diff options
Diffstat (limited to 'nuttx/ChangeLog')
| -rwxr-xr-x | nuttx/ChangeLog | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/nuttx/ChangeLog b/nuttx/ChangeLog index b8f8d8bb3..a3f14f0e3 100755 --- a/nuttx/ChangeLog +++ b/nuttx/ChangeLog @@ -9375,9 +9375,9 @@ * arch/arm/src/stm32/stm32_sdio.c, drivers/mmcsd/mmcsd_sdio.c and Kconfig, and include/nuttx/sdio.h: MMCSD SDIO: Add support for a new SDWAIT_WRCOMPLETE condition. The previous logic used a busy-wait loop - to pool the car d R1 start to determine when the card was ready for + to poll the card R1 status to determine when the card was ready for the next transfer. That busy-wait can be quite long -- up to hundreds - of milliseconds. And alternative is to look the the SD D0 pin which + of milliseconds. An alternative is to look the the SD D0 pin which will change state when the card is no longer busy. This change avoids the busy-wait poll by reconfiguring the SD D0 pin as a GPIO interrupt, then waiting for the card to become ready without taking up CPU |