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 );
}
int 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 );
return (0);
}
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;
}
void McuSystem<Speed::SPEED_16MHZ>::delayInUs(uint32_t time)
{
brief_pause(time << 2);
}
void McuSystem<Speed::SPEED_8MHZ>::delayInUs(uint32_t time)
{
//return imediately for 1/2us delay
brief_pause(time << 1);
}
