Added first pas at SPI::DMATransfer(byte *buf, int length) - and updated ILI9341 lib to use DMA Transfer for fill rect

STM32F1/libraries/Adafruit_ILI9341/Adafruit_ILI9341.cpp

@@ -327,9 +327,11 @@ void Adafruit_ILI9341::begin(void) {
 void Adafruit_ILI9341::setAddrWindow(uint16_t x0, uint16_t y0, uint16_t x1,
  uint16_t y1) {
 
+  byte buf[4];
   writecommand(ILI9341_CASET); // Column addr set
   *dcport |=  dcpinmask;
   *csport &= ~cspinmask;
+		
   SPI.write(x0 >> 8);
   SPI.write(x0 & 0xFF);     // XSTART 
   SPI.write(x1 >> 8);
@@ -338,11 +340,13 @@ void Adafruit_ILI9341::setAddrWindow(uint16_t x0, uint16_t y0, uint16_t x1,
   writecommand(ILI9341_PASET); // Row addr set
   *dcport |=  dcpinmask;
   *csport &= ~cspinmask;
+  
   SPI.write(y0>>8);
   SPI.write(y0);     // YSTART
   SPI.write(y1>>8);
   SPI.write(y1);     // YEND
 
+
   writecommand(ILI9341_RAMWR); // write to RAM
 }
 
@@ -433,9 +437,11 @@ void Adafruit_ILI9341::fillScreen(uint16_t color) {
 }
 
 // fill a rectangle
-void Adafruit_ILI9341::fillRect(int16_t x, int16_t y, int16_t w, int16_t h,
-  uint16_t color) {
+void Adafruit_ILI9341::fillRect(int16_t x, int16_t y, int16_t w, int16_t h,  uint16_t color) {
 	int numPixels;
+
+	unsigned char *buff;
+
 	// rudimentary clipping (drawChar w/big text requires this)
 	if((x >= _width) || (y >= _height)) return;
 	if((x + w - 1) >= _width)  w = _width  - x;
@@ -448,7 +454,27 @@ void Adafruit_ILI9341::fillRect(int16_t x, int16_t y, int16_t w, int16_t h,
   
 	*dcport |=  dcpinmask;
 	*csport &= ~cspinmask;
+	if (true)
+	{
+		// Use DMA
+		byte lineBuffer[h*2];// Buffer to be sent via DMA
 	  
+	    // need to build a buffer of the required height  (h) 
+		// Note I suspect there is a faster way to do this
+		for(int i=0;i<h*2;i++)
+		{
+			lineBuffer[i++] = hi&0xff;
+			lineBuffer[i]   = lo&0xff;
+		}
+		// Tansfer each line by DMA
+		for(int i=0;i<w;i++)
+		{
+			SPI.DMATransfer(lineBuffer,h*2);
+		}
+	}
+	else
+	{
+		// Non DMA method (currently not used)
 		for(y=h; y>0; y--) 
 		{
 			for(x=w; x>0; x--)
@@ -457,6 +483,7 @@ void Adafruit_ILI9341::fillRect(int16_t x, int16_t y, int16_t w, int16_t h,
 				SPI.write(lo);
 			}
 		}	
+	}
 	
 	if (hwSPI) spi_end();
 	*csport |= cspinmask;

STM32F1/libraries/SPI/src/SPI.cpp

@@ -330,6 +330,29 @@ uint8 SPIClass::transfer(uint8 byte) {
     return b;
 }
 
+uint8 SPIClass::DMATransfer(uint8 *data, uint32 length) {
+	uint8 b;
+	
+
+	
+	dma1_ch3_Active=true;
+	
+    spi_tx_dma_enable(SPI1);
+    dma_init(DMA1);
+	
+
+    dma_attach_interrupt(DMA1, DMA_CH3, &SPIClass::DMA1_CH3_Event);
+    dma_setup_transfer(DMA1, DMA_CH3, &SPI1->regs->DR, DMA_SIZE_8BITS,
+                       data, DMA_SIZE_8BITS, (DMA_MINC_MODE |  DMA_FROM_MEM | DMA_TRNS_CMPLT));
+	
+	  dma_set_num_transfers(DMA1, DMA_CH3, length); // 2 bytes per pixel
+	  dma_enable(DMA1, DMA_CH3);
+	  while (dma1_ch3_Active);
+	
+    return b;
+}
+
+
 void SPIClass::attachInterrupt(void) {
 	// Should be enableInterrupt()
 }

STM32F1/libraries/SPI/src/SPI.h

@@ -40,6 +40,7 @@
 
 #include <libmaple/libmaple_types.h>
 #include <libmaple/spi.h>
+#include <libmaple/dma.h>
 
 #include <boards.h>
 #include <stdint.h>
@@ -121,6 +122,7 @@ private:
 };
 
 
+volatile static bool dma1_ch3_Active;
 
 /**
  * @brief Wirish SPI interface.
@@ -130,6 +132,9 @@ private:
  */
 class SPIClass {
 public:
+
+
+
     /**
      * @param spiPortNumber Number of the SPI port to manage.
      */
@@ -223,6 +228,8 @@ public:
      */
     uint8 transfer(uint8 data);
 
+    uint8 DMATransfer(uint8 *data, uint32 length);
+
     /*
      * Pin accessors
      */
@@ -289,7 +296,14 @@ public:
 	
 	spi_dev *dev(){ return spi_d;}
 	
+	
+	
 private:
+
+	static inline void DMA1_CH3_Event() {
+		dma1_ch3_Active = 0;
+		dma_disable(DMA1, DMA_CH3);
+	}
 	spi_dev *spi_d;
 	uint8_t _SSPin;
 	uint32_t clockDivider;