adding dependencies

2022-10-10 12:39:30 +01:00
parent 0e8e1e4db6
commit 2327ae7aab
867 changed files with 137599 additions and 0 deletions
@@ -0,0 +1,50 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2017 Karl Palsson <karlp@tweak.net.au>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * This file implements some simple busy timers.  They are designed to be
+ * portable, not performant.
+ * TIM6 is appropriated for usage.
+ */
+#include <stdint.h>
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/timer.h>
+
+#include "delay.h"
+
+void delay_setup(void)
+{
+	/* set up a microsecond free running timer for ... things... */
+	rcc_periph_clock_enable(RCC_TIM6);
+	/* microsecond counter */
+	timer_set_prescaler(TIM6, rcc_apb1_frequency / 1000000 - 1);
+	timer_set_period(TIM6, 0xffff);
+	timer_one_shot_mode(TIM6);
+}
+
+void delay_us(uint16_t us)
+{
+	TIM_ARR(TIM6) = us;
+	TIM_EGR(TIM6) = TIM_EGR_UG;
+	TIM_CR1(TIM6) |= TIM_CR1_CEN;
+	//timer_enable_counter(TIM6);
+	while (TIM_CR1(TIM6) & TIM_CR1_CEN);
+}
+
+