qmk_firmware

QMK firmware for my keyboards (Corne, Sweep Ferris) and trackball (Ploopy Adept)
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wait.c (1308B)

      1 /* Copyright 2021 QMK
      2  *
      3  * This program is free software: you can redistribute it and/or modify
      4  * it under the terms of the GNU General Public License as published by
      5  * the Free Software Foundation, either version 3 of the License, or
      6  * (at your option) any later version.
      7  *
      8  * This program is distributed in the hope that it will be useful,
      9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     11  * GNU General Public License for more details.
     12  *
     13  * You should have received a copy of the GNU General Public License
     14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
     15  */
     16 
     17 #include <ch.h>
     18 #include <hal.h>
     19 
     20 #include "_wait.h"
     21 
     22 #ifdef WAIT_US_TIMER
     23 void wait_us(uint16_t duration) {
     24     static const GPTConfig gpt_cfg = {.frequency = 1000000}; /* 1MHz timer, no callback */
     25 
     26     if (duration == 0) {
     27         duration = 1;
     28     }
     29 
     30     /*
     31      * Only use this timer on the main thread;
     32      * other threads need to use their own timer.
     33      */
     34     if (chThdGetSelfX() == &(currcore->mainthread) && duration < (1ULL << (sizeof(gptcnt_t) * 8))) {
     35         gptStart(&WAIT_US_TIMER, &gpt_cfg);
     36         gptPolledDelay(&WAIT_US_TIMER, duration);
     37     } else {
     38         chThdSleepMicroseconds(duration);
     39     }
     40 }
     41 #endif