Add initial PWM driver for AVR

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@5924 35acf78f-673a-0410-8e92-d51de3d6d3f4

3 files changed, 706 insertions, 1 deletions

diff --git a/os/hal/platforms/AVR/platform.mk b/os/hal/platforms/AVR/platform.mk
index 8cccf813c..05d90d1c1 100644
--- a/os/hal/platforms/AVR/platform.mk
+++ b/os/hal/platforms/AVR/platform.mk
@@ -5,7 +5,8 @@ PLATFORMSRC = ${CHIBIOS}/os/hal/platforms/AVR/hal_lld.c \
               ${CHIBIOS}/os/hal/platforms/AVR/adc_lld.c \

               ${CHIBIOS}/os/hal/platforms/AVR/i2c_lld.c \

               ${CHIBIOS}/os/hal/platforms/AVR/spi_lld.c \

-              ${CHIBIOS}/os/hal/platforms/AVR/gpt_lld.c

+              ${CHIBIOS}/os/hal/platforms/AVR/gpt_lld.c \

+              ${CHIBIOS}/os/hal/platforms/AVR/pwm_lld.c

 

 # Required include directories

 PLATFORMINC = ${CHIBIOS}/os/hal/platforms/AVR

diff --git a/os/hal/platforms/AVR/pwm_lld.c b/os/hal/platforms/AVR/pwm_lld.c
new file mode 100644
index 000000000..c223d622a
--- /dev/null
+++ b/os/hal/platforms/AVR/pwm_lld.c
@@ -0,0 +1,492 @@
+/*
+    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.c
+ * @brief   AVR PWM driver subsystem low level driver.
+ *
+ * @addtogroup PWM
+ * @{
+ */
+
+#include "ch.h"
+#include "hal.h"
+
+#if HAL_USE_PWM || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver local definitions.                                                 */
+/*===========================================================================*/
+
+typedef struct {
+  volatile uint8_t *tccra;
+  volatile uint8_t *tccrb;
+  volatile uint8_t *ocrah;
+  volatile uint8_t *ocral;
+  volatile uint8_t *ocrbh;
+  volatile uint8_t *ocrbl;
+  volatile uint8_t *ocrch;
+  volatile uint8_t *ocrcl;
+  volatile uint8_t *tifr;
+  volatile uint8_t *timsk;
+} timer_registers_t;
+
+timer_registers_t regs_table[]=
+{
+#if AVR_PWM_USE_PWM1 || defined(__DOXYGEN__)
+#if defined(OCR1C)
+  {&TCCR1A, &TCCR1B, &OCR1AH, &OCR1AL, &OCR1BH, &OCR1BL, &OCR1CH, &OCR1CL, &TIFR1, &TIMSK1},
+#else
+  {&TCCR1A, &TCCR1B, &OCR1AH, &OCR1AL, &OCR1BH, &OCR1BL, NULL, NULL, &TIFR1, &TIMSK1},
+#endif
+#endif
+#if AVR_PWM_USE_PWM2 || defined(__DOXYGEN__)
+  {&TCCR2A, &TCCR2B, &OCR2A, &OCR2A, &OCR2B, &OCR2B, NULL, NULL, &TIFR2, &TIMSK2},
+#endif
+#if AVR_PWM_USE_PWM3 || defined(__DOXYGEN__)
+  {&TCCR3A, &TCCR3B, &OCR3AH, &OCR3AL, &OCR3BH, &OCR3BL, &OCR3CH, &OCR3CL, &TIFR3, &TIMSK3},
+#endif
+#if AVR_PWM_USE_PWM4 || defined(__DOXYGEN__)
+  {&TCCR4A, &TCCR4B, &OCR4AH, &OCR4AL, &OCR4CH, &OCR4CL, &OCR4CH, &OCR4CL, &TIFR4, &TIMSK4},
+#endif
+#if AVR_PWM_USE_PWM5 || defined(__DOXYGEN__)
+  {&TCCR5A, &TCCR5B, &OCR5AH, &OCR5AL, &OCR5BH, &OCR5BL, &OCR5CH, &OCR5CL, &TIFR5, &TIMSK5},
+#endif
+};
+
+/*===========================================================================*/
+/* Driver exported variables.                                                */
+/*===========================================================================*/
+
+/** @brief PWM driver identifiers.*/
+#if AVR_PWM_USE_PWM1 || defined(__DOXYGEN__)
+PWMDriver PWMD1;
+#endif
+#if AVR_PWM_USE_PWM2 || defined(__DOXYGEN__)
+PWMDriver PWMD2;
+#endif
+#if AVR_PWM_USE_PWM3 || defined(__DOXYGEN__)
+PWMDriver PWMD3;
+#endif
+#if AVR_PWM_USE_PWM4 || defined(__DOXYGEN__)
+PWMDriver PWMD4;
+#endif
+#if AVR_PWM_USE_PWM5 || defined(__DOXYGEN__)
+PWMDriver PWMD5;
+#endif
+
+/*===========================================================================*/
+/* Driver local variables.                                                   */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local functions.                                                   */
+/*===========================================================================*/
+
+static void config_channel(volatile uint8_t *tccra,
+                           uint8_t com1,
+                           uint8_t com0,
+                           pwmmode_t mode)
+{
+  *tccra &= ~((1 << com1) | (1 << com0));
+  if (mode == PWM_OUTPUT_ACTIVE_HIGH)
+    *tccra |= ((1 << com1) | (0 << com0)); /* non inverting mode */
+  else if (mode == PWM_OUTPUT_ACTIVE_LOW)
+    *tccra |= (1 << com1) | (1 << com0);   /* inverting mode */
+}
+
+static uint8_t timer_index(PWMDriver *pwmp)
+{
+  uint8_t index = 0;
+#if AVR_PWM_USE_PWM1 || defined(__DOXYGEN__)
+  if (pwmp == &PWMD1) return index;
+  else index++;
+#endif
+#if AVR_PWM_USE_PWM2 || defined(__DOXYGEN__)
+  if (pwmp == &PWMD2) return index;
+  else index++;
+#endif
+#if AVR_PWM_USE_PWM3 || defined(__DOXYGEN__)
+  if (pwmp == &PWMD3) return index;
+  else index++;
+#endif
+#if AVR_PWM_USE_PWM4 || defined(__DOXYGEN__)
+  if (pwmp == &PWMD4) return index;
+  else index++;
+#endif
+#if AVR_PWM_USE_PWM5 || defined(__DOXYGEN__)
+  if (pwmp == &PWMD5) return index;
+  else index++;
+#endif
+}
+
+/*===========================================================================*/
+/* Driver interrupt handlers.                                                */
+/*===========================================================================*/
+
+/*
+ * interrupt for compare1&2 and clock overflow. pwmd1 & pwmd2
+ */
+#if AVR_PWM_USE_PWM1 || defined(__DOXYGEN__)
+CH_IRQ_HANDLER(TIMER1_OVF_vect)
+{
+  CH_IRQ_PROLOGUE();
+  PWMD1.config->callback(&PWMD1);
+  CH_IRQ_EPILOGUE();
+}
+
+CH_IRQ_HANDLER(TIMER1_COMPA_vect)
+{
+  CH_IRQ_PROLOGUE();
+  PWMD1.config->channels[0].callback(&PWMD1);
+  CH_IRQ_EPILOGUE();
+}
+
+CH_IRQ_HANDLER(TIMER1_COMPB_vect)
+{
+  CH_IRQ_PROLOGUE();
+  PWMD1.config->channels[1].callback(&PWMD1);
+  CH_IRQ_EPILOGUE();
+}
+#if PWM_CHANNELS > 2
+CH_IRQ_HANDLER(TIMER1_COMPC_vect)
+{
+  CH_IRQ_PROLOGUE();
+  PWMD1.config->channels[2].callback(&PWMD1);
+  CH_IRQ_EPILOGUE();
+}
+#endif
+#endif
+
+#if AVR_PWM_USE_PWM2 || defined(__DOXYGEN__)
+CH_IRQ_HANDLER(TIMER2_OVF_vect)
+{
+  CH_IRQ_PROLOGUE();
+  PWMD2.config->callback(&PWMD2);
+  CH_IRQ_EPILOGUE();
+}
+
+CH_IRQ_HANDLER(TIMER2_COMPA_vect)
+{
+  CH_IRQ_PROLOGUE();
+  PWMD2.config->channels[0].callback(&PWMD2);
+  CH_IRQ_EPILOGUE();
+}
+
+CH_IRQ_HANDLER(TIMER2_COMPB_vect)
+{
+  CH_IRQ_PROLOGUE();
+  PWMD2.config->channels[1].callback(&PWMD2);
+  CH_IRQ_EPILOGUE();
+}
+#endif
+
+#if AVR_PWM_USE_PWM3 || defined(__DOXYGEN__)
+CH_IRQ_HANDLER(TIMER3_OVF_vect)
+{
+  CH_IRQ_PROLOGUE();
+  PWMD3.config->callback(&PWMD3);
+  CH_IRQ_EPILOGUE();
+}
+
+CH_IRQ_HANDLER(TIMER3_COMPA_vect)
+{
+  CH_IRQ_PROLOGUE();
+  PWMD3.config->channels[0].callback(&PWMD3);
+  CH_IRQ_EPILOGUE();
+}
+
+CH_IRQ_HANDLER(TIMER3_COMPB_vect)
+{
+  CH_IRQ_PROLOGUE();
+  PWMD3.config->channels[1].callback(&PWMD3);
+  CH_IRQ_EPILOGUE();
+}
+
+CH_IRQ_HANDLER(TIMER3_COMPC_vect)
+{
+  CH_IRQ_PROLOGUE();
+  PWMD3.config->channels[2].callback(&PWMD3);
+  CH_IRQ_EPILOGUE();
+}
+#endif
+
+#if AVR_PWM_USE_PWM4 || defined(__DOXYGEN__)
+CH_IRQ_HANDLER(TIMER4_OVF_vect)
+{
+  CH_IRQ_PROLOGUE();
+  PWMD4.config->callback(&PWMD4);
+  CH_IRQ_EPILOGUE();
+}
+
+CH_IRQ_HANDLER(TIMER4_COMPA_vect)
+{
+  CH_IRQ_PROLOGUE();
+  PWMD4.config->channels[0].callback(&PWMD4);
+  CH_IRQ_EPILOGUE();
+}
+
+CH_IRQ_HANDLER(TIMER4_COMPB_vect)
+{
+  CH_IRQ_PROLOGUE();
+  PWMD4.config->channels[1].callback(&PWMD4);
+  CH_IRQ_EPILOGUE();
+}
+
+CH_IRQ_HANDLER(TIMER4_COMPC_vect)
+{
+  CH_IRQ_PROLOGUE();
+  PWMD4.config->channels[2].callback(&PWMD4);
+  CH_IRQ_EPILOGUE();
+}
+#endif
+
+#if AVR_PWM_USE_PWM5 || defined(__DOXYGEN__)
+CH_IRQ_HANDLER(TIMER5_OVF_vect)
+{
+  CH_IRQ_PROLOGUE();
+  PWMD5.config->callback(&PWMD5);
+  CH_IRQ_EPILOGUE();
+}
+
+CH_IRQ_HANDLER(TIMER5_COMPA_vect)
+{
+  CH_IRQ_PROLOGUE();
+  PWMD5.config->channels[0].callback(&PWMD5);
+  CH_IRQ_EPILOGUE();
+}
+
+CH_IRQ_HANDLER(TIMER5_COMPB_vect)
+{
+  CH_IRQ_PROLOGUE();
+  PWMD5.config->channels[1].callback(&PWMD5);
+  CH_IRQ_EPILOGUE();
+}
+
+CH_IRQ_HANDLER(TIMER5_COMPC_vect)
+{
+  CH_IRQ_PROLOGUE();
+  PWMD5.config->channels[2].callback(&PWMD5);
+  CH_IRQ_EPILOGUE();
+}
+#endif
+
+/*===========================================================================*/
+/* Driver exported functions.                                                */
+/*===========================================================================*/
+
+/**
+ * @brief   Low level PWM driver initialization.
+ *
+ * @notapi
+ */
+void pwm_lld_init(void)
+{
+#if AVR_PWM_USE_PWM1 || defined(__DOXYGEN__)
+  pwmObjectInit(&PWMD1);
+  TCCR1A = (1 << WGM11) | (1 << WGM10);
+  TCCR1B = (0 << WGM13) | (1 << WGM12);
+#endif
+
+#if AVR_PWM_USE_PWM2 || defined(__DOXYGEN__)
+  pwmObjectInit(&PWMD2);
+  TCCR2A = (1 << WGM21) | (1 << WGM20);
+  TCCR2B = (0 << WGM22);
+#endif
+
+#if AVR_PWM_USE_PWM3 || defined(__DOXYGEN__)
+  pwmObjectInit(&PWMD3);
+  TCCR3A = (1 << WGM31) | (1 << WGM30);
+  TCCR3B = (0 << WGM33) | (1 << WGM32);
+#endif
+
+#if AVR_PWM_USE_PWM4 || defined(__DOXYGEN__)
+  pwmObjectInit(&PWMD4);
+  TCCR4A = (1 << WGM41) | (1 << WGM40);
+  TCCR4B = (0 << WGM43) | (1 << WGM42);
+#endif
+
+#if AVR_PWM_USE_PWM5 || defined(__DOXYGEN__)
+  pwmObjectInit(&PWMD5);
+  TCCR5A = (1 << WGM51) | (1 << WGM50);
+  TCCR5B = (0 << WGM53) | (1 << WGM52);
+#endif
+}
+
+/**
+ * @brief   Configures and activates the PWM peripheral.
+ *
+ * @param[in] pwmp      pointer to the @p PWMDriver object
+ *
+ * @notapi
+ */
+void pwm_lld_start(PWMDriver *pwmp)
+{
+  if (pwmp->state == PWM_STOP) {
+
+#if AVR_PWM_USE_PWM2 || defined(__DOXYGEN__)
+    if (pwmp == &PWMD2) {
+      TCCR2B &= ~((1 << CS22) | (1 << CS21));
+      TCCR2B |= (1 << CS20);
+      if (pwmp->config->callback != NULL)
+        TIMSK2 |= (1 << TOIE2);
+      return;
+    }
+#endif
+
+    /* TODO: support other prescaler options */
+
+    uint8_t i = timer_index(pwmp);
+    *regs_table[i].tccrb &= ~(1 << CS11);
+    *regs_table[i].tccrb |= (1 << CS12) | (1 << CS10);
+    *regs_table[i].timsk = (1 << TOIE1);
+  }
+}
+
+/**
+ * @brief   Deactivates the PWM peripheral.
+ *
+ * @param[in] pwmp      pointer to the @p PWMDriver object
+ *
+ * @notapi
+ */
+void pwm_lld_stop(PWMDriver *pwmp)
+{
+  uint8_t i = timer_index(pwmp);
+  *regs_table[i].tccrb &= ~((1 << CS12) | (1 << CS11) | (1 << CS10));
+  *regs_table[i].timsk = 0;
+}
+
+/**
+ * @brief   Changes the period the PWM peripheral.
+ * @details This function changes the period of a PWM unit that has already
+ *          been activated using @p pwmStart().
+ * @pre     The PWM unit must have been activated using @p pwmStart().
+ * @post    The PWM unit period is changed to the new value.
+ * @note    The function has effect at the next cycle start.
+ * @note    If a period is specified that is shorter than the pulse width
+ *          programmed in one of the channels then the behavior is not
+ *          guaranteed.
+ *
+ * @param[in] pwmp      pointer to a @p PWMDriver object
+ * @param[in] period    new cycle time in ticks
+ *
+ * @notapi
+ */
+void pwm_lld_change_period(PWMDriver *pwmp, pwmcnt_t period)
+{
+}
+
+/**
+ * @brief   Enables a PWM channel.
+ * @pre     The PWM unit must have been activated using @p pwmStart().
+ * @post    The channel is active using the specified configuration.
+ * @note    Depending on the hardware implementation this function has
+ *          effect starting on the next cycle (recommended implementation)
+ *          or immediately (fallback implementation).
+ *
+ * @param[in] pwmp      pointer to a @p PWMDriver object
+ * @param[in] channel   PWM channel identifier (0...PWM_CHANNELS-1)
+ * @param[in] width     PWM pulse width as clock pulses number
+ *
+ * @notapi
+ */
+void pwm_lld_enable_channel(PWMDriver *pwmp,
+                            pwmchannel_t channel,
+                            pwmcnt_t width)
+{
+  uint16_t val = width;
+  if (val > MAX_PWM_VALUE)
+    val = MAX_PWM_VALUE;
+
+#if AVR_PWM_USE_PWM2 || defined(__DOXYGEN__)
+  if (pwmp == &PWMD2) {
+    config_channel(&TCCR2A,
+                   7 - 2*channel,
+                   6 - 2*channel,
+                   pwmp->config->channels[channel].mode);
+    TIMSK2 |= (1 << (channel + 1));
+    /* Timer 2 is 8 bit */
+    if (val > 0xFF)
+      val = 0xFF;
+    if (pwmp->config->channels[channel].callback) {
+      switch (channel) {
+      case 0: OCR2A = val; break;
+      case 1: OCR2B = val; break;
+      }
+    }
+    return;
+  }
+#endif
+
+  uint8_t i = timer_index(pwmp);
+  config_channel(regs_table[i].tccra,
+                 7 - 2*channel,
+                 6 - 2*channel,
+                 pwmp->config->channels[channel].mode);
+  volatile uint8_t *ocrh, *ocrl;
+  switch (channel) {
+  case 1:
+    ocrh = regs_table[i].ocrbh;
+    ocrl = regs_table[i].ocrbl;
+    break;
+  case 2:
+    ocrh = regs_table[i].ocrch;
+    ocrl = regs_table[i].ocrcl;
+    break;
+  default:
+    ocrh = regs_table[i].ocrah;
+    ocrl = regs_table[i].ocral;
+  }
+  *ocrh = val >> 8;
+  *ocrl = val & 0xFF;
+  *regs_table[i].tifr |= (1 << (channel + 1));
+  if (pwmp->config->channels[channel].callback)
+    *regs_table[i].timsk |= (1 << (channel + 1));
+}
+
+/**
+ * @brief   Disables a PWM channel.
+ * @pre     The PWM unit must have been activated using @p pwmStart().
+ * @post    The channel is disabled and its output line returned to the
+ *          idle state.
+ * @note    Depending on the hardware implementation this function has
+ *          effect starting on the next cycle (recommended implementation)
+ *          or immediately (fallback implementation).
+ *
+ * @param[in] pwmp      pointer to a @p PWMDriver object
+ * @param[in] channel   PWM channel identifier (0...PWM_CHANNELS-1)
+ *
+ * @notapi
+ */
+void pwm_lld_disable_channel(PWMDriver *pwmp, pwmchannel_t channel)
+{
+  uint8_t i = timer_index(pwmp);
+  config_channel(regs_table[i].tccra,
+                 7 - 2*channel,
+                 6 - 2*channel,
+                 PWM_OUTPUT_DISABLED);
+  *regs_table[i].timsk &= ~(1 << (channel + 1));
+}
+
+#endif /* HAL_USE_PWM */
+
+/** @} */
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_ */

+

+/** @} */