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| author | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2013-06-15 15:58:20 +0000 |
|---|---|---|
| committer | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2013-06-15 15:58:20 +0000 |
| commit | 7c68ef157d009f9932ac47ba21ba5d74e321623f (patch) | |
| tree | 6c2442ca44cd090656ec3059ffb959f3d747e18d /os/hal/platforms/LPC8xx/gpt_lld.h | |
| parent | 076746af63d317f8e96766b9137a65679f60463f (diff) | |
| parent | e0d850113610f3efa0c0ac4946901f683e5e7332 (diff) | |
| download | ChibiOS-7c68ef157d009f9932ac47ba21ba5d74e321623f.tar.gz ChibiOS-7c68ef157d009f9932ac47ba21ba5d74e321623f.tar.bz2 ChibiOS-7c68ef157d009f9932ac47ba21ba5d74e321623f.zip | |
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/kernel_3_dev@5854 35acf78f-673a-0410-8e92-d51de3d6d3f4
Diffstat (limited to 'os/hal/platforms/LPC8xx/gpt_lld.h')
| -rw-r--r-- | os/hal/platforms/LPC8xx/gpt_lld.h | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/os/hal/platforms/LPC8xx/gpt_lld.h b/os/hal/platforms/LPC8xx/gpt_lld.h new file mode 100644 index 000000000..73f080f66 --- /dev/null +++ b/os/hal/platforms/LPC8xx/gpt_lld.h @@ -0,0 +1,208 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006-2013 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 LPC8xx/gpt_lld.h
+ * @brief LPC8xx GPT subsystem low level driver header.
+ *
+ * @addtogroup GPT
+ * @{
+ */
+
+#ifndef _GPT_LLD_H_
+#define _GPT_LLD_H_
+
+#if HAL_USE_GPT || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver constants. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver pre-compile time settings. */
+/*===========================================================================*/
+
+/**
+ * @brief GPT1 driver enable switch.
+ * @details If set to @p TRUE the support for GPT1 is included.
+ * @note The default is @p TRUE.
+ */
+#if !defined(LPC8xx_GPT_USE_MRT0) || defined(__DOXYGEN__)
+#define LPC8xx_GPT_USE_MRT0 TRUE
+#endif
+
+/**
+ * @brief GPT2 driver enable switch.
+ * @details If set to @p TRUE the support for GPT2 is included.
+ * @note The default is @p FALSE.
+ */
+#if !defined(LPC8xx_GPT_USE_MRT1) || defined(__DOXYGEN__)
+#define LPC8xx_GPT_USE_MRT1 FALSE
+#endif
+
+/**
+ * @brief GPT3 driver enable switch.
+ * @details If set to @p TRUE the support for GPT3 is included.
+ * @note The default is @p FALSE.
+ */
+#if !defined(LPC8xx_GPT_USE_MRT2) || defined(__DOXYGEN__)
+#define LPC8xx_GPT_USE_MRT2 FALSE
+#endif
+
+/**
+ * @brief GPT4 driver enable switch.
+ * @details If set to @p TRUE the support for GPT4 is included.
+ * @note The default is @p FALSE.
+ */
+#if !defined(LPC8xx_GPT_USE_MRT3) || defined(__DOXYGEN__)
+#define LPC8xx_GPT_USE_MRT3 FALSE
+#endif
+
+/**
+ * @brief GPT interrupt priority level setting.
+ */
+#if !defined(LPC8xx_GPT_MRT_IRQ_PRIORITY) || defined(__DOXYGEN__)
+#define LPC8xx_GPT_MRT_IRQ_PRIORITY 2
+#endif
+
+
+/*===========================================================================*/
+/* Derived constants and error checks. */
+/*===========================================================================*/
+
+#if !LPC8xx_GPT_USE_MRT0 && !LPC8xx_GPT_USE_MRT1 && \
+ !LPC8xx_GPT_USE_MRT2 && !LPC8xx_GPT_USE_MRT3
+#error "GPT driver activated but no CT peripheral assigned"
+#endif
+
+/*===========================================================================*/
+/* Driver data structures and types. */
+/*===========================================================================*/
+
+/**
+ * @brief GPT frequency type.
+ */
+typedef uint32_t gptfreq_t;
+
+/**
+ * @brief GPT counter type.
+ */
+typedef uint32_t gptcnt_t;
+
+/**
+ * @brief Driver configuration structure.
+ * @note It could be empty on some architectures.
+ */
+typedef struct {
+ /**
+ * @brief Timer clock in Hz.
+ * @note The low level can use assertions in order to catch invalid
+ * frequency specifications.
+ */
+ gptfreq_t frequency;
+ /**
+ * @brief Timer callback pointer.
+ * @note This callback is invoked on GPT counter events.
+ */
+ gptcallback_t callback;
+ /* End of the mandatory fields.*/
+} GPTConfig;
+
+/**
+ * @brief Structure representing a GPT driver.
+ */
+struct GPTDriver {
+ /**
+ * @brief Driver state.
+ */
+ gptstate_t state;
+ /**
+ * @brief Current configuration data.
+ */
+ const GPTConfig *config;
+ /* End of the mandatory fields.*/
+ /**
+ * @brief Pointer to the MRT Channelx registers block.
+ */
+ MRT_Channel_cfg_Type *tmr;
+ /**
+ * @brief Prescaler.
+ */
+ uint32_t pr;
+ /**
+ * @brief channel bitmask.
+ */
+ uint32_t mask;
+};
+
+/*===========================================================================*/
+/* Driver macros. */
+/*===========================================================================*/
+
+/**
+ * @brief Changes the interval of GPT peripheral.
+ * @details This function changes the interval of a running GPT unit.
+ * @pre The GPT unit must have been activated using @p gptStart().
+ * @pre The GPT unit must have been running in continuous mode using
+ * @p gptStartContinuous().
+ * @post The GPT unit interval is changed to the new value.
+ * @note The function has effect at the next cycle start.
+ *
+ * @param[in] gptp pointer to a @p GPTDriver object
+ * @param[in] interval new cycle time in timer ticks
+ * @notapi
+ */
+#define gpt_lld_change_interval(gptp, interval) \
+ ((gptp)->tmr->INTVAL = ((interval*(gptp)->pr) - 1))
+
+/*===========================================================================*/
+/* External declarations. */
+/*===========================================================================*/
+
+#if LPC8xx_GPT_USE_MRT0 && !defined(__DOXYGEN__)
+extern GPTDriver GPTD1;
+#endif
+
+#if LPC8xx_GPT_USE_MRT1 && !defined(__DOXYGEN__)
+extern GPTDriver GPTD2;
+#endif
+
+#if LPC8xx_GPT_USE_MRT2 && !defined(__DOXYGEN__)
+extern GPTDriver GPTD3;
+#endif
+
+#if LPC8xx_GPT_USE_MRT3 && !defined(__DOXYGEN__)
+extern GPTDriver GPTD4;
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+ void gpt_lld_init(void);
+ void gpt_lld_start(GPTDriver *gptp);
+ void gpt_lld_stop(GPTDriver *gptp);
+ void gpt_lld_start_timer(GPTDriver *gptp, gptcnt_t period);
+ void gpt_lld_stop_timer(GPTDriver *gptp);
+ void gpt_lld_polled_delay(GPTDriver *gptp, gptcnt_t interval);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HAL_USE_GPT */
+
+#endif /* _GPT_LLD_H_ */
+
+/** @} */
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