ILI9225 lcd driver: writes one row at a time: a lot faster when using SPI DMA.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@4469 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/bertos/drv/lcd_ili9225.c b/bertos/drv/lcd_ili9225.c
index bcfdf8126fb1a7bd732d53dea7027319008e41de..5594dc969e11fe253d6a8462286ea2ea5dca0033 100644 (file)
--- a/bertos/drv/lcd_ili9225.c
+++ b/bertos/drv/lcd_ili9225.c
@@ -30,7 +30,7 @@
  *
  * -->
  *
- * \brief ILI9225B 176x220 graphic driver
+ * \brief ILI9225B 4 wire interface graphic driver
  *
  * \author Stefano Fedrigo <aleph@develer.com>
  *
@@ -73,10 +73,18 @@
 
 #include <drv/timer.h>
 #include <io/kfile.h>
+#include <cpu/byteorder.h>
 
 
 static struct KFile *spi;
 
+/*
+ * Display row buffer.  When refreshing display one full row of
+ * graphics data is transferred with DMA, to speed up transfer and
+ * reduce CPU usage.
+ */
+static uint16_t lcd_row[LCD_WIDTH];
+
 
 struct lcd_ili9225_reg
 {
@@ -136,23 +144,21 @@ static void lcd_cmd(uint8_t cmd)
        kfile_write(spi, &cmd, sizeof(cmd));
 }
 
-static void lcd_data(uint16_t data)
+static void lcd_data(uint16_t *data, size_t count)
 {
-       char bytes[2];
-       bytes[0] = data >> 8;
-       bytes[1] = data & 0xFF;
-
        kfile_flush(spi);
        LCD_RS_HIGH();
-       kfile_write(spi, bytes, 2);
+       kfile_write(spi, data, count*2);
        kfile_flush(spi);
        LCD_CS_HIGH();
 }
 
 static void lcd_regWrite(uint8_t reg, uint16_t data)
 {
+       uint16_t word = cpu_to_be16(data);
+
        lcd_cmd(reg);
-       lcd_data(data);
+       lcd_data(&word, 1);
 }
 
 static void lcd_startBlit(uint8_t x, uint8_t y, uint8_t width, uint8_t height)
@@ -184,7 +190,6 @@ void lcd_ili9225_blitRaw(UNUSED_ARG(const uint8_t *, data),
  */
 void lcd_ili9225_blitBitmap(const Bitmap *bm)
 {
-       //uint16_t lcd_row[bm->width];
        uint8_t mask;
        int i, l, r;
 
@@ -197,10 +202,12 @@ void lcd_ili9225_blitBitmap(const Bitmap *bm)
                        for (i = 0; i < bm->width; i++)
                        {
                                if (bm->raster[l * bm->width + i] & mask)
-                                       lcd_regWrite(0x22, 0xffff);
+                                       lcd_row[i] = 0x0000;
                                else
-                                       lcd_regWrite(0x22, 0x0000);
+                                       lcd_row[i] = 0xFFFF;
                        }
+                       lcd_cmd(0x22);
+                       lcd_data(lcd_row, bm->width);
                }
        }
 
@@ -209,10 +216,12 @@ void lcd_ili9225_blitBitmap(const Bitmap *bm)
                for (i = 0; i < bm->width; i++)
                {
                        if (bm->raster[l * bm->width + i] & mask)
-                               lcd_regWrite(0x22, 0xffff);
+                               lcd_row[i] = 0x0000;
                        else
-                               lcd_regWrite(0x22, 0x0000);
+                               lcd_row[i] = 0xFFFF;
                }
+               lcd_cmd(0x22);
+               lcd_data(lcd_row, bm->width);
        }
 }
 

diff --git a/bertos/drv/lcd_ili9225.h b/bertos/drv/lcd_ili9225.h
index 8df00aa18cf2bd5a679272fbcf7ef6810b4848e6..4484ebf92608ee89034e84578b3c7cdafbbabcbc 100644 (file)
--- a/bertos/drv/lcd_ili9225.h
+++ b/bertos/drv/lcd_ili9225.h
@@ -30,7 +30,7 @@
  *
  * -->
  *
- * \brief ILI9225B 176x220 graphic driver
+ * \brief ILI9225B 4 wire interface graphic driver
  *
  * $WIZ$ module_name = "lcd_ili9225"
  * $WIZ$ module_hw = "bertos/hw/hw_ili9225.h"