Mark Stephens

Update Raspberry Pi Hardware detection

3

https://elinux.org/RPi_HardwareHistory documents the current board revisions for various Raspberry Pi models. Notably this has been updated since hwio Raspberry Pi driver was last updated. Update the library to handle all...

This depends on: - SPI - interupt - optionally reading accelerometer values as analog. Requires external resistors to constrain analog voltage 0-1.8V - may be able to ignore SD_SEL, as...

hd44780 does not work on PCF8574 based port extenders

1

as discussed on http://forum.arduino.cc/index.php?topic=158312.15 there are at least two variations of port extenders with different pin mappings to the LCD display itself.

This might come under "unsafe" module territory, as kernel drivers don't appear to support pud configuration. Need to test if this works reliably, and provide a way for consumer to...

Add an unsafe GPIO module that uses memory mapped IO, for speed. Related to pud issue.

Will probably need to resort to memory-mapped IO for this, there doesn't appear to be a standard kernel module.

determine how to get precise fixed-duration timing

2

I tested driving a TLC5940 using GPIO, but got a flickery display, I think because GPIO could not get consistent timing and was subject to process pre-emption and file system...