ESP8266 datasheet(28/117 Pages) ESPRESSIF

28 / 117 page

3. SPI Compatibility Mode User Guide

addr: starting address of the data to be written in. Input a value that equals 0x1f800 -

tx_length (the same as the byte mode), and the tx_length should equal to count.

6. int sif_spi_read_blocks(u32 addr, u8 *dst, u16 count,u16

block_size)

Function:

Write the SDIO block mode into the API; encapsulate the write-in function of the CMD53

byte mode. It can only transport the packets, According to the SDIO protocol, the

maximum data length is 512 blocks.

Location:

port_spi.c. Called by dioRW in egl_thread.c and sif_io_sync used by the

program downloader in

esp_main_sim.c.

Parameters:

src: starting address of the receiving buffer

count: length of the packet to be received (unit: block)

block_size: the number of bytes in 1 block. It should be equal to the 16 bit value whose

func = 0, and whose addr=0x110-111. In general, when initialising the SDIO,

block_size of the ESP8266 SDIO should be conﬁgured. The starting value of DEMO is

512. During the operation, it is conﬁgured to be 1024. block_size should be an integer

multiple of 4.

addr: starting address of the data to be read. Input a value that equals 0x1f800 -

tx_length (the same as the byte mode), and the tx_length should equal to count.

7. void EXTI9_5_IRQHandler(void)

Function:

The communication interrupt processing function offers enable signal for

egl_arch_sem_wait (& BusIrqReadSem,1000) in thread function SdioRW, so that

SdioRW thread can exit the wait state, and read the SDIO status register.

Location:

spi_cfg.c

Espressif

! /!

20 104

2017.05

ESP8266 Datasheet(PDF) 28 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.