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lcd_st7920: Use a longer delay at the start of each command/data

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It appears the st7920 requires a longer delay when switching from
command to data mode (and vice-versa).  Slower MCUs don't show a
problem because the klipper command processing time results in a
sufficient delay.  However, some of the faster MCUs can process
klipper commands fast enough that the next st7920 transfer is sent too
fast.  Add an additional delay to account for this.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2018-06-22 22:07:48 -04:00
parent 74de181e59
commit f08a0c5e93
4 changed files with 33 additions and 22 deletions
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4
config/example-extras.cfg
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@ -539,10 +539,6 @@
#sid_pin:
# The pins connected to an st7920 type lcd. These parameters must be
# provided when using an st7920 display.
#chip_delay:
# This parameter specifies the internal command delay (in seconds)
# on st7920 displays. It may be necessary to increase this if the
# display shows garbled data. The default is 0.000020.
# Custom thermistors (one may define any number of sections with a