diff options
Diffstat (limited to 'os/hal/platforms/AVR/pwm_lld.h')
| -rw-r--r-- | os/hal/platforms/AVR/pwm_lld.h | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/os/hal/platforms/AVR/pwm_lld.h b/os/hal/platforms/AVR/pwm_lld.h new file mode 100644 index 000000000..efe60e29d --- /dev/null +++ b/os/hal/platforms/AVR/pwm_lld.h @@ -0,0 +1,212 @@ +/*
+ 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.
+*/
+
+/*
+ This driver is based on the work done by Matteo Serva available at
+ http://github.com/matteoserva/ChibiOS-AVR
+*/
+
+/**
+ * @file AVR/pwm_lld.h
+ * @brief AVR PWM driver subsystem low level driver.
+ *
+ * @addtogroup PWM
+ * @{
+ */
+
+#ifndef _PWM_LLD_H_
+#define _PWM_LLD_H_
+
+#if HAL_USE_PWM || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver constants. */
+/*===========================================================================*/
+
+#if !defined(AVR_PWM_USE_PWM1)
+#define AVR_PWM_USE_PWM1 FALSE
+#endif
+#if !defined(AVR_PWM_USE_PWM2)
+#define AVR_PWM_USE_PWM2 FALSE
+#endif
+#if !defined(AVR_PWM_USE_PWM3)
+#define AVR_PWM_USE_PWM3 FALSE
+#endif
+#if !defined(AVR_PWM_USE_PWM4)
+#define AVR_PWM_USE_PWM4 FALSE
+#endif
+#if !defined(AVR_PWM_USE_PWM5)
+#define AVR_PWM_USE_PWM5 FALSE
+#endif
+
+/*===========================================================================*/
+/* Driver pre-compile time settings. */
+/*===========================================================================*/
+
+/**
+ * @brief Number of PWM channels per PWM driver.
+ */
+#if !defined(PWM_CHANNELS) || defined(__DOXYGEN__)
+ #if defined(TIMER1_COMPC_vect)
+ #define PWM_CHANNELS 3
+ #else
+ #define PWM_CHANNELS 2
+ #endif
+#endif
+
+#define MAX_PWM_VALUE 0x3FF
+
+/*===========================================================================*/
+/* Derived constants and error checks. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver data structures and types. */
+/*===========================================================================*/
+
+/**
+ * @brief PWM mode type.
+ */
+typedef uint8_t pwmmode_t;
+
+/**
+ * @brief PWM channel type.
+ */
+typedef uint8_t pwmchannel_t;
+
+/**
+ * @brief PWM counter type.
+ */
+typedef uint16_t pwmcnt_t;
+
+/**
+ * @brief PWM driver channel configuration structure.
+ * @note Some architectures may not be able to support the channel mode
+ * or the callback, in this case the fields are ignored.
+ */
+typedef struct {
+ /**
+ * @brief Channel active logic level.
+ */
+ pwmmode_t mode;
+ /**
+ * @brief Channel callback pointer.
+ * @note This callback is invoked on the channel compare event. If set to
+ * @p NULL then the callback is disabled.
+ */
+ pwmcallback_t callback;
+ /* End of the mandatory fields.*/
+} PWMChannelConfig;
+
+/**
+ * @brief Driver configuration structure.
+ * @note Implementations may extend this structure to contain more,
+ * architecture dependent, fields.
+ */
+typedef struct {
+ /**
+ * @brief Timer clock in Hz.
+ * @note The low level can use assertions in order to catch invalid
+ * frequency specifications.
+ */
+ uint16_t frequency;
+ /**
+ * @brief PWM period in ticks.
+ * @note The low level can use assertions in order to catch invalid
+ * period specifications.
+ */
+ pwmcnt_t period;
+ /**
+ * @brief Periodic callback pointer.
+ * @note This callback is invoked on PWM counter reset. If set to
+ * @p NULL then the callback is disabled.
+ */
+ pwmcallback_t callback;
+ /**
+ * @brief Channels configurations.
+ */
+ PWMChannelConfig channels[PWM_CHANNELS];
+ /* End of the mandatory fields.*/
+} PWMConfig;
+
+/**
+ * @brief Structure representing an PWM driver.
+ * @note Implementations may extend this structure to contain more,
+ * architecture dependent, fields.
+ */
+struct PWMDriver {
+ /**
+ * @brief Driver state.
+ */
+ pwmstate_t state;
+ /**
+ * @brief Current configuration data.
+ */
+ const PWMConfig *config;
+ /**
+ * @brief Current PWM period in ticks.
+ */
+ pwmcnt_t period;
+#if defined(PWM_DRIVER_EXT_FIELDS)
+ PWM_DRIVER_EXT_FIELDS
+#endif
+ /* End of the mandatory fields.*/
+};
+
+/*===========================================================================*/
+/* Driver macros. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* External declarations. */
+/*===========================================================================*/
+
+#if AVR_PWM_USE_PWM1 || defined(__DOXYGEN__)
+extern PWMDriver PWMD1;
+#endif
+#if AVR_PWM_USE_PWM2 || defined(__DOXYGEN__)
+extern PWMDriver PWMD2;
+#endif
+#if AVR_PWM_USE_PWM3 || defined(__DOXYGEN__)
+extern PWMDriver PWMD3;
+#endif
+#if AVR_PWM_USE_PWM4 || defined(__DOXYGEN__)
+extern PWMDriver PWMD4;
+#endif
+#if AVR_PWM_USE_PWM5 || defined(__DOXYGEN__)
+extern PWMDriver PWMD5;
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+ void pwm_lld_init(void);
+ void pwm_lld_start(PWMDriver *pwmp);
+ void pwm_lld_stop(PWMDriver *pwmp);
+ void pwm_lld_change_period(PWMDriver *pwmp, pwmcnt_t period);
+ void pwm_lld_enable_channel(PWMDriver *pwmp,
+ pwmchannel_t channel,
+ pwmcnt_t width);
+ void pwm_lld_disable_channel(PWMDriver *pwmp, pwmchannel_t channel);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HAL_USE_PWM */
+
+#endif /* _PWM_LLD_H_ */
+
+/** @} */
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