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stm32/qspi: Workaround for SR set immediately after setting AR.

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See issue #5441.  This issue is now reproducible on the Arduino Portenta
H747, QSPI flash PN MX25L12833F.
This commit is contained in:
iabdalkader 2022-04-13 12:41:28 +02:00 committed by Damien George
parent 5974ac256b
commit 32914c53ef
1 changed files with 8 additions and 0 deletions
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8
ports/stm32/qspi.c
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@ -354,6 +354,14 @@ STATIC void qspi_read_cmd_qaddr_qdata(void *self_in, uint8_t cmd, uint32_t addr,
QUADSPI->ABR = 0; // alternate byte: disable continuous read mode QUADSPI->ABR = 0; // alternate byte: disable continuous read mode
QUADSPI->AR = addr; // address to read from QUADSPI->AR = addr; // address to read from
#if defined(STM32H7)
// Workaround for SR getting set immediately after setting the address.
if (QUADSPI->SR & 0x01) {
QUADSPI->FCR |= QUADSPI_FCR_CTEF;
QUADSPI->AR = addr; // address to read from
}
#endif
// Read in the data 4 bytes at a time if dest is aligned // Read in the data 4 bytes at a time if dest is aligned
if (((uintptr_t)dest & 3) == 0) { if (((uintptr_t)dest & 3) == 0) {
while (len >= 4) { while (len >= 4) {