Ports setup PAL support for STM32.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@1048 35acf78f-673a-0410-8e92-d51de3d6d3f4

1 files changed, 10 insertions, 5 deletions

diff --git a/ports/ARMCM3-STM32F103/port.dox b/ports/ARMCM3-STM32F103/port.dox
index 244fdb20e..74a9c3289 100644
--- a/ports/ARMCM3-STM32F103/port.dox
+++ b/ports/ARMCM3-STM32F103/port.dox
@@ -31,17 +31,22 @@
 /**

  * @defgroup STM32F103_PAL I/O Ports Support

  * @brief I/O Ports peripherals support.

- * @details This module supports the STM32F103 GPIO controller. The STM32

- * controller is very flexible and allows to implement all the recommended

- * behaviors for the I/O port driver. It supports the following features (see

- * @ref PAL):

+ * @details This module supports the STM32F103 GPIO controller. The controller

+ * supports the following features (see @ref PAL):

  * - 16 bits wide ports.

  * - Atomic set/reset functions.

  * - Atomic set+reset function (atomic bus operations).

  * - Output latched regardless of the pad setting.

  * - Direct read of input pads regardless of the pad setting.

  * .

- * The only non atomic operation is bit toggling.

+ * <h2>Undesiderable Behavior</h2>

+ * Some GPIO features are less than optimal:

+ * - Pad/group/port toggling operations are not atomic.

+ * - Pad/group mode setup is not atomic.

+ * - Writing on pads/groups/ports programmed as input with pull-up/down

+ *   resistor can change the resistor setting because the output latch is

+ *   used for resistor selection.

+ * .

  * @ingroup STM32F103

  */