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mtd/w25: wait for BUSY flag to clear in w25_readid and w25_unprotect. W25Q128 datasheet says that all instructions expect 'Read Status Register' and 'Erase/Program Suspend' are ignored when BUSY flag in status register is '1'. Therefore wait for busy flag to clear in w25_readid() and w25_unprotect().

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This commit is contained in:
Jussi Kivilinna 2017-06-13 07:35:49 -06:00 committed by Gregory Nutt
parent 2596b14c90
commit 7b8df1b930
1 changed files with 17 additions and 2 deletions
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19
drivers/mtd/w25.c
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@ -337,9 +337,16 @@ static inline int w25_readid(struct w25_dev_s *priv)
finfo("priv: %p\n", priv);
/* Lock the SPI bus, configure the bus, and select this FLASH part. */
/* Lock and configure the SPI bus */
w25_lock(priv->spi);
/* Wait for any preceding write or erase operation to complete. */
(void)w25_waitwritecomplete(priv);
/* Select this FLASH part. */
SPI_SELECT(priv->spi, SPIDEV_FLASH(0), true);
/* Send the "Read ID (RDID)" command and read the first three ID bytes */
@ -444,6 +451,10 @@ static void w25_unprotect(FAR struct w25_dev_s *priv)
w25_lock(priv->spi);
/* Wait for any preceding write or erase operation to complete. */
(void)w25_waitwritecomplete(priv);
/* Send "Write enable (WREN)" */
w25_wren(priv);
@ -476,7 +487,11 @@ static uint8_t w25_waitwritecomplete(struct w25_dev_s *priv)
{
uint8_t status;
/* Loop as long as the memory is busy with a write cycle */
/* Loop as long as the memory is busy with a write cycle. Device sets BUSY
* flag to a 1 state whhen previous write or erase command is still executing
* and during this time, device will ignore further instructions except for
* "Read Status Register" and "Erase/Program Suspend" instructions.
*/
do
{