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| author | tmk <tmk@users.noreply.github.com> | 2014-03-25 01:01:43 +0100 |
|---|---|---|
| committer | tmk <tmk@users.noreply.github.com> | 2014-03-25 01:01:43 +0100 |
| commit | 43669fb27060de485017cf6258901210a5bee07c (patch) | |
| tree | 3ecfbe1e1b4ff905448aad9519cb423e54f27fea /FAQ.md | |
| parent | 01a218f36b0dd60c01e2198ea47e54a88c78ff89 (diff) | |
| download | qmk_firmware-43669fb27060de485017cf6258901210a5bee07c.tar.gz qmk_firmware-43669fb27060de485017cf6258901210a5bee07c.tar.xz | |
Updated FAQ (markdown)
Diffstat (limited to 'FAQ.md')
| -rw-r--r-- | FAQ.md | 19 |
1 files changed, 19 insertions, 0 deletions
@@ -88,3 +88,22 @@ Use `1UL<<16` intead of `1<<16` in `read_cols()` in **matrix.h** when your colum In C `1` means one of **int** type which is **16bit** in case of AVR so you can't shift left more than 15. You will get unexpected zero when you say `1<<16`. You have to use **unsigned long** type with `1UL`. http://deskthority.net/workshop-f7/rebuilding-and-redesigning-a-classic-thinkpad-keyboard-t6181-60.html#p146279 + + + +## Pull-up Resistor +In some case converters needed to have pull-up resistors to work correctly. Place the resistor between VCC and signal line in parallel. + +``` +Keyboard Conveter + ,------. +5V------+------|VCC | + | | | + R | | + | | | +Signal--+------|PD0 | + | | +GND------------|GND | + `------' +R: 1K Ohm resistor +```
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