Fixes to write/erase failures observed on Winbond SPI flash W25Q128JV #4
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added 3 commits
November 30, 2023 21:44
This example does result in verification failures in a setup with STM32 and Winbond W25Q128JV flash.
Any write or erase command will be ignored unless this bit is set, so make sure the WEL bit is set before exiting write_enable(). The WEL bit is set in response to the Write Enable command, but prior to this change, the WEL bit status was not being checked. This would result in occasional erase failures.
This addresses two failure modes associated with the reading of the BUSY status bit: the case when the BUSY bit is not yet set on entering the function, and the case where it is briefly cleared but immediately reset by the chip. The latter is not really documented behavior but has been observed on Winbond W25Q128JV
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These changes solve several issues we observed with this driver and Winbond's SPI flash W25Q128JV.
The observed symptoms were occasional failed erase and write operations. The example code in the first commit reveals the problems and we observe many failures unless the subsequent commits are applied.