初始化提交

2024-07-20 22:09:06 +08:00
commit c247dd07a6
6876 changed files with 2743096 additions and 0 deletions
--- a/arduino-cli/libraries/FreqCount/FreqCount.cpp
+++ b/arduino-cli/libraries/FreqCount/FreqCount.cpp
@@ -0,0 +1,119 @@
+/* FreqCount Library, for measuring frequencies
+ * http://www.pjrc.com/teensy/td_libs_FreqCount.html
+ * Copyright (c) 2014 PJRC.COM, LLC - Paul Stoffregen <paul@pjrc.com>
+ *
+ * Version 1.1
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "FreqCount.h"
+#include "util/FreqCountTimers.h"
+
+static uint16_t count_msw;
+static uint32_t count_prev;
+static volatile uint32_t count_output;
+static volatile uint8_t count_ready;
+static uint16_t gate_length;
+static uint16_t gate_index;
+
+
+void FreqCountClass::begin(uint16_t msec)
+{
+	if (msec < 1) return;
+	gate_index = 0;
+	count_msw = 0;
+	count_prev = 0;
+	count_ready = 0;
+	counter_init();
+	gate_length = timer_init(msec);
+	uint8_t status = SREG;
+	cli();
+	timer_start();
+	timer_isr_latency_delay();
+	counter_start();
+	SREG = status;
+}
+
+uint8_t FreqCountClass::available(void)
+{
+	return count_ready;
+}
+
+uint32_t FreqCountClass::read(void)
+{
+	uint32_t count;
+	uint8_t status;
+
+	status = SREG;
+	cli();
+#if defined(TIMER_USE_TIMER2) && F_CPU == 12000000L
+	float correct = count_output * 0.996155;
+	count = (uint32_t) (correct+0.5);
+#else
+	count = count_output;
+#endif
+	count_ready = 0;
+	SREG = status;
+	return count;
+}
+
+void FreqCountClass::end(void)
+{
+	timer_shutdown();
+	counter_shutdown();
+}
+
+
+ISR(TIMER_ISR_VECTOR)
+{
+	uint16_t lsw, msw;
+	uint32_t count;
+	uint16_t index, length;
+
+	lsw = counter_read();
+	msw = count_msw;
+	if (counter_overflow()) {
+		counter_overflow_reset();
+		if (lsw < 0xFA00) {
+			msw = msw + 1;
+			count_msw = msw;
+		} else {
+			count_msw = msw + 1;
+		}
+	}
+	index = gate_index + 1;
+	length = gate_length;
+	if (index >= length) {
+		gate_index = 0;
+		count = ((uint32_t)msw << 16) + lsw;
+		count_output = count - count_prev;
+		count_prev = count;
+		count_ready = 1;
+		restore_other_interrupts();
+	} else {
+		if (index == length - 1) disable_other_interrupts();
+		gate_index = index;
+	}
+}
+
+
+FreqCountClass FreqCount;
+
+