Diff: lcd_spi.cpp

Revision:

0:ae5037e3d6e0

Child:

1:65f72ed914fa

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lcd_spi.cpp	Mon Nov 15 22:37:30 2010 +0000
@@ -0,0 +1,66 @@
+/*
+ * mbed LCDWindow library
+* Copyright (c) 2010 Hendrik Lipka
+* 
+* Permission is hereby granted, free of charge, to any person obtaining a copy
+* of this software and associated documentation files (the "Software"), to deal
+* in the Software without restriction, including without limitation the rights
+* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+* copies of the Software, and to permit persons to whom the Software is
+* furnished to do so, subject to the following conditions:
+* 
+* The above copyright notice and this permission notice shall be included in
+* all copies or substantial portions of the Software.
+* 
+* 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.
+*/
+
+#include "lcd_spi.h"
+
+#include "SPI.h"
+#include "DigitalOut.h"
+#include "wait_api.h"
+
+SPILCDBase::SPILCDBase
+(unsigned int width, unsigned int height, SPI *spi, PinName enable, PinName rs)
+:TextLCDBase(width,height)
+{
+    _spi=spi;
+    _enable=new DigitalOut(enable);
+    _rs=new DigitalOut(rs);
+    _enable->write(1);
+    _spi->format(8,3); // 8 bits, cpol=1, cpha=1 (should be mode 2, but phase seems inverted)
+    // set SPI frequency at 0.1 MHz
+    _spi->frequency(100000);
+}
+
+void SPILCDBase::sendByte(unsigned char byte)
+{
+    _enable->write(0); // enable transfer
+    wait_us(1);
+    _spi->write(byte); // send byte over wire
+    wait_us(20);
+    _enable->write(1);
+}
+
+void SPILCDBase::sendCmd(unsigned char cmd)
+{
+    _rs->write(0);
+    wait_us(1);
+    sendByte(cmd);
+    wait_us(1);
+    _rs->write(1);
+}
+
+void SPILCDBase::sendData(unsigned char cmd)
+{
+    _rs->write(1);
+    wait_us(1);
+    sendByte(cmd);
+}