參數(shù)資料
型號(hào)： μSAP70300-B03
廠商： NEC Corp.
元件分類： 8位微控制器
英文描述： 8 Bit Single Chip Microcontrollers
中文描述： 8位單片機(jī)微控制器
文件頁(yè)數(shù)： 99/102頁(yè)
文件大?。?/td> 282K
代理商： ΜSAP70300-B03
89
CHAPTER 2 LIBRARY SPECIFICATIONS
2.10 CUSTOMIZE
This section explains how the user can create VRAM access functions without using the default values.
AP703000-B03 provides getmcu.c and putmcu.c, which are used as samples when the user creates VRAM
access functions.
2.10.1 VRAM Access Function Used During Compression
The functions required for VRAM access during compression are as follows:
Table 2-30. VRAM Access Functions Required During Compression
Function name
Supported sampling ratio
jpeg_getMCU_22
4:1:1 [H:V = 2:2]
jpeg_getMCU_41
4:1:1 [H:V = 4:1]
jpeg_getMCU_21
4:2:2
jpeg_getMCU_11
4:4:4
These functions read data from VRAM in MCU units, convert the format of the data into YCbCr format, and
store the data into the MCU buffer in a specific format. The functions corresponding to unnecessary sampling
ratios need not be created. The user may not arbitrarily specify function names. Instead, the same function
names as those listed in this table must be used.
The specifications of each function are as shown below.
Function name
jpeg_getMCU_xx (xx = 22, 41, 21, 11)
Outline
Exchanges/transfers data from VRAM to MCU buffer.
Syntax
#include “jpeg.h”
void jpeg_getMCU_22 (JPEGINFO*cInfo )
void jpeg_getMCU_41 (JPEGINFO*cInfo )
void jpeg_getMCU_21 (JPEGINFO*cInfo )
void jpeg_getMCU_11 (JPEGINFO*cInfo )
Argument
First address of JPEGINFO structure
Return value
None
Description
Exchanges or transfers the data of the VRAM coordinates, specified by cInfo members
“CurrentX” and “CurrentY,” to the MCU buffer specified by cInfomember “MCU_Buff_Bptr.”
Caution
Ensure that the contents of registers r20, r21, and r29 are not lost.
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