Thanks for making such a great chip! I'm interested in using it as an SPI slave and have a few questions:
- first, is this possible? I think it is but the docs don't go into much detail
- which pins does it use? Is it the same as the SPI master pins or does it clash with the flash communication pins?
- how do I enable it in the firmware?
Any information will be gratefully received!
Thanks for your interest in our product.
1. ESP8266 can indeed work in SPI-Slave mode.
About the schematic and notes of ESP8266 working in SPI-Slave Mode, you can refer to "1-HDK-ESP8266_Module Application Design Guide(EN).pdf" for details.
2. If you only use SPI interface in the occasion of transmitting commands and the like which no high speed need, we advise you to use HSPI-Slave instead.
The clock rate that HSPI supports can be the same as standard SPI. However, HSPI may be limited by the rate of processing data for there is no link-list and DMA
The communication pins are shown as below.
3.The SPI-Mode SDK is still in developing. With regard to the SDK of HSPI-Slave, you can e-mail us to apply for it.
Thanks for your very helpful reply. So if i'm understanding correctly, I can use HSPI which will not clash with the flash memory on the SD port and which uses the same pins as SPI master (but in a different order).
I'll email about the SPI SDK now.
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