diff options
Diffstat (limited to 'os/io')
| -rw-r--r-- | os/io/io.dox | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/os/io/io.dox b/os/io/io.dox index fde9dcf22..9f1b06d7f 100644 --- a/os/io/io.dox +++ b/os/io/io.dox @@ -256,4 +256,58 @@ *
* @ingroup MII
*/
+
+/**
+ * @defgroup MMC_SPI MMC over SPI Driver
+ * @brief Generic MMC driver.
+ * @details This module implements a portable MMC driver that uses a SPI
+ * driver as physical layer.<br>
+ * The driver implements the following state machine:
+ * @dot
+ digraph example {
+ rankdir="LR";
+ node [shape=circle, fontname=Helvetica, fontsize=8, fixedsize="true", width="0.75", height="0.8"];
+ edge [fontname=Helvetica, fontsize=8];
+
+ any [label="Any State"];
+ stop2 [label="MMC_STOP\nLow Power"];
+ uninit [label="MMC_UNINIT", style="bold"];
+ stop [label="MMC_STOP\nLow Power"];
+ wait [label="MMC_WAIT\nWaiting Card"];
+ inserted [label="MMC_INSERTED\nCard Inserted"];
+ ready [label="MMC_READY\nCard Ready"];
+ reading [label="MMC_RUNNING\nReading"];
+ writing [label="MMC_RUNNING\nWriting"];
+
+ uninit -> stop [label="mmcObjectInit()"];
+ stop -> wait [label="mmcStart()", constraint=false];
+ wait -> inserted [label="Insertion"];
+ inserted -> ready [label="mmcConnect()"];
+ inserted -> inserted [label="mmcDisconnect()"];
+ ready -> inserted [label="mmcDisconnect()"];
+ ready -> reading [label="mmcStartSequentialRead()"];
+ reading -> reading [label="mmcSequentialRead()"];
+ reading -> ready [label="mmcStopSequentialRead()"];
+ reading -> ready [label="Error"];
+ ready -> writing [label="mmcStartSequentialWrite()"];
+ writing -> writing [label="mmcSequentialWrite()"];
+ writing -> ready [label="mmcStopSequentialWrite()"];
+ writing -> ready [label="Error"];
+
+ inserted -> wait [label="Removal"];
+ ready -> wait [label="Removal"];
+ reading -> wait [label="Removal"];
+ writing -> wait [label="Removal"];
+
+ any -> stop2 [label="mmcStop()"];
+ }
+ * @enddot
+ *
+ * The MMC drivers currently supports only cards with capacity up to 2GB
+ * and does not implement CRC checking. Hot plugging and removal are supported
+ * through kernel events.
+ *
+ * @ingroup IO
+ */
+
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