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arch/arm/src/stm32: Add internal pull-up option for SDIO pins (also picks up an unrelated change to a README.txt file)

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Alan Carvalho de Assis 2018-05-12 14:47:00 -06:00 committed by Gregory Nutt
parent 33a1e73bab
commit df3d9dd357
3 changed files with 38 additions and 6 deletions
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15
README.txt
View file

@ -68,6 +68,10 @@ ENVIRONMENTS
the time as Cygwin, perhaps 20 minutes for the basic Ubuntu install
(vs. more than a day for the complete Cygwin install).
There have been even more recent ports of Linux environment to
Windows. I need to update this section to include some mention of
these alternatives.
- The MSYS environment. I have no experience using the MSYS environment
and that configuration will not be discussed in this README file.
See http://www.mingw.org/wiki/MSYS if you are interested in
@ -76,6 +80,17 @@ ENVIRONMENTS
is that it is closer to a native Windows environment and uses only a
minimal of add-on POSIX-land tools.
- Other POSIX environments. Check out:
UnxUtils: https://sourceforge.net/projects/unxutils/,
https://en.wikipedia.org/wiki/UnxUtils
MobaXterm: https://mobaxterm.mobatek.net/
Gow`: https://github.com/bmatzelle/gow/wiki
Disclaimer: In priniple, these should work. However, I have never
used any of these environments and cannot guarantee that there is
not some less-than-obvious issues.
NuttX can also be installed and built on a native Windows system, but with
some potential tool-related issues (see the discussion "Native Windows
Build" under "Building NuttX" below). GNUWin32 is used to provide

9
arch/arm/src/stm32/Kconfig
View file

@ -7602,6 +7602,15 @@ config STM32_SDIO_CARD
Build in additional support needed only for SDIO cards (vs. SD
memory cards)
config STM32_SDIO_PULLUP
bool "Enable internal Pull-Ups"
default n
---help---
If you are using an external SDCard module that does not have the
pull-up resistors for the SDIO interface (like the Gadgeteer SD Card
Module) then enable this option to activate the internal pull-up
resistors.
config STM32_SDIO_DMA
bool "Support DMA data transfers"
default y if STM32_DMA2

20
arch/arm/src/stm32/stm32_sdio.c
View file

@ -151,6 +151,14 @@
# undef CONFIG_SDIO_XFRDEBUG
#endif
/* Enable the SDIO pull-up resistors if needed */
#ifdef CONFIG_STM32_SDIO_PULLUP
# define SDIO_PULLUP_ENABLE GPIO_PULLUP
#else
# define SDIO_PULLUP_ENABLE 0
#endif
/* Friendly CLKCR bit re-definitions ****************************************/
#define SDIO_CLKCR_RISINGEDGE (0)
@ -3038,14 +3046,14 @@ FAR struct sdio_dev_s *sdio_initialize(int slotno)
*/
#ifndef CONFIG_SDIO_MUXBUS
stm32_configgpio(GPIO_SDIO_D0);
stm32_configgpio(GPIO_SDIO_D0 | SDIO_PULLUP_ENABLE);
#ifndef CONFIG_STM32_SDIO_WIDTH_D1_ONLY
stm32_configgpio(GPIO_SDIO_D1);
stm32_configgpio(GPIO_SDIO_D2);
stm32_configgpio(GPIO_SDIO_D3);
stm32_configgpio(GPIO_SDIO_D1 | SDIO_PULLUP_ENABLE);
stm32_configgpio(GPIO_SDIO_D2 | SDIO_PULLUP_ENABLE);
stm32_configgpio(GPIO_SDIO_D3 | SDIO_PULLUP_ENABLE);
#endif
stm32_configgpio(GPIO_SDIO_CK);
stm32_configgpio(GPIO_SDIO_CMD);
stm32_configgpio(GPIO_SDIO_CK | SDIO_PULLUP_ENABLE);
stm32_configgpio(GPIO_SDIO_CMD | SDIO_PULLUP_ENABLE);
#endif
/* Reset the card and assure that it is in the initial, unconfigured