Erik - / RTOS_SPI

Uses DMA to read/write SPI blocks, while putting the current thread in Wait state.

Dependencies:   SimpleDMA

Dependents:   SDFileSystem-RTOS

RTOS_SPI_KL25.cpp@4:0ab62cbad3aa, 2014-06-28 (annotated)

Committer:
Tomo2k
Date:
Sat Jun 28 06:55:08 2014 +0000
Revision:
4:0ab62cbad3aa
Parent:
2:d052724e2ad6 
Switch to using Erik's version of the SimpleDMA library

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Sissors 1:d021fb155bff 1 #ifdef TARGET_KL25Z
Sissors 0:004e5e86de4e 2 #include "RTOS_SPI.h"
Sissors 0:004e5e86de4e 3
Sissors 0:004e5e86de4e 4 RTOS_SPI::RTOS_SPI(PinName mosi, PinName miso, PinName sclk, PinName _unused) : SPI(mosi, miso, sclk) {
Sissors 0:004e5e86de4e 5 if (_spi.spi == SPI0) {
Sissors 0:004e5e86de4e 6 read_dma.trigger(Trigger_SPI0_RX);
Sissors 0:004e5e86de4e 7 write_dma.trigger(Trigger_SPI0_TX);
Sissors 0:004e5e86de4e 8 } else {
Sissors 0:004e5e86de4e 9 read_dma.trigger(Trigger_SPI1_RX);
Sissors 0:004e5e86de4e 10 write_dma.trigger(Trigger_SPI1_TX);
Sissors 0:004e5e86de4e 11 }
Sissors 0:004e5e86de4e 12
Sissors 0:004e5e86de4e 13 read_dma.source(&_spi.spi->D, false);
Sissors 0:004e5e86de4e 14 write_dma.destination(&_spi.spi->D, false);
Sissors 0:004e5e86de4e 15 };
Sissors 0:004e5e86de4e 16
Tomo2k 2:d052724e2ad6 17 void RTOS_SPI::bulkInternal(uint8_t *read_data, const uint8_t *write_data, int length, bool read_inc, bool write_inc) {
Sissors 0:004e5e86de4e 18 aquire();
Sissors 0:004e5e86de4e 19 _spi.spi->C2 |= SPI_C2_TXDMAE_MASK | SPI_C2_RXDMAE_MASK;
Sissors 0:004e5e86de4e 20
Sissors 0:004e5e86de4e 21 read_dma.destination(read_data, read_inc);
Sissors 0:004e5e86de4e 22 if (write_inc)
Sissors 0:004e5e86de4e 23 write_dma.source(write_data+1, write_inc);
Sissors 0:004e5e86de4e 24 else
Sissors 0:004e5e86de4e 25 write_dma.source(write_data, write_inc);
Sissors 0:004e5e86de4e 26
Sissors 0:004e5e86de4e 27 //simply start the read_dma
Sissors 0:004e5e86de4e 28 read_dma.start(length);
Sissors 0:004e5e86de4e 29
Sissors 0:004e5e86de4e 30 //Write the first byte manually, since this is recommended method (and the normal method sends the first byte twice)
Sissors 0:004e5e86de4e 31 while((_spi.spi->S & SPI_S_SPTEF_MASK) == 0);
Sissors 0:004e5e86de4e 32 _spi.spi->D = write_data[0];
Sissors 0:004e5e86de4e 33
Sissors 0:004e5e86de4e 34 write_dma.wait(length-1);
Sissors 0:004e5e86de4e 35 while(read_dma.isBusy());
Sissors 0:004e5e86de4e 36
Sissors 0:004e5e86de4e 37 _spi.spi->C2 &= ~(SPI_C2_TXDMAE_MASK | SPI_C2_RXDMAE_MASK);
Sissors 1:d021fb155bff 38 }
Sissors 1:d021fb155bff 39 #endif