Introduction

SimpleDMA is a standard library for different DMA peripherals. Currently the LPC1768, KL46Z and KL25Z are supported. It provided one set of functions for different peripherals. It does not allow for usage of all the advanced functions, partially because the goal was to provide a simple interface, and partially because they are different for different microcontrollers.

Examples

Helloworld: http://mbed.org/users/Sissors/code/SimpleDMA_HelloWorld/

Example in a library (SPI): http://mbed.org/users/Sissors/code/RTOS_SPI/

SimpleDMA_common.cpp@9:f7345d41b076, 2017-05-12 (annotated)

Committer:: wkleunen
Date:: Fri May 12 10:26:15 2017 +0000
Revision:: 9:f7345d41b076
Parent:: 5:d9f46ef80e20

Use callback template class to integrate library with mbed os 5.

Who changed what in which revision?

User	Revision	Line number	New contents of line
Sissors	5:d9f46ef80e20	1	#include "SimpleDMA.h"
Sissors	5:d9f46ef80e20	2
Sissors	5:d9f46ef80e20	3	void SimpleDMA::channel(int chan) {
Sissors	5:d9f46ef80e20	4	if (chan == -1) {
Sissors	5:d9f46ef80e20	5	auto_channel = true;
Sissors	5:d9f46ef80e20	6	_channel = 0;
Sissors	5:d9f46ef80e20	7	} else {
Sissors	5:d9f46ef80e20	8	auto_channel = false;
Sissors	5:d9f46ef80e20	9	if (chan >= 0 && chan < DMA_CHANNELS)
Sissors	5:d9f46ef80e20	10	_channel = chan;
Sissors	5:d9f46ef80e20	11	else
Sissors	5:d9f46ef80e20	12	_channel = DMA_CHANNELS-1;
Sissors	5:d9f46ef80e20	13	}
Sissors	5:d9f46ef80e20	14	}
Sissors	5:d9f46ef80e20	15
Sissors	5:d9f46ef80e20	16	int SimpleDMA::getFreeChannel(void) {
Sissors	5:d9f46ef80e20	17	int retval = 0;
Sissors	5:d9f46ef80e20	18	while(1) {
Sissors	5:d9f46ef80e20	19	if (!isBusy(retval))
Sissors	5:d9f46ef80e20	20	return retval;
Sissors	5:d9f46ef80e20	21	retval++;
Sissors	5:d9f46ef80e20	22	if (retval >= DMA_CHANNELS)
Sissors	5:d9f46ef80e20	23	retval = 0;
Sissors	5:d9f46ef80e20	24	}
Sissors	5:d9f46ef80e20	25	}