ESP8266 datasheet(35/117 Pages) ESPRESSIF

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4. SPI Communication User Guide

As SPI module triggers transmission interruption frequently, 5 interruption source enabled

should be closed. The corresponding codes are as follows:

regvalue=READ_PERI_REG(SPI_FLASH_SLAVE(SPI));

regvalue&=~(0x3ff);

WRITE_PERI_REG(SPI_FLASH_SLAVE(SPI),regvalue);

If HSPI is triggered, software that resets the 5 interruption source is needed, in order to

avoid the repeated interruption function. The corresponding codes are as follows:

regvalue=READ_PERI_REG(SPI_FLASH_SLAVE(HSPI));

regvalue&=~(0x1f);

WRITE_PERI_REG(SPI_FLASH_SLAVE(HSPI),regvalue);

Data receiving and transmitting data share one register, SPI_FLASH_C0. The

corresponding codes of readout register are as follows:

recv_data=(uint8)READ_PERI_REG(SPI_FLASH_C0(HSPI));

recv_data is a global variable. Processing program deﬁned by users can be inserted to

the tail of the sentence.

4.5. SPI Interface Description

4.5.1. Data Structure

4.5.1.1. Enumerated Values

SpiMode

SpiSubMode

⚠ Notice:

Interruption program is unﬁt for time-consuming processing code because long-time interruption program will

cause watchdog timer unable to realize normal reset and will also lead to unexpected restart of processor.

⚠ Notice:

The contents of this chapter are applicable only for Non-OS SDK V1.5.3 and above.

Value

Description

SpiMode_Master

Master mode

SpiMode_Slave

Slave mode

Value

Description

SpiSubMode_0

SPI_CPOL 0

SPI_CPHA 0

SpiSubMode_1

SPI_CPOL 0

SPI_CPHA 1

Espressif

! /!

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2017.05

ESP8266 Datasheet(PDF) 35 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

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