ESP-IDF-InkPlate Library Version 0.9.7

(June 21st, 2022)

Added support for idf.py development, as provided by tajnymag.

(April 27th, 2022)

Version 0.9.6:

• Added MCP presence detection. With chips shortage issues, some Inkplate devices (Inkplate-10, Inkplate-6PLUS) may have their second MCP chip missing. The mcp_ext.is_present() method can be used to check its availability. Log information messages are produced indicating if MCPs are detected as present or not.

Version 0.9.5:

• Corrected issue with PlatformIO Espressif32 version 3.3.0 (wifi_interface_t vs esp_interface_t)
• Added InkPlate-6PLUS support: Screen, Touch Screen, Front Light. INKPLATE_6PLUS must be defined to compile for this device. For the TouchScreen class, TouchPositions has been defined as an array of 2 entries to minimize the potential of bad methods parameters.
• Some code refactoring in drivers.
• I2C speed lowered to 100Khz instead of 1Mhz (Wire class). This to respect I2C hardware limitation related to the PullUp resistors in used with Inkplate devices.
• Added Inkplate::lightSleep() and Inkplate::deepSleep() methods, calling the InkplatePlatform class methods
• InkplatePlatform::light_sleep() and InkplatePlatform::deep_sleep() methods modified to get gpio number and level as parameters
• Inkplate::begin() method now allows for one parameter to enable/disable the SDCard initialization. Disabled by default.
• For the InkPlate-6PLUS, the Inkplate::begin() method takes a second paremeter: a handler function pointer to process touch_screen interrupts.
• Added RTC PCF85063 support.

(March 4, 2021)

Version 0.9.4: Added PressKeys class in support of the Buttons Extended Case as described here. To be used, at compile time, EXTENDED_CASE must be #defined. The TouchKeys class will then not be included.

(March 2, 2021)

Version 0.9.3: Change required by ESP-IDF Version 4.2 for the SD Card support. Thanks to Yuki Mizuno for the supplied patch.

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A porting effort to the ESP-IDF framework for the e-Radionica InkPlate software that can be find here.

--> Work in progress. It is usable, but testing remains to be completed. <--

Look in the examples folder for ready-made applications. This library is conform to the PlatformIO IDE extension. All examples can be compiled using PlatformIO.

Information about the modifications is located in file CHANGES.md

ESP-IDF configuration specifics for InkPlate devices

An InkPlate application requires some functionalities to be properly set up within the ESP-IDF. The following elements have been done for this project and can be used as a reference for other projects:

• PSRAM memory management: The PSRAM is an extension to the ESP32 memory that offers 4MB+4MB of additional RAM. The first 4MB is readily available to integrate into the dynamic memory allocation of the ESP-IDF SDK. To do so, some parameters located in the sdkconfig file must be set accordingly. This must be done using the menuconfig application that is part of the ESP-IDF. The following command will launch the application (the current folder must be the main folder of EPub-InkPlate):

  $ idf.py menuconfig
  

  The application will show a list of configuration aspects. To configure PSRAM:

  • Select Component Config > ESP32-Specific > Support for external, SPI-Connected RAM
  • Select SPI RAM config > Initialize SPI RAM during startup
  • Select Run memory test on SPI RAM Initialization
  • Select Enable workaround for bug in SPI RAM cache for Rev 1 ESP32s
  • Select SPI RAM access method > Make RAM allocatable using malloc() as well

  Leave the other options as they are.

• ESP32 processor speed: The processor must be run at 240MHz. The following line in platformio.ini request this speed:

  board_build.f_cpu = 240000000L
  

  You can also select the speed in the sdkconfig file:

  • Select Component config > ESP32-Specific > CPU frequency > 240 Mhz

• FAT Filesystem Support: If the application requires the usage of the micro SD card. This card must be formatted on a computer (Linux or Windows) with a FAT 32 partition. The InkPlate6Ctrl class requires this in its current configuration. The following parameters must be adjusted in sdkconfig:

  • Select Component config > FAT Filesystem support > Max Long filename length > 255
  • Select Number of simultaneously open files protected by lock function > 5
  • Select Prefer external RAM when allocating FATFS buffer

• Flash memory partitioning (optional): the file partitions.csv contains the table of partitions definition for the 4MB flash memory, required to support the largest applications size in an OTA context. The partitions OTA_0 and OTA_1 have been set to be 1.3MB in size. In the platformio.ini file, the line board_build.partitions=... is directing the use of these partitions configuration.