// Write cycle time requires at least a minimum of 66 ns for a write-strobe.
void LCD_strobeWriteLine(){
LCD_negateWr(); // Make sure it is negated.
LCD_assertWr(); // Assert it.
// LCD_delay10Nanoseconds(4); // Wait for 40 ns.
LCD_negateWr(); // negate it.
// LCD_delay10Nanoseconds(4); // Wait for 40 ns.
}
// Initialization common to both shield & breakout configs
void Adafruit_TFTLCD::init(void) {
//
//#ifdef USE_ADAFRUIT_SHIELD_PINOUT
// CS_IDLE; // Set all control bits to idle state
// WR_IDLE;
// RD_IDLE;
// CD_DATA;
// digitalWrite(5, HIGH); // Reset line
// pinMode(A3, OUTPUT); // Enable outputs
// pinMode(A2, OUTPUT);
// pinMode(A1, OUTPUT);
// pinMode(A0, OUTPUT);
// pinMode( 5, OUTPUT);
//#endif
//
// setWriteDir(); // Set up LCD data port(s) for WRITE operations
LCD_negateWr();
LCD_negateRd();
LCD_setDataMode();
LCD_setWriteDataDirection();
rotation = 0;
cursor_y = cursor_x = 0;
textsize = 1;
textcolor = 0xFFFF;
_width = TFTWIDTH;
_height = TFTHEIGHT;
}
// Reset pin is not connected so only the software writes occur. BLH
void Adafruit_TFTLCD::reset(void) {
// CS_IDLE;
//// CD_DATA;
// WR_IDLE;
// RD_IDLE;
LCD_setDataMode();
LCD_negateWr();
LCD_negateRd();
//
//#ifdef USE_ADAFRUIT_SHIELD_PINOUT
// digitalWrite(5, LOW);
// delay(2);
// digitalWrite(5, HIGH);
//#else
// if(_reset) {
// digitalWrite(_reset, LOW);
// delay(2);
// digitalWrite(_reset, HIGH);
// }
//#endif
//
// // Data transfer sync
// CS_ACTIVE;
// CD_COMMAND;
LCD_setCommandMode();
LCD_write8(0x00);
for(uint8_t i=0; i<3; i++)
//WR_STROBE; // Three extra 0x00s
LCD_strobeWriteLine();
// CS_IDLE;
}
// This init intializes all of the hardware that talks to the LCD panel.
void LCD_init() {
// printf("LCD_init called.\n\r");
if (initFlag) // Check to see if init has already been called.
return; // Already initialized, just return.
int status; // First call, continue...
status = XGpio_Initialize(&gpioTftControl, LCD_CONTROL_DEVICE_ID); // Xilinx GPIO init call.
if (status != XST_SUCCESS) {
printf("XGPIO_Initialize (TFT) failed\n\r.");
}
status = XGpio_Initialize(&gpioTftDataBus, LCD_DATA_BUS_DEVICE_ID); // Xilinx GPIO init call.
if (status != XST_SUCCESS) {
printf("XGPIO_Initialize (TFT Data Bus) failed\n\r.");
}
// Set the direction for all signals to be outputs (0 = output, 1 = input).
XGpio_SetDataDirection(&gpioTftControl, 1, 0); // Control bits are always outputs.
XGpio_SetDataDirection(&gpioTftDataBus, 1, 0); // Set up data-bus direction as output (write).
mio_init(true);
LCD_negateRd(); // negate the RD control signal.
LCD_negateWr(); // negate the WR control signal.
initFlag = true; // Note that init has been invoked.
}
// Writes 8 bits to the TFT controller.
void LCD_write8(uint8_t value){
LCD_assertWr(); // Assert the WR line.
LCD_writeData(value); // Copy the data out to the MIO pins.
LCD_negateWr(); // Negate WR.
}
// Set the GPIO pins on the LCD data bus for read operations.
void LCD_setReadDataDirection() {
LCD_negateWr(); // Negate the WR pin to be consistent.
XGpio_SetDataDirection(&gpioTftDataBus, 1, 0xFF); // LCD data bus is input from ZYNQ perspective.
}
