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lcm1602: Add support for various LCD configurations / sizes

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Signed-off-by: Sergey Kiselev <sergey.kiselev@intel.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
This commit is contained in:
Sergey Kiselev
2015-10-05 18:16:53 +00:00
committed by Mihai Tudor Panu
parent 5ff625eaf4
commit 1713d44a4b
3 changed files with 117 additions and 8 deletions
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61
src/lcd/lcm1602.cxx
View File

@ -39,10 +39,12 @@
using namespace upm;
Lcm1602::Lcm1602(int bus_in, int addr_in, bool isExpander) :
Lcm1602::Lcm1602(int bus_in, int addr_in, bool isExpander,
uint8_t numColumns, uint8_t numRows) :
m_i2c_lcd_control(new mraa::I2c(bus_in)),
m_gpioRS(0), m_gpioEnable(0), m_gpioD0(0),
m_gpioD1(0), m_gpioD2(0), m_gpioD3(0)
m_gpioD1(0), m_gpioD2(0), m_gpioD3(0),
m_numColumns(numColumns), m_numRows(numRows)
{
mraa::Result error = mraa::SUCCESS;
m_name = "Lcm1602 (I2C)";
@ -97,11 +99,13 @@ Lcm1602::Lcm1602(int bus_in, int addr_in, bool isExpander) :
}
Lcm1602::Lcm1602(uint8_t rs, uint8_t enable, uint8_t d0,
uint8_t d1, uint8_t d2, uint8_t d3) :
uint8_t d1, uint8_t d2, uint8_t d3,
uint8_t numColumns, uint8_t numRows) :
m_i2c_lcd_control(0),
m_gpioRS(new mraa::Gpio(rs)), m_gpioEnable(new mraa::Gpio(enable)),
m_gpioD0(new mraa::Gpio(d0)), m_gpioD1(new mraa::Gpio(d1)),
m_gpioD2(new mraa::Gpio(d2)), m_gpioD3(new mraa::Gpio(d3))
m_gpioD2(new mraa::Gpio(d2)), m_gpioD3(new mraa::Gpio(d3)),
m_numColumns(numColumns), m_numRows(numRows)
{
mraa::Result error = mraa::SUCCESS;
m_name = "Lcm1602 (4-bit GPIO)";
@ -196,9 +200,54 @@ mraa::Result
Lcm1602::setCursor(int row, int column)
{
mraa::Result error = mraa::SUCCESS;
column = column % m_numColumns;
uint8_t offset = column;
int row_addr[] = { 0x80, 0xc0, 0x14, 0x54 };
uint8_t offset = ((column % 16) + row_addr[row]);
switch (m_numRows)
{
case 1:
// Single row displays with more than 8 columns usually have their
// DDRAM split in two halves. The first half starts at address 00.
// The second half starts at address 40. E.g. 16x2 DDRAM mapping:
// 00 01 02 03 04 05 06 07 40 41 42 43 44 45 46 47
if (m_numColumns > 8)
{
offset = (column % (m_numColumns / 2)) +
(column / (m_numColumns / 2)) * 0x40;
}
break;
case 2:
// this should work for any display with two rows
// DDRAM mapping:
// 00 .. 27
// 40 .. 67
offset += row * 0x40;
break;
case 4:
if (m_numColumns == 16)
{
// 16x4 display
// DDRAM mapping:
// 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
// 40 41 42 43 43 45 46 47 48 49 4A 4B 4C 4D 4E 4F
// 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F
// 50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F
int row_addr[] = { 0x00, 0x40, 0x10, 0x50 };
offset += row_addr[row];
}
else
{
// 20x4 display
// DDRAM mapping:
// 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13
// 40 41 42 43 43 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53
// 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27
// 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63 64 65 66 67
int row_addr[] = { 0x00, 0x40, 0x14, 0x54 };
offset += row_addr[row];
}
break;
}
return command(LCD_CMD | offset);
}

10
src/lcd/lcm1602.h
View File

@ -72,7 +72,8 @@ class Lcm1602 : public LCD
* @param isExpander True if we are dealing with an I2C expander,
* false otherwise. Default is true.
*/
Lcm1602(int bus, int address, bool isExpander=true);
Lcm1602(int bus, int address, bool isExpander=true,
uint8_t numColumns = 16, uint8_t numRows = 4);
/**
* Lcm1602 alternate constructor, used for GPIO based hd44780
@ -87,7 +88,8 @@ class Lcm1602 : public LCD
* @param d3 Data 3 pin
*/
Lcm1602(uint8_t rs, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3);
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
uint8_t numColumns = 16, uint8_t numRows = 4);
/**
* Lcm1602 destructor
@ -225,6 +227,10 @@ class Lcm1602 : public LCD
uint8_t m_displayControl;
uint8_t m_entryDisplayMode;
// Display size
uint8_t m_numColumns;
uint8_t m_numRows;
// Add a command() and data() virtual member functions, with a
// default implementation in lcm1602. This is expected to be
// implemented by derived classes with different needs (Jhd1313m1,