shift-reg-led-notes.txt

array of f32s for wanted value of pixel
array of f32s for current pwm value of pixel

https://godbolt.org/z/Yx7bYEqMY

OE is always tied to high
two shift registers are tied together, total 15 bits
SER is input
https://github.com/ManojBR105/Teensy-4.0_digital_parallel_read-write/blob/master/Teensy_4.0_digital_parallel_read_write.ino

600000000 cycles / (125 cycles per iter * 15 bits * 60 fps)
can't go under 25 cycles per pulse or the shift register will die

write the contents of the pwm function all 20 data pins
set SRCLR high (probably should be a separate write)
increment counter
if counter hits 15 bits, set RCLK high (may need to wait another iteration for this)

have a separate timer for frames, if the frame is incremented, reset

srclk = pin 2
rclk = pin 3

9 off
9 red
1 blue


AOI stuff for event register?


PIN   GPIOn-BITm  |  GPIOn-BITm    PIN
------------------|-------------------
00  -> GPIO6-03   |   GIPO6-02  ->  01
01  -> GPIO6-02   |   GIPO6-03  ->  00
02  -> GPIO9-04   |   GIPO6-12  ->  24
03  -> GPIO9-05   |   GIPO6-13  ->  25
04  -> GPIO9-06   |   GIPO6-16  ->  19
05  -> GPIO9-08   |   GIPO6-17  ->  18
06  -> GPIO7-10   |   GIPO6-18  ->  14
07  -> GPIO7-17   |   GIPO6-19  ->  15
08  -> GPIO7-16   |   GIPO6-22  ->  17
09  -> GPIO7-11   |   GIPO6-23  ->  16
10  -> GPIO7-00   |   GIPO6-24  ->  22
11  -> GPIO7-02   |   GIPO6-25  ->  23
12  -> GPIO7-01   |   GIPO6-26  ->  20
13  -> GPIO7-03   |   GIPO6-27  ->  21
14  -> GPIO6-18   |   GIPO6-30  ->  26
15  -> GPIO6-19   |   GIPO6-31  ->  27
16  -> GPIO6-23   |   GIPO7-00  ->  10
17  -> GPIO6-22   |   GIPO7-01  ->  12
18  -> GPIO6-17   |   GIPO7-02  ->  11
19  -> GPIO6-16   |   GIPO7-03  ->  13
20  -> GPIO6-26   |   GIPO7-10  ->  06
21  -> GPIO6-27   |   GIPO7-11  ->  09
22  -> GPIO6-24   |   GIPO7-12  ->  32
23  -> GPIO6-25   |   GIPO7-16  ->  08
24  -> GPIO6-12   |   GIPO7-17  ->  07
25  -> GPIO6-13   |   GIPO8-12  ->  37
26  -> GPIO6-30   |   GIPO8-13  ->  36
27  -> GPIO6-31   |   GIPO8-14  ->  35
28  -> GPIO8-18   |   GIPO8-15  ->  34
29  -> GPIO9-31   |   GIPO8-16  ->  39
30  -> GPIO8-23   |   GIPO8-17  ->  38
31  -> GPIO8-22   |   GIPO8-18  ->  28
32  -> GPIO7-12   |   GIPO8-22  ->  31
33  -> GPIO9-07   |   GIPO8-23  ->  30
34  -> GPIO8-15   |   GIPO9-04  ->  02
35  -> GPIO8-14   |   GIPO9-05  ->  03
36  -> GPIO8-13   |   GIPO9-06  ->  04
37  -> GPIO8-12   |   GIPO9-07  ->  33
38  -> GPIO8-17   |   GIPO9-08  ->  05
39  -> GPIO8-16   |   GIPO9-31  ->  29