Diff: EA_QVGALCD.cpp
- Revision:
- 0:cc002f2fad97
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/EA_QVGALCD.cpp Tue Sep 15 10:02:04 2009 +0000
@@ -0,0 +1,184 @@
+/* mbed Embedded Artists QVGA LCD Display Library
+ * Copyright (c) 2007-2009 sford
+ * Released under the MIT License: http://mbed.org/license/mit
+ */
+
+#include "EA_QVGALCD.h"
+
+EA_QVGALCD::EA_QVGALCD(PinName mosi, PinName miso, PinName sclk, PinName cs, PinName rst) : _spi(mosi, miso, sclk), _cs(cs), _rst(rst) {
+
+ _spi.frequency(15000000);
+ _spi.format(9);
+ _cs = 1;
+ _rst = 0;
+ wait(0.001);
+ _rst = 1;
+ wait(0.001);
+
+// 3-wire SPI Format (see 7.1 c)
+// =================
+//
+// The 3-wire spi format uses 9-bit messages of the form:
+//
+// [Data/nControl D7 D6 D5 D4 D3 D2 D1 D0]
+// (first) (last)
+//
+// Most commands and data are 16-bit, so are achieved by sending two
+// command messages, [ CommandMSB | CommandLSB ], or two data messages
+// [ DataMSB | DataLSB ].
+//
+// Controlling the Display
+// =======================
+//
+// The Index Register is used to setup which configuration register is
+// modified. This address is changed by sending a command message:
+//
+// command [ 0 | index[7:0] ]
+//
+// The data that follows update the register.
+//
+//
+// 0x07 - Display Control
+// ======================
+//
+// [ 0 0 0 PT1 PT0 VLE2 VLE1 SPT | 0 0 GON DTE CM 0 D1 D0 ]
+// where:
+// PT[1:0] - ? (0)
+// VLE[2:1] - ? (0)
+// SPT - ? (0)
+// CM - 8 colour mode enable
+// GON - 0 = Gate-off level VGH
+// DTE - 0 = All gate outputs become VGL
+// 1 = Selected gate outputs become VGH
+// D[1:0] - D1 = Display enable
+// D0 = Display operating
+
+// 15.5 On Sequence
+//
+// -> Set R07h: GON =1, DTE = 0, D[1:0] = 01
+ _cs = 0;
+ config(0x7
+ , 1 << 5 // GON
+ | 0 << 4 // DTE
+ | 0 << 3 // CM
+ | 1 << 0 // D[1:0] = 01 - operate, but disp off
+ );
+// -> Set R00h to 0001h
+// R00h [ 00000000 | 0000000 OSCEN ]
+// OSCEN - 1 = oscillator enabled
+
+ config(0x0, 1);
+
+// -> Set R07h: GON = 1, DTE = 0, D[1:0] = 11
+
+ config(0x7
+ , 1 << 5 // GON
+ | 1 << 4 // DTE
+ | 0 << 3 // CM
+ | 3 << 0 // D[1:0] = 3 - operate, display on
+ );
+
+// -> Set R10h at 0000h : Exit sleep mode
+// R10h [ 00000000 | 0000000 SLP ]
+// SLP = enter sleep mode (retain but no function)
+
+ config(0x10, 0);
+
+// -> wait 30ms
+ wait(0.030);
+
+// -> LCD driver AC setting (R02h)
+ config(0x02, 0x0600);
+ config(0x01, 0x2b3f); // 1011
+ config(0x25, 0xa000); // 70Hz freq
+
+// -> Entry Mode setting (R11h)
+// R11h [ VSMode DFM1 DFM0 TRANS OEDef WMode DMode1 DMode0 | TY1 TY0 ID1 ID0 AM LG2 LG1 LG0 ]
+// VSMode = freq dependant on VSYNC
+// DFM[1:0] colour display mode 11 - 65k, 10 - 262k
+// TRANS - allow transparent display
+// OEDef:
+// When OEDef = 1, OE defines the display window.
+// When OEDef = 0, the display window is defined by R4Eh and R4Fh.
+// WMode: Select the source of data to write in the RAM.
+// 0 Normal data bus (POR)
+// 1 Generic interface
+// Dmode - where to show from (0 = ram)
+// TY - 262k mode options
+// ID[1:0] [ VERTICAL HORIZONTAL ] increment = 1 decrement = 0
+// AM - 0 = horizontal display, 1 = vertical
+// LG - do maths n written data
+
+ config(0x11
+ , 0 << 15 // VSMode
+ | 3 << 13 // DFM[1:0]
+ | 0 << 12 // TRANS
+ | 1 << 11 // OEDef
+ | 0 << 10 // WMode
+ | 0 << 8 // DMode[1:0]
+ | 0 << 6 // TY[1:0]
+ | 3 << 4 // ID[1:0]
+ | 0 << 3 // AM
+ | 0 << 0 // LG[2:0]
+ );
+ _cs = 1;
+
+ cls();
+}
+
+void EA_QVGALCD::pixel(int x, int y, int colour) {
+ window(x, y, 1, 1);
+ putp(colour);
+}
+
+int EA_QVGALCD::width() { return 240; }
+int EA_QVGALCD::height() { return 320; }
+
+
+void EA_QVGALCD::command(int value) {
+ _spi.write(value & 0xFF);
+}
+
+void EA_QVGALCD::data(int value) {
+ _spi.write(value | 0x100);
+}
+
+void EA_QVGALCD::config(int index, int value) {
+ command(0);
+ command(index);
+ data(value >> 8);
+ data(value);
+}
+
+
+void EA_QVGALCD::window(int x, int y, int w, int h) {
+ _cs = 0;
+
+ int hstart = x;
+ int hend = x + w - 1;
+ int vstart = y;
+ int vend = y + h - 1;
+ config(0x44, (hend << 8) | hstart);
+ config(0x45, vstart);
+ config(0x46, vend);
+
+ config(0x4E, hstart & 0xFF);
+ config(0x4F, vstart & 0x1FF);
+ command(0);
+ command(0x22);
+
+ _cs = 1;
+}
+
+void EA_QVGALCD::putp(int colour) {
+ _cs = 0;
+ int top = ((colour >> (8+8)) & 0xF8) // r7-3
+ | ((colour >> (5+8)) & 0x07); // g7-5
+ int bottom = ((colour >> 5) & 0xE0) // g4-2
+ | ((colour >> 3) & 0x1F); // b7-3
+
+ data(top);
+ data(bottom);
+ _cs = 1;
+}
+
Simon Ford