Diff: pcd8544_drv.cpp

Revision:

0:358e68b0535a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pcd8544_drv.cpp	Sun Jan 02 11:50:35 2011 +0000
@@ -0,0 +1,144 @@
+/* ********************************************
+* PCD8544 Driver for an LCD with an PCD8544
+* controller.
+* Note: Text mode supported only.
+*
+* Created on: 12/31/2010 at 19:48
+* Created by: CarlosFTM
+********************************************** */
+
+#include "mbed.h"
+#include "pcd8544_drv.hpp"
+
+pcd8544::pcd8544(PinName pin_sclk, PinName pin_mosi, PinName pin_dc, PinName pin_sce, PinName pin_reset) :  _sclk(pin_sclk),
+                                                                                                            _mosi(pin_mosi),
+                                                                                                            _dc(pin_dc),
+                                                                                                            _sce(pin_sce),
+                                                                                                            _reset(pin_reset)
+{
+  /* Set all pins to initial state */
+  _sce   = HIGH;
+  _reset = HIGH;
+  _sclk  = LOW;
+}
+
+/* Transmits a single byte to the LCD */
+void pcd8544::sendByte(char byte, bool command)
+{
+  int loop;
+  _dc  = !command;
+  _sce = LOW;
+  for (loop = 0; loop < 8; loop++)
+  {
+    _mosi = ((byte << loop) & 0x80); // TX starts from MSB
+    clockTick(TICK);
+  }
+  _sce = HIGH;
+}
+
+/* Writes a data byte into LCD RAM*/
+void pcd8544::writeData(char data)
+{
+  sendByte(data, false);
+}
+
+/* Sends a command to the LCD */
+void pcd8544::writeCmd(char cmd)
+{
+  sendByte(cmd, true);
+}
+
+/* Writes a ASCII character into LCD RAM */
+void pcd8544::writeChar(char character)
+{
+  char loop = 0;
+
+  if ((character >= 32) && (character <= 122))
+  {
+    character = character - 32;
+  }
+  else
+  {
+    character = 0x00;
+  }
+
+  for (loop = 0; loop < 5; loop++)
+  {
+    sendByte(ascii_table[character][loop], false);
+  }
+  sendByte(0x00, false);
+}
+
+/* Writes a string of characters into LCD RAM */
+void pcd8544::writeString(char* character)
+{
+  while (*character)
+  {
+    writeChar(char(*character));
+    character++;
+  }
+}
+
+/* Resets the LCD*/
+void pcd8544::resetLCD()
+{
+  int loop;
+  _sce   = LOW;
+  wait_us(TICK);
+  _reset = LOW;
+  for (loop = 0; loop < RESET_TICKS; loop++)
+  {
+    clockTick(TICK);
+  }
+  _reset = HIGH;
+  wait_us(TICK);
+  _sce = HIGH;
+}
+
+/* Clear the LCD RAM*/
+void pcd8544::clearLCD()
+{
+  writeCmd(0x80); // Set X ram-address to 0x00
+  writeCmd(0x40); // Set Y ram-address to 0x00
+
+  int loop = 0;
+  
+  for (loop = 0; loop < (MAX_PIX_X * CHAR_PIX_X); loop++)
+  {
+    writeData(0x00); // Write empty character
+  }
+  /* Set cursor to position 0,0 */
+  writeCmd(0x80); // Set X ram-address to 0x00
+  writeCmd(0x40); // Set Y ram-address to 0x00
+}
+
+/* Initialize the LCD with default values */
+void pcd8544::initLCD(void)
+{
+  writeCmd(0x90);  // Set Vop as in PCD8544 specs example
+  writeCmd(0x20);  // Normal instruction set. Horizontal addressing.
+  writeCmd(0x0C);  // display in normal mode
+
+  /* Set cursor to position 0,0 */
+  writeCmd(0x80); // Set X ram-address to 0x00
+  writeCmd(0x40); // Set Y ram-address to 0x00
+}
+
+
+/* Sends a clock tick to the LCD */
+inline void pcd8544::clockTick(unsigned short useg)
+{  
+    _sclk = LOW;
+    wait_us(useg);
+    _sclk = HIGH;
+    wait_us(useg);
+}
+
+/* Set the cursor position on specific character position x,y*/
+void pcd8544::setCursorXY(char x, char y)
+{
+  x = (((x % MAX_CHAR_X) * CHAR_PIX_X) | SET_ADDRES_X);
+  y = ((y % MAX_CHAR_Y)  | SET_ADDRES_Y);
+  writeCmd(x); // Set X ram-address to x
+  writeCmd(y); // Set Y ram-address to y
+}
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