diff options
| author | Karl Palsson <karlp@tweak.net.au> | 2018-02-20 22:01:22 +0000 |
|---|---|---|
| committer | Karl Palsson <karlp@tweak.net.au> | 2018-02-20 22:01:22 +0000 |
| commit | 427cdf423b659f4e591dc0d8a416828124814598 (patch) | |
| tree | f90536b2dc1610267997c880436105e3c86d2479 | |
| parent | d5fd0d101240152d14ac3a8c27dbebbc1ce471e4 (diff) | |
| download | olsndot-427cdf423b659f4e591dc0d8a416828124814598.tar.gz olsndot-427cdf423b659f4e591dc0d8a416828124814598.tar.bz2 olsndot-427cdf423b659f4e591dc0d8a416828124814598.zip | |
hw1: notes from assembling first board.
| -rw-r--r-- | hw1/README | 21 |
1 files changed, 14 insertions, 7 deletions
@@ -7,10 +7,17 @@ cheap FX2based logic analysers, allowing automatic tests to be written that use sigrok to check that the signals on the wire match expectations. -TODO: -Check i2c conns to target board! (drop the unused one!) -VCC routing (and recommended mic5504 routing) -ground pours in kicad -reshuffle LA conn -gerber generation? - +Notes on assembly hw1-a: +* 16Mhz crystal, 15pf load caps, and 3k7 i2c pullups + (why don't I have 4k7 0603 resistors lying around? who knows!) +* A power LED wouldn't hurt. +* Adding a red/green user led wouldn't hurt for test pass/fail, even though + it's meant to be autotest +* maybe a fet to turn on/off the i2c pull ups programatically? + (maybe just a single jumper? is there really any need for individual control + of the pullups?) +* move stlink connector 90° or just down and tuck it in, so we can pull the + edge in. It overlaps the buttons on the nucleos, and requires longer + pins than necessary otherwise. +* Add some ground pads for test points, just in general. Test points good, + more test points better. |