Wouter van Kleunen / Mbed OS SimpleDma-test

Test for the SimpleDMA library for KL46z

Dependencies:   SimpleDMA

main.cpp@0:4b9437bac3eb, 2017-05-12 (annotated)

Committer:
wkleunen
Date:
Fri May 12 10:27:39 2017 +0000
Revision:
0:4b9437bac3eb
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
wkleunen 0:4b9437bac3eb 1 #include "mbed.h"
wkleunen 0:4b9437bac3eb 2 #include "SimpleDMA.h"
wkleunen 0:4b9437bac3eb 3
wkleunen 0:4b9437bac3eb 4 DigitalOut led1(LED_GREEN);
wkleunen 0:4b9437bac3eb 5 SimpleDMA dma(0);
wkleunen 0:4b9437bac3eb 6 RawSerial pc(USBTX, USBRX);
wkleunen 0:4b9437bac3eb 7
wkleunen 0:4b9437bac3eb 8 AnalogIn light_sensor(PTE22);
wkleunen 0:4b9437bac3eb 9
wkleunen 0:4b9437bac3eb 10 EventQueue queue(32*EVENTS_EVENT_SIZE);
wkleunen 0:4b9437bac3eb 11
wkleunen 0:4b9437bac3eb 12 char characters[] = "abcdefgh\r\n"; //Characters we send
wkleunen 0:4b9437bac3eb 13 char characters2[sizeof(characters)]; //Second buffer
wkleunen 0:4b9437bac3eb 14
wkleunen 0:4b9437bac3eb 15 void blink()
wkleunen 0:4b9437bac3eb 16 {
wkleunen 0:4b9437bac3eb 17 led1 = !led1;
wkleunen 0:4b9437bac3eb 18 }
wkleunen 0:4b9437bac3eb 19
wkleunen 0:4b9437bac3eb 20 void DMA_Done()
wkleunen 0:4b9437bac3eb 21 {
wkleunen 0:4b9437bac3eb 22 pc.printf("Done!!");
wkleunen 0:4b9437bac3eb 23 }
wkleunen 0:4b9437bac3eb 24
wkleunen 0:4b9437bac3eb 25 void DMA_UART_Done(int channel)
wkleunen 0:4b9437bac3eb 26 {
wkleunen 0:4b9437bac3eb 27 DMA_Done();
wkleunen 0:4b9437bac3eb 28 }
wkleunen 0:4b9437bac3eb 29
wkleunen 0:4b9437bac3eb 30 void DMA_UART_Start()
wkleunen 0:4b9437bac3eb 31 {
wkleunen 0:4b9437bac3eb 32 //Now to UART, enable DMA in UART, destination is now
wkleunen 0:4b9437bac3eb 33 //a fixed address, so address pointer should not be incremented,
wkleunen 0:4b9437bac3eb 34 //thus second argument is false. Also set trigger to UART0_RX.
wkleunen 0:4b9437bac3eb 35 //This sends a new value to the UART as soon as it is possible
wkleunen 0:4b9437bac3eb 36 #ifdef TARGET_LPC1768
wkleunen 0:4b9437bac3eb 37 LPC_UART0->FCR |= 1<<3;
wkleunen 0:4b9437bac3eb 38 dma.destination(&LPC_UART0->THR, false);
wkleunen 0:4b9437bac3eb 39 #endif
wkleunen 0:4b9437bac3eb 40 #ifdef TARGET_KL46Z
wkleunen 0:4b9437bac3eb 41 UART0->C5 |= (1<<7) | (1<<5);
wkleunen 0:4b9437bac3eb 42 dma.destination(&UART0->D, false);
wkleunen 0:4b9437bac3eb 43 #endif
wkleunen 0:4b9437bac3eb 44 dma.source(characters2, true);
wkleunen 0:4b9437bac3eb 45 dma.trigger(Trigger_UART0_TX);
wkleunen 0:4b9437bac3eb 46 dma.attach(queue.event(DMA_UART_Done));
wkleunen 0:4b9437bac3eb 47
wkleunen 0:4b9437bac3eb 48 dma.start(sizeof(characters));
wkleunen 0:4b9437bac3eb 49 }
wkleunen 0:4b9437bac3eb 50
wkleunen 0:4b9437bac3eb 51 void DMA_Memcpy_Done(osThreadId id, int channel)
wkleunen 0:4b9437bac3eb 52 {
wkleunen 0:4b9437bac3eb 53 osSignalSet(id, 0x01);
wkleunen 0:4b9437bac3eb 54 }
wkleunen 0:4b9437bac3eb 55
wkleunen 0:4b9437bac3eb 56 void DMA_Memcpy_Start()
wkleunen 0:4b9437bac3eb 57 {
wkleunen 0:4b9437bac3eb 58 pc.printf("Start\r\n");
wkleunen 0:4b9437bac3eb 59 pc.printf("Use DMA to send 10 characters from buffer to buffer\r\n");
wkleunen 0:4b9437bac3eb 60 pc.printf("Then send them to UART0 (PC)\r\n");
wkleunen 0:4b9437bac3eb 61
wkleunen 0:4b9437bac3eb 62 osThreadId id = Thread::gettid();
wkleunen 0:4b9437bac3eb 63
wkleunen 0:4b9437bac3eb 64 //Set source and destination, second argument is true since
wkleunen 0:4b9437bac3eb 65 //we should run through both arrays
wkleunen 0:4b9437bac3eb 66 dma.source(characters, true);
wkleunen 0:4b9437bac3eb 67 dma.destination(characters2, true);
wkleunen 0:4b9437bac3eb 68 dma.attach(mbed::callback(DMA_Memcpy_Done, id));
wkleunen 0:4b9437bac3eb 69
wkleunen 0:4b9437bac3eb 70 //Start transfer of 10 characters
wkleunen 0:4b9437bac3eb 71 dma.start(10);
wkleunen 0:4b9437bac3eb 72
wkleunen 0:4b9437bac3eb 73 // And wait for the signal to arrive
wkleunen 0:4b9437bac3eb 74 Thread::signal_wait(0x1);
wkleunen 0:4b9437bac3eb 75 pc.printf("Memcpy transfer done\n\r");
wkleunen 0:4b9437bac3eb 76
wkleunen 0:4b9437bac3eb 77 }
wkleunen 0:4b9437bac3eb 78
wkleunen 0:4b9437bac3eb 79 int main()
wkleunen 0:4b9437bac3eb 80 {
wkleunen 0:4b9437bac3eb 81 queue.call_every(300, blink);
wkleunen 0:4b9437bac3eb 82 queue.call(DMA_Memcpy_Start);
wkleunen 0:4b9437bac3eb 83 queue.dispatch();
wkleunen 0:4b9437bac3eb 84 }