void ST7920LCDDriver::begin(bool gmode)
{
// Set up the SPI interface for talking to the LCD. We have to set MOSI, SCLK and SS to outputs, then enable SPI.
digitalWrite(clockPin, LOW);
digitalWrite(dataPin, LOW);
pinMode(clockPin, OUTPUT);
pinMode(dataPin, OUTPUT);
if (useSpi)
{
SPCR = (1 << SPE) | (1 << MSTR) | (1 << SPR0); // enable SPI, master mode, clock low when idle, data sampled on rising edge, clock = f/16 (= 1MHz), send MSB first
//SPSR = (1 << SPI2X); // double the speed to 2MHz (optional)
}
gfxMode = false;
sendLcdCommand(LcdFunctionSetBasicAlpha);
delay(1);
sendLcdCommand(LcdFunctionSetBasicAlpha);
commandDelay();
sendLcdCommand(LcdEntryModeSet);
commandDelay();
extendedMode = false;
gfxMode = true;
sendLcdCommand(LcdDisplayOn);
commandDelay();
}
//------------------------------------------------------------------------------
void lcdl_exit(void)
{
lcdl_clear();
sendLcdCommand(deviceHandle_l, kLcdCmdDisplayOff, NULL);
sendLcdCommand(deviceHandle_l, kLcdCmdBlinkingCursorOff, NULL);
alt_i2c_disable(deviceHandle_l);
alt_i2c_uninit(deviceHandle_l);
}
//------------------------------------------------------------------------------
void lcdl_clear(void)
{
// Clear screen
if (sendLcdCommand(deviceHandle_l, kLcdCmdClearScreen, NULL) != ALT_E_SUCCESS)
{
DEBUG_LVL_ERROR_TRACE("LCD ERR: Failed to clear screen\n");
}
}
void ST7920LCDDriver::ensureExtendedMode()
{
if (!extendedMode)
{
sendLcdCommand(gfxMode ? LcdFunctionSetExtendedGraphic : LcdFunctionSetExtendedAlpha);
commandDelay();
extendedMode = true;
}
}
void ST7920LCDDriver::ensureBasicMode()
{
if (extendedMode)
{
sendLcdCommand(gfxMode ? LcdFunctionSetBasicGraphic : LcdFunctionSetBasicAlpha);
commandDelay();
extendedMode = false;
}
}
void ST7920LCDDriver::setGraphicsAddress(unsigned int r, unsigned int c)
{
if (gfxMode)
{
ensureExtendedMode();
sendLcdCommand(LcdSetGdramAddress | (r & 31));
//commandDelay(); // don't seem to need this one
sendLcdCommand(LcdSetGdramAddress | c | ((r & 32) >> 2));
commandDelay(); // we definitely need this one
}
}
//------------------------------------------------------------------------------
INT lcdl_changeToLine(unsigned INT line_p)
{
UINT8 param;
if (line_p < 2)
param = LCD_POS_1ST_LINE;
else
param = LCD_POS_2ND_LINE;
if (sendLcdCommand(deviceHandle_l, kLcdCmdSetCursor, ¶m) != ALT_E_SUCCESS)
return -1;
else
return 0;
}
//------------------------------------------------------------------------------
void lcdl_init(void)
{
INT ret = 0;
ALT_I2C_MASTER_CONFIG_t cfg;
UINT32 speed;
// Init I2C module
if (alt_i2c_init(ALT_I2C_I2C0, deviceHandle_l) != ALT_E_SUCCESS)
{
ret = -1;
goto Exit;
}
if (alt_i2c_enable(deviceHandle_l) != ALT_E_SUCCESS) // Enable I2C module
{
ret = -1;
goto Exit;
}
if (alt_i2c_master_config_get(deviceHandle_l, &cfg) != ALT_E_SUCCESS) // Configure I2C module
{
ret = -1;
goto Exit;
}
if (alt_i2c_master_config_speed_get(deviceHandle_l, &cfg, &speed) != ALT_E_SUCCESS)
{
ret = -1;
goto Exit;
}
PRINTF("LCD INFO: Current I2C speed = %d Hz.\n", (INT)speed);
if (alt_i2c_master_config_speed_set(deviceHandle_l, &cfg, LCD_I2C_SPEED) != ALT_E_SUCCESS)
{
ret = -1;
goto Exit;
}
if (alt_i2c_master_config_speed_get(deviceHandle_l, &cfg, &speed) != ALT_E_SUCCESS)
{
ret = -1;
goto Exit;
}
else
{
PRINTF("LCD INFO: New I2C speed = %d Hz.\n", (INT)speed);
cfg.addr_mode = ALT_I2C_ADDR_MODE_7_BIT;
cfg.restart_enable = ALT_E_TRUE;
if (alt_i2c_master_config_set(deviceHandle_l, &cfg) != ALT_E_SUCCESS)
{
ret = -1;
goto Exit;
}
if (alt_i2c_sda_hold_time_set(deviceHandle_l, 8) != ALT_E_SUCCESS)
{
ret = -1;
goto Exit;
}
if (alt_i2c_master_target_set(deviceHandle_l, LCD_I2C_ADDRESS) != ALT_E_SUCCESS) // Set target display I2C address
{
ret = -1;
goto Exit;
}
if (sendLcdCommand(deviceHandle_l, kLcdCmdDisplayOn, NULL) != ALT_E_SUCCESS) // Turn display on
{
ret = -1;
goto Exit;
}
if (sendLcdCommand(deviceHandle_l, kLcdCmdBlinkingCursorOn, NULL) != ALT_E_SUCCESS) // Turn cursor on
{
ret = -1;
goto Exit;
}
else
ret = 0;
}
Exit:
if (ret != 0)
DEBUG_LVL_ERROR_TRACE("LCD ERR: Initialization Failed!!\n");
return;
}
