Page 140 - The Unofficial Guide to Lego Mindstorms Robots

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LCD_REFRESH ( -- )
Use this word after making changes to the display. The state of the display will not change until you call LCD_REFRESH.

Figure 6-3.
The RCX's display

pbFORTH can displa y a number from the stack with the following word:

L CD_NUMBER (decimal value signed -- )
This word shows the number value on the display. The decimal parameter controls the location of the decimal point, if
t here is one, while the signed parameter determines whether value is shown as signed or unsigned. The acceptable values
of decimal and signed are shown in Table 6-5 and Table 6-6.

Table 6-5. Values for the decimal Parameter of LCD_NUMBER

Value (in hexadecimal) Description

3002 No decimal point

3003 One digit after the decimal point

3004 Two digits after the decimal point

3005 Three digits after the decimal point

any value Single digit on the right of the display (use 3017 for signed)

Table 6-6. Values for the signe d Parameter of LCD_NUMBER

Value (i n hexadecimal) Description

3001 Signed, no leading zeros

301F Unsigned with leading zeros

3017 Single digit on the right of the display (ignores decimal)

For example, to display the num ber -4198, use the following:

3002 -1066 3001 LCD_NUMBER LCD_REFRESH