Diff: dmaSPIslave.h

Revision:

101:bece931236a2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dmaSPIslave.h	Tue Jan 26 13:15:01 2016 +0000
@@ -0,0 +1,68 @@
+#ifdef TARGET_KL46Z
+class dmaSPISlave : public SPISlave{
+    public:
+/*
+@brief:     constructor : initialise the spi slave pins
+@param:     mosi, miso, sclk, ssel
+@return:    none
+*/
+        dmaSPISlave(PinName mosi, PinName miso, PinName sclk, PinName ssel) : SPISlave(mosi, miso, sclk, ssel){
+//            trigger appropriate spi for dma
+            if(_spi.spi == SPI0){
+                read_dma.trigger(Trigger_SPI0_RX);
+            }
+            else{
+                read_dma.trigger(Trigger_SPI1_RX);
+            }
+            
+//            set source for spi slave dma : mosi
+            read_dma.source(&_spi.spi->DL, false);
+        }
+        
+/*
+@brief:     initialise the dma buffer to store the recevied data
+@param:     read_data : pointer to the buffer
+            len : length in bytes to store in the buffer
+            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
+@return:    none
+*/
+        void bulkRead_init(uint8_t *read_data, int len, void (*fun)(void) ){
+//            acquire();
+            _spi.spi->C2 |= SPI_C2_RXDMAE_MASK;
+        
+//            auto increment is true
+            read_dma.destination(read_data, true);
+        
+//            specify length
+            length = len;
+            
+//            attach interrupt function
+            read_dma.attach(fun);
+
+        }
+        
+/*
+@brief:     start the dma read process : has to be done everytime the buffer gets filled, can be used repeatedly
+@param:     none
+@return:    none
+*/
+        void bulkRead_start(){
+//            start the read_dma
+            read_dma.start(length);
+        }
+
+/*
+@brief:     end dma process and return back to normal spi mode
+@param:     none
+@return:    none
+*/
+        void bulkRead_end(){
+//            turn off dma
+            _spi.spi->C2 &= ~(SPI_C2_RXDMAE_MASK);
+        }
+        
+    private:
+        int length;
+        SimpleDMA read_dma;
+};
+#endif
\ No newline at end of file