Diff: SPI_TFT_ILI9341.cpp

Revision:

8:07ad6a48a85d

Parent:

7:4c30bea883bc

--- a/SPI_TFT_ILI9341.cpp	Sun Jan 26 20:54:21 2014 +0000
+++ b/SPI_TFT_ILI9341.cpp	Sun Jun 22 21:44:00 2014 +0000
@@ -1,5 +1,6 @@
 /* mbed library for 240*320 pixel display TFT based on ILI9341 LCD Controller
- * Copyright (c) 2013 Peter Drescher - DC2PD
+ * Copyright (c) 2013, 2014 Peter Drescher - DC2PD
+ * special version for STM Nucleo -L152 and SPI1 !
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
@@ -9,21 +10,19 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
- 
-// 12.06.13 fork from SPI_TFT code because controller is different ...
-// 14.07.13 Test with real display and bugfix 
-// 18.10.13 Better Circle function from Michael Ammann
-// 22.10.13 Fixes for Kinetis Board - 8 bit spi
-// 26.01.14 Change interface for BMP_16 to also use SD-cards
 
 #include "SPI_TFT_ILI9341.h"
 #include "mbed.h"
+#include "stm32l1xx_dma.h"
+#include "stm32l1xx_rcc.h"
+#include "stm32l1xx_spi.h"
 
-#define BPP         16                  // Bits per pixel    
-         
+#define BPP         16                  // Bits per pixel
+
 //extern Serial pc;
 //extern DigitalOut xx;     // debug !!
 
+
 SPI_TFT_ILI9341::SPI_TFT_ILI9341(PinName mosi, PinName miso, PinName sclk, PinName cs, PinName reset, PinName dc, const char *name)
     : _spi(mosi, miso, sclk), _cs(cs), _reset(reset), _dc(dc), GraphicsDisplay(name)
 {
@@ -65,9 +64,9 @@
             _spi.write(0xE8);
             break;
     }
-    _cs = 1; 
+    _cs = 1;
     WindowMax();
-} 
+}
 
 
 // write command to tft register
@@ -76,7 +75,8 @@
 {
     _dc = 0;
     _cs = 0;
-    _spi.write(cmd);      // mbed lib
+    SPI1->DR = cmd;
+    do{}while((SPI1->SR & 0x80) == 0x80);    // wait for SPI send
     _dc = 1;
 }
 
@@ -84,22 +84,23 @@
 
 void SPI_TFT_ILI9341::wr_dat(unsigned char dat)
 {
-   _spi.write(dat);      // mbed lib
+   SPI1->DR = dat;
+   do{}while((SPI1->SR & 0x80) == 0x80);    // wait for SPI send
 }
 
-
-
-// the ILI9341 can read 
+// the ILI9341 can read
 
 char SPI_TFT_ILI9341::rd_byte(unsigned char cmd)
 {
     char r;
     _dc = 0;
     _cs = 0;
-    _spi.write(cmd);      // mbed lib
+    SPI1->DR = cmd;
+    do{}while(SPI1->SR & 0x02 == 0);    // wait for SPI send
+    SPI1->DR = 0xFF;
+    do{}while(SPI1->SR & 0x02 == 0);    // wait for SPI send
+    r = SPI1->DR;
     _cs = 1;
-    r = _spi.write(0xff);
-    _cs = 1;    
     return(r);
 }
 
@@ -114,7 +115,7 @@
     d = d << 1;
     _spi.format(9,3);    // we have to add a dummy clock cycle
     _spi.write(d);
-    _spi.format(8,3);   
+    _spi.format(8,3);
     _dc = 1;
     r = _spi.write(0xff);
     d = r;
@@ -124,7 +125,7 @@
     d = (d << 8) | r;
     r = _spi.write(0xff);
     d = (d << 8) | r;
-    _cs = 1;    
+    _cs = 1;
     return(d);
 }
 
@@ -139,204 +140,246 @@
 
 
 // Init code based on MI0283QT datasheet
+// this code is called only at start
+// no need to be optimized
 
 void SPI_TFT_ILI9341::tft_reset()
 {
     _spi.format(8,3);                  // 8 bit spi mode 3
-    _spi.frequency(10000000);          // 10 Mhz SPI clock
+    _spi.frequency(8000000);          // 8 Mhz SPI clock - 32 / 4
     _cs = 1;                           // cs high
-    _dc = 1;                           // dc high 
+    _dc = 1;                           // dc high
     _reset = 0;                        // display reset
 
     wait_us(50);
     _reset = 1;                       // end hardware reset
     wait_ms(5);
-     
-    wr_cmd(0x01);                     // SW reset  
+
+    wr_cmd(0x01);                     // SW reset
     wait_ms(5);
-    wr_cmd(0x28);                     // display off  
+    wr_cmd(0x28);                     // display off
 
     /* Start Initial Sequence ----------------------------------------------------*/
-     wr_cmd(0xCF);                     
+     wr_cmd(0xCF);
      _spi.write(0x00);
      _spi.write(0x83);
      _spi.write(0x30);
      _cs = 1;
-     
-     wr_cmd(0xED);                     
+
+     wr_cmd(0xED);
      _spi.write(0x64);
      _spi.write(0x03);
      _spi.write(0x12);
      _spi.write(0x81);
      _cs = 1;
-     
-     wr_cmd(0xE8);                     
+
+     wr_cmd(0xE8);
      _spi.write(0x85);
      _spi.write(0x01);
      _spi.write(0x79);
      _cs = 1;
-     
-     wr_cmd(0xCB);                     
+
+     wr_cmd(0xCB);
      _spi.write(0x39);
      _spi.write(0x2C);
      _spi.write(0x00);
      _spi.write(0x34);
      _spi.write(0x02);
      _cs = 1;
-           
-     wr_cmd(0xF7);                     
+
+     wr_cmd(0xF7);
      _spi.write(0x20);
      _cs = 1;
-           
-     wr_cmd(0xEA);                     
+
+     wr_cmd(0xEA);
      _spi.write(0x00);
      _spi.write(0x00);
      _cs = 1;
-     
+
      wr_cmd(0xC0);                     // POWER_CONTROL_1
      _spi.write(0x26);
      _cs = 1;
- 
+
      wr_cmd(0xC1);                     // POWER_CONTROL_2
      _spi.write(0x11);
      _cs = 1;
-     
+
      wr_cmd(0xC5);                     // VCOM_CONTROL_1
      _spi.write(0x35);
      _spi.write(0x3E);
      _cs = 1;
-     
+
      wr_cmd(0xC7);                     // VCOM_CONTROL_2
      _spi.write(0xBE);
-     _cs = 1; 
-     
+     _cs = 1;
+
      wr_cmd(0x36);                     // MEMORY_ACCESS_CONTROL
      _spi.write(0x48);
-     _cs = 1; 
-     
+     _cs = 1;
+
      wr_cmd(0x3A);                     // COLMOD_PIXEL_FORMAT_SET
-     _spi.write(0x55);                 // 16 bit pixel 
+     _spi.write(0x55);                 // 16 bit pixel
      _cs = 1;
-     
+
      wr_cmd(0xB1);                     // Frame Rate
      _spi.write(0x00);
-     _spi.write(0x1B);               
+     _spi.write(0x1B);
      _cs = 1;
-     
+
      wr_cmd(0xF2);                     // Gamma Function Disable
      _spi.write(0x08);
-     _cs = 1; 
-     
-     wr_cmd(0x26);                     
+     _cs = 1;
+
+     wr_cmd(0x26);
      _spi.write(0x01);                 // gamma set for curve 01/2/04/08
-     _cs = 1; 
-     
+     _cs = 1;
+
      wr_cmd(0xE0);                     // positive gamma correction
-     _spi.write(0x1F); 
-     _spi.write(0x1A); 
-     _spi.write(0x18); 
-     _spi.write(0x0A); 
-     _spi.write(0x0F); 
-     _spi.write(0x06); 
-     _spi.write(0x45); 
-     _spi.write(0x87); 
-     _spi.write(0x32); 
-     _spi.write(0x0A); 
-     _spi.write(0x07); 
-     _spi.write(0x02); 
+     _spi.write(0x1F);
+     _spi.write(0x1A);
+     _spi.write(0x18);
+     _spi.write(0x0A);
+     _spi.write(0x0F);
+     _spi.write(0x06);
+     _spi.write(0x45);
+     _spi.write(0x87);
+     _spi.write(0x32);
+     _spi.write(0x0A);
      _spi.write(0x07);
-     _spi.write(0x05); 
+     _spi.write(0x02);
+     _spi.write(0x07);
+     _spi.write(0x05);
      _spi.write(0x00);
      _cs = 1;
-     
+
      wr_cmd(0xE1);                     // negativ gamma correction
-     _spi.write(0x00); 
-     _spi.write(0x25); 
-     _spi.write(0x27); 
-     _spi.write(0x05); 
-     _spi.write(0x10); 
-     _spi.write(0x09); 
-     _spi.write(0x3A); 
-     _spi.write(0x78); 
-     _spi.write(0x4D); 
-     _spi.write(0x05); 
-     _spi.write(0x18); 
-     _spi.write(0x0D); 
+     _spi.write(0x00);
+     _spi.write(0x25);
+     _spi.write(0x27);
+     _spi.write(0x05);
+     _spi.write(0x10);
+     _spi.write(0x09);
+     _spi.write(0x3A);
+     _spi.write(0x78);
+     _spi.write(0x4D);
+     _spi.write(0x05);
+     _spi.write(0x18);
+     _spi.write(0x0D);
      _spi.write(0x38);
-     _spi.write(0x3A); 
+     _spi.write(0x3A);
      _spi.write(0x1F);
      _cs = 1;
-     
+
      WindowMax ();
-     
+
      //wr_cmd(0x34);                     // tearing effect off
      //_cs = 1;
-     
+
      //wr_cmd(0x35);                     // tearing effect on
      //_cs = 1;
-      
+
      wr_cmd(0xB7);                       // entry mode
      _spi.write(0x07);
      _cs = 1;
-     
+
      wr_cmd(0xB6);                       // display function control
      _spi.write(0x0A);
      _spi.write(0x82);
      _spi.write(0x27);
      _spi.write(0x00);
      _cs = 1;
-     
+
      wr_cmd(0x11);                     // sleep out
      _cs = 1;
-     
+
      wait_ms(100);
-     
+
      wr_cmd(0x29);                     // display on
      _cs = 1;
-     
+
      wait_ms(100);
-     
+
+    //    Configure the DMA controller init-structure
+    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);    // SPI1 is using DMA 1
+    DMA_StructInit(&DMA_InitStructure);
+    DMA_InitStructure.DMA_PeripheralBaseAddr  = (uint32_t) &(SPI1->DR);
+    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
+    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
+    DMA_InitStructure.DMA_BufferSize  = 0;
+    DMA_InitStructure.DMA_PeripheralInc  = DMA_PeripheralInc_Disable;
+    DMA_InitStructure.DMA_PeripheralDataSize  = DMA_PeripheralDataSize_HalfWord;
+    DMA_InitStructure.DMA_MemoryDataSize  = DMA_MemoryDataSize_HalfWord;
+    DMA_InitStructure.DMA_Mode  = DMA_Mode_Normal;
+    DMA_InitStructure.DMA_Priority  = DMA_Priority_High;
  }
 
 
+// speed optimized
+// write direct to SPI1 register !
 void SPI_TFT_ILI9341::pixel(int x, int y, int color)
 {
-    wr_cmd(0x2A);
-    _spi.write(x >> 8);
-    _spi.write(x);
-    _cs = 1;
-    wr_cmd(0x2B);
-    _spi.write(y >> 8);
-    _spi.write(y);
+    _dc = 0;
+    _cs = 0;
+    SPI1->DR = 0x2A;
+    do{}while((SPI1->SR & 0x80) == 0x80);    // wait for SPI send
+    _dc = 1;
+    SPI1->CR1 |= 1 << 11;   // switch to 16 bit Mode
+    SPI1->DR = x;
+    do{}while((SPI1->SR & 0x80) == 0x80);    // wait for SPI send
+
     _cs = 1;
-    wr_cmd(0x2C);  // send pixel
-    #if defined TARGET_KL25Z  // 8 Bit SPI
-    _spi.write(color >> 8);
-    _spi.write(color & 0xff);
-    #else 
-    _spi.format(16,3);                            // switch to 16 bit Mode 3
-    _spi.write(color);                              // Write D0..D15
-    _spi.format(8,3);
-    #endif
+    SPI1->CR1 &= ~(1 << 11);   // switch to 8 bit Mode
+    _dc = 0;
+    _cs = 0;
+    SPI1->DR = 0x2B;
+    do{}while((SPI1->SR & 0x80) == 0x80);    // wait for SPI send
+    _dc = 1;
+    SPI1->CR1 |= 1 << 11;   // switch to 16 bit Mode
+    SPI1->DR = y;
+    do{}while((SPI1->SR & 0x80) == 0x80);    // wait for SPI send
     _cs = 1;
+    SPI1->CR1 &= ~(1 << 11);   // switch to 8 bit Mode
+    _dc = 0;
+    _cs = 0;
+    SPI1->DR = 0x2C; // send pixel
+    do{}while((SPI1->SR & 0x80) == 0x80);    // wait for SPI send
+    _dc = 1;
+    SPI1->CR1 |= 1 << 11;   // switch to 16 bit Mode
+    SPI1->DR = color;
+    do{}while((SPI1->SR & 0x80) == 0x80);    // wait for SPI send
+
+    _cs = 1;
+    SPI1->CR1 &= ~(1 << 11);   // switch to 8 bit Mode
 }
 
-
+// optimized
+// write direct to SPI1 register !
 void SPI_TFT_ILI9341::window (unsigned int x, unsigned int y, unsigned int w, unsigned int h)
 {
-    wr_cmd(0x2A);
-    _spi.write(x >> 8);
-    _spi.write(x);
-    _spi.write((x+w-1) >> 8);
-    _spi.write(x+w-1);
-    
+    _dc = 0;
+    _cs = 0;
+    SPI1->DR = 0x2A;
+    do{}while((SPI1->SR & 0x80) == 0x80);    // wait for SPI send
+    _dc = 1;
+    SPI1->CR1 |= 1 << 11;   // switch to 16 bit Mode
+    SPI1->DR = x ;
+    do{}while((SPI1->SR & 0x02) == 0);    // wait for SPI TX buffer free
+    SPI1->DR = (x+w-1);
+    do{}while((SPI1->SR & 0x80) == 0x80);    // wait for SPI send
     _cs = 1;
-    wr_cmd(0x2B);
-    _spi.write(y >> 8);
-    _spi.write(y);
-    _spi.write((y+h-1) >> 8);
-    _spi.write(y+h-1);
+    _dc = 0;
+    SPI1->CR1 &= ~(1 << 11);   // switch to 8 bit Mode
+    _cs = 0;
+    SPI1->DR = 0x2B;
+    do{}while((SPI1->SR & 0x80) == 0x80);    // wait for SPI send
+    _dc = 1;
+    SPI1->CR1 |= 1 << 11;   // switch to 16 bit Mode
+    SPI1->DR = y ;
+    do{}while((SPI1->SR & 0x02) == 0);    // wait for SPI TX buffer free
+    SPI1->DR = (y+h-1);
+    do{}while((SPI1->SR & 0x80) == 0x80);    // wait for SPI send
     _cs = 1;
+    SPI1->CR1 &= ~(1 << 11);   // switch to 8 bit Mode
 }
 
 
@@ -345,28 +388,38 @@
     window (0, 0, width(),  height());
 }
 
-
-
+// optimized
+// use DMA to transfer pixel data to the screen
 void SPI_TFT_ILI9341::cls (void)
 {
     int pixel = ( width() * height());
     WindowMax();
-    wr_cmd(0x2C);  // send pixel
-    #if defined TARGET_KL25Z  // 8 Bit SPI
-    unsigned int i;
-    for (i = 0; i < ( width() * height()); i++){
-        _spi.write(_background >> 8);
-        _spi.write(_background & 0xff);
-        }
-    
-    #else 
-    _spi.format(16,3);                            // switch to 16 bit Mode 3
-    unsigned int i;
-    for (i = 0; i < ( width() * height()); i++)
-        _spi.write(_background);
-    _spi.format(8,3);    
-    #endif                         
-    _cs = 1; 
+    _dc = 0;
+    _cs = 0;
+    SPI1->DR = 0x2C; // send pixel
+    do{}while((SPI1->SR & 0x80) == 0x80);    // wait for SPI send
+    _dc = 1;
+    SPI1->CR1 |= 1 << 11;   // switch to 16 bit Mode
+
+    // set up the DMA structure for single byte
+    DMA_InitStructure.DMA_MemoryBaseAddr  = (uint32_t) &_background;
+    DMA_InitStructure.DMA_MemoryInc  = DMA_MemoryInc_Disable;
+    DMA_Init(DMA1_Channel3, &DMA_InitStructure);  // init the DMA
+    // we have to send 2 blocks of pixel date, because the DMA counter can only transfer 64k
+    DMA_SetCurrDataCounter(DMA1_Channel3, 38400);           // 1.half of screen
+    SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx,ENABLE);
+    DMA_Cmd(DMA1_Channel3, ENABLE);
+    do{
+    }while(DMA_GetCurrDataCounter(DMA1_Channel3) != 0);     // wait for end of transfer
+    DMA_Cmd(DMA1_Channel3, DISABLE);
+    DMA_SetCurrDataCounter(DMA1_Channel3, 38400);           // 2.half of screen
+    DMA_Cmd(DMA1_Channel3, ENABLE);
+    do{
+    }while(DMA_GetCurrDataCounter(DMA1_Channel3) != 0);    // wait for end of transfer
+    DMA_Cmd(DMA1_Channel3, DISABLE);
+    do{}while((SPI1->SR & 0x80) == 0x80);    // wait for SPI send
+    _cs = 1;
+    SPI1->CR1 &= ~(1 << 11);   // switch to 8 bit Mode
 }
 
 
@@ -405,26 +458,24 @@
 }
 
 
+// optimized for speed
+// use SPI1 register access !!
 void SPI_TFT_ILI9341::hline(int x0, int x1, int y, int color)
 {
     int w;
     w = x1 - x0 + 1;
     window(x0,y,w,1);
     wr_cmd(0x2C);  // send pixel
-    #if defined TARGET_KL25Z  // 8 Bit SPI
+
+    SPI1->CR1 |= 1 << 11;   // switch to 16 bit Mode
+
     int j;
     for (j=0; j<w; j++) {
-        _spi.write(color >> 8);
-        _spi.write(color & 0xff);
-    } 
-    #else 
-    _spi.format(16,3);                            // switch to 16 bit Mode 3
-    int j;
-    for (j=0; j<w; j++) {
-        _spi.write(color);
+        SPI1->DR = color;
+        do{}while((SPI1->SR & 0x02) == 0);    // wait for SPI TX buffer free
     }
-    _spi.format(8,3);
-    #endif
+    do{}while((SPI1->SR & 0x80) == 0x80);    // wait for SPI send
+    SPI1->CR1 &= ~(1 << 11);   // switch to 8 bit Mode
     _cs = 1;
     WindowMax();
     return;
@@ -436,18 +487,12 @@
     h = y1 - y0 + 1;
     window(x,y0,1,h);
     wr_cmd(0x2C);  // send pixel
-    #if defined TARGET_KL25Z  // 8 Bit SPI
-    for (int y=0; y<h; y++) {
-        _spi.write(color >> 8);
-        _spi.write(color & 0xff);
-    } 
-    #else 
+
     _spi.format(16,3);                            // switch to 16 bit Mode 3
     for (int y=0; y<h; y++) {
         _spi.write(color);
     }
-    _spi.format(8,3);
-    #endif
+    SPI1->CR1 &= ~(1 << 11);   // switch to 8 bit Mode
     _cs = 1;
     WindowMax();
     return;
@@ -547,26 +592,39 @@
 
 
 
+// optimized for speed
+// use DMA
 void SPI_TFT_ILI9341::fillrect(int x0, int y0, int x1, int y1, int color)
 {
 
     int h = y1 - y0 + 1;
     int w = x1 - x0 + 1;
     int pixel = h * w;
+    unsigned int dma_transfer;
     window(x0,y0,w,h);
-    wr_cmd(0x2C);  // send pixel 
-    #if defined TARGET_KL25Z  // 8 Bit SPI
-    for (int p=0; p<pixel; p++) {
-        _spi.write(color >> 8);
-        _spi.write(color & 0xff);
-    }
-   #else
-    _spi.format(16,3);                            // switch to 16 bit Mode 3
-    for (int p=0; p<pixel; p++) {
-        _spi.write(color);
-    }
-    _spi.format(8,3);
-    #endif
+    wr_cmd(0x2C);  // send pixel
+    SPI1->CR1 |= 1 << 11;   // switch to 16 bit Mode
+    DMA_InitStructure.DMA_MemoryBaseAddr  = (uint32_t) &color;
+    DMA_InitStructure.DMA_MemoryInc  = DMA_MemoryInc_Disable;
+    DMA_Init(DMA1_Channel3, &DMA_InitStructure);  // init the DMA
+    do{
+        if(pixel < 0x10000) {
+            dma_transfer = pixel;
+            pixel = 0;
+        }
+        else {
+            dma_transfer = 0xffff;
+            pixel = pixel - 0xffff;
+        }
+        DMA_SetCurrDataCounter(DMA1_Channel3, dma_transfer);
+        SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx,ENABLE);
+        DMA_Cmd(DMA1_Channel3, ENABLE);
+        do{
+        }while(DMA_GetCurrDataCounter(DMA1_Channel3) != 0);     // wait for end of transfer
+        DMA_Cmd(DMA1_Channel3, DISABLE);
+    }while(pixel > 0);
+    do{}while((SPI1->SR & 0x80) == 0x80);    // wait for SPI send
+    SPI1->CR1 &= ~(1 << 11);   // switch to 8 bit Mode
     _cs = 1;
     WindowMax();
     return;
@@ -610,11 +668,16 @@
 }
 
 
+
 void SPI_TFT_ILI9341::character(int x, int y, int c)
 {
     unsigned int hor,vert,offset,bpl,j,i,b;
     unsigned char* zeichen;
     unsigned char z,w;
+    unsigned int pixel;
+    unsigned int p;
+    unsigned int dma_count,dma_off;
+    uint16_t *buffer;
 
     if ((c < 31) || (c > 127)) return;   // test char range
 
@@ -633,36 +696,69 @@
     }
     window(char_x, char_y,hor,vert); // char box
     wr_cmd(0x2C);  // send pixel
-    #ifndef TARGET_KL25Z  // 16 Bit SPI 
-    _spi.format(16,3);   
-    #endif                         // switch to 16 bit Mode 3
-    zeichen = &font[((c -32) * offset) + 4]; // start of char bitmap
-    w = zeichen[0];                          // width of actual char
-     for (j=0; j<vert; j++) {  //  vert line
-        for (i=0; i<hor; i++) {   //  horz line
-            z =  zeichen[bpl * i + ((j & 0xF8) >> 3)+1];
-            b = 1 << (j & 0x07);
-            if (( z & b ) == 0x00) {
-               #ifndef TARGET_KL25Z  // 16 Bit SPI 
-                _spi.write(_background);
-               #else
-                _spi.write(_background >> 8);
-                _spi.write(_background & 0xff);
-                #endif
-            } else {
-                #ifndef TARGET_KL25Z  // 16 Bit SPI
-                _spi.write(_foreground);
-                #else
-                _spi.write(_foreground >> 8);
-                _spi.write(_foreground & 0xff);
-                #endif
+    pixel = hor * vert;  // calculate buffer size
+    SPI1->CR1 |= 1 << 11;   // switch to 16 bit Mode
+    buffer = (uint16_t *) malloc (2*pixel); // we need a buffer for the 16 bit
+    if (buffer == NULL) {                   // there is no space
+        zeichen = &font[((c -32) * offset) + 4]; // start of char bitmap
+        w = zeichen[0];                          // width of actual char
+        for (j=0; j<vert; j++) {  //  vert line
+            for (i=0; i<hor; i++) {   //  horz line
+                z =  zeichen[bpl * i + ((j & 0xF8) >> 3)+1];
+                b = 1 << (j & 0x07);
+                if (( z & b ) == 0x00) {
+                  _spi.write(_background);
+                } else {
+                  _spi.write(_foreground);
+                }
             }
         }
+        _cs = 1;
+    _spi.format(8,3);
+    }
+    else{  // malloc ok, we can use DMA
+        zeichen = &font[((c -32) * offset) + 4]; // start of char bitmap
+        w = zeichen[0];                          // width of actual char
+        p = 0;
+        // construct the char into the buffer
+        for (j=0; j<vert; j++) {  //  vert line
+            for (i=0; i<hor; i++) {   //  horz line
+                z =  zeichen[bpl * i + ((j & 0xF8) >> 3)+1];
+                b = 1 << (j & 0x07);
+                if (( z & b ) == 0x00) {
+                    buffer[p] = _background;
+                } else {
+                    buffer[p] = _foreground;
+                }
+                p++;
+            }
+        }
+        // copy the buffer with DMA SPI to display
+        dma_off = 0;  // offset for DMA transfer
+        DMA_InitStructure.DMA_MemoryBaseAddr  = (uint32_t)  (buffer + dma_off);
+        DMA_InitStructure.DMA_MemoryInc  = DMA_MemoryInc_Enable;
+        DMA_Init(DMA1_Channel3, &DMA_InitStructure);  // init the DMA
+        // start DMA
+         do {
+            if (pixel > 0X10000) {         // this is a giant font !
+                dma_count = 0Xffff;
+                pixel = pixel - 0Xffff;
+            } else {
+                dma_count = pixel;
+                pixel = 0;
+            }
+            DMA_SetCurrDataCounter(DMA1_Channel3, dma_count);
+            SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx,ENABLE);
+            DMA_Cmd(DMA1_Channel3, ENABLE);
+            do{
+              }while(DMA_GetCurrDataCounter(DMA1_Channel3) != 0);     // wait for end of transfer
+            DMA_Cmd(DMA1_Channel3, DISABLE);
+        }while(pixel > 0);
+        do{}while(SPI1->SR & 0x80 == 1);    // wait for SPI send
+        free ((uint16_t *) buffer);
+        SPI1->CR1 &= ~(1 << 11);   // switch to 8 bit Mode
     }
     _cs = 1;
-    #ifndef TARGET_KL25Z  // 16 Bit SPI
-    _spi.format(8,3);
-    #endif
     WindowMax();
     if ((w + 2) < hor) {                   // x offset to next char
         char_x += w + 2;
@@ -682,12 +778,9 @@
     unsigned int  j;
     int padd;
     unsigned short *bitmap_ptr = (unsigned short *)bitmap;
-    #if defined TARGET_KL25Z  // 8 Bit SPI
-        unsigned short pix_temp;
-    #endif
-    
+
     unsigned int i;
-    
+
     // the lines are padded to multiple of 4 bytes in a bitmap
     padd = -1;
     do {
@@ -696,28 +789,17 @@
     window(x, y, w, h);
     bitmap_ptr += ((h - 1)* (w + padd));
     wr_cmd(0x2C);  // send pixel
-    #ifndef TARGET_KL25Z  // 16 Bit SPI 
     _spi.format(16,3);
-    #endif                            // switch to 16 bit Mode 3
     for (j = 0; j < h; j++) {         //Lines
         for (i = 0; i < w; i++) {     // one line
-            #if defined TARGET_KL25Z  // 8 Bit SPI
-                pix_temp = *bitmap_ptr;
-                _spi.write(pix_temp >> 8);
-                _spi.write(pix_temp);
-                bitmap_ptr++;
-            #else
                 _spi.write(*bitmap_ptr);    // one line
                 bitmap_ptr++;
-            #endif
         }
         bitmap_ptr -= 2*w;
         bitmap_ptr -= padd;
     }
     _cs = 1;
-    #ifndef TARGET_KL25Z  // 16 Bit SPI 
     _spi.format(8,3);
-    #endif
     WindowMax();
 }
 
@@ -746,8 +828,8 @@
     while (*Name_BMP!='\0') {
         filename[i++]=*Name_BMP++;
     }
-    filename[i] = 0;  
-    
+    filename[i] = 0;
+
     FILE *Image = fopen((const char *)&filename[0], "rb");  // open the bmp file
     if (!Image) {
         return(0);      // error file not found !
@@ -788,21 +870,14 @@
 
     window(x, y,PixelWidth ,PixelHeigh);
     wr_cmd(0x2C);  // send pixel
-    #ifndef TARGET_KL25Z // only 8 Bit SPI 
-    _spi.format(16,3);  
-    #endif                          // switch to 16 bit Mode 3
+    _spi.format(16,3);
     for (j = PixelHeigh - 1; j >= 0; j--) {               //Lines bottom up
         off = j * (PixelWidth  * 2 + padd) + start_data;   // start of line
         fseek(Image, off ,SEEK_SET);
-        fread(line,1,PixelWidth * 2,Image);       // read a line - slow 
+        fread(line,1,PixelWidth * 2,Image);       // read a line - slow
         for (i = 0; i < PixelWidth; i++) {        // copy pixel data to TFT
-        #ifndef TARGET_KL25Z // only 8 Bit SPI
             _spi.write(line[i]);                  // one 16 bit pixel
-        #else  
-            _spi.write(line[i] >> 8);
-            _spi.write(line[i]);
-        #endif    
-        } 
+        }
      }
     _cs = 1;
     _spi.format(8,3);