Functions

Functions
cy_en_sysint_status_t	Cy_SysInt_Init (const cy_stc_sysint_t *config, cy_israddress userIsr)
	Initializes the referenced interrupt by setting the priority and the interrupt vector. More...
cy_israddress	Cy_SysInt_SetVector (IRQn_Type IRQn, cy_israddress userIsr)
	Changes the ISR vector for the interrupt. More...
cy_israddress	Cy_SysInt_GetVector (IRQn_Type IRQn)
	Gets the address of the current ISR vector for the interrupt. More...

Detailed Description

Function Documentation

Cy_SysInt_Init()

cy_en_sysint_status_t Cy_SysInt_Init	(	const cy_stc_sysint_t *	config,
		cy_israddress	userIsr
	)

Initializes the referenced interrupt by setting the priority and the interrupt vector.

Use the CMSIS core function NVIC_EnableIRQ(config.intrSrc) to enable the interrupt.

Parameters

config	Interrupt configuration structure
userIsr	Address of the ISR

Returns

Initialization status

Note

The interrupt vector will be relocated only if the vector table was moved to __RAM_VECTOR_TABLE in SRAM. Otherwise it is ignored.

Function Usage

    #define INTERRUPT_SOURCE_GPIO  ioss_interrupts_gpio_0_IRQn

    /* Scenario: Vector table is relocated to RAM in __RAM_VECTOR_TABLE[] */

    /* Prototype of ISR function for port interrupt 0 */
    void Interrupt_Handler_Port0 (void);

    cy_stc_sysint_t intrCfg =
    {
        /*.intrSrc =*/ INTERRUPT_SOURCE_GPIO, /* Interrupt source is GPIO port 0 interrupt */
        /*.intrPriority =*/ 3UL                     /* Interrupt priority is 3 */
    };

    /* Initialize the interrupt with vector at Interrupt_Handler_Port0() */
    Cy_SysInt_Init(&intrCfg, &Interrupt_Handler_Port0);

    /* Enable the interrupt */
    NVIC_EnableIRQ(intrCfg.intrSrc);

Cy_SysInt_SetVector()

cy_israddress Cy_SysInt_SetVector	(	IRQn_Type	IRQn,
		cy_israddress	userIsr
	)

Changes the ISR vector for the interrupt.

This function relies on the assumption that the vector table is relocated to __RAM_VECTOR_TABLE[RAM_VECTORS_SIZE] in SRAM. Otherwise it will return the address of the default ISR location in the flash vector table.

Parameters

IRQn	Interrupt source
userIsr	Address of the ISR to set in the interrupt vector table

Returns

Previous address of the ISR in the interrupt vector table

Function Usage

    /* Scenario: Vector table is relocated to RAM in __RAM_VECTOR_TABLE[]. The interrupt
                 was initialized with the "intrCfg" configuration struct. */

    /* Prototype of ISR function for port interrupt 0 */
    void Interrupt_Handler_Port0 (void);

    if(&Interrupt_Handler_Port0 != Cy_SysInt_GetVector(intrCfg.intrSrc))
    {
        /* Set the port0 interrupt vector to be at Interrupt_Handler_Port0() */
        (void)Cy_SysInt_SetVector(intrCfg.intrSrc, &Interrupt_Handler_Port0);
    }

Cy_SysInt_GetVector()

cy_israddress Cy_SysInt_GetVector

(

IRQn_Type

IRQn

)

Gets the address of the current ISR vector for the interrupt.

This function relies on the assumption that the vector table is relocated to __RAM_VECTOR_TABLE[RAM_VECTORS_SIZE] in SRAM. Otherwise it will return the address of the default ISR location in the flash vector table.

Parameters

IRQn	Interrupt source

Returns

Address of the ISR in the interrupt vector table

Function Usage

    /* Scenario: Vector table is relocated to RAM in __RAM_VECTOR_TABLE[]. The interrupt
                 was initialized with the "intrCfg" configuration struct. */

    /* Prototype of ISR function for port interrupt 0 */
    void Interrupt_Handler_Port0 (void);

    if(&Interrupt_Handler_Port0 != Cy_SysInt_GetVector(intrCfg.intrSrc))
    {
        /* Set the port0 interrupt vector to be at Interrupt_Handler_Port0() */
        (void)Cy_SysInt_SetVector(intrCfg.intrSrc, &Interrupt_Handler_Port0);
    }