Documentation update

1 files changed, 51 insertions, 1 deletions

diff --git a/pcilib/memcpy.h b/pcilib/memcpy.h
index dbfae36..99317bf 100644
--- a/pcilib/memcpy.h
+++ b/pcilib/memcpy.h
@@ -9,10 +9,60 @@
 extern "C" {
 #endif
 
+/**
+ * The collection of slow memcpy functions to move the data between BAR and system memory. 
+ *
+ * The hardware may restrict access width or expose different behavior depending on the 
+ * access width. These functions access memory using the specified word width only. 
+ * 8-, 16-, 32-, and 64-bit wide access is supported.
+ *
+ * @param[out] dst 	- the destination memory region
+ * @param[in] src 	- the source memory region
+ * @param[in] access	- the size of word (a single memory access) in bytes
+ * @param[in] n 	- the number of words to copy (\p n * \p access bytes are copied).
+ * @return 		- `dst` or NULL on error
+ */
+void *pcilib_memcpy(void * dst, void const * src, uint8_t access, size_t n);
+
+/**
+ * The collection of slow memcpy functions to move the data between BAR and system memory. 
+ *
+ * The hardware may restrict access width or expose different behavior depending on the 
+ * access width. This function only perform 8-bit memory accesses.
+ *
+ * @param[out] dst 	- the destination memory region
+ * @param[in] src 	- the source memory region
+ * @param[in] len	- the number of bytes to copy
+ * @return 		- `dst` or NULL on error
+ */
 void *pcilib_memcpy8(void * dst, void const * src, size_t len);
+
+/**
+ * The collection of slow memcpy functions to move the data between BAR and system memory. 
+ *
+ * The hardware may restrict access width or expose different behavior depending on the 
+ * access width. This function only perform 32-bit memory accesses.
+ *
+ * @param[out] dst 	- the destination memory region
+ * @param[in] src 	- the source memory region
+ * @param[in] len	- the number of bytes to copy
+ * @return 		- `dst` or NULL on error
+ */
 void *pcilib_memcpy32(void * dst, void const * src, size_t len);
+
+
+/**
+ * The collection of slow memcpy functions to move the data between BAR and system memory. 
+ *
+ * The hardware may restrict access width or expose different behavior depending on the 
+ * access width. This function only perform 64-bit memory accesses.
+ *
+ * @param[out] dst 	- the destination memory region
+ * @param[in] src 	- the source memory region
+ * @param[in] len	- the number of bytes to copy
+ * @return 		- `dst` or NULL on error
+ */
 void *pcilib_memcpy64(void * dst, void const * src, size_t len);
-void *pcilib_memcpy(void * dst, void const * src, uint8_t access, size_t n);
 
 #ifdef __cplusplus
 }