alex/esp-idf
1
0
Fork 0
mirror of https://github.com/espressif/esp-idf.git synced 2025-08-21 00:48:14 +00:00
Code Issues Packages Projects Releases Wiki Activity

esp_hw_support: decrease RNG read frequency on C6 and H2

Browse Source 
* The RNG reading frequency of 200 KHz has been too high for
  C6 and H2 since on these chips the RNG output is combined
  with the RTC slow clock which is only 150KHz. Reduced the max
  reading frequency via esp_random() from 200KHz to 62.5KHz,
  which show best results in tests.
  Also updated the bootloader_fill_random() max frequency to the
  same value to be in line, even though it was just 83KHz.
This commit is contained in:
Jakob Hasse
2023-05-30 12:15:48 +08:00
parent 94ebc9ba4e
commit d7ce04a5cd
2 changed files with 8 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
components/bootloader_support/src/bootloader_random.c
View File

@@ -25,7 +25,8 @@
#if !defined CONFIG_IDF_TARGET_ESP32S3
#if (defined CONFIG_IDF_TARGET_ESP32C6 || defined CONFIG_IDF_TARGET_ESP32H2)
#define RNG_CPU_WAIT_CYCLE_NUM (80 * 12) // higher frequency because we are reading bytes instead of words
#define RNG_CPU_WAIT_CYCLE_NUM (80 * 16) // Keep the byte sampling frequency in the ~62KHz range which has been
// tested.
#else
#define RNG_CPU_WAIT_CYCLE_NUM (80 * 32 * 2) /* extra factor of 2 is precautionary */
#endif