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Posted 27 Feb 2009

LCD with USB Toolstick c8051

, 22 Mar 2009
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LCD with USB Toolstick c8051


This is a LCD (MC20E2D-SYL) 8-bit 2x20 LCD module with Silabs 'toolstick dauther (F330)' updated with new firmware (in '' - LCD controller) and 'debug adapter(F321)' (also known as 'toolstick EK') made unit.




With that, you can send text to display connected through USB debug adapter.

Prototype board:
To use 'usbhidio' you must update firmware for 'debug adapter'.
Toolstick --really is named 'Debug adapter' firmware in download section at the top
(to update use 'toolstick base adapter').
On desktop, run usbhidio2.exe (VB6) and type text on screen. Make sure that baud is 9600 and you are ready.

Software can be modified and run independently by supplying power.
Connections are seen on this page:


I made it like this:

<------------------ 'Toolstick F330'-----------------> <---Display--->
P1.0 to P1.7 P0.6 P0.7 P0.4(TX) P0.5(RX) VDD(3V) GRD&RW 5V
^ ^ ^ ^ ? ^ ^ ^ ^
DB0 to DB7 EN RS RX(25) TX(26) PIN6 GRD USB

<--------Display-------> <------------- 'Debug adapter F321'------------>

To adjust background, replace resistor 1,5K between GRD and VEE(PIN3) on LCD.
Also on LCD input RW(PIN5) is tied to GRD.
See the image below for connections:

Click to enlarge image

This is a very small and accurate job - thus that can't solder- don't bother to.


Take a look at the previous article Counter based c8051 and this CodeProject article LCD with parallel port.
Take a look at the next article USB IR with c8051.

Using the Code

On desktop application, just press enter on textbox to display data on LCD - For those that are interested in the code - here is the main routine:

void main (void)
    uchar i;
    uchar j;
    uchar dummy;
    PCA0MD &= ~0x40; 		// Clear watchdog timer enable
    Timer0_Init (); 		// Initialize the Timer0
    Port_Init (); 			// Init Ports
    //SYSCLK_Init (); 		// Initialize Oscillator
    EA = TRUE; 			// Enable global interrupts
    LCD_RS = 0;
    LCD_RW = 0;
    TimerStart( SYS_TIMER, 500 ); 	// wait for display to wake up
    while( !TimerReady( SYS_TIMER ));
    move_to_specific(2, 1);
    LCD_sendstring("LCD second string");
    TimerStart( SYS_TIMER, 1000 ); 	// wait for display to wake up
    while( !TimerReady( SYS_TIMER ));
        if(TX_Ready == 1 && UART_Buffer_Size != 0 && Byte == 13)
           for(i = 0; i < (UART_Buffer_Size - 1); i++ ){ // Initialize software timers.
               {    //line full 
                    move_to_specific(2, 1);
                    j -= 20; } LCD_senddata(UART_Buffer[i]); j++;
               TX_Ready = 0; 	// Set the flag to zero
               TI0 = 1; 		// Set transmit flag to 1
    } 				// Loop forever

Points of Interest

There are a lot of samples on the internet, but it is hard to find an article about displaying text through USB and using 8-bit LCD like MC20E2D-SYL.


  • 27th February, 2009: Initial post
  • 19th March, 2009: Article updated


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

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Comments and Discussions

GeneralMy vote of 5 Pin
Mic8-Aug-13 13:57
memberMic8-Aug-13 13:57 
Generalcomments Pin
Shane Story2-Mar-09 7:42
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GeneralRe: comments Pin
Markbanang23-Mar-09 2:45
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GeneralRe: comments Pin
Shane Story23-Mar-09 2:49
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GeneralRe: comments Pin
Shane Story23-Mar-09 2:51
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GeneralRe: comments Pin
Rick York24-Mar-09 11:38
memberRick York24-Mar-09 11:38 
Generalinteresting Pin
Luc Pattyn27-Feb-09 9:53
mvpLuc Pattyn27-Feb-09 9:53 
GeneralRe: interesting Pin
ingvar81-Mar-09 22:27
memberingvar81-Mar-09 22:27 
GeneralRe: interesting Pin
ingvar81-Mar-09 23:05
memberingvar81-Mar-09 23:05 

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