issue with SSD1309 - bad CS management

[eehsx]

Thanks Markus for your files.

SSD1309 needs "U8X8_CA(c0,a0)" command that generates this sequence : CS low, DC low, send 1 byte C0, send 1 byte A0, CS high

Your design includes CS management by spi ESP IDF :
spi_device_interface_config_t dev_config;
...
dev_config.spics_io_num = u8g2_esp32_hal.bus.spi.cs;

So, I get : DC low, CS low, send 1 byte C0, CS high, CS low, send 1 byte A0, CS high. And it's not working.

So I removed CS management by spi ESP IDF driver : dev_config.spics_io_num = U8G2_ESP32_HAL_UNDEFINED;
Then I add to u8g2_esp32_spi_byte_cb function :

case U8X8_MSG_CAD_START_TRANSFER:
	if (u8g2_esp32_hal.bus.spi.cs != U8G2_ESP32_HAL_UNDEFINED) {
		gpio_set_level(u8g2_esp32_hal.bus.spi.cs, 0);
	}
	//ESP_LOGI(TAG, "U8X8_MSG_CAD_START_TRANSFER done.");
	break;

case U8X8_MSG_CAD_END_TRANSFER:
	if (u8g2_esp32_hal.bus.spi.cs != U8G2_ESP32_HAL_UNDEFINED) {
		gpio_set_level(u8g2_esp32_hal.bus.spi.cs, 1);
	}
	//ESP_LOGI(TAG, "U8X8_MSG_CAD_END_TRANSFER done.");
	break;

So now, CS is controled by u8g2 driver and it works.

I hope this can help.