ESP8266 datasheet(19/117 Pages) ESPRESSIF

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2. GPIO

2.3.3. Parameter Conﬁguration for Scene 3

typedef enum {

GPIO_PIN_INTR_DISABLE = 0,

GPIO_PIN_INTR_POSEDGE = 1,

GPIO_PIN_INTR_NEGEDGE = 2,

GPIO_PIN_INTR_ANYEGDE = 3,

GPIO_PIN_INTR_LOLEVEL = 4,

GPIO_PIN_INTR_HILEVEL = 5

} GPIO_INT_TYPE;

This structure is used to conﬁgure the GPIO interrupt trigger manner. It is declared in

gpio.h.

1. Conﬁgure the MTDI to GPIO mode.

PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTDI_U,FUNC_GPIO12);

This sentence writes 1 into bits 4-5 of PERIPHS_IO_MUX_MTDI_U register. When bits 4-5

of PERIPHS_IO_MUX_MTDI_U are set to be 1, the MTDI is conﬁgured to the GPIO mode.

2. Conﬁgure the MTDI to the input mode.

GPIO_DIS_OUTPUT(GPIO_ID_PIN(12));

3. Disable all IO interrupts.

ETS_GPIO_INTR_DISABLE();

4. Set the interrupt handler function.

ETS_GPIO_INTR_ATTACH(GPIO_INTERRUPT,NULL);

5. Conﬁgure MTDI to falling edge triggers interrupt.

gpio_pin_intr_state_set(GPIO_ID_PIN(12),GPIO_PIN_INTR_NEGEDGE);

This sentence writes 0x02 into bit[9:7] of GPIO_PIN12 register. It sets MTDI to falling edge

triggers interrupt.

6. Enable the GPIO interrupt.

! Note:

•

If MTDI is at high level, then the return value of GPIO_INPUT_GET is 1, level = 1;

•

If MTDI is at low level, then the return value of GPIO_INPUT_GET is 0, level = 0.

! Note:

If users want to disable the MTDI interrupt function, write 0x02 into bit[9:7] of GPIO_PIN12 register.

For other interrupt triggering mode conﬁguration, refer to

2.2 Instruction on GPIO Registers.

Espressif

! /!

11 104

2017.05

ESP8266 Datasheet(PDF) 19 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.