IPN ESIME ZACATENCO
TextLCD con soporte para el Módulo Arduino I2C basado en el PCF8574AT y para el SPI utilizando el SN74595
Dependents: FRDM-KL46Z_Deshidratador FRDM-KL46Z_LCD_Test FRDM-KL46Z_LCD_Test FRDM-KL46Z_Pasos ... more
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TextLCD
by 
Wim Huiskamp
Diff: TextLCD.cpp
- Revision:
- 26:bd897a001012
- Parent:
- 25:6162b31128c9
- Child:
- 27:22d5086f6ba6
--- a/TextLCD.cpp Sat May 10 21:34:51 2014 +0000
+++ b/TextLCD.cpp Fri May 30 15:05:13 2014 +0000
@@ -9,6 +9,7 @@
* 2013, v07: WH, Added support for backlight and include portdefinitions for LCD2004 Module from DFROBOT
* 2014, v08: WH, Refactored in Base and Derived Classes to deal with mbed lib change regarding 'NC' defined pins
* 2014, v09: WH/EO, Added Class for Native SPI controllers such as ST7032
+ * 2014, v10: WH, Added Class for Native I2C controllers such as ST7032i, Added support for MCP23008 I2C portexpander, Added support for Adafruit module
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
@@ -78,9 +79,9 @@
*/
void TextLCD_Base::_initCtrl() {
- this->_setRS(false); // command mode
+ this->_setRS(false); // command mode
- wait_ms(20); // Wait 20ms to ensure powered up
+ wait_ms(20); // Wait 20ms to ensure powered up
// send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
for (int i=0; i<3; i++) {
@@ -111,16 +112,34 @@
wait_ms(50);
break;
- case ST7032:
+ case ST7032_3V3:
+ // ST7032 controller: Initialise Voltage booster for VLCD. VDD=3V3
+
_writeByte( 0x1c ); //Internal OSC frequency adjustment 183HZ, bias will be 1/4
wait_us(30);
- _writeByte( 0x73 ); //Contrast control low byte
+ _writeByte( 0x73 ); //Contrast control low byte
wait_us(30);
- _writeByte( 0x57 ); //booster circuit is turn on. /ICON display off. /Contrast control high byte
+ _writeByte( 0x57 ); //booster circuit is turned on. /ICON display off. /Contrast control high byte
wait_us(30);
_writeByte( 0x6c ); //Follower control
wait_us(50);
- _writeByte( 0x0c ); //DISPLAY ON
+ _writeByte( 0x0c ); //DISPLAY ON, not needed
+ wait_us(30);
+ break;
+
+//Check and fix booster disable
+ case ST7032_5V:
+ // ST7032 controller: Disable Voltage booster for VLCD. VDD=5V
+
+ _writeByte( 0x1c ); //Internal OSC frequency adjustment 183HZ, bias will be 1/4
+ wait_us(30);
+ _writeByte( 0x73 ); //Contrast control low byte
+ wait_us(30);
+ _writeByte( 0x57 ); //booster circuit is turned on. /ICON display off. /Contrast control high byte
+ wait_us(30);
+ _writeByte( 0x6c ); //Follower control
+ wait_us(50);
+ _writeByte( 0x0c ); //DISPLAY ON --> remove, done later?
wait_us(30);
break;
@@ -858,10 +877,10 @@
//--------- Start TextLCD_I2C -----------
-/** Create a TextLCD interface using an I2C PC8574 or PCF8574A portexpander
+/** Create a TextLCD interface using an I2C PC8574 (or PCF8574A) or MCP23008 portexpander
*
* @param i2c I2C Bus
- * @param deviceAddress I2C slave address (PCF8574 or PCF8574A, default = 0x40)
+ * @param deviceAddress I2C slave address (PCF8574, PCF8574A or MCP23008, default = 0x40)
* @param type Sets the panel size/addressing mode (default = LCD16x2)
* @param ctrl LCD controller (default = HD44780)
*/
@@ -871,11 +890,35 @@
_slaveAddress = deviceAddress & 0xFE;
+
+#if (MCP23008==1)
+ // MCP23008 portexpander Init
+ _write_register(IODIR, 0x00); // All outputs
+ _write_register(IPOL, 0x00); // No reverse polarity
+ _write_register(GPINTEN, 0x00); // No interrupt
+ _write_register(DEFVAL, 0x00); // Default value to compare against for interrupts
+ _write_register(INTCON, 0x00); // No interrupt on changes
+ _write_register(IOCON, 0x00); // Interrupt polarity
+ _write_register(GPPU, 0x00); // No Pullup
+ _write_register(INTF, 0x00); //
+ _write_register(INTCAP, 0x00); //
+ _write_register(GPIO, 0x00); // Output/Input pins
+ _write_register(OLAT, 0x00); // Output Latch
+
// Init the portexpander bus
_lcd_bus = D_LCD_BUS_DEF;
// write the new data to the portexpander
+ _write_register(GPIO, _lcd_bus);
+#else
+ // PCF8574 of PCF8574A portexpander
+
+ // Init the portexpander bus
+ _lcd_bus = D_LCD_BUS_DEF;
+
+ // write the new data to the portexpander
_i2c->write(_slaveAddress, &_lcd_bus, 1);
+#endif
_init();
@@ -886,34 +929,59 @@
void TextLCD_I2C::_setEnable(bool value) {
if(_ctrl_idx==_LCDCtrl_0) {
- if (value)
+ if (value) {
_lcd_bus |= D_LCD_E; // Set E bit
- else
+ }
+ else {
_lcd_bus &= ~D_LCD_E; // Reset E bit
+ }
}
else {
- if (value)
+ if (value) {
_lcd_bus |= D_LCD_E2; // Set E2 bit
- else
+ }
+ else {
_lcd_bus &= ~D_LCD_E2; // Reset E2bit
- }
+ }
+ }
+
+
+#if (MCP23008==1)
+ // MCP23008 portexpander
+
+ // write the new data to the portexpander
+ _write_register(GPIO, _lcd_bus);
+#else
+ // PCF8574 of PCF8574A portexpander
// write the new data to the I2C portexpander
_i2c->write(_slaveAddress, &_lcd_bus, 1);
-
+#endif
}
// Set RS pin
// Used for mbed pins, I2C bus expander or SPI shiftregister
void TextLCD_I2C::_setRS(bool value) {
- if (value)
+ if (value) {
_lcd_bus |= D_LCD_RS; // Set RS bit
- else
+ }
+ else {
_lcd_bus &= ~D_LCD_RS; // Reset RS bit
+ }
+
+
+#if (MCP23008==1)
+ // MCP23008 portexpander
+
+ // write the new data to the portexpander
+ _write_register(GPIO, _lcd_bus);
+#else
+ // PCF8574 of PCF8574A portexpander
// write the new data to the I2C portexpander
_i2c->write(_slaveAddress, &_lcd_bus, 1);
+#endif
}
@@ -921,13 +989,24 @@
// Used for mbed pins, I2C bus expander or SPI shiftregister
void TextLCD_I2C::_setBL(bool value) {
- if (value)
+ if (value) {
_lcd_bus |= D_LCD_BL; // Set BL bit
- else
+ }
+ else {
_lcd_bus &= ~D_LCD_BL; // Reset BL bit
+ }
+
+#if (MCP23008==1)
+ // MCP23008 portexpander
+
+ // write the new data to the portexpander
+ _write_register(GPIO, _lcd_bus);
+#else
+ // PCF8574 of PCF8574A portexpander
// write the new data to the I2C portexpander
_i2c->write(_slaveAddress, &_lcd_bus, 1);
+#endif
}
@@ -941,31 +1020,56 @@
// Set bit by bit to support any mapping of expander portpins to LCD pins
data = value & 0x0F;
- if (data & 0x01)
+ if (data & 0x01){
_lcd_bus |= D_LCD_D4; // Set Databit
- else
- _lcd_bus &= ~D_LCD_D4; // Reset Databit
+ }
+ else {
+ _lcd_bus &= ~D_LCD_D4; // Reset Databit
+ }
- if (data & 0x02)
+ if (data & 0x02){
_lcd_bus |= D_LCD_D5; // Set Databit
- else
- _lcd_bus &= ~D_LCD_D5; // Reset Databit
+ }
+ else {
+ _lcd_bus &= ~D_LCD_D5; // Reset Databit
+ }
- if (data & 0x04)
+ if (data & 0x04) {
_lcd_bus |= D_LCD_D6; // Set Databit
- else
- _lcd_bus &= ~D_LCD_D6; // Reset Databit
+ }
+ else {
+ _lcd_bus &= ~D_LCD_D6; // Reset Databit
+ }
- if (data & 0x08)
+ if (data & 0x08) {
_lcd_bus |= D_LCD_D7; // Set Databit
- else
- _lcd_bus &= ~D_LCD_D7; // Reset Databit
+ }
+ else {
+ _lcd_bus &= ~D_LCD_D7; // Reset Databit
+ }
+#if (MCP23008==1)
+ // MCP23008 portexpander
+
+ // write the new data to the portexpander
+ _write_register(GPIO, _lcd_bus);
+#else
+ // PCF8574 of PCF8574A portexpander
+
// write the new data to the I2C portexpander
- _i2c->write(_slaveAddress, &_lcd_bus, 1);
+ _i2c->write(_slaveAddress, &_lcd_bus, 1);
+#endif
}
+// Write data to MCP23008 I2C portexpander
+void TextLCD_I2C::_write_register (int reg, int value) {
+ char data[] = {reg, value};
+
+ _i2c->write(_slaveAddress, data, 2);
+
+}
+
//---------- End TextLCD_I2C ------------
@@ -1008,16 +1112,20 @@
void TextLCD_SPI::_setEnable(bool value) {
if(_ctrl_idx==_LCDCtrl_0) {
- if (value)
+ if (value) {
_lcd_bus |= D_LCD_E; // Set E bit
- else
+ }
+ else {
_lcd_bus &= ~D_LCD_E; // Reset E bit
+ }
}
else {
- if (value)
+ if (value) {
_lcd_bus |= D_LCD_E2; // Set E2 bit
- else
+ }
+ else {
_lcd_bus &= ~D_LCD_E2; // Reset E2 bit
+ }
}
// write the new data to the SPI portexpander
@@ -1073,25 +1181,33 @@
// Set bit by bit to support any mapping of expander portpins to LCD pins
data = value & 0x0F;
- if (data & 0x01)
+ if (data & 0x01) {
_lcd_bus |= D_LCD_D4; // Set Databit
- else
+ }
+ else {
_lcd_bus &= ~D_LCD_D4; // Reset Databit
-
- if (data & 0x02)
+ }
+
+ if (data & 0x02) {
_lcd_bus |= D_LCD_D5; // Set Databit
- else
+ }
+ else {
_lcd_bus &= ~D_LCD_D5; // Reset Databit
-
- if (data & 0x04)
+ }
+
+ if (data & 0x04) {
_lcd_bus |= D_LCD_D6; // Set Databit
- else
+ }
+ else {
_lcd_bus &= ~D_LCD_D6; // Reset Databit
-
- if (data & 0x08)
+ }
+
+ if (data & 0x08) {
_lcd_bus |= D_LCD_D7; // Set Databit
- else
- _lcd_bus &= ~D_LCD_D7; // Reset Databit
+ }
+ else {
+ _lcd_bus &= ~D_LCD_D7; // Reset Databit
+ }
// write the new data to the SPI portexpander
_setCS(false);
@@ -1125,7 +1241,7 @@
* @param rs Instruction/data control line
* @param type Sets the panel size/addressing mode (default = LCD16x2)
* @param bl Backlight control line (optional, default = NC)
- * @param ctrl LCD controller (default = ST7032)
+ * @param ctrl LCD controller (default = ST7032_3V3)
*/
TextLCD_SPI_N::TextLCD_SPI_N(SPI *spi, PinName cs, PinName rs, LCDType type, PinName bl, LCDCtrl ctrl) :
TextLCD_Base(type, ctrl),
@@ -1169,8 +1285,9 @@
// Set BL pin
void TextLCD_SPI_N::_setBL(bool value) {
- if (_bl)
+ if (_bl) {
_bl->write(value);
+ }
}
// Write a byte using SPI