1dfee7208043 43 dma.Setup(config);
AjK 12:1dfee7208043 44
AjK 12:1dfee7208043 45 //dma.Enable( MODDMA::Channel_0 );
AjK 12:1dfee7208043 46 //dma.Enable( config->channelNum() );
AjK 12:1dfee7208043 47 dma.Enable( config );
AjK 12:1dfee7208043 48
AjK 12:1dfee7208043 49 while (1) {
AjK 12:1dfee7208043 50 led1 = !led1;
AjK 12:1dfee7208043 51 wait(0.25);
AjK 12:1dfee7208043 52 }
AjK 12:1dfee7208043 53 }
AjK 12:1dfee7208043 54
AjK 12:1dfee7208043 55 // Main controller TC IRQ callback
AjK 12:1dfee7208043 56 void dmaTCCallback(void) {
AjK 12:1dfee7208043 57 led2 = 1;
AjK 12:1dfee7208043 58 }
AjK 12:1dfee7208043 59
AjK 12:1dfee7208043 60 // Main controller ERR IRQ callback
AjK 12:1dfee7208043 61 void dmaERRCallback(void) {
AjK 12:1dfee7208043 62 error("Oh no! My Mbed exploded! :( Only kidding, find the problem");
AjK 12:1dfee7208043 63 }
AjK 12:1dfee7208043 64
AjK 12:1dfee7208043 65 // Configuration callback on TC
AjK 12:1dfee7208043 66 void TC0_callback(void) {
AjK 12:1dfee7208043 67 MODDMA_Config *config = dma.getConfig();
AjK 12:1dfee7208043 68 dma.haltAndWaitChannelComplete( (MODDMA::CHANNELS)config->channelNum());
AjK 12:1dfee7208043 69 dma.Disable( (MODDMA::CHANNELS)config->channelNum() );
AjK 12:1dfee7208043 70
AjK 12:1dfee7208043 71 // Configurations have two IRQ callbacks for TC and Err so you
AjK 12:1dfee7208043 72 // know which you are processing. However, if you want to use
AjK 12:1dfee7208043 73 // a single callback function you can tell what type of IRQ
AjK 12:1dfee7208043 74 // is being processed thus:-
AjK 12:1dfee7208043 75 if (dma.irqType() == MODDMA::TcIrq) {
AjK 12:1dfee7208043 76 led3 = 1;
AjK 12:1dfee7208043 77 dma.clearTcIrq();
AjK 12:1dfee7208043 78 }
AjK 12:1dfee7208043 79 if (dma.irqType() == MODDMA::ErrIrq) {
AjK 12:1dfee7208043 80 led4 = 1;
AjK 12:1dfee7208043 81 dma.clearErrIrq();
AjK 12:1dfee7208043 82 }
AjK 12:1dfee7208043 83 }
AjK 12:1dfee7208043 84
AjK 12:1dfee7208043 85 // Configuration cakllback on Error
AjK 12:1dfee7208043 86 void ERR0_callback(void) {
AjK 12:1dfee7208043 87 error("Oh no! My Mbed exploded! :( Only kidding, find the problem");
AjK 12:1dfee7208043 88 }
AjK 12:1dfee7208043 89