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The io 15 is SS if esp8266 is slave. If esp8266 is SPI master, you can choose any free pin as CS of the slave.

 

The esp8266 arduino boards package SPISlave library examples have a solution for master if esp8266 is slave.

The state of the boot pins is required only at boot. You should wire boot pins over a 10 kOhm resistor to create a pull-up/pull-down which can be override by pin output state to use the pins for devices which are OK with or need pull-up or pull-down, for example momentary switches (buttons).

The io 15 is SS if esp8266 is slave. If esp8266 is SPI master, you can choose any free pin as CS of the slave.

The esp8266 arduino boards package SPISlave library examples have a solution for master if esp8266 is slave.

The state of the boot pins is required only at boot. You should wire boot pins over a 10 kOhm resistor to create a pull-up/pull-down which can be override by pin output state to use the pins for devices which are OK with or need pull-up or pull-down, for example momentary switches (buttons).

The io 15 is SS if esp8266 is slave. If esp8266 is SPI master, you can choose any free pin as CS of the slave.

 

The esp8266 arduino boards package SPISlave library examples have a solution for master if esp8266 is slave.

The state of the boot pins is required only at boot. You should wire boot pins over a 10 kOhm resistor to create a pull-up/pull-down which can be override by pin output state to use the pins for devices which are OK with or need pull-up or pull-down, for example momentary switches (buttons).

2 added 179 characters in body
source | link

The io 15 is SS if esp8266 is slave. If esp8266 is SPI master, you can choose any free pin as CS of the slave.

The esp8266 arduino boards package SPISlave library examples have a solution for master if esp8266 is slave.

The state of the boot pins is required only at boot. You should wire boot pins over a 10 kOhm resistor to create a pull-up/pull-down which can be override by pin output state to use the pins for devices which are OK with or need pull-up or pull-down, for example momentary switches (buttons).

The io 15 is SS if esp8266 is slave. If esp8266 is SPI master, you can choose any free pin as CS of the slave.

The esp8266 arduino boards package SPISlave library examples have a solution for master if esp8266 is slave.

The io 15 is SS if esp8266 is slave. If esp8266 is SPI master, you can choose any free pin as CS of the slave.

The esp8266 arduino boards package SPISlave library examples have a solution for master if esp8266 is slave.

The state of the boot pins is required only at boot. You should wire boot pins over a 10 kOhm resistor to create a pull-up/pull-down which can be override by pin output state to use the pins for devices which are OK with or need pull-up or pull-down, for example momentary switches (buttons).

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source | link

The io 15 is SS if esp8266 is slave. If esp8266 is SPI master, you can choose any free pin as CS of the slave.

The esp8266 arduino boards package SPISlave library examples have a solution for master if esp8266 is slave.