iMX8QM SCU/M4 RGPIO Interrupt

sbertrand — Mon, 03 Feb 2020 16:21:46 GMT

Hi,

The iMX8QM has two M4 with their down peripherals. One of which is RGPIO or Rapid GPIO ( perhaps even Fast GPIO, FGPIO).

Does the M4 GPIO block has interrupt support ?

It would appear not to be the case since the SDK for the M4 cores do not have interrupt register.

/** GPIO - Register Layout Typedef */
typedef struct {
__IO uint32_t PDOR; /**< Port Data Output Register, offset: 0x0 */
__O uint32_t PSOR; /**< Port Set Output Register, offset: 0x4 */
__O uint32_t PCOR; /**< Port Clear Output Register, offset: 0x8 */
__O uint32_t PTOR; /**< Port Toggle Output Register, offset: 0xC */
__I uint32_t PDIR; /**< Port Data Input Register, offset: 0x10 */
__IO uint32_t PDDR; /**< Port Data Direction Register, offset: 0x14 */
} GPIO_Type;

/** RGPIO - Register Layout Typedef */
typedef struct {
__IO uint32_t PDOR; /**< Port Data Output Register, offset: 0x0 */
__O uint32_t PSOR; /**< Port Set Output Register, offset: 0x4 */
__O uint32_t PCOR; /**< Port Clear Output Register, offset: 0x8 */
__O uint32_t PTOR; /**< Port Toggle Output Register, offset: 0xC */
__I uint32_t PDIR; /**< Port Data Input Register, offset: 0x10 */
__IO uint32_t PDDR; /**< Port Data Direction Register, offset: 0x14 */
} RGPIO_Type;

Furthermore, the SDK for the M4 cores does not list any RGPIO interrupt vector :

M4_0_TPM_IRQn = 19, /**< Timer PWM Module */
Reserved36_IRQn = 20, /**< Reserved */
Reserved37_IRQn = 21, /**< Reserved */
M4_0_LPIT_IRQn = 22, /**< Low-Power Periodic Interrupt Timer */
Reserved39_IRQn = 23, /**< Reserved */
Reserved40_IRQn = 24, /**< Reserved */
M4_0_LPUART_IRQn = 25, /**< Low Power UART */
Reserved42_IRQn = 26, /**< Reserved */
M4_0_LPI2C_IRQn = 27, /**< Low-Power I2C - Logical OR of master and slave interrupts */
Reserved44_IRQn = 28, /**< Reserved */

Is this correct ?

Is there any way to have GPIO interrupt in M4 firmware ? What are the constraints ?

Regards,
Stan

Re: iMX8QM SCU/M4 RGPIO Interrupt

igorpadykov — Tue, 04 Feb 2020 23:36:48 GMT

Hi Stan

RGPIO module has not interrupt capability, opposed to GPIO module

in LSIO subsystem.

Best regards
igor
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