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author | Joel Challis <git@zvecr.com> | 2021-03-10 22:47:36 +0000 |
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committer | GitHub <noreply@github.com> | 2021-03-10 22:47:36 +0000 |
commit | 40c7ecfdeaf50ab76e10854a84aebfcb82ddb092 (patch) | |
tree | 035c7d9a905198bdab9a659e653da6d320e1708b /tmk_core/common/chibios/_wait.h | |
parent | 2e24cfadb75b00156acf2827d5643d6c2d55a60c (diff) |
Move gpio wait logic to wait.h (#12067)
Diffstat (limited to 'tmk_core/common/chibios/_wait.h')
-rw-r--r-- | tmk_core/common/chibios/_wait.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/tmk_core/common/chibios/_wait.h b/tmk_core/common/chibios/_wait.h new file mode 100644 index 0000000000..5bface53e1 --- /dev/null +++ b/tmk_core/common/chibios/_wait.h @@ -0,0 +1,55 @@ +/* Copyright 2021 QMK + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ +#pragma once + +#include <ch.h> + +/* chThdSleepX of zero maps to infinite - so we map to a tiny delay to still yield */ +#define wait_ms(ms) \ + do { \ + if (ms != 0) { \ + chThdSleepMilliseconds(ms); \ + } else { \ + chThdSleepMicroseconds(1); \ + } \ + } while (0) +#define wait_us(us) \ + do { \ + if (us != 0) { \ + chThdSleepMicroseconds(us); \ + } else { \ + chThdSleepMicroseconds(1); \ + } \ + } while (0) + +/* For GPIOs on ARM-based MCUs, the input pins are sampled by the clock of the bus + * to which the GPIO is connected. + * The connected buses differ depending on the various series of MCUs. + * And since the instruction execution clock of the CPU and the bus clock of GPIO are different, + * there is a delay of several clocks to read the change of the input signal. + * + * Define this delay with the GPIO_INPUT_PIN_DELAY macro. + * If the GPIO_INPUT_PIN_DELAY macro is not defined, the following default values will be used. + * (A fairly large value of 0.25 microseconds is set.) + */ + +#include "wait.c" + +#ifndef GPIO_INPUT_PIN_DELAY +# define GPIO_INPUT_PIN_DELAY (STM32_SYSCLK / 1000000L / 4) +#endif + +#define waitInputPinDelay() wait_cpuclock(GPIO_INPUT_PIN_DELAY) |