print hex FF not working

[riker65]

Hi
I want to print hex FF from charset A00: whole block
running: lcd.write_string('\xFF')

I expected the whole block to be written?

please check

or what am I doing wrong?

Thx

[dbrgn]

With that you will only print the character at position 0xff of the A00 charset. To print the whole block you have to add every character to the string.

To show the entire character map on your LCD, you can also use the show_charmap target of the rplcd-tests script that should get installed together with the RPLCD library.

[dbrgn]

I'll close this, feel free to leave a comment if things are still unclear.

[riker65]

Hi Danilo

maybe I was unclear.
I just want to print one sign. post FF in Charset A00.

But when I do
lcd.write_string('\xFF')
the sign - a single full lcd - is not printed.

How to print the hex FF?

Thanks Thomas

[dbrgn]

Ah, I see. Are you sure that your LCD uses the A00 charset? What character is printed instead?

Are you using Python 2 or 3?

[riker65]

Hi Danilo,

come code:

lcdmode = 'i2c'
cols = 20
rows = 4
charmap = 'A00'
i2c_expander = 'PCF8574'
address = 0x27 # If you don't know what yours is, do i2cdetect -y 1
port = 1 # 0 on an older Pi

i = 0
while i < 20:
    lcd.cursor_pos = (0, 0)
    lcd.write_string('bsxFF:')
    lcd.cursor_pos = (3, i)
    sleep(0.1)
    i = i +1
    lcd.write_string('\xFF')

sleep(2)

nothing is printed.

thanks for checking

[riker65]

running python 2

[dbrgn]

Can you try lcd.write_string(u'\xFF') instead?

[riker65]

Hi,
also nothing printed

[dbrgn]

But does printing regular text work? Have you tried using the rplcd-tests script that's installed with RPLCD?

[riker65]

di not try that
but regular text and custom chars are working fine