John Durrell / SPI_TFT

Adapted from Peter Dresche's original for Waveshare 2.8inch TFT Touch Shield Board and Mbed 6. RGB order reversed by changing reg 16 commands, spi write code adjusted as there is no reset pin but there is data command pin. Wait commands changed for new thread_sleep style, Stream class explicitly included. Library to control a QVGA TFT connected to SPI. You can use printf to print text The lib can handle different fonts, draw lines, circles, rect and bmp

Files at this revision

API Documentation at this revision

Revision 22:4a0f306be8ef, committed 2020-06-17

Comitter:
jhd25
Date:
Wed Jun 17 22:01:37 2020 +0100
Parent:
21:d7ae9d59eb03
Child:
23:469bf5f3c8ac
Commit message:
Now with mutexes !

Changed in this revision

SPI_TFT.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/SPI_TFT.cpp	Wed Jun 17 20:42:10 2020 +0100
+++ b/SPI_TFT.cpp	Wed Jun 17 22:01:37 2020 +0100
@@ -99,6 +99,7 @@
 
 void SPI_TFT::wr_cmd(unsigned char cmd)
 {
+    _spi.lock();
     _cs = 0;
     #if defined NO_MBED_LIB
         unsigned short spi_d;
@@ -115,23 +116,29 @@
         }
     #else  // use mbed lib
         #if defined TARGET_KL25Z  // 8 Bit SPI
+            
             _spi.write(0x70);
             _spi.write(cmd);
+    
         #else   
             _reset=0;                  // 16 Bit SPI  
             unsigned short spi_d;
             spi_d =  0x7000 | cmd ;
+        
             _spi.write(spi_d);      // mbed lib
+           
             _reset=1;
         #endif
     #endif
     _cs = 1;
+    _spi.unlock();
 }
 
 
 // write data to tft register
 void SPI_TFT::wr_dat(unsigned char dat)
 {
+    _spi.lock();
     _cs = 0;   
     _reset=1; 
     #if defined NO_MBED_LIB
@@ -158,6 +165,7 @@
         #endif
     #endif
     _cs = 1;
+    _spi.unlock();
 }
 
 
@@ -302,7 +310,9 @@
     wr_reg(0x07, (y >> 0));
     wr_reg(0x06, (y >> 8));
     wr_cmd(0x22);
+    _spi.lock();
     _cs = 0;
+
     #if defined NO_MBED_LIB
         if (spi_port == 0) {    // TFT on SSP0
             LPC_SSP0->CR0 &= ~(0x08UL); // set to 8 bit
@@ -335,6 +345,7 @@
         #endif
     #endif
     _cs = 1;
+    _spi.unlock();
 }
 
 // define draw area
@@ -373,6 +384,7 @@
         #if defined USE_DMA
             LPC_GPDMACH0->DMACCSrcAddr = (uint32_t)&color;
         #endif
+        _spi.lock();
         _cs = 0;
         if (spi_port == 0) {    // TFT on SSP0
             #if defined USE_DMA
@@ -431,6 +443,7 @@
         #endif
 
     #else  // use mbed lib
+        _spi.lock();
         _cs = 0;
         #if defined TARGET_KL25Z                          // 8 Bit SPI    
             _spi.write(SPI_START | SPI_WR | SPI_DATA);    // Write : RS = 1, RW = 0
@@ -449,6 +462,7 @@
         #endif
     #endif
     _cs = 1;
+    _spi.unlock();
 }
 
 void SPI_TFT::circle(int x0, int y0, int r, int color)
@@ -492,6 +506,7 @@
     w = x1 - x0 + 1;
     window(x0,y,w,1);
     wr_cmd(0x22);
+    _spi.lock();
     _cs = 0;
     #if defined NO_MBED_LIB
         if (spi_port == 0) {    // TFT on SSP0
@@ -552,6 +567,7 @@
         #endif
     #endif
     _cs = 1;
+    _spi.unlock();
     WindowMax();
     return;
 }
@@ -563,6 +579,7 @@
     h = y1 - y0 + 1;
     window(x,y0,1,h);
     wr_cmd(0x22);
+    _spi.lock();
     _cs = 0;
     #if defined NO_MBED_LIB
         if (spi_port == 0) {    // TFT on SSP0
@@ -623,6 +640,7 @@
         #endif
     #endif
     _cs = 1;
+    _spi.unlock();
     WindowMax();
     return;
 }
@@ -732,6 +750,7 @@
     #endif
     window(x0,y0,w,h);
     wr_cmd(0x22);
+    _spi.lock();
     _cs = 0;
     #if defined NO_MBED_LIB
         if (spi_port == 0) {    // TFT on SSP0
@@ -805,6 +824,7 @@
         #endif
     #endif
     _cs = 1;
+    _spi.unlock();
     WindowMax();
     return;
 }
@@ -904,6 +924,7 @@
 
         // copy the buffer with DMA SPI to display
         dma_off = 0;  // offset for DMA transfer
+        _spi.lock();
         _cs = 0;
         if (spi_port == 0) {    // TFT on SSP0
             LPC_GPDMACH0->DMACCDestAddr = (uint32_t)&LPC_SSP0->DR; // we send to SSP0
@@ -956,6 +977,7 @@
         }
 
     #else  // no dma
+        _spi.lock();
         _cs = 0;
         #if defined NO_MBED_LIB
             if (spi_port == 0) {    // TFT on SSP0
@@ -1002,6 +1024,7 @@
         }
     #endif  // no DMA    
     _cs = 1;
+    _spi.unlock();
     WindowMax();
     if ((w + 2) < hor) {                   // x offset to next char
         char_x += w + 2;
@@ -1032,6 +1055,7 @@
     } while (2*(w + padd)%4 != 0);
     window(x, y, w, h);
     wr_cmd(0x22);
+    _spi.lock();
     _cs = 0;
 #if defined NO_MBED_LIB
     if (spi_port == 0) {    // TFT on SSP0
@@ -1115,6 +1139,7 @@
      }
 #endif // USE MBED LIB
     _cs = 1;
+    _spi.unlock();
     WindowMax();
 }
 
@@ -1192,6 +1217,7 @@
 //fseek(Image, 70 ,SEEK_SET);
     window(x, y,PixelWidth ,PixelHeigh);
     wr_cmd(0x22);
+    _spi.lock();
     _cs = 0;
 #if defined NO_MBED_LIB
     if (spi_port == 0) {    // TFT on SSP0
@@ -1255,6 +1281,7 @@
     }
 #endif
     _cs = 1;
+    _spi.unlock();
     free (line);
     fclose(Image);
     WindowMax();