ESP8266 Community Forum

- Sun Jun 26, 2016 11:17 am #49807 ESP-01 module has only TX,RX,GPIO0 && GPIO2 available. But can we use SPI master to use it as AVR ISP?

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- Sun Jun 26, 2016 11:33 am #49808 Those pins can not access the Hardware SPI.
So, you would have to do it in software using bit-banging the GPIOs.
Speed can also becomes an issue.

- Sun Jun 26, 2016 12:17 pm #49811 With 4 I/Os for SPI, you won't have any I/Os left to control the AVR's reset line.
I'd recommend to either use an UART bootloader on the AVR (the esplink project already supports this configuration afaik) or to use a better ESP module than those crappy ESP-01s.

- Sun Jun 26, 2016 1:46 pm #49819

With 4 I/Os for SPI, you won't have any I/Os left to control the AVR's reset line.
I'd recommend to either use an UART bootloader on the AVR (the esplink project already supports this configuration afaik) or to use a better ESP module than those crappy ESP-01s.

Well tried esplink and dosen't work cleanly.
An reset using 4 th line. 3 lines for MOSI,MISO,SCK.

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