Hi,
I'm looking for a 4bit LCD "c" code to drive a hd47780 LCD with Launchpad.
Is there any "C" library available? I check the files section but only found
assembly code.
Any pointers would be appreciated.
Thanks.
Chetan
4bit LCD C code
Started by ●March 5, 2011
Reply by ●March 5, 20112011-03-05
You can find this ! follow this
download FreeRTOS 6.1.1. (free)
in the directory example there is a lot of C code for many board
The MBC 2300 board ( keil ) have a build in LCD 16 chars X 2 lines and you can
see a driver in C code for init, clear and write on this kind of display
With msp430, the code will be very similar, just change the IO port and timing
Bye
download FreeRTOS 6.1.1. (free)
in the directory example there is a lot of C code for many board
The MBC 2300 board ( keil ) have a build in LCD 16 chars X 2 lines and you can
see a driver in C code for init, clear and write on this kind of display
With msp430, the code will be very similar, just change the IO port and timing
Bye
Reply by ●March 6, 20112011-03-06
Hi,
I can't find the example directory in the source tree.
Did I download the correct file?
Thanks.
Chetan
\FreeRTOSV6.1.1.zip\FreeRTOSV6.1.1\Source\
include\
portable\
croutine.c
list.c
queue.c
readme.txt
tasks.c
\FreeRTOSV6.1.1\Source\portable\GCC\MSP430F449\
port.c
portmacro.h
\FreeRTOSV6.1.1\Source\include\
croutine.h
FreeRTOS.h
list.h
mpu_wrappers.h
portable.h
projdefs.h
queue.h
semphr.h
StackMacros.h
task.h
\FreeRTOSV6.1.1\Demo\msp430_GCC\
ParTest\
serial\
FreeRTOSConfig.h
gdb.ini
main.c
makefile
--- In m..., Ren wrote:
>
> You can find this ! follow this
>
> download FreeRTOS 6.1.1. (free)
> in the directory example there is a lot of C code for many board
> The MBC 2300 board ( keil ) have a build in LCD 16 chars X 2 lines and you can
> see a driver in C code for init, clear and write on this kind of display
>
> With msp430, the code will be very similar, just change the IO port and timing
> Bye
>
I can't find the example directory in the source tree.
Did I download the correct file?
Thanks.
Chetan
\FreeRTOSV6.1.1.zip\FreeRTOSV6.1.1\Source\
include\
portable\
croutine.c
list.c
queue.c
readme.txt
tasks.c
\FreeRTOSV6.1.1\Source\portable\GCC\MSP430F449\
port.c
portmacro.h
\FreeRTOSV6.1.1\Source\include\
croutine.h
FreeRTOS.h
list.h
mpu_wrappers.h
portable.h
projdefs.h
queue.h
semphr.h
StackMacros.h
task.h
\FreeRTOSV6.1.1\Demo\msp430_GCC\
ParTest\
serial\
FreeRTOSConfig.h
gdb.ini
main.c
makefile
--- In m..., Ren wrote:
>
> You can find this ! follow this
>
> download FreeRTOS 6.1.1. (free)
> in the directory example there is a lot of C code for many board
> The MBC 2300 board ( keil ) have a build in LCD 16 chars X 2 lines and you can
> see a driver in C code for init, clear and write on this kind of display
>
> With msp430, the code will be very similar, just change the IO port and timing
> Bye
>
Reply by ●March 6, 20112011-03-06
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Reply by ●March 6, 20112011-03-06
cbhargava wrote:
> Hi,
>
> I can't find the example directory in the source tree.
> Did I download the correct file?
>
>
Ok, Best, Dan.
(With a pcf8574 it just takes two pins, and those pins can do a whole
lot more too. This was from an old 149 project, I wasn't worried about
eating pins or CPU time.)
Tested, works fine, you should be able to work out extra commands from
the data sheet:
~~~
#define LCD_MODE_BIT 0x02
#define LCD_R_W_BIT 0x04
#define LCD_ENABLE_BIT 0x08
#define LCD_BF_FLAG 0x10
#define LCD_CMD_MASK 0x0e
#define LCD_DATA_MASK 0xf0
#define LCD_PORT_OUT P4OUT
#define LCD_PORT_DIR P4DIR
void putchar( uint16_t in )
{
LCD_PORT_OUT= ( in & 0xf0 ) | LCD_MODE_BIT;
LCD_PORT_OUT|= LCD_ENABLE_BIT;
nop( );
LCD_PORT_OUT&= ~LCD_ENABLE_BIT;
//
LCD_PORT_OUT= ( ( in << 4 ) & 0xf0 ) | LCD_MODE_BIT;
LCD_PORT_OUT|= LCD_ENABLE_BIT;
nop( );
LCD_PORT_OUT&= ~LCD_ENABLE_BIT;
nop( );
LCD_PORT_OUT= 0;
brief_pause( 200 );
}
void lcd_command( uint16_t cmd )
{
LCD_PORT_OUT= ( cmd & 0xf0 );
LCD_PORT_OUT|= LCD_ENABLE_BIT;
nop( );
LCD_PORT_OUT&= ~LCD_ENABLE_BIT;
//
LCD_PORT_OUT= ( ( cmd << 4 ) & 0xf0 );
LCD_PORT_OUT|= LCD_ENABLE_BIT;
nop( );
LCD_PORT_OUT&= ~LCD_ENABLE_BIT;
nop( );
LCD_PORT_OUT= 0;
brief_pause( 3000 );
}
void lcd_init( )
{
//lcd
LCD_PORT_OUT= 0;
LCD_PORT_DIR|= LCD_DATA_MASK | LCD_CMD_MASK;
//assume VCC+ > 20ms away
//first init
LCD_PORT_OUT= 0x30;
LCD_PORT_OUT|= LCD_ENABLE_BIT;
nop( );
LCD_PORT_OUT&= ~LCD_ENABLE_BIT;
//pause should be set by mclk div, > 4.1ms
brief_pause( 15000 );
//second init
LCD_PORT_OUT|= LCD_ENABLE_BIT;
nop( );
LCD_PORT_OUT&= ~LCD_ENABLE_BIT;
//pause should be set by mclk div, > 100us
brief_pause( 500 );
//four bit mode
LCD_PORT_OUT= 0x20;
LCD_PORT_OUT|= LCD_ENABLE_BIT;
nop( );
LCD_PORT_OUT&= ~LCD_ENABLE_BIT;
brief_pause( 1000 );
//from here 'lcd_command can be used
//operational mode 5x8 1/16 duty( two lines )
lcd_command( 0x28 );
brief_pause( 1000 );
//display off
lcd_command( 0x08 );
brief_pause( 1000 );
//display on, no cursor, no blink...
lcd_command( 0x0c );
brief_pause( 1000 );
LCD_PORT_OUT= 0;
}
> Hi,
>
> I can't find the example directory in the source tree.
> Did I download the correct file?
>
>
Ok, Best, Dan.
(With a pcf8574 it just takes two pins, and those pins can do a whole
lot more too. This was from an old 149 project, I wasn't worried about
eating pins or CPU time.)
Tested, works fine, you should be able to work out extra commands from
the data sheet:
~~~
#define LCD_MODE_BIT 0x02
#define LCD_R_W_BIT 0x04
#define LCD_ENABLE_BIT 0x08
#define LCD_BF_FLAG 0x10
#define LCD_CMD_MASK 0x0e
#define LCD_DATA_MASK 0xf0
#define LCD_PORT_OUT P4OUT
#define LCD_PORT_DIR P4DIR
void putchar( uint16_t in )
{
LCD_PORT_OUT= ( in & 0xf0 ) | LCD_MODE_BIT;
LCD_PORT_OUT|= LCD_ENABLE_BIT;
nop( );
LCD_PORT_OUT&= ~LCD_ENABLE_BIT;
//
LCD_PORT_OUT= ( ( in << 4 ) & 0xf0 ) | LCD_MODE_BIT;
LCD_PORT_OUT|= LCD_ENABLE_BIT;
nop( );
LCD_PORT_OUT&= ~LCD_ENABLE_BIT;
nop( );
LCD_PORT_OUT= 0;
brief_pause( 200 );
}
void lcd_command( uint16_t cmd )
{
LCD_PORT_OUT= ( cmd & 0xf0 );
LCD_PORT_OUT|= LCD_ENABLE_BIT;
nop( );
LCD_PORT_OUT&= ~LCD_ENABLE_BIT;
//
LCD_PORT_OUT= ( ( cmd << 4 ) & 0xf0 );
LCD_PORT_OUT|= LCD_ENABLE_BIT;
nop( );
LCD_PORT_OUT&= ~LCD_ENABLE_BIT;
nop( );
LCD_PORT_OUT= 0;
brief_pause( 3000 );
}
void lcd_init( )
{
//lcd
LCD_PORT_OUT= 0;
LCD_PORT_DIR|= LCD_DATA_MASK | LCD_CMD_MASK;
//assume VCC+ > 20ms away
//first init
LCD_PORT_OUT= 0x30;
LCD_PORT_OUT|= LCD_ENABLE_BIT;
nop( );
LCD_PORT_OUT&= ~LCD_ENABLE_BIT;
//pause should be set by mclk div, > 4.1ms
brief_pause( 15000 );
//second init
LCD_PORT_OUT|= LCD_ENABLE_BIT;
nop( );
LCD_PORT_OUT&= ~LCD_ENABLE_BIT;
//pause should be set by mclk div, > 100us
brief_pause( 500 );
//four bit mode
LCD_PORT_OUT= 0x20;
LCD_PORT_OUT|= LCD_ENABLE_BIT;
nop( );
LCD_PORT_OUT&= ~LCD_ENABLE_BIT;
brief_pause( 1000 );
//from here 'lcd_command can be used
//operational mode 5x8 1/16 duty( two lines )
lcd_command( 0x28 );
brief_pause( 1000 );
//display off
lcd_command( 0x08 );
brief_pause( 1000 );
//display on, no cursor, no blink...
lcd_command( 0x0c );
brief_pause( 1000 );
LCD_PORT_OUT= 0;
}
Reply by ●March 6, 20112011-03-06
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Reply by ●March 6, 20112011-03-06
Thanks Dan,
That was helpful. I will try to enhance it. I already compiled your code with mspgcc4 after a few modifications.
Thanks.
Chetan Bhargava
--- In m..., Dan Bloomquist wrote:
>
> Ok, Best, Dan.
>
> (With a pcf8574 it just takes two pins, and those pins can do a whole
> lot more too. This was from an old 149 project, I wasn't worried about
> eating pins or CPU time.)
>
> Tested, works fine, you should be able to work out extra commands from
> the data sheet:
That was helpful. I will try to enhance it. I already compiled your code with mspgcc4 after a few modifications.
Thanks.
Chetan Bhargava
--- In m..., Dan Bloomquist wrote:
>
> Ok, Best, Dan.
>
> (With a pcf8574 it just takes two pins, and those pins can do a whole
> lot more too. This was from an old 149 project, I wasn't worried about
> eating pins or CPU time.)
>
> Tested, works fine, you should be able to work out extra commands from
> the data sheet:
Reply by ●March 6, 20112011-03-06
Sorry, I forgot tell you this:
the LCD code is in the IAR( or keil) LPC23XX ( ARM7)
you must download freeRTOS for this processeur
Bye
the LCD code is in the IAR( or keil) LPC23XX ( ARM7)
you must download freeRTOS for this processeur
Bye
Reply by ●March 6, 20112011-03-06
Thanks,
I'll take a look.
--- In m..., Ren wrote:
>
> Sorry, I forgot tell you this:
> the LCD code is in the IAR( or keil) LPC23XX ( ARM7)
>
> you must download freeRTOS for this processeur
>
> Bye
>
I'll take a look.
--- In m..., Ren wrote:
>
> Sorry, I forgot tell you this:
> the LCD code is in the IAR( or keil) LPC23XX ( ARM7)
>
> you must download freeRTOS for this processeur
>
> Bye
>
Reply by ●March 7, 20112011-03-07
Some time ago I wrote a library for 8051. I might as well port it.
Thanks.
--- In m..., "cbhargava" wrote:
>
> Thanks,
>
> I'll take a look.
>
>
>
> --- In m..., Ren wrote:
> >
> > Sorry, I forgot tell you this:
> > the LCD code is in the IAR( or keil) LPC23XX ( ARM7)
> >
> > you must download freeRTOS for this processeur
> >
> > Bye
>
Thanks.
--- In m..., "cbhargava" wrote:
>
> Thanks,
>
> I'll take a look.
>
>
>
> --- In m..., Ren wrote:
> >
> > Sorry, I forgot tell you this:
> > the LCD code is in the IAR( or keil) LPC23XX ( ARM7)
> >
> > you must download freeRTOS for this processeur
> >
> > Bye
>
