fixes a race condition when reading qspi data register

2025-05-23 20:24:02 +02:00
parent b9e5f33cb6
commit 5353d7d258
1 changed files with 5 additions and 3 deletions
--- a/include/minres/devices/qspi.h
+++ b/include/minres/devices/qspi.h
@ -66,9 +66,11 @@ static inline uint8_t spi_read(volatile qspi_t *qspi) {
  qspi->DATA = SPI_CMD_READ;
  while (spi_rsp_occupied(qspi) == 0)
    ;
-  while ((qspi->DATA & 0x80000000) == 0)
-    ;
-  return qspi->DATA;
+  int32_t data;
+  do {
+      data = qspi->DATA ;
+  } while (data<0);
+  return data;
 }

 static inline void spi_select(volatile qspi_t *qspi, uint32_t slaveId) {