Search found 4 matches
- Thu Aug 02, 2018 5:04 pm
- Forum: ESP-IDF
- Topic: SD card interface high speed mode
- Replies: 12
- Views: 40485
Re: SD card interface high speed mode
Thanks. I was able to get good results on the raw sector reads. I believe I've narrowed down the bottleneck to whatever is calling esp_vfs_read(). Even though I have some relatively large buffers, esp_vfs_read() is being called with 128 bytes as an argument. Would you be able to assist me in trackin...
- Thu Aug 02, 2018 3:36 pm
- Forum: ESP-IDF
- Topic: SD card interface speed issues
- Replies: 7
- Views: 27106
Re: SD card interface speed issues
I have tracked what I think are the performance issues down to: esp_vfs_read() is being called to read 128 bytes at a time, even when I am calling an fread(), requesting 50KB. I can't find where that 50KB request is being broken into 128 byte chunks. I assume its somewhere in newlib or the configura...
- Wed Aug 01, 2018 10:53 pm
- Forum: General Discussion
- Topic: SD CARD DRIVER WITH SDIO
- Replies: 4
- Views: 8248
Re: SD CARD DRIVER WITH SDIO
I am also curious on how to assign SPI flash to other pins. I'm looking to use 2 SD cards, one each on _0 and _1.
- Wed Aug 01, 2018 10:29 pm
- Forum: ESP-IDF
- Topic: SD card interface high speed mode
- Replies: 12
- Views: 40485
Re: SD card interface high speed mode
I am having similar results with fread(), roughly 1MBps. Would you be able to post the code you used for that test with the raw sectors? I'm curious if I get the same results.
Adam
Adam