void vLCDTask( void * pvParameters )
{
unsigned portBASE_TYPE uxIndex;
const unsigned char ucCFGData[] = {
0x30, /* Set data bus to 8-bits. */
0x30,
0x30,
0x3C, /* Number of lines/font. */
0x08, /* Display off. */
0x01, /* Display clear. */
0x06, /* Entry mode [cursor dir][shift]. */
0x0C /* Display on [display on][curson on][blinking on]. */
};
/* The strings that are written to the LCD. */
const char *pcStringsToDisplay[] = {
"Stellaris",
"Demo",
"One",
"www.FreeRTOS.org",
""
};
/* Configure the LCD. */
uxIndex = 0;
while( uxIndex < sizeof( ucCFGData ) )
{
prvPDCWrite( PDC_LCD_CSR, ucCFGData[ uxIndex ] );
uxIndex++;
vTaskDelay( mainCHAR_WRITE_DELAY );
}
/* Turn the LCD Backlight on. */
prvPDCWrite( PDC_CSR, 0x01 );
/* Clear display. */
vTaskDelay( mainCHAR_WRITE_DELAY );
prvPDCWrite( PDC_LCD_CSR, LCD_CLEAR );
uxIndex = 0;
for( ;; )
{
/* Display the string on the LCD. */
prvWriteString( pcStringsToDisplay[ uxIndex ] );
/* Move on to the next string - wrapping if necessary. */
uxIndex++;
if( *( pcStringsToDisplay[ uxIndex ] ) == 0x00 )
{
uxIndex = 0;
/* Longer pause on the last string to be sent. */
vTaskDelay( mainSTRING_WRITE_DELAY * 2 );
}
/* Wait until it is time to move onto the next string. */
vTaskDelay( mainSTRING_WRITE_DELAY );
}
}
static void prvWriteString( const char *pcString )
{
/* Write pcString to the LED, pausing between each character. */
prvPDCWrite(PDC_LCD_CSR, LCD_CLEAR);
while( *pcString ) {
vTaskDelay( mainCHAR_WRITE_DELAY );
prvPDCWrite( PDC_LCD_RAM, *pcString );
pcString++;
}
}
void prvLCDTask( void * pvParameters )
{
unsigned portBASE_TYPE uxIndex;
xQueueHandle *pxLCDQueue;
xLCDMessage xReceivedMessage;
char *pcString;
const unsigned char ucCFGData[] = {
0x30, /* Set data bus to 8-bits. */
0x30,
0x30,
0x3C, /* Number of lines/font. */
0x08, /* Display off. */
0x01, /* Display clear. */
0x06, /* Entry mode [cursor dir][shift]. */
0x0C /* Display on [display on][curson on][blinking on]. */
};
/* To test the parameter passing mechanism, the queue on which messages are
received is passed in as a parameter even though it is available as a file
scope variable anyway. */
pxLCDQueue = ( xQueueHandle * ) pvParameters;
/* Configure the LCD. */
uxIndex = 0;
while( uxIndex < sizeof( ucCFGData ) )
{
prvPDCWrite( PDC_LCD_CSR, ucCFGData[ uxIndex ] );
uxIndex++;
vTaskDelay( mainCHAR_WRITE_DELAY );
}
/* Turn the LCD Backlight on. */
prvPDCWrite( PDC_CSR, 0x01 );
/* Clear display. */
vTaskDelay( mainCHAR_WRITE_DELAY );
prvPDCWrite( PDC_LCD_CSR, LCD_CLEAR );
uxIndex = 0;
for( ;; )
{
/* Wait for a message to arrive. */
if( xQueueReceive( *pxLCDQueue, &xReceivedMessage, portMAX_DELAY ) )
{
/* Which row does the received message say to write to? */
PDCLCDSetPos( 0, xReceivedMessage.xRow );
/* Where is the string we are going to display? */
pcString = *xReceivedMessage.ppcMessageToDisplay;
while( *pcString )
{
/* Don't write out the string too quickly as LCD's are usually
pretty slow devices. */
vTaskDelay( mainCHAR_WRITE_DELAY );
prvPDCWrite( PDC_LCD_RAM, *pcString );
pcString++;
}
}
}
}
