Changes between Version 91 and Version 92 of library_stdio

Timestamp:

Jul 15, 2015, 6:57:43 PM (9 years ago)

Author:

bellefin

Comment:

--

library_stdio

@@ -338 +338 @@
 Task exit if no CMA channel available
 
- === 2) void '''giet_fbf_cma_start'''( void* buf0, void* buf1, unsigned int length ) === 
-This function initializes the chained buffer DMA controller (CMA) to transfer a stream of images from two user buffers to the frame buffer. It must be used in conjunction with the giet_fbf_cma_display() function. A CMA channel should have been allocated to the calling task in the application mapping.
- * '''buf0''' is the first user buffer base address 
- * '''buf1''' is the second user buffer base address,
- * '''length''' is the buffer size (bytes).
-
- === 3) void '''giet_fbf_cma_display'''( unsigned int buffer ) ===
+ === 2) void '''giet_fbf_cma_init_buf'''( void* buf0_vbase, void* buf1_vbase, void* sts0_vaddr, void* sts1_vaddr ) ===
+This function initializes the chained buffer descriptors for the two source buffers and the frame buffer. CMA channel should have been allocated to the calling task in the application mapping.
+ * '''buf0_vbase''' is the first user buffer base address,
+ * '''buf1_vbase''' is the second user buffer base address,
+ * '''sts0_vaddr''' is the virtual address of the first buffer status,
+ * '''sts1_vaddr''' is the virtual address of the second buffer status.
+
+ === 3) void '''giet_fbf_cma_start'''( unsigned int length ) ===
+This function initializes the chained buffer DMA controller (CMA) to transfer a stream of images from two user buffers to the frame buffer. It must be used in conjunction with the giet_fbf_cma_display() function. The chained buffer descriptors should have been initialized by the previous function. ''length'' is the buffer size (bytes). 
+
+ === 4) void '''giet_fbf_cma_display'''( unsigned int buffer ) ===
 This function enables the transfer of the buffer specified by the ''buffer'' argument (0 or 1).
 
- === 4) void '''giet_fbf_cma_stop'''( ) ===
+ === 5) void '''giet_fbf_cma_stop'''( ) ===
 This function desactivates the CMA channel allocated to the calling task.
 
- === 5) void '''giet_fbf_sync_read'''( unsigned int offset, void* buffer, unsigned int length ) ===
+ === 6) void '''giet_fbf_sync_read'''( unsigned int offset, void* buffer, unsigned int length ) ===
 This blocking function use a memcopy strategy to transfer data from the frame buffer to an user buffer: ''offset'' defines the offset (in bytes) in the frame buffer, ''buffer''  is the user buffer base address, ''length''  is the number of bytes to be transfered. 
 
- === 6) void '''giet_fbf_sync_write'''( unsigned int offset, void* buffer, unsigned int length ) ===
+ === 7) void '''giet_fbf_sync_write'''( unsigned int offset, void* buffer, unsigned int length ) ===
 This blocking function use a memcopy strategy to transfer data from an user buffer to the frame buffer: ''offset'' defines the offset (in bytes) in the frame buffer, ''buffer''  is the user buffer base address, ''length''  is the number of bytes to be transfered.