git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@1239 35acf78f-673a-0410-8e92-d51de3d6d3f4

2 files changed, 10 insertions, 7 deletions

diff --git a/os/io/pal.h b/os/io/pal.h
index b75582ee1..2a1cbaf63 100644
--- a/os/io/pal.h
+++ b/os/io/pal.h
@@ -141,12 +141,12 @@
  *       not belonging to the bus.
  */

 typedef struct {

-  /** Port identifier. */

+  /** Port identifier.*/

   ioportid_t            bus_portid;

   /** Bus mask aligned to port bit 0. The bus mask implicitly define the bus

-   *  width. */

+      width. A logical AND is performed on the bus data.*/

   ioportmask_t          bus_mask;

-  /** Offset, within the port, of the least significant bit of the bus. */

+  /** Offset, within the port, of the least significant bit of the bus.*/

   uint_fast8_t          bus_offset;

 } IOBus;

 

@@ -273,7 +273,8 @@ typedef struct {
  * @brief Reads a group of bits.

  *
  * @param[in] port the port identifier

- * @param[in] mask the group mask

+ * @param[in] mask the group mask, a logical AND is performed on the input

+ *            data

  * @param[in] offset the group bit offset within the port

  * @return The group logical states.

  */

@@ -288,7 +289,8 @@ typedef struct {
  * @brief Writes a group of bits.

  *

  * @param[in] port the port identifier

- * @param[in] mask the group mask

+ * @param[in] mask the group mask, a logical AND is performed on the output

+ *            data

  * @param[in] offset the group bit offset within the port

  * @param[in] bits the bits to be written. Values exceeding the group width

  *            are masked.

diff --git a/os/io/platforms/LPC214x/pal_lld.h b/os/io/platforms/LPC214x/pal_lld.h
index 4547abc61..565b3333a 100644
--- a/os/io/platforms/LPC214x/pal_lld.h
+++ b/os/io/platforms/LPC214x/pal_lld.h
@@ -183,7 +183,8 @@ typedef FIO * ioportid_t;
  *          accesses.

  *

  * @param[in] port the port identifier

- * @param[in] mask the group mask

+ * @param[in] mask the group mask, a logical AND is performed on the output

+ *            data

  * @param[in] offset the group bit offset within the port

  * @param[in] bits the bits to be written. Values exceeding the group width

  *            are masked.

@@ -192,7 +193,7 @@ typedef FIO * ioportid_t;
  *       code.

  */

 #define pal_lld_writegroup(port, mask, offset, bits) {                  \

-  (port)->FIO_MASK = (mask) << (offset);                                \

+  (port)->FIO_MASK = ~((mask) << (offset));                             \

   (port)->FIO_PIN = (bits) << (offset);                                 \

   (port)->FIO_MASK = 0;                                                 \

 }