[Keymap] Jarred's Plaid keymap (#6049)

[qmk_firmware.git] / docs / ref_functions.md

diff --git a/docs/ref_functions.md b/docs/ref_functions.md
index 9b5be7a883ff9912247d300932320c9a99888a4a..174d9a95a6f432b012e200ce29c60c8f2e015c98 100644 (file)
--- a/docs/ref_functions.md
+++ b/docs/ref_functions.md
@@ -96,3 +96,24 @@ And to do so, add `reset_keyboard()` to your function or macro, and this will re
 If you're having issues with Audio, RGB Underglow, backlighting or keys acting weird, then you can reset the EEPROM (persistent setting storage).  Bootmagic is one way to do this, but if that isn't enabled, then you can use a custom macro to do so.
 
 To wipe the EEPROM, run `eeconfig_init()` from your function or macro to reset most of the settings to default.
+
+## Tap random key
+
+If you want to send a random character to the host computer, you can use the `tap_random_base64()` function. This [pseudorandomly](https://en.wikipedia.org/wiki/Pseudorandom_number_generator) selects a number between 0 and 63, and then sends a key press based on that selection. (0–25 is `A`–`Z`, 26–51 is `a`–`z`, 52–61 is `0`–`9`, 62 is `+` and 63 is `/`).  
+
+?> Needless to say, but this is _not_ a cryptographically secure method of generating random Base64 keys or passwords.
+
+## Software Timers
+
+It's possible to start timers and read values for time-specific events. Here's an example:
+
+```c
+static uint16_t key_timer;
+key_timer = timer_read();
+
+if (timer_elapsed(key_timer) < 100) {
+  // do something if less than 100ms have passed
+} else {
+  // do something if 100ms or more have passed
+}
+```