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/*
* SPDX-FileCopyrightText: 2015-2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#pragma once
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include "esp_err.h"
#include "esp_intr_types.h"
#ifdef __cplusplus
extern "C" {
#endif
/** @addtogroup Intr_Alloc
* @{
*/
/** @brief Interrupt allocation flags
*
* These flags can be used to specify which interrupt qualities the
* code calling esp_intr_alloc* needs.
*
*/
//Keep the LEVELx values as they are here; they match up with (1<<level)
#define ESP_INTR_FLAG_LEVEL1 (1<<1) ///< Accept a Level 1 interrupt vector (lowest priority)
#define ESP_INTR_FLAG_LEVEL2 (1<<2) ///< Accept a Level 2 interrupt vector
#define ESP_INTR_FLAG_LEVEL3 (1<<3) ///< Accept a Level 3 interrupt vector
#define ESP_INTR_FLAG_LEVEL4 (1<<4) ///< Accept a Level 4 interrupt vector
#define ESP_INTR_FLAG_LEVEL5 (1<<5) ///< Accept a Level 5 interrupt vector
#define ESP_INTR_FLAG_LEVEL6 (1<<6) ///< Accept a Level 6 interrupt vector
#define ESP_INTR_FLAG_NMI (1<<7) ///< Accept a Level 7 interrupt vector (highest priority)
#define ESP_INTR_FLAG_SHARED (1<<8) ///< Interrupt can be shared between ISRs
#define ESP_INTR_FLAG_EDGE (1<<9) ///< Edge-triggered interrupt
#define ESP_INTR_FLAG_IRAM (1<<10) ///< ISR can be called if cache is disabled
#define ESP_INTR_FLAG_INTRDISABLED (1<<11) ///< Return with this interrupt disabled
#define ESP_INTR_FLAG_LOWMED (ESP_INTR_FLAG_LEVEL1|ESP_INTR_FLAG_LEVEL2|ESP_INTR_FLAG_LEVEL3) ///< Low and medium prio interrupts. These can be handled in C.
#define ESP_INTR_FLAG_HIGH (ESP_INTR_FLAG_LEVEL4|ESP_INTR_FLAG_LEVEL5|ESP_INTR_FLAG_LEVEL6|ESP_INTR_FLAG_NMI) ///< High level interrupts. Need to be handled in assembly.
/** Mask for all level flags */
#define ESP_INTR_FLAG_LEVELMASK (ESP_INTR_FLAG_LEVEL1|ESP_INTR_FLAG_LEVEL2|ESP_INTR_FLAG_LEVEL3| \
ESP_INTR_FLAG_LEVEL4|ESP_INTR_FLAG_LEVEL5|ESP_INTR_FLAG_LEVEL6| \
ESP_INTR_FLAG_NMI)
/** @addtogroup Intr_Alloc_Pseudo_Src
* @{
*/
/**
* The esp_intr_alloc* functions can allocate an int for all ETS_*_INTR_SOURCE interrupt sources that
* are routed through the interrupt mux. Apart from these sources, each core also has some internal
* sources that do not pass through the interrupt mux. To allocate an interrupt for these sources,
* pass these pseudo-sources to the functions.
*/
#define ETS_INTERNAL_TIMER0_INTR_SOURCE -1 ///< Platform timer 0 interrupt source
#define ETS_INTERNAL_TIMER1_INTR_SOURCE -2 ///< Platform timer 1 interrupt source
#define ETS_INTERNAL_TIMER2_INTR_SOURCE -3 ///< Platform timer 2 interrupt source
#define ETS_INTERNAL_SW0_INTR_SOURCE -4 ///< Software int source 1
#define ETS_INTERNAL_SW1_INTR_SOURCE -5 ///< Software int source 2
#define ETS_INTERNAL_PROFILING_INTR_SOURCE -6 ///< Int source for profiling
#define ETS_INTERNAL_UNUSED_INTR_SOURCE -99 ///< Interrupt is not assigned to any source
/**@}*/
/** Provides SystemView with positive IRQ IDs, otherwise scheduler events are not shown properly
*/
#define ETS_INTERNAL_INTR_SOURCE_OFF (-ETS_INTERNAL_PROFILING_INTR_SOURCE)
/** Enable interrupt by interrupt number */
#define ESP_INTR_ENABLE(inum) esp_intr_enable_source(inum)
/** Disable interrupt by interrupt number */
#define ESP_INTR_DISABLE(inum) esp_intr_disable_source(inum)
/**
* @brief Mark an interrupt as a shared interrupt
*
* This will mark a certain interrupt on the specified CPU as
* an interrupt that can be used to hook shared interrupt handlers
* to.
*
* @param intno The number of the interrupt (0-31)
* @param cpu CPU on which the interrupt should be marked as shared (0 or 1)
* @param is_in_iram Shared interrupt is for handlers that reside in IRAM and
* the int can be left enabled while the flash cache is disabled.
*
* @return ESP_ERR_INVALID_ARG if cpu or intno is invalid
* ESP_OK otherwise
*/
esp_err_t esp_intr_mark_shared(int intno, int cpu, bool is_in_iram);
/**
* @brief Reserve an interrupt to be used outside of this framework
*
* This will mark a certain interrupt on the specified CPU as
* reserved, not to be allocated for any reason.
*
* @param intno The number of the interrupt (0-31)
* @param cpu CPU on which the interrupt should be marked as shared (0 or 1)
*
* @return ESP_ERR_INVALID_ARG if cpu or intno is invalid
* ESP_OK otherwise
*/
esp_err_t esp_intr_reserve(int intno, int cpu);
/**
* @brief Allocate an interrupt with the given parameters.
*
* This finds an interrupt that matches the restrictions as given in the flags
* parameter, maps the given interrupt source to it and hooks up the given
* interrupt handler (with optional argument) as well. If needed, it can return
* a handle for the interrupt as well.
*
* The interrupt will always be allocated on the core that runs this function.
*
* If ESP_INTR_FLAG_IRAM flag is used, and handler address is not in IRAM or
* RTC_FAST_MEM, then ESP_ERR_INVALID_ARG is returned.
*
* @param source The interrupt source. One of the ETS_*_INTR_SOURCE interrupt mux
* sources, as defined in soc/soc.h, or one of the internal
* ETS_INTERNAL_*_INTR_SOURCE sources as defined in this header.
* @param flags An ORred mask of the ESP_INTR_FLAG_* defines. These restrict the
* choice of interrupts that this routine can choose from. If this value
* is 0, it will default to allocating a non-shared interrupt of level
* 1, 2 or 3. If this is ESP_INTR_FLAG_SHARED, it will allocate a shared
* interrupt of level 1. Setting ESP_INTR_FLAG_INTRDISABLED will return
* from this function with the interrupt disabled.
* @param handler The interrupt handler. Must be NULL when an interrupt of level >3
* is requested, because these types of interrupts aren't C-callable.
* @param arg Optional argument for passed to the interrupt handler
* @param ret_handle Pointer to an intr_handle_t to store a handle that can later be
* used to request details or free the interrupt. Can be NULL if no handle
* is required.
*
* @return ESP_ERR_INVALID_ARG if the combination of arguments is invalid.
* ESP_ERR_NOT_FOUND No free interrupt found with the specified flags
* ESP_OK otherwise
*/
esp_err_t esp_intr_alloc(int source, int flags, intr_handler_t handler, void *arg, intr_handle_t *ret_handle);
/**
* @brief Allocate an interrupt with the given parameters.
*
*
* This essentially does the same as esp_intr_alloc, but allows specifying a register and mask
* combo. For shared interrupts, the handler is only called if a read from the specified
* register, ANDed with the mask, returns non-zero. By passing an interrupt status register
* address and a fitting mask, this can be used to accelerate interrupt handling in the case
* a shared interrupt is triggered; by checking the interrupt statuses first, the code can
* decide which ISRs can be skipped
*
* @param source The interrupt source. One of the ETS_*_INTR_SOURCE interrupt mux
* sources, as defined in soc/soc.h, or one of the internal
* ETS_INTERNAL_*_INTR_SOURCE sources as defined in this header.
* @param flags An ORred mask of the ESP_INTR_FLAG_* defines. These restrict the
* choice of interrupts that this routine can choose from. If this value
* is 0, it will default to allocating a non-shared interrupt of level
* 1, 2 or 3. If this is ESP_INTR_FLAG_SHARED, it will allocate a shared
* interrupt of level 1. Setting ESP_INTR_FLAG_INTRDISABLED will return
* from this function with the interrupt disabled.
* @param intrstatusreg The address of an interrupt status register
* @param intrstatusmask A mask. If a read of address intrstatusreg has any of the bits
* that are 1 in the mask set, the ISR will be called. If not, it will be
* skipped.
* @param handler The interrupt handler. Must be NULL when an interrupt of level >3
* is requested, because these types of interrupts aren't C-callable.
* @param arg Optional argument for passed to the interrupt handler
* @param ret_handle Pointer to an intr_handle_t to store a handle that can later be
* used to request details or free the interrupt. Can be NULL if no handle
* is required.
*
* @return ESP_ERR_INVALID_ARG if the combination of arguments is invalid.
* ESP_ERR_NOT_FOUND No free interrupt found with the specified flags
* ESP_OK otherwise
*/
esp_err_t esp_intr_alloc_intrstatus(int source, int flags, uint32_t intrstatusreg, uint32_t intrstatusmask, intr_handler_t handler, void *arg, intr_handle_t *ret_handle);
/**
* @brief Disable and free an interrupt.
*
* Use an interrupt handle to disable the interrupt and release the resources associated with it.
* If the current core is not the core that registered this interrupt, this routine will be assigned to
* the core that allocated this interrupt, blocking and waiting until the resource is successfully released.
*
* @note
* When the handler shares its source with other handlers, the interrupt status
* bits it's responsible for should be managed properly before freeing it. see
* ``esp_intr_disable`` for more details. Please do not call this function in ``esp_ipc_call_blocking``.
*
* @param handle The handle, as obtained by esp_intr_alloc or esp_intr_alloc_intrstatus
*
* @return ESP_ERR_INVALID_ARG the handle is NULL
* ESP_FAIL failed to release this handle
* ESP_OK otherwise
*/
esp_err_t esp_intr_free(intr_handle_t handle);
/**
* @brief Get CPU number an interrupt is tied to
*
* @param handle The handle, as obtained by esp_intr_alloc or esp_intr_alloc_intrstatus
*
* @return The core number where the interrupt is allocated
*/
int esp_intr_get_cpu(intr_handle_t handle);
/**
* @brief Get the allocated interrupt for a certain handle
*
* @param handle The handle, as obtained by esp_intr_alloc or esp_intr_alloc_intrstatus
*
* @return The interrupt number
*/
int esp_intr_get_intno(intr_handle_t handle);
/**
* @brief Disable the interrupt associated with the handle
*
* @note
* 1. For local interrupts (ESP_INTERNAL_* sources), this function has to be called on the
* CPU the interrupt is allocated on. Other interrupts have no such restriction.
* 2. When several handlers sharing a same interrupt source, interrupt status bits, which are
* handled in the handler to be disabled, should be masked before the disabling, or handled
* in other enabled interrupts properly. Miss of interrupt status handling will cause infinite
* interrupt calls and finally system crash.
*
* @param handle The handle, as obtained by esp_intr_alloc or esp_intr_alloc_intrstatus
*
* @return ESP_ERR_INVALID_ARG if the combination of arguments is invalid.
* ESP_OK otherwise
*/
esp_err_t esp_intr_disable(intr_handle_t handle);
/**
* @brief Enable the interrupt associated with the handle
*
* @note For local interrupts (ESP_INTERNAL_* sources), this function has to be called on the
* CPU the interrupt is allocated on. Other interrupts have no such restriction.
*
* @param handle The handle, as obtained by esp_intr_alloc or esp_intr_alloc_intrstatus
*
* @return ESP_ERR_INVALID_ARG if the combination of arguments is invalid.
* ESP_OK otherwise
*/
esp_err_t esp_intr_enable(intr_handle_t handle);
/**
* @brief Set the "in IRAM" status of the handler.
*
* @note Does not work on shared interrupts.
*
* @param handle The handle, as obtained by esp_intr_alloc or esp_intr_alloc_intrstatus
* @param is_in_iram Whether the handler associated with this handle resides in IRAM.
* Handlers residing in IRAM can be called when cache is disabled.
*
* @return ESP_ERR_INVALID_ARG if the combination of arguments is invalid.
* ESP_OK otherwise
*/
esp_err_t esp_intr_set_in_iram(intr_handle_t handle, bool is_in_iram);
/**
* @brief Disable interrupts that aren't specifically marked as running from IRAM
*/
void esp_intr_noniram_disable(void);
/**
* @brief Re-enable interrupts disabled by esp_intr_noniram_disable
*/
void esp_intr_noniram_enable(void);
/**
* @brief enable the interrupt source based on its number
* @param inum interrupt number from 0 to 31
*/
void esp_intr_enable_source(int inum);
/**
* @brief disable the interrupt source based on its number
* @param inum interrupt number from 0 to 31
*/
void esp_intr_disable_source(int inum);
/**
* @brief Get the lowest interrupt level from the flags
* @param flags The same flags that pass to `esp_intr_alloc_intrstatus` API
*/
static inline int esp_intr_flags_to_level(int flags)
{
return __builtin_ffs((flags & ESP_INTR_FLAG_LEVELMASK) >> 1);
}
/**
* @brief Get the interrupt flags from the supplied level (priority)
* @param level The interrupt priority level
*/
static inline int esp_intr_level_to_flags(int level)
{
return (level > 0) ? (1 << level) & ESP_INTR_FLAG_LEVELMASK : 0;
}
/**
* @brief Dump the status of allocated interrupts
* @param stream The stream to dump to, if NULL then stdout is used
* @return ESP_OK on success
*/
esp_err_t esp_intr_dump(FILE *stream);
/**
* @brief Check if the given pointer is in the safe ISR area.
* In other words, make sure that the pointer's content is accessible at
* any time, regardless of the cache status
*
* @param ptr Pointer to check
*
* @return true if `ptr` points to ISR area, false else
*/
bool esp_intr_ptr_in_isr_region(void* ptr);
/**@}*/
#ifdef __cplusplus
}
#endif
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