Diff: SPI_TFT_ILI9341_NUCLEO.cpp

Revision:

12:98cc5c193ecd

Child:

17:8794e2eadd8d

diff -r 59eca2723ec5 -r 98cc5c193ecd SPI_TFT_ILI9341_NUCLEO.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SPI_TFT_ILI9341_NUCLEO.cpp	Wed Jun 25 07:54:58 2014 +0000
@@ -0,0 +1,1048 @@
+/* mbed library for 240*320 pixel display TFT based on ILI9341 LCD Controller
+ * Copyright (c) 2013, 2014 Peter Drescher - DC2PD
+ * Special version for STM Nucleo -L152
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+ // 24.06.14   initial version
+ // 25.06.14   add Nucleo F103RB 
+
+// only include this file if target is L152 or F103RB : 
+#if defined TARGET_NUCLEO_L152RE || defined TARGET_NUCLEO_F103RB
+
+#include "SPI_TFT_ILI9341.h"
+#include "mbed.h"
+
+#if defined TARGET_NUCLEO_L152RE
+#include "stm32l1xx_dma.h"
+#define use_ram
+#endif
+
+#if defined TARGET_NUCLEO_F103RB
+#include "stm32f10x_dma.h"
+#endif
+
+#define BPP         16                  // Bits per pixel
+
+//extern Serial pc;
+//extern DigitalOut xx;     // debug !!
+
+DMA_InitTypeDef DMA_InitStructure; 
+
+
+SPI_TFT_ILI9341::SPI_TFT_ILI9341(PinName mosi, PinName miso, PinName sclk, PinName cs, PinName reset, PinName dc, const char *name)
+    : GraphicsDisplay(name), SPI(mosi,miso,sclk,NC), _cs(cs), _reset(reset), _dc(dc)
+{
+
+    format(8,3);                 // 8 bit spi mode 3
+    frequency(10000000);         // 10 Mhz SPI clock : result 2 / 4 = 8
+    orientation = 0;
+    char_x = 0;
+    if(_spi.spi == SPI_1){       // test which SPI is in use
+         spi_num = 1;
+    }
+    if(_spi.spi == SPI_2){
+         spi_num = 2;
+    }
+    #ifdef SPI_3                // there is no SPI 3 on all devices
+    if(_spi.spi == SPI_3){
+         spi_num = 3;
+    }
+    #endif
+    tft_reset();
+}
+
+// we define a fast write to the SPI port
+// we use the bit banding address to get the flag without masking
+
+#define bit_SPI1_txe  *((volatile unsigned int *)0x42260104)
+#define SPI1_DR       *((volatile unsigned int *)0x4001300C)
+#define bit_SPI2_txe  *((volatile unsigned int *)0x42070104)
+#define SPI2_DR       *((volatile unsigned int *)0x4000380C)
+#define bit_SPI3_txe  *((volatile unsigned int *)0x42078104)
+#define SPI3_DR       *((volatile unsigned int *)0x40003C0C)
+
+void SPI_TFT_ILI9341::f_write(int data){
+
+switch(spi_num){  // used SPI port
+case (1):
+    while(bit_SPI1_txe == 0);  // wait for SPI1->SR TXE flag
+    SPI1_DR = data;
+    break;
+
+case (2):
+    while( bit_SPI2_txe  == 0);  // wait for SPI2->SR TXE flag
+    SPI2_DR = data;
+    break;
+
+case (3):
+    while( bit_SPI3_txe == 0);  // wait for SPI3->SR TXE flag
+    SPI3_DR = data;
+    break;
+
+    }
+}
+
+// wait for SPI not busy
+// we have to wait for the last bit to switch the cs off
+// we use the bit banding address to get the flag without masking
+
+#define bit_SPI1_bsy  *((volatile unsigned int *)0x4226011C)
+#define bit_SPI2_bsy  *((volatile unsigned int *)0x4207011C)
+#define bit_SPI3_bsy  *((volatile unsigned int *)0x4207811C)
+
+void inline SPI_TFT_ILI9341::spi_bsy(void){    
+switch(spi_num){        // decide which SPI is to use
+case (1):
+    while(bit_SPI1_bsy == 1);   // SPI1->SR bit 7
+    break;
+
+case (2):
+    while(bit_SPI2_bsy == 1);   // SPI2->SR bit 7
+    break;
+
+case (3):
+    while(bit_SPI3_bsy == 1);   // SPI2->SR bit 7
+    break;
+    }
+}
+
+
+// switch fast between 8 and 16 bit mode
+#define bit_SPI1_dff  *((volatile unsigned int *)0x4226002C)
+#define bit_SPI2_dff  *((volatile unsigned int *)0x4207002C)
+#define bit_SPI3_dff  *((volatile unsigned int *)0x4207802C)
+void SPI_TFT_ILI9341::spi_16(bool s){
+switch(spi_num){        // decide which SPI is to use
+case(1):
+    if(s) bit_SPI1_dff = 1; // switch to 16 bit Mode
+    else  bit_SPI1_dff = 0; // switch to 8  bit Mode
+    break;
+
+case(2):
+    if(s) bit_SPI2_dff = 1; // switch to 16 bit Mode
+    else  bit_SPI2_dff = 0; // switch to 8  bit Mode
+    break;
+
+case(3):
+    if(s) bit_SPI3_dff = 1; // switch to 16 bit Mode
+    else  bit_SPI3_dff = 0; // switch to 8  bit Mode
+    break;
+    }
+}
+
+
+int SPI_TFT_ILI9341::width()
+{
+    if (orientation == 0 || orientation == 2) return 240;
+    else return 320;
+}
+
+
+int SPI_TFT_ILI9341::height()
+{
+    if (orientation == 0 || orientation == 2) return 320;
+    else return 240;
+}
+
+
+void SPI_TFT_ILI9341::set_orientation(unsigned int o)
+{
+    orientation = o;
+    wr_cmd(0x36);                     // MEMORY_ACCESS_CONTROL
+    switch (orientation) {
+        case 0:
+            f_write(0x48);
+            break;
+        case 1:
+            f_write(0x28);
+            break;
+        case 2:
+            f_write(0x88);
+            break;
+        case 3:
+            f_write(0xE8);
+            break;
+    }
+    spi_bsy();    // wait for end of transfer
+    _cs = 1;
+    WindowMax();
+}
+
+
+// write command to tft register
+// use fast command
+void SPI_TFT_ILI9341::wr_cmd(unsigned char cmd)
+{
+    _dc = 0;
+    _cs = 0;
+    f_write(cmd);
+    spi_bsy();
+    _dc = 1;
+}
+
+void SPI_TFT_ILI9341::wr_dat(unsigned char dat)
+{
+   f_write(dat);
+   spi_bsy();  // wait for SPI send
+}
+
+// the ILI9341 can read
+char SPI_TFT_ILI9341::rd_byte(unsigned char cmd)
+{
+    // has to change !!
+    return(0);
+}
+
+// read 32 bit
+int SPI_TFT_ILI9341::rd_32(unsigned char cmd)
+{
+    // has to change !!!
+    return(0);
+}
+
+int  SPI_TFT_ILI9341::Read_ID(void){
+    int r;
+    r = rd_byte(0x0A);
+    r = rd_byte(0x0A);
+    r = rd_byte(0x0A);
+    r = rd_byte(0x0A);
+    return(r);
+}
+
+
+// Init code based on MI0283QT datasheet
+// this code is called only at start
+// no need to be optimized
+
+void SPI_TFT_ILI9341::tft_reset()
+{
+    _cs = 1;                           // cs 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
+    wait_ms(5);
+    wr_cmd(0x28);                     // display off
+
+    /* Start Initial Sequence ----------------------------------------------------*/
+    wr_cmd(0xCF);
+    f_write(0x00);
+    f_write(0x83);
+    f_write(0x30);
+    spi_bsy();
+     _cs = 1;
+
+     wr_cmd(0xED);
+     f_write(0x64);
+     f_write(0x03);
+     f_write(0x12);
+     f_write(0x81);
+     spi_bsy();
+     _cs = 1;
+
+     wr_cmd(0xE8);
+     f_write(0x85);
+     f_write(0x01);
+     f_write(0x79);
+     spi_bsy();
+     _cs = 1;
+
+     wr_cmd(0xCB);
+     f_write(0x39);
+     f_write(0x2C);
+     f_write(0x00);
+     f_write(0x34);
+     f_write(0x02);
+     spi_bsy();
+     _cs = 1;
+
+     wr_cmd(0xF7);
+     f_write(0x20);
+     spi_bsy();
+     _cs = 1;
+
+     wr_cmd(0xEA);
+     f_write(0x00);
+     f_write(0x00);
+     spi_bsy();
+     _cs = 1;
+
+     wr_cmd(0xC0);                     // POWER_CONTROL_1
+     f_write(0x26);
+     spi_bsy();
+     _cs = 1;
+
+     wr_cmd(0xC1);                     // POWER_CONTROL_2
+     f_write(0x11);
+     spi_bsy();
+     _cs = 1;
+
+     wr_cmd(0xC5);                     // VCOM_CONTROL_1
+     f_write(0x35);
+     f_write(0x3E);
+     spi_bsy();
+     _cs = 1;
+
+     wr_cmd(0xC7);                     // VCOM_CONTROL_2
+     f_write(0xBE);
+     spi_bsy();
+     _cs = 1;
+
+     wr_cmd(0x36);                     // MEMORY_ACCESS_CONTROL
+     f_write(0x48);
+     spi_bsy();
+     _cs = 1;
+
+     wr_cmd(0x3A);                     // COLMOD_PIXEL_FORMAT_SET
+     f_write(0x55);                 // 16 bit pixel
+     spi_bsy();
+     _cs = 1;
+
+     wr_cmd(0xB1);                     // Frame Rate
+     f_write(0x00);
+     f_write(0x1B);
+     spi_bsy();
+     _cs = 1;
+
+     wr_cmd(0xF2);                     // Gamma Function Disable
+     f_write(0x08);
+     spi_bsy();
+     _cs = 1;
+
+     wr_cmd(0x26);
+     f_write(0x01);                 // gamma set for curve 01/2/04/08
+     spi_bsy();
+     _cs = 1;
+
+     wr_cmd(0xE0);                     // positive gamma correction
+     f_write(0x1F);
+     f_write(0x1A);
+     f_write(0x18);
+     f_write(0x0A);
+     f_write(0x0F);
+     f_write(0x06);
+     f_write(0x45);
+     f_write(0x87);
+     f_write(0x32);
+     f_write(0x0A);
+     f_write(0x07);
+     f_write(0x02);
+     f_write(0x07);
+     f_write(0x05);
+     f_write(0x00);
+     spi_bsy();
+     _cs = 1;
+
+     wr_cmd(0xE1);                     // negativ gamma correction
+     f_write(0x00);
+     f_write(0x25);
+     f_write(0x27);
+     f_write(0x05);
+     f_write(0x10);
+     f_write(0x09);
+     f_write(0x3A);
+     f_write(0x78);
+     f_write(0x4D);
+     f_write(0x05);
+     f_write(0x18);
+     f_write(0x0D);
+     f_write(0x38);
+     f_write(0x3A);
+     f_write(0x1F);
+     spi_bsy();
+     _cs = 1;
+
+     WindowMax ();
+
+     //wr_cmd(0x34);                     // tearing effect off
+     //_cs = 1;
+
+     //wr_cmd(0x35);                     // tearing effect on
+     //_cs = 1;
+
+     wr_cmd(0xB7);                       // entry mode
+     f_write(0x07);
+     spi_bsy();
+     _cs = 1;
+
+     wr_cmd(0xB6);                       // display function control
+     f_write(0x0A);
+     f_write(0x82);
+     f_write(0x27);
+     f_write(0x00);
+     spi_bsy();
+     _cs = 1;
+
+     wr_cmd(0x11);                     // sleep out
+     spi_bsy();
+     _cs = 1;
+
+     wait_ms(100);
+
+     wr_cmd(0x29);                     // display on
+     spi_bsy();
+     _cs = 1;
+
+     wait_ms(100);
+
+    //    Configure the DMA controller init-structure
+    DMA_StructInit(&DMA_InitStructure);
+    switch(spi_num){        // decide which SPI is to use
+    case (1):
+        RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);    // SPI1 and SPI2 are using DMA 1
+        DMA_InitStructure.DMA_PeripheralBaseAddr  = (uint32_t) &(SPI1->DR);
+        break;
+    case (2):
+        RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);    // SPI1 and SPI2 are using DMA 1
+        DMA_InitStructure.DMA_PeripheralBaseAddr  = (uint32_t) &(SPI2->DR);
+        break;
+    case (3):
+        RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);    // SPI3 is using DMA 2
+        DMA_InitStructure.DMA_PeripheralBaseAddr  = (uint32_t) &(SPI3->DR);
+        break;
+    }
+    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_16(1);         // switch to 8 bit Mode
+    f_write(x);
+    spi_bsy();
+    _cs = 1;
+
+    spi_16(0);        // switch to 8 bit Mode
+    wr_cmd(0x2B);
+    spi_16(1);
+    f_write(y);
+    spi_bsy();
+    _cs = 1;
+    spi_16(0);
+
+    wr_cmd(0x2C); // send pixel
+    spi_16(1);
+    f_write(color);
+    spi_bsy();
+    _cs = 1;
+    spi_16(0);
+}
+
+// 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_16(1);
+    f_write(x);
+    f_write(x+w-1);
+    spi_bsy();
+    _cs = 1;
+    spi_16(0);
+
+    wr_cmd(0x2B);
+    spi_16(1);
+    f_write(y) ;
+    f_write(y+h-1);
+    spi_bsy();
+    _cs = 1;
+    spi_16(0);
+}
+
+
+void SPI_TFT_ILI9341::WindowMax (void)
+{
+    window (0, 0, width(),  height());
+}
+
+// optimized
+// use DMA to transfer pixel data to the screen
+void SPI_TFT_ILI9341::cls (void)
+{
+    // we can use the fillrect function 
+   fillrect(0,0,width()-1,height()-1,_background);
+}    
+
+void SPI_TFT_ILI9341::circle(int x0, int y0, int r, int color)
+{
+
+    int x = -r, y = 0, err = 2-2*r, e2;
+    do {
+        pixel(x0-x, y0+y,color);
+        pixel(x0+x, y0+y,color);
+        pixel(x0+x, y0-y,color);
+        pixel(x0-x, y0-y,color);
+        e2 = err;
+        if (e2 <= y) {
+            err += ++y*2+1;
+            if (-x == y && e2 <= x) e2 = 0;
+        }
+        if (e2 > x) err += ++x*2+1;
+    } while (x <= 0);
+}
+
+void SPI_TFT_ILI9341::fillcircle(int x0, int y0, int r, int color)
+{
+    int x = -r, y = 0, err = 2-2*r, e2;
+    do {
+        vline(x0-x, y0-y, y0+y, color);
+        vline(x0+x, y0-y, y0+y, color);
+        e2 = err;
+        if (e2 <= y) {
+            err += ++y*2+1;
+            if (-x == y && e2 <= x) e2 = 0;
+        }
+        if (e2 > x) err += ++x*2+1;
+    } while (x <= 0);
+}
+
+
+// optimized for speed
+void SPI_TFT_ILI9341::hline(int x0, int x1, int y, int color)
+{
+    int w,j;
+    w = x1 - x0 + 1;
+    window(x0,y,w,1);
+    _dc = 0;
+    _cs = 0;
+    f_write(0x2C); // send pixel
+    spi_bsy();
+    _dc = 1;
+    spi_16(1);
+
+    for (j=0; j<w; j++) {
+        f_write(color);
+    }
+    spi_bsy();
+    spi_16(0);
+    _cs = 1;
+    WindowMax();
+    return;
+}
+
+// optimized for speed
+void SPI_TFT_ILI9341::vline(int x, int y0, int y1, int color)
+{
+    int h,y;
+    h = y1 - y0 + 1;
+    window(x,y0,1,h);
+    _dc = 0;
+    _cs = 0;
+    f_write(0x2C); // send pixel
+    spi_bsy();
+    _dc = 1;
+    spi_16(1);
+                // switch to 16 bit Mode 3
+    for (y=0; y<h; y++) {
+        f_write(color);
+    }
+    spi_bsy();
+    spi_16(0);
+    _cs = 1;
+    WindowMax();
+    return;
+}
+
+
+void SPI_TFT_ILI9341::line(int x0, int y0, int x1, int y1, int color)
+{
+    //WindowMax();
+    int   dx = 0, dy = 0;
+    int   dx_sym = 0, dy_sym = 0;
+    int   dx_x2 = 0, dy_x2 = 0;
+    int   di = 0;
+
+    dx = x1-x0;
+    dy = y1-y0;
+
+    if (dx == 0) {        /* vertical line */
+        if (y1 > y0) vline(x0,y0,y1,color);
+        else vline(x0,y1,y0,color);
+        return;
+    }
+
+    if (dx > 0) {
+        dx_sym = 1;
+    } else {
+        dx_sym = -1;
+    }
+    if (dy == 0) {        /* horizontal line */
+        if (x1 > x0) hline(x0,x1,y0,color);
+        else  hline(x1,x0,y0,color);
+        return;
+    }
+
+    if (dy > 0) {
+        dy_sym = 1;
+    } else {
+        dy_sym = -1;
+    }
+
+    dx = dx_sym*dx;
+    dy = dy_sym*dy;
+
+    dx_x2 = dx*2;
+    dy_x2 = dy*2;
+
+    if (dx >= dy) {
+        di = dy_x2 - dx;
+        while (x0 != x1) {
+
+            pixel(x0, y0, color);
+            x0 += dx_sym;
+            if (di<0) {
+                di += dy_x2;
+            } else {
+                di += dy_x2 - dx_x2;
+                y0 += dy_sym;
+            }
+        }
+        pixel(x0, y0, color);
+    } else {
+        di = dx_x2 - dy;
+        while (y0 != y1) {
+            pixel(x0, y0, color);
+            y0 += dy_sym;
+            if (di < 0) {
+                di += dx_x2;
+            } else {
+                di += dx_x2 - dy_x2;
+                x0 += dx_sym;
+            }
+        }
+        pixel(x0, y0, color);
+    }
+    return;
+}
+
+
+void SPI_TFT_ILI9341::rect(int x0, int y0, int x1, int y1, int color)
+{
+
+    if (x1 > x0) hline(x0,x1,y0,color);
+    else  hline(x1,x0,y0,color);
+
+    if (y1 > y0) vline(x0,y0,y1,color);
+    else vline(x0,y1,y0,color);
+
+    if (x1 > x0) hline(x0,x1,y1,color);
+    else  hline(x1,x0,y1,color);
+
+    if (y1 > y0) vline(x1,y0,y1,color);
+    else vline(x1,y1,y0,color);
+
+    return;
+}
+
+
+
+// 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
+    spi_16(1);
+    DMA_InitStructure.DMA_MemoryBaseAddr  = (uint32_t) &color;
+    DMA_InitStructure.DMA_MemoryInc  = DMA_MemoryInc_Disable;
+
+    switch(spi_num){        // decide which SPI is to use
+    case (1):
+        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);
+            while(DMA_GetCurrDataCounter(DMA1_Channel3) != 0);     // wait for end of transfer
+            DMA_Cmd(DMA1_Channel3, DISABLE);
+        }while(pixel > 0);
+        break;
+
+    case (2):
+        DMA_Init(DMA1_Channel5, &DMA_InitStructure);  // init the DMA
+        do{
+            if(pixel < 0x10000) {
+                dma_transfer = pixel;
+                pixel = 0;
+            }
+            else {
+                dma_transfer = 0xffff;
+                pixel = pixel - 0xffff;
+            }
+            DMA_SetCurrDataCounter(DMA1_Channel5, dma_transfer);
+            SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Tx,ENABLE);
+            DMA_Cmd(DMA1_Channel5, ENABLE);
+            while(DMA_GetCurrDataCounter(DMA1_Channel5) != 0);     // wait for end of transfer
+            DMA_Cmd(DMA1_Channel5, DISABLE);
+        }while(pixel > 0);
+        break;
+
+    case (3):
+        DMA_Init(DMA2_Channel2, &DMA_InitStructure);  // init the DMA
+        do{
+            if(pixel < 0x10000) {
+                dma_transfer = pixel;
+                pixel = 0;
+            }
+            else {
+                dma_transfer = 0xffff;
+                pixel = pixel - 0xffff;
+            }
+            DMA_SetCurrDataCounter(DMA2_Channel2, dma_transfer);
+            SPI_I2S_DMACmd(SPI3, SPI_I2S_DMAReq_Tx,ENABLE);
+            DMA_Cmd(DMA2_Channel2, ENABLE);
+            while(DMA_GetCurrDataCounter(DMA2_Channel2) != 0);     // wait for end of transfer
+            DMA_Cmd(DMA2_Channel2, DISABLE);
+        }while(pixel > 0);
+        break;
+    }
+    spi_bsy();
+    spi_16(0);
+    _cs = 1;
+    WindowMax();
+    return;
+}
+
+void SPI_TFT_ILI9341::locate(int x, int y)
+{
+    char_x = x;
+    char_y = y;
+}
+
+int SPI_TFT_ILI9341::columns()
+{
+    return width() / font[1];
+}
+
+
+int SPI_TFT_ILI9341::rows()
+{
+    return height() / font[2];
+}
+
+
+int SPI_TFT_ILI9341::_putc(int value)
+{
+    if (value == '\n') {    // new line
+        char_x = 0;
+        char_y = char_y + font[2];
+        if (char_y >= height() - font[2]) {
+            char_y = 0;
+        }
+    } else {
+        character(char_x, char_y, value);
+    }
+    return value;
+}
+
+
+// speed optimized
+// will use dma
+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;
+    #ifdef use_ram
+    unsigned int pixel;
+    unsigned int p;
+    unsigned int dma_count,dma_off;
+    uint16_t *buffer;
+    #endif
+
+    if ((c < 31) || (c > 127)) return;   // test char range
+
+    // read font parameter from start of array
+    offset = font[0];                    // bytes / char
+    hor = font[1];                       // get hor size of font
+    vert = font[2];                      // get vert size of font
+    bpl = font[3];                       // bytes per line
+
+    if (char_x + hor > width()) {
+        char_x = 0;
+        char_y = char_y + vert;
+        if (char_y >= height() - font[2]) {
+            char_y = 0;
+        }
+    }
+    window(char_x, char_y,hor,vert);           // setup char box
+    wr_cmd(0x2C);
+    spi_16(1);                                 // switch to 16 bit Mode
+    #ifdef use_ram
+    pixel = hor * vert;                        // calculate buffer size
+    buffer = (uint16_t *) malloc (2*pixel);    // we need a buffer for the font
+    if(buffer != NULL) {                       // there is memory space -> use dma
+        zeichen = &font[((c -32) * offset) + 4]; // start of char bitmap
+        w = zeichen[0];                          // width of actual char
+        p = 0;
+        // construct the font 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;
+
+        switch(spi_num){        // decide which SPI is to use
+        case (1):
+        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);
+            while(DMA_GetCurrDataCounter(DMA1_Channel3) != 0);     // wait for end of transfer
+            DMA_Cmd(DMA1_Channel3, DISABLE);
+        }while(pixel > 0);
+        break;
+
+        case (2):
+        DMA_Init(DMA1_Channel5, &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_Channel5, dma_count);
+            SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Tx,ENABLE);
+            DMA_Cmd(DMA1_Channel5, ENABLE);
+            while(DMA_GetCurrDataCounter(DMA1_Channel5) != 0);     // wait for end of transfer
+            DMA_Cmd(DMA1_Channel5, DISABLE);
+        }while(pixel > 0);
+        break;
+
+        case (3):
+        DMA_Init(DMA2_Channel2, &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(DMA2_Channel2, dma_count);
+            SPI_I2S_DMACmd(SPI3, SPI_I2S_DMAReq_Tx,ENABLE);
+            DMA_Cmd(DMA2_Channel2, ENABLE);
+            while(DMA_GetCurrDataCounter(DMA2_Channel2) != 0);     // wait for end of transfer
+            DMA_Cmd(DMA2_Channel2, DISABLE);
+        }while(pixel > 0);
+        break;
+
+        }
+        spi_bsy();
+        free ((uint16_t *) buffer);
+        spi_16(0);
+    }
+    
+    else{
+        #endif
+        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) {
+                  f_write(_background);
+                } else {
+                  f_write(_foreground);
+                }
+            }
+        }
+        spi_bsy();
+        _cs = 1;
+        spi_16(0);
+    #ifdef use_ram   
+    }
+    #endif    
+    _cs = 1;
+    WindowMax();
+    if ((w + 2) < hor) {                   // x offset to next char
+        char_x += w + 2;
+    } else char_x += hor;
+}
+
+
+void SPI_TFT_ILI9341::set_font(unsigned char* f)
+{
+    font = f;
+}
+
+
+void SPI_TFT_ILI9341::Bitmap(unsigned int x, unsigned int y, unsigned int w, unsigned int h,unsigned char *bitmap)
+{
+    unsigned int  j;
+    int padd;
+    unsigned short *bitmap_ptr = (unsigned short *)bitmap;
+
+    unsigned int i;
+
+    // the lines are padded to multiple of 4 bytes in a bitmap
+    padd = -1;
+    do {
+        padd ++;
+    } while (2*(w + padd)%4 != 0);
+    window(x, y, w, h);
+    bitmap_ptr += ((h - 1)* (w + padd));
+    wr_cmd(0x2C);  // send pixel
+    spi_16(1);
+    for (j = 0; j < h; j++) {         //Lines
+        for (i = 0; i < w; i++) {     // one line
+                f_write(*bitmap_ptr);    // one line
+                bitmap_ptr++;
+        }
+        bitmap_ptr -= 2*w;
+        bitmap_ptr -= padd;
+    }
+    spi_bsy();
+    _cs = 1;
+    spi_16(0);
+    WindowMax();
+}
+
+
+// local filesystem is not implemented but you can add a SD card to a different SPI
+
+int SPI_TFT_ILI9341::BMP_16(unsigned int x, unsigned int y, const char *Name_BMP)
+{
+
+#define OffsetPixelWidth    18
+#define OffsetPixelHeigh    22
+#define OffsetFileSize      34
+#define OffsetPixData       10
+#define OffsetBPP           28
+
+    char filename[50];
+    unsigned char BMP_Header[54];
+    unsigned short BPP_t;
+    unsigned int PixelWidth,PixelHeigh,start_data;
+    unsigned int    i,off;
+    int padd,j;
+    unsigned short *line;
+
+    // get the filename
+    i=0;
+    while (*Name_BMP!='\0') {
+        filename[i++]=*Name_BMP++;
+    }
+    filename[i] = 0;
+
+    FILE *Image = fopen((const char *)&filename[0], "rb");  // open the bmp file
+    if (!Image) {
+        return(0);      // error file not found !
+    }
+
+    fread(&BMP_Header[0],1,54,Image);      // get the BMP Header
+
+    if (BMP_Header[0] != 0x42 || BMP_Header[1] != 0x4D) {  // check magic byte
+        fclose(Image);
+        return(-1);     // error no BMP file
+    }
+
+    BPP_t = BMP_Header[OffsetBPP] + (BMP_Header[OffsetBPP + 1] << 8);
+    if (BPP_t != 0x0010) {
+        fclose(Image);
+        return(-2);     // error no 16 bit BMP
+    }
+
+    PixelHeigh = BMP_Header[OffsetPixelHeigh] + (BMP_Header[OffsetPixelHeigh + 1] << 8) + (BMP_Header[OffsetPixelHeigh + 2] << 16) + (BMP_Header[OffsetPixelHeigh + 3] << 24);
+    PixelWidth = BMP_Header[OffsetPixelWidth] + (BMP_Header[OffsetPixelWidth + 1] << 8) + (BMP_Header[OffsetPixelWidth + 2] << 16) + (BMP_Header[OffsetPixelWidth + 3] << 24);
+    if (PixelHeigh > height() + y || PixelWidth > width() + x) {
+        fclose(Image);
+        return(-3);      // to big
+    }
+
+    start_data = BMP_Header[OffsetPixData] + (BMP_Header[OffsetPixData + 1] << 8) + (BMP_Header[OffsetPixData + 2] << 16) + (BMP_Header[OffsetPixData + 3] << 24);
+
+    line = (unsigned short *) malloc (2 * PixelWidth); // we need a buffer for a line
+    if (line == NULL) {
+        return(-4);         // error no memory
+    }
+
+    // the bmp lines are padded to multiple of 4 bytes
+    padd = -1;
+    do {
+        padd ++;
+    } while ((PixelWidth * 2 + padd)%4 != 0);
+
+    window(x, y,PixelWidth ,PixelHeigh);
+    wr_cmd(0x2C);  // send pixel
+    spi_16(1);
+    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
+        for (i = 0; i < PixelWidth; i++) {        // copy pixel data to TFT
+            f_write(line[i]);                  // one 16 bit pixel
+        }
+     }
+    spi_bsy();
+    _cs = 1;
+    spi_16(0);
+    free (line);
+    fclose(Image);
+    WindowMax();
+    return(1);
+}
+
+#endif
+