Compiling cale-idf in target esp32c3

[martinberlin]

Implementation branch: 39-c3

We need to exclude epd_driver from build since it's ESP32's only:
idf.py set-target esp32c3

#include "xtensa/core-macros.h"
          ^~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
[954/1012] Building C object esp-idf/epd_driver/CMakeFiles/__idf_epd_driver.dir/font.c.obj
../components/epd_driver/font.c: In function 'uncompress':
../components/epd_driver/font.c:103:68: warning: passing argument 3 of 'tinfl_decompress' from incompatible pointer type [-Wincompatible-pointer-types]
     tinfl_status decomp_status = tinfl_decompress(&decomp, source, &source_size, dest, dest, &uncompressed_size, TINFL_FLAG_PARSE_ZLIB_HEADER | TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF);

It seems EPDiy is using some includes that are not meant to work in C3. But of course using parallel is excluded from testing this since it does not even has enough PINs for something like this.

Building this with target esp32c3 gives issues with SPI:```

../components/CalEPD/models/plasticlogic/epdspi2cs.cpp:66:28: error: 'EPD_HOST' was not declared in this scope
ret=spi_bus_initialize(EPD_HOST, &buscfg, DMA_CHAN);
^~~~~~~~
../components/CalEPD/models/plasticlogic/epdspi2cs.cpp:66:28: note: suggested alternative: 'SPI_HOST'
ret=spi_bus_initialize(EPD_HOST, &buscfg, DMA_CHAN);
^~~~~~~~
SPI_HOST
../components/CalEPD/models/plasticlogic/epdspi2cs.cpp:66:47: error: 'DMA_CHAN' was not declared in this scope
ret=spi_bus_initialize(EPD_HOST, &buscfg, DMA_CHAN);
^~~~~~~~
../components/CalEPD/models/plasticlogic/epdspi2cs.cpp:66:47: note: suggested alternative: 'DMA_ATTR'
ret=spi_bus_initialize(EPD_HOST, &buscfg, DMA_CHAN);
^~~~~~~~
DMA_ATTR

[martinberlin]

Next blocker:
display.update() called
E (818) spi_master: check_trans_valid(694): txdata transfer > host maximum
assertion "ret==ESP_OK" failed: file "../components/CalEPD/epdspi.cpp", line 158, function: virtual void EpdSpi::data(const uint8_t*, int)

Is transferring too much for the C3.
SPI Blocker post in esp32.com

Using display.spi_optimized = false; will not sent all X lines together.

Status: I still could not see the epaper refresh. Todo: hook analyzer with SPI and check what comes out

[martinberlin]

Build and working. SPI speed does not seem to be lower. Pending to review consumption from C3 vs ESP32
Implementation and test branch: 39-c3

Not sure when this is going to be merged in master since initially was though as an experimental test. The good thing is that works correctly. Working pins are in this file:
https://github.com/martinberlin/cale-idf/blob/39-c3/config-examples/C3-riscv-spi
Just copy it to sdkconfig. GPIOS:

CONFIG_EINK_SPI_MOSI=9
CONFIG_EINK_SPI_CLK=6
CONFIG_EINK_SPI_CS=19
CONFIG_EINK_DC=18
CONFIG_EINK_RST=10
CONFIG_EINK_BUSY=7

[martinberlin]

Merged on 3bee8a9..61a9f4c refactor/oop branch