/**
* Initializes the LCD in graphics mode.
* Uses a character pitch of 8 (8 bits are plotted whenever a byte is drawn)
*/
void lcd_graphics_init(void) {
unsigned char commandData;
/* Set the data direction registers apprioriately */
LCD_DATA_DDR = 0xFF;
LCD_CTRL_DDR |= (1<<LCD_CTRL_RS)|(1<<LCD_CTRL_RW)|(1<<LCD_CTRL_E);
/* Assert all control lines to low */
lcd_rw_low();
lcd_rs_low();
lcd_enable_low();
/* Send mode configuration command with
* Toggle Display On, Master, Mode Graphics bits set */
commandData = LCD_MODE_ON_OFF | LCD_MODE_MASTER_SLAVE | LCD_MODE_MODE;
lcd_write_command(LCD_CMD_MODE, commandData);
/* Send the set character pitch command with horizontal
* character pitch of 8 (so 8 pixels are painted when we draw) */
commandData = LCD_CHAR_PITCH_HP_8;
lcd_write_command(LCD_CMD_CHAR_PITCH, commandData);
/* Send the number of characters command with the total
* number of graphics bytes that can be painted horizontally
* (width/8) */
commandData = (LCD_WIDTH/8)-1;
lcd_write_command(LCD_CMD_NUM_CHARS, commandData);
/* Set the time division */
commandData = 128-1;
lcd_write_command(LCD_CMD_TIME_DIVISION, commandData);
/* Set the display low/high start address to 0x00 (left corner) */
commandData = 0x00;
lcd_write_command(LCD_CMD_DISPLAY_START_LA, commandData);
lcd_write_command(LCD_CMD_DISPLAY_START_HA, commandData);
/* Reset the cursor to home 0x00 (left corner) */
commandData = 0x00;
lcd_write_command(LCD_CMD_CURSOR_LA, commandData);
lcd_write_command(LCD_CMD_CURSOR_HA, commandData);
}
void lcd_write(uint8_t data, uint8_t rs) {
__IO uint8_t outputdata;
if(rs) { //write data
lcd_rs_high();
} else { //write instruction
lcd_rs_low();
}
lcd_rw_low(); //set to write
//set data pins to output
GPIO_InitStructure.GPIO_Pin = DATA_PORT_Pin_0 | DATA_PORT_Pin_1 |
DATA_PORT_Pin_2 | DATA_PORT_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_Init(LCD_PORT, &GPIO_InitStructure);
/**
* Preserve the RS,RW,E bits in order to write out:
* our data goe son the 4 most significant bits with
* the high nibble output first.
*/
outputdata = (uint8_t)GPIO_ReadOutputData(LCD_PORT);
outputdata &= 0x05; //we're only interested in the lower bits (RS,RW,E)
//output high nibble first
GPIO_Write(LCD_PORT, outputdata | (data & 0xF0));
//push data
lcd_e_toggle();
GPIO_Write(LCD_PORT, outputdata | ((data << 4) & 0xF0));
//push data
lcd_e_toggle();
GPIO_Write(LCD_PORT, outputdata | 0xF0); //set pins high as inactive state
}
