samp Srinivasan / Mbed 2 deprecated CDMS_CODE_samp_23SEP_DMA_flag

CDMS_CODE_samp_23SEP_DMA_flag

Dependencies:   FreescaleIAP SimpleDMA mbed-rtos mbed

Fork of CDMS_CODE_samp_23SEP_DMA by iitm sat

dmaSPIslave.h@309:91755ef8f22a, 2016-11-22 (annotated)

Committer:
samp1234
Date:
Tue Nov 22 08:08:46 2016 +0000
Revision:
309:91755ef8f22a
Parent:
245:da9d1bd999da 
DMA to be checked, srp after dma start?

Who changed what in which revision?

UserRevisionLine numberNew contents of line
shreeshas95 101:bece931236a2 1 #ifdef TARGET_KL46Z
shreeshas95 101:bece931236a2 2 class dmaSPISlave : public SPISlave{
shreeshas95 101:bece931236a2 3 public:
shreeshas95 101:bece931236a2 4 /*
shreeshas95 101:bece931236a2 5 @brief: constructor : initialise the spi slave pins
shreeshas95 101:bece931236a2 6 @param: mosi, miso, sclk, ssel
shreeshas95 101:bece931236a2 7 @return: none
shreeshas95 101:bece931236a2 8 */
shreeshas95 101:bece931236a2 9 dmaSPISlave(PinName mosi, PinName miso, PinName sclk, PinName ssel) : SPISlave(mosi, miso, sclk, ssel){
shreeshas95 101:bece931236a2 10 // trigger appropriate spi for dma
shreeshas95 101:bece931236a2 11 if(_spi.spi == SPI0){
shreeshas95 101:bece931236a2 12 read_dma.trigger(Trigger_SPI0_RX);
shreeshas95 101:bece931236a2 13 }
shreeshas95 101:bece931236a2 14 else{
shreeshas95 101:bece931236a2 15 read_dma.trigger(Trigger_SPI1_RX);
shreeshas95 101:bece931236a2 16 }
shreeshas95 101:bece931236a2 17
shreeshas95 101:bece931236a2 18 // set source for spi slave dma : mosi
shreeshas95 101:bece931236a2 19 read_dma.source(&_spi.spi->DL, false);
shreeshas95 101:bece931236a2 20 }
shreeshas95 101:bece931236a2 21
shreeshas95 101:bece931236a2 22 /*
shreeshas95 101:bece931236a2 23 @brief: initialise the dma buffer to store the recevied data
shreeshas95 101:bece931236a2 24 @param: read_data : pointer to the buffer
shreeshas95 101:bece931236a2 25 len : length in bytes to store in the buffer
shreeshas95 101:bece931236a2 26 fun : address of the function to attach to the dma interrupt, interrupt is called when the len num of bytes are written to the buffer
shreeshas95 101:bece931236a2 27 @return: none
shreeshas95 101:bece931236a2 28 */
shreeshas95 101:bece931236a2 29 void bulkRead_init(uint8_t *read_data, int len, void (*fun)(void) ){
shreeshas95 101:bece931236a2 30 // acquire();
shreeshas95 101:bece931236a2 31 _spi.spi->C2 |= SPI_C2_RXDMAE_MASK;
shreeshas95 101:bece931236a2 32
shreeshas95 101:bece931236a2 33 // auto increment is true
shreeshas95 101:bece931236a2 34 read_dma.destination(read_data, true);
shreeshas95 101:bece931236a2 35
shreeshas95 101:bece931236a2 36 // specify length
shreeshas95 101:bece931236a2 37 length = len;
shreeshas95 101:bece931236a2 38
shreeshas95 101:bece931236a2 39 // attach interrupt function
shreeshas95 101:bece931236a2 40 read_dma.attach(fun);
shreeshas95 101:bece931236a2 41
shreeshas95 101:bece931236a2 42 }
shreeshas95 101:bece931236a2 43
ee12b079 245:da9d1bd999da 44 void bulkRead_pause(){
ee12b079 245:da9d1bd999da 45 read_dma.attach(NULL);
ee12b079 245:da9d1bd999da 46 }
ee12b079 245:da9d1bd999da 47
ee12b079 245:da9d1bd999da 48 void bulkRead_resume(void (*fun)(void)){
ee12b079 245:da9d1bd999da 49 read_dma.attach(fun);
ee12b079 245:da9d1bd999da 50 }
shreeshas95 101:bece931236a2 51 /*
shreeshas95 101:bece931236a2 52 @brief: start the dma read process : has to be done everytime the buffer gets filled, can be used repeatedly
shreeshas95 101:bece931236a2 53 @param: none
shreeshas95 101:bece931236a2 54 @return: none
shreeshas95 101:bece931236a2 55 */
shreeshas95 101:bece931236a2 56 void bulkRead_start(){
shreeshas95 101:bece931236a2 57 // start the read_dma
shreeshas95 101:bece931236a2 58 read_dma.start(length);
shreeshas95 101:bece931236a2 59 }
shreeshas95 101:bece931236a2 60
shreeshas95 101:bece931236a2 61 /*
ee12b079 178:5b42117b2ef1 62 @brief: end dma process and return back to normal spi mode, there should not be an unfinished 'start' when running end
shreeshas95 101:bece931236a2 63 @param: none
shreeshas95 101:bece931236a2 64 @return: none
shreeshas95 101:bece931236a2 65 */
shreeshas95 101:bece931236a2 66 void bulkRead_end(){
shreeshas95 101:bece931236a2 67 // turn off dma
shreeshas95 101:bece931236a2 68 _spi.spi->C2 &= ~(SPI_C2_RXDMAE_MASK);
shreeshas95 101:bece931236a2 69 }
shreeshas95 101:bece931236a2 70
ee12b079 178:5b42117b2ef1 71 /*
ee12b079 178:5b42117b2ef1 72 @brief: restart the dma process after 'end'ing
ee12b079 178:5b42117b2ef1 73 @param: none
ee12b079 178:5b42117b2ef1 74 @return: none
ee12b079 178:5b42117b2ef1 75 */
ee12b079 178:5b42117b2ef1 76 void bulkRead_restart(){
ee12b079 178:5b42117b2ef1 77 _spi.spi->C2 |= SPI_C2_RXDMAE_MASK;
ee12b079 178:5b42117b2ef1 78 }
shreeshas95 101:bece931236a2 79 private:
shreeshas95 101:bece931236a2 80 int length;
shreeshas95 101:bece931236a2 81 SimpleDMA read_dma;
shreeshas95 101:bece931236a2 82 };
ee12b079 245:da9d1bd999da 83 #endif