what are GPIO that are really free ?
Posted: Tue Jun 02, 2015 3:17 pmHi.
I just plan to start a project with that chip and it looks very promising.
I still have informations missing or not clear enough for me. That is about the GPIO pins that are free for me to use.
I need a SPI and three to four outputs for my project to be viable.
looking at this page: wiki/doku.php?id=esp8266_gpio_pin_allocations
I will let GPIO0 and GPIO2 free for flashing operations.
it seems that i can use 12,13,14 for SPI, (no CS needed), then it gets problematic.
From that page, i read: "The CH_PD must be High, as well as the RST line and GPIO 2 (or left floating, i.e. unconnected)"
Can all of them be left floating or must only CH_PD be pulled up, or... something else?
And by the way, what pin is CH_PD?
At the moment, it seems that i can use GPIO1, GPIO3, GPIO4,GPIO5 and GPIO15 without interfering with the normal operations. Is that right?
Thank you.
I just plan to start a project with that chip and it looks very promising.
I still have informations missing or not clear enough for me. That is about the GPIO pins that are free for me to use.
I need a SPI and three to four outputs for my project to be viable.
looking at this page: wiki/doku.php?id=esp8266_gpio_pin_allocations
I will let GPIO0 and GPIO2 free for flashing operations.
it seems that i can use 12,13,14 for SPI, (no CS needed), then it gets problematic.
From that page, i read: "The CH_PD must be High, as well as the RST line and GPIO 2 (or left floating, i.e. unconnected)"
Can all of them be left floating or must only CH_PD be pulled up, or... something else?
And by the way, what pin is CH_PD?
At the moment, it seems that i can use GPIO1, GPIO3, GPIO4,GPIO5 and GPIO15 without interfering with the normal operations. Is that right?
Thank you.