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i2clcd: Add createChar method

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LCDs based on the HD44780 allow for setting 8 custom characters.
This patch adds a method that exposes this capability.

Signed-off-by: Clark Scheff <clark@scheffsblend.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
This commit is contained in:
Clark Scheff 2015-02-25 05:17:59 +00:00 committed by Mihai Tudor Panu
parent 27a3a90d1f
commit 7bd7e80b2e
2 changed files with 18 additions and 0 deletions
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14
src/lcd/i2clcd.cxx
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@ -47,6 +47,20 @@ I2CLcd::write (int row, int column, std::string msg) {
write (msg); write (msg);
} }
mraa_result_t
I2CLcd::createChar(uint8_t charSlot, uint8_t charData[]) {
mraa_result_t error = MRAA_SUCCESS;
charSlot &= 0x07; // only have 8 positions we can set
error = i2Cmd(m_i2c_lcd_control, LCD_SETCGRAMADDR | (charSlot << 3));
if (error == MRAA_SUCCESS) {
for (int i = 0; i < 8; i++) {
error = i2cData(m_i2c_lcd_control, charData[i]);
}
}
return error;
}
mraa_result_t mraa_result_t
I2CLcd::close() { I2CLcd::close() {
return mraa_i2c_stop(m_i2c_lcd_control); return mraa_i2c_stop(m_i2c_lcd_control);

4
src/lcd/i2clcd.h
View File

@ -68,6 +68,9 @@ namespace upm {
#define LCD_5x10DOTS 0x04 #define LCD_5x10DOTS 0x04
#define LCD_5x8DOTS 0x00 #define LCD_5x8DOTS 0x00
// flags for CGRAM
#define LCD_SETCGRAMADDR 0x40
#define LCD_EN 0x04 // Enable bit #define LCD_EN 0x04 // Enable bit
#define LCD_RW 0x02 // Read/Write bit #define LCD_RW 0x02 // Read/Write bit
#define LCD_RS 0x01 // Register select bit #define LCD_RS 0x01 // Register select bit
@ -85,6 +88,7 @@ class I2CLcd {
virtual mraa_result_t setCursor (int row, int column) = 0; virtual mraa_result_t setCursor (int row, int column) = 0;
virtual mraa_result_t clear () = 0; virtual mraa_result_t clear () = 0;
virtual mraa_result_t home () = 0; virtual mraa_result_t home () = 0;
virtual mraa_result_t createChar(uint8_t charSlot, uint8_t charData[]);
virtual mraa_result_t i2Cmd (mraa_i2c_context ctx, uint8_t value); virtual mraa_result_t i2Cmd (mraa_i2c_context ctx, uint8_t value);
virtual mraa_result_t i2cReg (mraa_i2c_context ctx, int deviceAdress, int addr, uint8_t data); virtual mraa_result_t i2cReg (mraa_i2c_context ctx, int deviceAdress, int addr, uint8_t data);
virtual mraa_result_t i2cData (mraa_i2c_context ctx, uint8_t value); virtual mraa_result_t i2cData (mraa_i2c_context ctx, uint8_t value);