net-o-meter/code-notes at master · londonhackspace/net-o-meter · GitHub

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p5 -> data
p6 -> ?
p7 -> clock


p27 -> input, busy
p28 -> serial data in
p29 -> clock
p30 -> latch

http://mbed.org/handbook/Timeout
http://mbed.org/handbook/InterruptIn

Timeout does us, so 1 us wait?


bits, most significant 1st:

d7
d6
d5
d4
d3
d2
d1
d0

WR	low -> high to send data or command
a0	data/command
rd	1
ss	0 // clockish
BL	1 // blank
reset	1
nc
nc


vfd debug:

00111101010110000
76543210warstblrn

expecting:

10101010?01?11110
76543210warstblrn

\ = Yen sign


E M F

clear()
start()


0xea = /tri
0xeb = tri\
0xec = tri/
0xed = \tri

0x0c = clear screen
0x7f = solid
0x1e = double v line
0x1f = triple h line
0xee = half height block (top)
0xef = half height block (bottom)

0xf8 = £
0xfa = degC
0xfb = ~

0xfd = \
0xfe = ?
0xff = ?

charset is mostly JIS X 0201

cols 1010, 1011, 1100, 1101 are JIS X 0201

http://www.sljfaq.org/afaq/half-width-katakana.html


to put in data:

data, ss low, wr low
wait 100ns
wr high
wait 10ns
ss high
busy should be high now.

for normal ops:

reset is high
bl is high
wr is low - we don't do any reading.
rd is high
ss is low

op codes:

0x00 - 0x4f - set write position


set position:

0x1b
row (counting from 0 at the top)
column (0-19)