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| author | utzig <utzig@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2014-06-29 23:06:17 +0000 |
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| committer | utzig <utzig@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2014-06-29 23:06:17 +0000 |
| commit | 766a2388d46f49e07ec0280fa4f3d254367850d1 (patch) | |
| tree | f7c116f3a638a861575a16467703ad19fd26255c /os/hal/ports/AVR/hal_lld.h | |
| parent | 5eb1ae8cc3f4d2584d31e2d9672162bf8bfc0274 (diff) | |
| download | ChibiOS-766a2388d46f49e07ec0280fa4f3d254367850d1.tar.gz ChibiOS-766a2388d46f49e07ec0280fa4f3d254367850d1.tar.bz2 ChibiOS-766a2388d46f49e07ec0280fa4f3d254367850d1.zip | |
AVR HAL ported from RT-2 (serial/pal/hal tested)
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@6999 35acf78f-673a-0410-8e92-d51de3d6d3f4
Diffstat (limited to 'os/hal/ports/AVR/hal_lld.h')
| -rw-r--r-- | os/hal/ports/AVR/hal_lld.h | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/os/hal/ports/AVR/hal_lld.h b/os/hal/ports/AVR/hal_lld.h new file mode 100644 index 000000000..94daa5b6e --- /dev/null +++ b/os/hal/ports/AVR/hal_lld.h @@ -0,0 +1,117 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006-2014 Giovanni Di Sirio
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+/**
+ * @file AVR/hal_lld.h
+ * @brief AVR HAL subsystem low level driver header.
+ *
+ * @addtogroup HAL
+ * @{
+ */
+
+#ifndef _HAL_LLD_H_
+#define _HAL_LLD_H_
+
+/*===========================================================================*/
+/* Driver constants. */
+/*===========================================================================*/
+
+/**
+ * @brief Defines the support for realtime counters in the HAL.
+ */
+#define HAL_IMPLEMENTS_COUNTERS FALSE
+
+/**
+ * @brief Platform name.
+ */
+#define PLATFORM_NAME "AVR"
+
+/**
+ * @brief Timer maximum value
+ */
+#define AVR_TIMER_COUNTER_MAX 255
+
+/*===========================================================================*/
+/* Driver pre-compile time settings. */
+/*===========================================================================*/
+
+/* Work out what the timer interrupt is called on this MCU */
+#ifdef TIMER0_COMPA_vect
+ #define AVR_TIMER_VECT TIMER0_COMPA_vect
+#elif defined(TIMER_COMPA_vect)
+ #define AVR_TIMER_VECT TIMER_COMPA_vect
+#elif defined(TIMER0_COMP_vect)
+ #define AVR_TIMER_VECT TIMER0_COMP_vect
+#else
+ #error "Cannot find interrupt vector name for timer"
+#endif
+
+/*===========================================================================*/
+/* Derived constants and error checks. */
+/*===========================================================================*/
+
+/* Find the most suitable prescaler setting for the desired CH_CFG_ST_FREQUENCY */
+#if ((F_CPU / CH_CFG_ST_FREQUENCY) <= AVR_TIMER_COUNTER_MAX)
+ #define AVR_TIMER_PRESCALER 1
+ #define AVR_TIMER_PRESCALER_BITS (0 << CS02) | (0 << CS01) | (1 << CS00); /* CLK */
+#elif ((F_CPU / CH_CFG_ST_FREQUENCY / 8) <= AVR_TIMER_COUNTER_MAX)
+ #define AVR_TIMER_PRESCALER 8
+ #define AVR_TIMER_PRESCALER_BITS (0 << CS02) | (1 << CS01) | (0 << CS00); /* CLK/8 */
+#elif ((F_CPU / CH_CFG_ST_FREQUENCY / 64) <= AVR_TIMER_COUNTER_MAX)
+ #define AVR_TIMER_PRESCALER 64
+ #define AVR_TIMER_PRESCALER_BITS (0 << CS02) | (1 << CS01) | (1 << CS00); /* CLK/64 */
+#elif ((F_CPU / CH_CFG_ST_FREQUENCY / 256) <= AVR_TIMER_COUNTER_MAX)
+ #define AVR_TIMER_PRESCALER 256
+ #define AVR_TIMER_PRESCALER_BITS (1 << CS02) | (0 << CS01) | (0 << CS00); /* CLK/256 */
+#elif ((F_CPU / CH_CFG_ST_FREQUENCY / 1024) <= AVR_TIMER_COUNTER_MAX)
+ #define AVR_TIMER_PRESCALER 1024
+ #define AVR_TIMER_PRESCALER_BITS (1 << CS02) | (0 << CS01) | (1 << CS00); /* CLK/1024 */
+#else
+ #error "Frequency too low for timer, please set CH_CFG_ST_FREQUENCY to a higher value"
+#endif
+
+#define AVR_TIMER_COUNTER (F_CPU / CH_CFG_ST_FREQUENCY / AVR_TIMER_PRESCALER)
+
+/* Test if CH_CFG_ST_FREQUENCY can be matched exactly using this timer */
+#define F_CPU_ (AVR_TIMER_COUNTER * AVR_TIMER_PRESCALER * CH_CFG_ST_FREQUENCY)
+#if (F_CPU_ != F_CPU)
+ #warning "CH_CFG_ST_FREQUENCY cannot be generated exactly using timer"
+#endif
+#undef F_CPU_
+
+/*===========================================================================*/
+/* Driver data structures and types. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver macros. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* External declarations. */
+/*===========================================================================*/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+ void hal_lld_init(void);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _HAL_LLD_H_ */
+
+/** @} */
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