To fix the hang problem
Dependencies: FreescaleIAP SimpleDMA mbed-rtos mbed
Fork of CDMS_CODE by
dmaSPIslave.h@345:8e6b2b4d244e, 2017-01-17 (annotated)
- Committer:
- samp1234
- Date:
- Tue Jan 17 06:19:27 2017 +0000
- Revision:
- 345:8e6b2b4d244e
- Parent:
- 338:d63eb331a67d
Changes include PL GPIO control during COM thread, SD card writing in science thread, Re-init HK Timer in alternate science thread to synchronise ISR.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
ee12b079 | 338:d63eb331a67d | 1 | #ifndef DMASPISLAVE_H // To make sure you don't declare the function more than once by including the header multiple times. |
ee12b079 | 338:d63eb331a67d | 2 | #define DMASPISLAVE_H |
ee12b079 | 338:d63eb331a67d | 3 | |
shreeshas95 | 101:bece931236a2 | 4 | #ifdef TARGET_KL46Z |
shreeshas95 | 101:bece931236a2 | 5 | class dmaSPISlave : public SPISlave{ |
shreeshas95 | 101:bece931236a2 | 6 | public: |
shreeshas95 | 101:bece931236a2 | 7 | /* |
shreeshas95 | 101:bece931236a2 | 8 | @brief: constructor : initialise the spi slave pins |
shreeshas95 | 101:bece931236a2 | 9 | @param: mosi, miso, sclk, ssel |
shreeshas95 | 101:bece931236a2 | 10 | @return: none |
shreeshas95 | 101:bece931236a2 | 11 | */ |
shreeshas95 | 101:bece931236a2 | 12 | dmaSPISlave(PinName mosi, PinName miso, PinName sclk, PinName ssel) : SPISlave(mosi, miso, sclk, ssel){ |
shreeshas95 | 101:bece931236a2 | 13 | // trigger appropriate spi for dma |
shreeshas95 | 101:bece931236a2 | 14 | if(_spi.spi == SPI0){ |
shreeshas95 | 101:bece931236a2 | 15 | read_dma.trigger(Trigger_SPI0_RX); |
shreeshas95 | 101:bece931236a2 | 16 | } |
shreeshas95 | 101:bece931236a2 | 17 | else{ |
shreeshas95 | 101:bece931236a2 | 18 | read_dma.trigger(Trigger_SPI1_RX); |
shreeshas95 | 101:bece931236a2 | 19 | } |
shreeshas95 | 101:bece931236a2 | 20 | |
shreeshas95 | 101:bece931236a2 | 21 | // set source for spi slave dma : mosi |
shreeshas95 | 101:bece931236a2 | 22 | read_dma.source(&_spi.spi->DL, false); |
shreeshas95 | 101:bece931236a2 | 23 | } |
shreeshas95 | 101:bece931236a2 | 24 | |
shreeshas95 | 101:bece931236a2 | 25 | /* |
shreeshas95 | 101:bece931236a2 | 26 | @brief: initialise the dma buffer to store the recevied data |
shreeshas95 | 101:bece931236a2 | 27 | @param: read_data : pointer to the buffer |
shreeshas95 | 101:bece931236a2 | 28 | len : length in bytes to store in the buffer |
shreeshas95 | 101:bece931236a2 | 29 | 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 | 30 | @return: none |
shreeshas95 | 101:bece931236a2 | 31 | */ |
shreeshas95 | 101:bece931236a2 | 32 | void bulkRead_init(uint8_t *read_data, int len, void (*fun)(void) ){ |
shreeshas95 | 101:bece931236a2 | 33 | // acquire(); |
shreeshas95 | 101:bece931236a2 | 34 | _spi.spi->C2 |= SPI_C2_RXDMAE_MASK; |
shreeshas95 | 101:bece931236a2 | 35 | |
shreeshas95 | 101:bece931236a2 | 36 | // auto increment is true |
shreeshas95 | 101:bece931236a2 | 37 | read_dma.destination(read_data, true); |
shreeshas95 | 101:bece931236a2 | 38 | |
shreeshas95 | 101:bece931236a2 | 39 | // specify length |
shreeshas95 | 101:bece931236a2 | 40 | length = len; |
shreeshas95 | 101:bece931236a2 | 41 | |
shreeshas95 | 101:bece931236a2 | 42 | // attach interrupt function |
shreeshas95 | 101:bece931236a2 | 43 | read_dma.attach(fun); |
shreeshas95 | 101:bece931236a2 | 44 | |
shreeshas95 | 101:bece931236a2 | 45 | } |
shreeshas95 | 101:bece931236a2 | 46 | |
ee12b079 | 245:da9d1bd999da | 47 | void bulkRead_pause(){ |
ee12b079 | 245:da9d1bd999da | 48 | read_dma.attach(NULL); |
ee12b079 | 245:da9d1bd999da | 49 | } |
ee12b079 | 245:da9d1bd999da | 50 | |
ee12b079 | 245:da9d1bd999da | 51 | void bulkRead_resume(void (*fun)(void)){ |
ee12b079 | 245:da9d1bd999da | 52 | read_dma.attach(fun); |
ee12b079 | 245:da9d1bd999da | 53 | } |
shreeshas95 | 101:bece931236a2 | 54 | /* |
shreeshas95 | 101:bece931236a2 | 55 | @brief: start the dma read process : has to be done everytime the buffer gets filled, can be used repeatedly |
shreeshas95 | 101:bece931236a2 | 56 | @param: none |
shreeshas95 | 101:bece931236a2 | 57 | @return: none |
shreeshas95 | 101:bece931236a2 | 58 | */ |
shreeshas95 | 101:bece931236a2 | 59 | void bulkRead_start(){ |
shreeshas95 | 101:bece931236a2 | 60 | // start the read_dma |
shreeshas95 | 101:bece931236a2 | 61 | read_dma.start(length); |
shreeshas95 | 101:bece931236a2 | 62 | } |
shreeshas95 | 101:bece931236a2 | 63 | |
shreeshas95 | 101:bece931236a2 | 64 | /* |
ee12b079 | 178:5b42117b2ef1 | 65 | @brief: end dma process and return back to normal spi mode, there should not be an unfinished 'start' when running end |
shreeshas95 | 101:bece931236a2 | 66 | @param: none |
shreeshas95 | 101:bece931236a2 | 67 | @return: none |
shreeshas95 | 101:bece931236a2 | 68 | */ |
shreeshas95 | 101:bece931236a2 | 69 | void bulkRead_end(){ |
shreeshas95 | 101:bece931236a2 | 70 | // turn off dma |
shreeshas95 | 101:bece931236a2 | 71 | _spi.spi->C2 &= ~(SPI_C2_RXDMAE_MASK); |
shreeshas95 | 101:bece931236a2 | 72 | } |
shreeshas95 | 101:bece931236a2 | 73 | |
ee12b079 | 178:5b42117b2ef1 | 74 | /* |
ee12b079 | 178:5b42117b2ef1 | 75 | @brief: restart the dma process after 'end'ing |
ee12b079 | 178:5b42117b2ef1 | 76 | @param: none |
ee12b079 | 178:5b42117b2ef1 | 77 | @return: none |
ee12b079 | 178:5b42117b2ef1 | 78 | */ |
ee12b079 | 178:5b42117b2ef1 | 79 | void bulkRead_restart(){ |
ee12b079 | 178:5b42117b2ef1 | 80 | _spi.spi->C2 |= SPI_C2_RXDMAE_MASK; |
ee12b079 | 178:5b42117b2ef1 | 81 | } |
shreeshas95 | 101:bece931236a2 | 82 | private: |
shreeshas95 | 101:bece931236a2 | 83 | int length; |
shreeshas95 | 101:bece931236a2 | 84 | SimpleDMA read_dma; |
shreeshas95 | 101:bece931236a2 | 85 | }; |
ee12b079 | 245:da9d1bd999da | 86 | #endif |
ee12b079 | 338:d63eb331a67d | 87 | #endif |