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Fix errors with matrix_output_unselect_delay function calls (#13645)

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This commit is contained in:
Drashna Jaelre
2021-07-22 21:42:59 -07:00
committed by GitHub
parent 750f40566a
commit 816accda3d
5 changed files with 59 additions and 58 deletions
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26
keyboards/kinesis/kint41/kint41.c
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@@ -32,21 +32,21 @@ void matrix_init_kb(void) {
// ChibiOS enables the cycle counter in chcore_v7m.c:
// https://github.com/ChibiOS/ChibiOS/blob/b63023915c304092acb9f33bbab40f3ec07a7f0e/os/common/ports/ARMCMx/chcore_v7m.c#L263
static void delay_inline(const uint32_t cycles) {
const uint32_t start = DWT->CYCCNT;
while ((DWT->CYCCNT - start) < cycles) {
// busy-loop until time has passed
}
const uint32_t start = DWT->CYCCNT;
while ((DWT->CYCCNT - start) < cycles) {
// busy-loop until time has passed
}
}
void matrix_output_unselect_delay(void) {
// Use the cycle counter to do precise timing in microseconds. The ChibiOS
// thread sleep functions only allow sleep durations starting at 1 tick, which
// is 100μs in our configuration.
void matrix_output_unselect_delay(uint8_t line, bool key_pressed) {
// Use the cycle counter to do precise timing in microseconds. The ChibiOS
// thread sleep functions only allow sleep durations starting at 1 tick, which
// is 100μs in our configuration.
// Empirically: e.g. 5μs is not enough, will result in keys that don’t work
// and ghost key presses. 10μs seems to work well.
// Empirically: e.g. 5μs is not enough, will result in keys that don’t work
// and ghost key presses. 10μs seems to work well.
// 600 cycles at 0.6 cycles/ns == 1μs
const uint32_t cycles_per_us = 600;
delay_inline(10 * cycles_per_us);
// 600 cycles at 0.6 cycles/ns == 1μs
const uint32_t cycles_per_us = 600;
delay_inline(10 * cycles_per_us);
}