/** Main program entry point. This routine contains the overall program flow, including initial
* setup of all components and the main program loop.
*/
int main(void)
{
SetupHardware();
RingBuffer_InitBuffer(&FromHost_Buffer, FromHost_Buffer_Data, sizeof(FromHost_Buffer_Data));
GlobalInterruptEnable();
for (;;)
{
/* Only try to read in bytes from the CDC interface if the transmit buffer is not full */
if (!(RingBuffer_IsFull(&FromHost_Buffer)))
{
int16_t ReceivedByte = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
/* Read bytes from the USB OUT endpoint into the USART transmit buffer */
if (!(ReceivedByte < 0))
RingBuffer_Insert(&FromHost_Buffer, ReceivedByte);
}
while (RingBuffer_GetCount(&FromHost_Buffer) > 0)
{
static uint8_t EscapePending = 0;
int16_t HD44780Byte = RingBuffer_Remove(&FromHost_Buffer);
if (HD44780Byte == COMMAND_ESCAPE)
{
if (EscapePending)
{
HD44780_WriteData(HD44780Byte);
EscapePending = 0;
}
else
{
/* Next received character is the command byte */
EscapePending = 1;
}
}
else
{
if (EscapePending)
{
HD44780_WriteCommand(HD44780Byte);
EscapePending = 0;
}
else
{
HD44780_WriteData(HD44780Byte);
}
}
}
CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
USB_USBTask();
}
}
void HD44780_GoToPoint(char row, char col)
{
char DDRAM_address;
if(row<1) row=1; // first position user-defined as (1,1)
if(col<=1)col=0; // but HD44780 defines as (0,0)
else col=col-1;
if(row==1) DDRAM_address = 0x80+col; // 0x80 for set DDRAM address command
if(row==2) DDRAM_address = 0x80+0x40+col; // 0x40 for second line DDRAM address
HD44780_WriteCommand(DDRAM_address);
}
void HD44780_Init(void)
{
//Using initialize by instruction
//After power on Wait for LCD to Initialize
delay100MiliSecond();
HD44780_initPinIO();
HD44780_EN_PIN = 0;
HD44780_RS_PIN = 0;
HD44780_DATA_PORT = 0x30;
HD44780_Clock();
delay5MiliSecond();
HD44780_DATA_PORT = 0x30;
HD44780_Clock();
delay200MicroSecond();
HD44780_DATA_PORT = 0x30;
HD44780_Clock();
delay200MicroSecond();
// FUNCTION SET | 0 0 1 1 N F * * |
// BIN_OR_BIT_MASK: { 0 0 1 1 1 0 0 0 }
HD44780_WriteCommand(0x38); // N = 1; 2 lines, F = 0; 5x8 dots
delay5MiliSecond();
// DISPLAY OFF
HD44780_WriteCommand(0x0C);
delay5MiliSecond();
// DISPLAY CLEAR
HD44780_WriteCommand(0x01);
delay5MiliSecond();
// ENTRY MODE SET | 0 0 0 0 0 1 I/D S |
// BIN_OR_BIT_MASK: { 0 0 0 0 0 1 1 0 }
HD44780_WriteCommand(0x06); // I/D = 1; Increment by 1, S = 0; No shift
delay5MiliSecond();
// HOME POSITION
HD44780_WriteCommand(0x80);
}
/** Configures the board hardware and chip peripherals for the application's functionality. */
void SetupHardware(void)
{
/* Disable watchdog if enabled by bootloader/fuses */
MCUSR &= ~(1 << WDRF);
wdt_disable();
/* Disable clock division */
clock_prescale_set(clock_div_1);
/* Hardware Initialization */
USB_Init();
/* Power up the HD44780 Interface */
HD44780_Initialize();
HD44780_WriteCommand(CMD_DISPLAY_ON);
/* Start the flush timer so that overflows occur rapidly to push received bytes to the USB interface */
TCCR0B = (1 << CS02);
}
