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renesas / fsp

Flexible Software Package (FSP) for Renesas RA MCU Family
https://renesas.github.io/fsp/
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OSPI Driver Issues #283

Closed pltmcu-jci closed 8 months ago

pltmcu-jci commented 11 months ago

I'd like to highlight two issues (and potential fixes) I ran into while interfacing the RA6M5 with an octal flash memory device (ISSI IS25LX256)

  1. r_ospi_status_sub() assumes 4 dummy clock cycles when reading the device status in not in extended SPI mode which may not work for all devices. Here's what I changed: image

  2. r_ospi_direct_transfer() assumes the byte order which may be incorrect. In my specific case, I needed the DOPI byte order to be byte0, byte1, byte2, byte3. The driver assumes the order setting to be byte1, byte0, byte3, byte2. I believe that this method needs to check the SPI protocol and the byte order then set it accordingly. Here's what I did in my case: image

renesas-austin-hansen commented 10 months ago

Thank you for reporting these issues. We agree these settings should be configurable and are planning to make improvements in the upcoming FSP 5.0.0 release.