SPI slave DMA-read program for FRDMKL46Z, verified, working
Dependencies: SimpleDMA mbed-rtos mbed
dmaSPIslave.h@1:3cceef118195, 2015-07-16 (annotated)
- Committer:
- shreeshas95
- Date:
- Thu Jul 16 05:19:02 2015 +0000
- Revision:
- 1:3cceef118195
- Parent:
- 0:f0f5102ed9ca
- Child:
- 2:16545dbc88ae
working with tiva checked
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
shreeshas95 | 0:f0f5102ed9ca | 1 | #ifdef TARGET_KL46Z |
shreeshas95 | 0:f0f5102ed9ca | 2 | class dmaSPISlave : public SPISlave{ |
shreeshas95 | 0:f0f5102ed9ca | 3 | public: |
shreeshas95 | 0:f0f5102ed9ca | 4 | dmaSPISlave(PinName mosi, PinName miso, PinName sclk, PinName ssel) : SPISlave(mosi, miso, sclk, ssel){ |
shreeshas95 | 0:f0f5102ed9ca | 5 | // trigger appropriate spi for dma |
shreeshas95 | 0:f0f5102ed9ca | 6 | if(_spi.spi == SPI0){ |
shreeshas95 | 0:f0f5102ed9ca | 7 | read_dma.trigger(Trigger_SPI0_RX); |
shreeshas95 | 0:f0f5102ed9ca | 8 | } |
shreeshas95 | 0:f0f5102ed9ca | 9 | else{ |
shreeshas95 | 0:f0f5102ed9ca | 10 | read_dma.trigger(Trigger_SPI1_RX); |
shreeshas95 | 0:f0f5102ed9ca | 11 | } |
shreeshas95 | 0:f0f5102ed9ca | 12 | |
shreeshas95 | 0:f0f5102ed9ca | 13 | // set source for spi slave dma : mosi |
shreeshas95 | 0:f0f5102ed9ca | 14 | read_dma.source(&_spi.spi->DL, false); |
shreeshas95 | 0:f0f5102ed9ca | 15 | } |
shreeshas95 | 0:f0f5102ed9ca | 16 | |
shreeshas95 | 1:3cceef118195 | 17 | void bulkRead_init(uint8_t *read_data, int len, void (*fun)(void) ){ |
shreeshas95 | 0:f0f5102ed9ca | 18 | // acquire(); |
shreeshas95 | 0:f0f5102ed9ca | 19 | _spi.spi->C2 |= SPI_C2_RXDMAE_MASK; |
shreeshas95 | 0:f0f5102ed9ca | 20 | |
shreeshas95 | 0:f0f5102ed9ca | 21 | // auto increment is true |
shreeshas95 | 0:f0f5102ed9ca | 22 | read_dma.destination(read_data, true); |
shreeshas95 | 0:f0f5102ed9ca | 23 | |
shreeshas95 | 1:3cceef118195 | 24 | // specify length |
shreeshas95 | 1:3cceef118195 | 25 | length = len; |
shreeshas95 | 1:3cceef118195 | 26 | |
shreeshas95 | 1:3cceef118195 | 27 | // attach interrupt function |
shreeshas95 | 1:3cceef118195 | 28 | read_dma.attach(fun); |
shreeshas95 | 1:3cceef118195 | 29 | |
shreeshas95 | 1:3cceef118195 | 30 | // _spi.spi->C2 &= ~(SPI_C2_RXDMAE_MASK); |
shreeshas95 | 1:3cceef118195 | 31 | } |
shreeshas95 | 1:3cceef118195 | 32 | |
shreeshas95 | 1:3cceef118195 | 33 | void bulkRead_start(){ |
shreeshas95 | 0:f0f5102ed9ca | 34 | // start the read_dma |
shreeshas95 | 0:f0f5102ed9ca | 35 | read_dma.start(length); |
shreeshas95 | 1:3cceef118195 | 36 | } |
shreeshas95 | 0:f0f5102ed9ca | 37 | |
shreeshas95 | 0:f0f5102ed9ca | 38 | private: |
shreeshas95 | 1:3cceef118195 | 39 | int length; |
shreeshas95 | 0:f0f5102ed9ca | 40 | SimpleDMA read_dma; |
shreeshas95 | 0:f0f5102ed9ca | 41 | }; |
shreeshas95 | 0:f0f5102ed9ca | 42 | #endif |