Penguin B Numbers - Using the New Display

Humanoido

"Penguin B" Numbers Display Program

Control the seven segment display with just three lines
instead of four, using the 74HC595 Serial In Parallel Out
shift register



I wrote several Penguin B programs for the new display a year
ago and just took some time diversion from the Brain project to
update the code. The first code presented is a number and decimal
point program. Other programs will follow for text messages,
graphics, and the English alphabet. The code comments show
clearly how the characters are generated and a display driver is
included along with a timer, output stabilizer, screen blanker
and latch.

penguinb_numbers.bpx

The second program is similar except the numbers appear in a loop.

penguinb_numbers_continue.bpx

' The attached program has all the tools necessary to count numbers
' from 1 through 9 and show a decimal point for making fractional numerical
' representations. It also calculates the decimal value and shows it
' on the Debug screen. This is handy if you prefer to work with
' decimals instead of binary numbers. The code comments simplify the
' method for creating additional characters using the Binary number
' approach. See other Humanoido programs for Penguin to create text
' messages, reproduce the English alphabet and make graphic characters.
' 
' The idea is to control the seven segment display with just three lines
' instead of four, using the 74HC595 "serial in parallel out" shift register.
' I'm happy to say the idea has come to frution. The 74HC595 design converts
' a synchronous serial data stream to eight parallel outputs, namely seven
' segments and one decimal point.
' 
' The synchronous serial data has components to program, mainly the serial
' data and the serial clock. The SHIFOUT command is chosen to handle these
' details and write data to the synchronous chip. After the shifting process,
' the data must be latched to the outputs by momentarily pulsing the Latch
' control line. This will stabilize the outputs as new data is shifted in,
' and is accomplished with a PULSOUT statement. Shiftout is LSB least
' significant bit first.