PCD8544 LCD driver example for esp8266 (Nokia 5110 & 3110 display)
The driver is a direct port of code found at arduino playground.
Good news, the interface no longer requires 5 available GPIO outputs so an ESP-01 will indeed work. (But only if the RX pin of the esp is used.)
This is how the code is hooked up by default:
| PCD8544 | ESP8266 |
|---|---|
| RST Pin 1 | GPIO4 |
| CE Pin 2 | GPIO5 |
| DC Pin 3 | GPIO12 |
| Din Pin 4 | GPIO13 |
| Clk Pin 5 | GPIO14 |
Some ESP-12 have GPIO4 & GPIO5 reversed.
The RST pin is optional, set it to a negative value and tie PCD8544 reset to ESP reset via a resistor.
The CE pin is optional, set it to a negative value and tie PCD8544 CE pin to GND via a resistor.
All of the pins are configurable, you just set the pins you want to use in the setting struct.
I don't know if it is required but i put 1KΩ resistors on each GPIO pin, and it does not seem to cause any problems.
Take a look at esp_mqtt_lcd to see another example on how the pcd8544 driver can be used as a library module (git subtree) in your own project.
The makefile is copied from esp_mqtt.
###Building and installing:
First you need to install the sdk and the easy way of doing that is to use esp_open_sdk.
You can put that anywhere you like (/opt/local/esp-open-sdk, /esptools etc etc)
Then you could create a small setenv.sh file, containing the location of your newly compiled sdk and other platform specific info;
export SDK_BASE=/opt/local/esp-open-sdk/sdk
export PATH=${SDK_BASE}/../xtensa-lx106-elf/bin:${PATH}
export ESPPORT=/dev/tty.usbserial
(or setup your IDE to do the same)
To make a clean build, flash and connect to the esp console you just do this in a shell:
source setenv.sh # This is only needed once per session
make clean && make test
You won't be needing esptool, the makefile only uses esptool.py (provided by esp_open_sdk)
I have tested this with sdk v0.9.5 and v0.9.4 (linux & mac)