Diff: targets/hal/TARGET_Atmel/TARGET_SAM_CortexM0P/drivers/tc/tc_interrupt.c

Revision:

15:a81a8d6c1dfe

diff -r d797fbdad187 -r a81a8d6c1dfe targets/hal/TARGET_Atmel/TARGET_SAM_CortexM0P/drivers/tc/tc_interrupt.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_Atmel/TARGET_SAM_CortexM0P/drivers/tc/tc_interrupt.c	Wed Nov 04 16:30:11 2015 +0000
@@ -0,0 +1,195 @@
+/**
+ * \file
+ *
+ * \brief SAM TC - Timer Counter Callback Driver
+ *
+ * Copyright (C) 2013-2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ *    Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+/*
+ * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
+ */
+
+#include "tc_interrupt.h"
+
+void *_tc_instances[TC_INST_NUM];
+
+void _tc_interrupt_handler(uint8_t instance);
+
+/**
+ * \brief Registers a callback.
+ *
+ * Registers a callback function which is implemented by the user.
+ *
+ * \note The callback must be enabled by \ref tc_enable_callback,
+ * in order for the interrupt handler to call it when the conditions for the
+ * callback type is met.
+ *
+ * \param[in]     module      Pointer to TC software instance struct
+ * \param[in]     callback_func Pointer to callback function
+ * \param[in]     callback_type Callback type given by an enum
+ */
+enum status_code tc_register_callback(
+    struct tc_module *const module,
+    tc_callback_t callback_func,
+    const enum tc_callback callback_type)
+{
+    /* Sanity check arguments */
+    Assert(module);
+    Assert(callback_func);
+
+    /* Register callback function */
+    module->callback[callback_type] = callback_func;
+
+    /* Set the bit corresponding to the callback_type */
+    if (callback_type == TC_CALLBACK_CC_CHANNEL0) {
+        module->register_callback_mask |= TC_INTFLAG_MC(1);
+    } else if (callback_type == TC_CALLBACK_CC_CHANNEL1) {
+        module->register_callback_mask |= TC_INTFLAG_MC(2);
+    } else {
+        module->register_callback_mask |= (1 << callback_type);
+    }
+    return STATUS_OK;
+}
+
+/**
+ * \brief Unregisters a callback.
+ *
+ * Unregisters a callback function implemented by the user. The callback should be
+ * disabled before it is unregistered.
+ *
+ * \param[in]     module Pointer to TC software instance struct
+ * \param[in]     callback_type Callback type given by an enum
+ */
+enum status_code tc_unregister_callback(
+    struct tc_module *const module,
+    const enum tc_callback callback_type)
+{
+    /* Sanity check arguments */
+    Assert(module);
+
+    /* Unregister callback function */
+    module->callback[callback_type] = NULL;
+
+    /* Clear the bit corresponding to the callback_type */
+    if (callback_type == TC_CALLBACK_CC_CHANNEL0) {
+        module->register_callback_mask &= ~TC_INTFLAG_MC(1);
+    } else if (callback_type == TC_CALLBACK_CC_CHANNEL1) {
+        module->register_callback_mask &= ~TC_INTFLAG_MC(2);
+    } else {
+        module->register_callback_mask &= ~(1 << callback_type);
+    }
+    return STATUS_OK;
+}
+
+/**
+ * \internal ISR handler for TC
+ *
+ * Auto-generate a set of interrupt handlers for each TC in the device.
+ */
+#define _TC_INTERRUPT_HANDLER(n, m) \
+		void TC##n##_Handler(void) \
+		{ \
+			_tc_interrupt_handler(m); \
+		}
+
+#if (SAML21E) || (SAML21G)
+_TC_INTERRUPT_HANDLER(0,0)
+_TC_INTERRUPT_HANDLER(1,1)
+_TC_INTERRUPT_HANDLER(4,2)
+#else
+MRECURSION(TC_INST_NUM, _TC_INTERRUPT_HANDLER, TC_INST_MAX_ID)
+#endif
+
+
+/**
+ * \internal Interrupt Handler for TC module
+ *
+ * Handles interrupts as they occur, it will run the callback functions
+ * that are registered and enabled.
+ *
+ * \param[in]  instance  ID of the TC instance calling the interrupt
+ *                       handler.
+ */
+void _tc_interrupt_handler(
+    uint8_t instance)
+{
+    /* Temporary variable */
+    uint8_t interrupt_and_callback_status_mask;
+
+    /* Get device instance from the look-up table */
+    struct tc_module *module
+        = (struct tc_module *)_tc_instances[instance];
+
+    /* Read and mask interrupt flag register */
+    interrupt_and_callback_status_mask = module->hw->COUNT8.INTFLAG.reg &
+                                         module->register_callback_mask &
+                                         module->enable_callback_mask;
+
+    /* Check if an Overflow interrupt has occurred */
+    if (interrupt_and_callback_status_mask & TC_INTFLAG_OVF) {
+        /* Invoke registered and enabled callback function */
+        (module->callback[TC_CALLBACK_OVERFLOW])(module);
+        /* Clear interrupt flag */
+        module->hw->COUNT8.INTFLAG.reg = TC_INTFLAG_OVF;
+    }
+
+    /* Check if an Error interrupt has occurred */
+    if (interrupt_and_callback_status_mask & TC_INTFLAG_ERR) {
+        /* Invoke registered and enabled callback function */
+        (module->callback[TC_CALLBACK_ERROR])(module);
+        /* Clear interrupt flag */
+        module->hw->COUNT8.INTFLAG.reg = TC_INTFLAG_ERR;
+    }
+
+    /* Check if an Match/Capture Channel 0 interrupt has occurred */
+    if (interrupt_and_callback_status_mask & TC_INTFLAG_MC(1)) {
+        /* Invoke registered and enabled callback function */
+        (module->callback[TC_CALLBACK_CC_CHANNEL0])(module);
+        /* Clear interrupt flag */
+        module->hw->COUNT8.INTFLAG.reg = TC_INTFLAG_MC(1);
+    }
+
+    /* Check if an Match/Capture Channel 1 interrupt has occurred */
+    if (interrupt_and_callback_status_mask & TC_INTFLAG_MC(2)) {
+        /* Invoke registered and enabled callback function */
+        (module->callback[TC_CALLBACK_CC_CHANNEL1])(module);
+        /* Clear interrupt flag */
+        module->hw->COUNT8.INTFLAG.reg = TC_INTFLAG_MC(2);
+    }
+}