I want my laptop to communicate with KL25Z via wifi and ESP8266 is the bridge. my laptop sends information to ESP-01 via wifi and then the ESP-01 sends those data to KL25Z via cable (the reverse direction will work as well, from KL25Z to ESP-01 and to laptop). The communication protocol is UART.
To implement this project, I connected my KL25Z to laptop with its own cable. ESP-01 and KL25Z are connected with jumper wires as:
KL25Z 3.3 V --> ESP-01 VCC
KL25Z 3.3 V --> ESP-01 CH_PD
KL25Z GND --> ESP-01 GND
KL25Z TX --> ESP-01 RX
KL25Z RX --> ESP-01 TX
My problem is to program these boards. It's said we can prgram ESP-01 with USB-to-serial driver or external MCU (which in my case is KL25Z). I'd appreciate your help if you answer following question:
1- Is my connections correct now?
2- How should I program ESP-01 using my KL25Z board? should I first configure the UART between laptop and KL25Z, and configure ESP-01 using that path?
3- Also, can someone explain what does RST, GPIO0 and GPIO2 do? Different websites tell different things and all of those are old. My ESP-01 is new and I want to know pulling these pins high and low will do what.
FRDM-KL25Z
