ESP8266 datasheet(17/117 Pages) ESPRESSIF

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2. GPIO

•

Interrupt status register GPIO_STATUS

Bit[15:0] (readable and writable):

If the related bit is set to be 1, the IO interrupts. Bit[15:0] contains 16 GPIOs.

•

Interrupt clearing register GPIO_STATUS_W1TC

Bit[15:0] (readable and writable):

Write 1 into the related bit, the related GPIO interrupt status will be cleared.

2.2.5. GPIO16 Related APIs

Different from other IO interfaces, GPIO16(XPD_DCDC) belongs to the RTC module instead

of the general GPIO module. It can be used to wake up the chip during deep-sleep; it can

be conﬁgured to input or output mode; but it cannot trigger the IO interrupt. the APIs are

shown below.

•

gpio16_output_conf(void)

Set the GPIO16 to the output mode.

•

gpio16_output_set(uint8 value)

Output high/low level from GPIO16. Conﬁgure GPIO16 to the output mode ﬁrst.

•

gpio16_input_conf(void)

Set the GPIO16 to the input mode.

•

gpio16_input_get(void)

Read the GPIO16 input level status. Conﬁgure GPIO16 to the input mode ﬁrst.

2.3. Parameter onﬁguration

Three scenes are given as examples for parameter conﬁguration:

•

Conﬁgure the MTDI output high level, and enable the pull up.

•

Conﬁgure the MTDI to the input mode, and get its level status.

•

Conﬁgure the MTDI to falling edge triggers interrupt.

2.3.1. Parameter Conﬁguration for Scene 1

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.

For details of PERIPHS_IO_MUX_MTDI_U register, refer to

Section 2.2, Instruction on

GPIO Register.

2. Conﬁgure the MTDI output high level.

GPIO_OUTPUT_SET(GPIO_ID_PIN(12), 1);

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2017.05

ESP8266 Datasheet(PDF) 17 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

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