alexcekay
1446961c87
In sporadic cases it is possible that a SPI exchange returns stale RX data from the DCACHE. This occurs when: - DCACHE is enabled - DMA is used The impact of this can be hard to debug and vanishes when the timing even changes minimally. This is caused by the DCACHE being invalidated before the actual DMA transaction starts which violates the recommendations from AN4839 and also does not match the implementation of other drivers on the STM32H7/STM32F7. Fixed by invalidating the DCACHE right before the actual read, which matches the implementation of the STM32F7 SPI driver. Signed-off-by: alexcekay <alexander@auterion.com>
Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
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