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lcm1602: added backlight control and default bus/address for I2C variants

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Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
This commit is contained in:
Mihai Tudor Panu 2016-05-12 13:48:06 -07:00
parent 3eda1bce16
commit de986764d4
2 changed files with 42 additions and 7 deletions
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18
src/lcd/lcm1602.cxx
View File

@ -50,6 +50,7 @@ Lcm1602::Lcm1602(int bus_in, int addr_in, bool isExpander,
mraa::Result error = mraa::SUCCESS;
m_name = "Lcm1602 (I2C)";
m_isI2C = true;
m_backlight = LCD_BACKLIGHT;
m_lcd_control_address = addr_in;
@ -73,7 +74,7 @@ Lcm1602::Lcm1602(int bus_in, int addr_in, bool isExpander,
return;
usleep(50000);
expandWrite(LCD_BACKLIGHT);
backlightOn();
usleep(100000);
write4bits(0x03 << 4);
@ -111,6 +112,7 @@ Lcm1602::Lcm1602(uint8_t rs, uint8_t enable, uint8_t d0,
mraa::Result error = mraa::SUCCESS;
m_name = "Lcm1602 (4-bit GPIO)";
m_isI2C = false;
m_backlight = LCD_BACKLIGHT;
// setup our gpios
@ -322,6 +324,18 @@ mraa::Result Lcm1602::cursorBlinkOff()
return command(LCD_DISPLAYCONTROL | m_displayControl);
}
mraa::Result Lcm1602::backlightOn()
{
m_backlight = LCD_BACKLIGHT;
return expandWrite(m_backlight);
}
mraa::Result Lcm1602::backlightOff()
{
m_backlight = LCD_NOBACKLIGHT;
return expandWrite(m_backlight);
}
mraa::Result Lcm1602::scrollDisplayLeft()
{
return command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT);
@ -431,7 +445,7 @@ Lcm1602::expandWrite(uint8_t value)
if (!m_isI2C)
return mraa::ERROR_INVALID_RESOURCE;
uint8_t buffer = value | LCD_BACKLIGHT;
uint8_t buffer = value | m_backlight;
return m_i2c_lcd_control->writeByte(buffer);
}

31
src/lcd/lcm1602.hpp
View File

@ -73,13 +73,15 @@ class Lcm1602 : public LCD
/**
* Lcm1602 constructor; calls libmraa initialisation functions
*
* @param bus I2C bus to use
* @param address Slave address the LCD is registered on
* @param bus I2C bus to use. Default 0 (autodetect).
* @param address Slave address the LCD is registered on. Default 0x27
* @param isExpander True if we are dealing with an I2C expander,
* false otherwise. Default is true.
* @param numColumns Number of columns the display has. Default 16.
* @param numRows Number of rows the display has. Default 2.
*/
Lcm1602(int bus, int address, bool isExpander=true,
uint8_t numColumns = 16, uint8_t numRows = 4);
Lcm1602(int bus = 0, int address = 0x27, bool isExpander=true,
uint8_t numColumns = 16, uint8_t numRows = 2);
/**
* Lcm1602 alternate constructor, used for GPIO based HD44780
@ -92,10 +94,12 @@ class Lcm1602 : public LCD
* @param d1 Data 1 pin
* @param d2 Data 2 pin
* @param d3 Data 3 pin
* @param numColumns Number of columns the display has. Default 16.
* @param numRows Number of rows the display has. Default 2.
*/
Lcm1602(uint8_t rs, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
uint8_t numColumns = 16, uint8_t numRows = 4);
uint8_t numColumns = 16, uint8_t numRows = 2);
/**
* Lcm1602 destructor
@ -181,6 +185,20 @@ class Lcm1602 : public LCD
*/
mraa::Result cursorBlinkOff();
/**
* Turn backlight on
*
* @return Result of operation
*/
mraa::Result backlightOn();
/**
* Turn backlight off
*
* @return Result of operation
*/
mraa::Result backlightOff();
/**
* Scroll the display left, without changing the character RAM
*
@ -236,6 +254,9 @@ class Lcm1602 : public LCD
// Display size
uint8_t m_numColumns;
uint8_t m_numRows;
// Backlight
uint8_t m_backlight;
// Add a command() and data() virtual member functions, with a
// default implementation in lcm1602. This is expected to be