16x2 lcd interface from 8 bits to 4 bits in the hal driver

Hi everyone,

I got the solution for the above one and find the patch for the same.

--- src/altera_avalon_lcd_16207.c 2015-04-23 11:17:46.000000000 +0530

+++ src/altera_avalon_lcd_16207.c 2016-09-06 15:30:57.331296200 +0530

@@ -161,9 +161,11 @@

/* Despite what it says in the datasheet, the LCD isn't ready to accept

* a write immediately after it returns BUSY=0. Wait for 100us more.

*/

- usleep(100);

+ usleep(1000);

- IOWR_ALTERA_AVALON_LCD_16207_COMMAND(base, command);

+ IOWR_ALTERA_AVALON_LCD_16207_COMMAND(base, ( command & 0xf0 ));

+ command = command << 4;

+ IOWR_ALTERA_AVALON_LCD_16207_COMMAND(base, ( command & 0xf0 ));

}

/* --------------------------------------------------------------------- */

@@ -197,7 +199,9 @@

*/

usleep(100);

- IOWR_ALTERA_AVALON_LCD_16207_DATA(base, data);

+ IOWR_ALTERA_AVALON_LCD_16207_DATA(base, ( data & 0xf0 ));

+ data = data << 4;

+ IOWR_ALTERA_AVALON_LCD_16207_DATA(base, ( data & 0xf0 ));

sp->address++;

}

@@ -577,8 +581,11 @@

usleep(1000);

IOWR_ALTERA_AVALON_LCD_16207_COMMAND(base, LCD_CMD_FUNCTION_SET | LCD_CMD_8BIT);

- /* Setup interface parameters: 8 bit bus, 2 rows, 5x7 font */

- lcd_write_command(sp, LCD_CMD_FUNCTION_SET | LCD_CMD_8BIT | LCD_CMD_TWO_LINE);

+ /* Setup interface parameters: 4 bit bus */

+ lcd_write_command(sp, LCD_CMD_FUNCTION_SET );

+

+ /* Setup interface parameters: 4 bit bus, 2 rows, 5x7 font */

+ lcd_write_command(sp, LCD_CMD_FUNCTION_SET | LCD_CMD_TWO_LINE);

/* Turn display off */

lcd_write_command(sp, LCD_CMD_ONOFF);

Thanks