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authorStefan Kerkmann <karlk90@pm.me>2022-07-11 15:17:05 +0200
committerGitHub <noreply@github.com>2022-07-11 15:17:05 +0200
commit3f5dc472965e6a5b8efe60e33c7b6c2d18d92008 (patch)
treec60357db5312ccbaae608c47edd77982ad1c17ad /keyboards/handwired/onekey/keymaps
parent57021d63582718635f87ba661f40683e98ba59da (diff)
[Core] Use polled waiting on ChibiOS platforms that support it (#17607)
* Use polled waiting on platforms that support it Due to context switching overhead waiting a very short amount of time on a sleeping thread is often not accurate and in fact not usable for timing critical usage i.e. in a driver. Thus we use polled waiting for ranges in the us range on platforms that support it instead. The fallback is the thread sleeping mechanism. This includes: * ARM platforms with CYCCNT register (ARMv7, ARMv8) this is incremented at CPU clock frequency * GD32VF103 RISC-V port with CSR_MCYCLE register this is incremented at CPU clock frequency * RP2040 ARMv6 port which uses the integrated timer peripheral which is incremented with a fixed 1MHz frequency * Use wait_us() instead of chSysPolledDelayX ...as it is powered by busy waiting now. * Add chibios waiting methods test bench
Diffstat (limited to 'keyboards/handwired/onekey/keymaps')
-rw-r--r--keyboards/handwired/onekey/keymaps/chibios_waiting_test/config.h12
-rw-r--r--keyboards/handwired/onekey/keymaps/chibios_waiting_test/keymap.c47
2 files changed, 59 insertions, 0 deletions
diff --git a/keyboards/handwired/onekey/keymaps/chibios_waiting_test/config.h b/keyboards/handwired/onekey/keymaps/chibios_waiting_test/config.h
new file mode 100644
index 0000000000..0c75fa3044
--- /dev/null
+++ b/keyboards/handwired/onekey/keymaps/chibios_waiting_test/config.h
@@ -0,0 +1,12 @@
+// Copyright 2022 Stefan Kerkmann
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#if !defined(QMK_WAITING_TEST_BUSY_PIN)
+# define QMK_WAITING_TEST_BUSY_PIN A8
+#endif
+
+#if !defined(QMK_WAITING_TEST_YIELD_PIN)
+# define QMK_WAITING_TEST_YIELD_PIN A9
+#endif
diff --git a/keyboards/handwired/onekey/keymaps/chibios_waiting_test/keymap.c b/keyboards/handwired/onekey/keymaps/chibios_waiting_test/keymap.c
new file mode 100644
index 0000000000..ecf67d3b3c
--- /dev/null
+++ b/keyboards/handwired/onekey/keymaps/chibios_waiting_test/keymap.c
@@ -0,0 +1,47 @@
+// Copyright 2022 Stefan Kerkmann
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {LAYOUT_ortho_1x1(KC_A)};
+
+#if defined(__AVR__)
+# pragma message "AVR uses polled waiting by default, running theses tests will not show any difference"
+static inline void chThdSleepMicroseconds(uint32_t us) {
+ wait_us(us);
+}
+#endif
+
+void keyboard_post_init_user(void) {
+ setPinOutput(QMK_WAITING_TEST_BUSY_PIN);
+ setPinOutput(QMK_WAITING_TEST_YIELD_PIN);
+}
+
+static inline void wait_us_polling_with_strobe(uint32_t us) {
+ writePinHigh(QMK_WAITING_TEST_BUSY_PIN);
+ wait_us(us);
+ writePinLow(QMK_WAITING_TEST_BUSY_PIN);
+}
+
+static inline void wait_us_yield_with_strobe(uint32_t us) {
+ writePinHigh(QMK_WAITING_TEST_YIELD_PIN);
+ chThdSleepMicroseconds(us);
+ writePinLow(QMK_WAITING_TEST_YIELD_PIN);
+}
+
+static const uint32_t waiting_values[] = {0, 1, 5, 10, 25, 50, 100, 150, 200, 500, 1000};
+
+void housekeeping_task_user(void) {
+ static uint32_t last_bench = 0;
+ if (timer_elapsed32(last_bench) > 500) {
+ for (int i = 0; i < (sizeof(waiting_values) / sizeof(waiting_values[0])); i++) {
+ wait_us_polling_with_strobe(waiting_values[i]);
+ wait_us(10);
+ }
+ for (int i = 0; i < (sizeof(waiting_values) / sizeof(waiting_values[0])); i++) {
+ wait_us_yield_with_strobe(waiting_values[i]);
+ wait_us(10);
+ }
+ last_bench = timer_read32();
+ }
+}