Reading the make menuconfig docs/notes on properties, there is reference to "Revision 1" of the ESP32 having a bug.
See for example the make menuconfig property called "CONFIG_SPIRAM_CACHE_WORKAROUND".
This spawns some questions to me that I have not previously had need to consider and am looking for community guidance.
Q1:) What is the history and timeline of ESP32 releases?
Q2:) What is the currently release version of the ESP32
Q3:) How can we tell which release of the ESP32 we are using:
- Physically by visual inspection.
- Programatically from within an ESP-IDF based application.
The answers to these questions will help me address some short term thinking such as:
"Do I need to enable these work-arounds on my board?"
[Answered] What is revision 1 of the ESP32 as it relates to PSRAM usage?
[Answered] What is revision 1 of the ESP32 as it relates to PSRAM usage?
Last edited by kolban on Sun Jun 11, 2017 1:16 pm, edited 1 time in total.
Free book on ESP32 available here: https://leanpub.com/kolban-ESP32
Re: What is revision 1 of the ESP32 as it relates to PSRAM usage?
timestamp on ESP32-D0WDQ6 chip examplekolban wrote:
Q3:) How can we tell which release of the ESP32 we are using:
- Physically by visual inspection.
122017 is devinitiv rev1
application:kolban wrote: - Programatically from within an ESP-IDF based application.
hello world example
Code: Select all
/* Print chip information */
esp_chip_info_t chip_info;
esp_chip_info(&chip_info);
printf("This is ESP32 chip with %d CPU cores, WiFi%s%s, ",
chip_info.cores,
(chip_info.features & CHIP_FEATURE_BT) ? "/BT" : "",
(chip_info.features & CHIP_FEATURE_BLE) ? "/BLE" : "");
printf("silicon revision %d, ", chip_info.revision);
printf("%dMB %s flash\n", spi_flash_get_chip_size() / (1024 * 1024),
(chip_info.features & CHIP_FEATURE_EMB_FLASH) ? "embedded" : "external");
see here
short:
Code: Select all
espefuse.py -p PORT summary
by follow to the links pointed from WiFive there are some more infos that helps too.
best wishes
rudi
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