ESP8266 datasheet(18/117 Pages) ESPRESSIF

18 / 117 page

2. GPIO

This sentence has two functions:

•

Write 1 into bit 12 of GPIO_ENABLE_W1TS register. It enables the MTDI output

function.

•

Write 1 into bit 12 of GPIO_OUT_W1TS register. It sets MTDI output to high level.

GPIO_OUTPUT_SET(GPIO_ID_PIN(12), 0);

This sentence has two functions:

• Write 1 into bit 12 of GPIO_ENABLE_W1TS register. It enables the MTDI output

function.

• Write 1 into bit 12 of GPIO_OUT_W1TC register. It sets MTDI output to low level.

3. Enable the MTDI pull up.

PIN_PULLUP_EN(PERIPHS_IO_MUX_MTDI_U);

It writes 1 into bit 7 of PERIPHS_IO_MUX_MTDI_U. It enables the MTDI pull up.

PIN_PULLUP_DIS(PERIPHS_IO_MUX_MTDI_U);

2.3.2. Parameter Conﬁguration for Scene 2

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. Get the MTDI pin level status.

Uint8 level=0;

level=GPIO_INPUT_GET(GPIO_ID_PIN(12))

GPIO_INPUT_GET(GPIO_ID_PIN(12)) gets the status of bit 12 of GPIO_IN register. The

value of this register shows the input level of related pin. (Enable the input function of the

related pin ﬁrst to get effective register status)

! Note:

To set MTDI output to low level, set the second parameter of this function to be 0.

! Note:

To disable the MTDI pull up, use the following sentence:

Espressif

! /!

10 104

2017.05

ESP8266 Datasheet(PDF) 18 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.