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#include "jpegdecoder.h"
static int MaskT, MaskL, MaskR, MaskB; /* Active drawing area */
/****************************************************************************************************************************
*函數名稱：JpgDecoderRead()
*參數 :
*返回值 :
*功能描述:用于JPG解碼讀取內存卡JPG文件數據，內部調用
******************************************************************************************************************************/
static UINT JpgDecoderRead(JDEC* jd, /* Decoder object */BYTE* buff, /* Pointer to the read buffer (NULL:skip) */UINT nd /* Number of bytes to read/skip from input stream */)
{
UINT rb;
FIL *fil = (FIL*)jd->device; /* Input stream of this session */
if (buff) { /* Read nd bytes from the input strem */
f_read(fil, buff, nd, &rb);
return rb; /* Returns number of bytes could be read */
} else { /* Skip nd bytes on the input stream */
return (f_lseek(fil, f_tell(fil) + nd) == FR_OK) ? nd : 0;
}
}
void SetJPGDisplayAera(uint16_t xs,uint16_t ys,uint16_t xe,uint16_t ye)
{
MaskL = xs;
MaskR = xe;
MaskT = ys;
MaskB = ye;
}
/****************************************************************************************************************************
*函數名稱：Jpg_Display()
*參數 :
*返回值 :
*功能描述:用于JPG解碼后將RGB數據顯示到TFT液晶屏，內部調用
******************************************************************************************************************************/
static UINT Jpg_Display (
JDEC* jd, /* Decoder object */
void* bitmap, /* Bitmap data to be output */
JRECT* rect /* Rectangular region to output */
)
{
int yc, xc, xl, xs;
uint16_t *pData=(uint16_t*)bitmap;
jd = jd; /* Suppress warning (device identifier is not needed) */
/*將解碼數據顯示到液晶屏區域*/
//disp_blt(rect->left, rect->right, rect->top, rect->bottom, (uint16_t*)bitmap);
if (rect->left > rect->right || rect->top > rect->bottom) return 0; /* Check varidity */
if (rect->left > MaskR || rect->right < MaskL || rect->top > MaskB || rect->bottom < MaskT) return 0; /* Check if in active area */
yc = rect->bottom - rect->top + 1; /* Vertical size */
xc = rect->right - rect->left + 1; xs = 0; /* Horizontal size and skip */
if (rect->top < MaskT) { /* Clip top of source image if it is out of active area */
pData += xc * (MaskT - rect->top);
yc -= MaskT - rect->top;
rect->top = MaskT;
}
if (rect->bottom > MaskB) { /* Clip bottom of source image if it is out of active area */
yc -= rect->bottom - MaskB;
rect->bottom = MaskB;
}
if (rect->left < MaskL) { /* Clip left of source image if it is out of active area */
pData += MaskL - rect->left;
xc -= MaskL - rect->left;
xs += MaskL - rect->left;
rect->left = MaskL;
}
if (rect->right > MaskR) { /* Clip right of source image it is out of active area */
xc -= rect->right - MaskR;
xs += rect->right - MaskR;
rect->right = MaskR;
}
/*設置水平方向X開始坐標*/
// LCD_WriteReg(0x50, rect->left);
// /*設置水平方向X結束坐標*/
// LCD_WriteReg(0x51, rect->right);
// /*設置豎直方向Y開始坐標*/
// LCD_WriteReg(0x52, rect->top);
// /*設置豎直方向Y結束坐標*/
// LCD_WriteReg(0x53, rect->bottom);
LCD_SetCursor(rect->left, rect->top);
LCD_WriteRAM_Start();
do { /* Send image data */
xl = xc;
do {
//pd = *pat++;
LCD_WriteRAM(*pData++); //顯示像素
} while (--xl);
pData += xs;
} while (--yc);
return 1; /* Continue decompression */
}
/****************************************************************************************************************************
*函數名稱：Load_Jpg()
*參數 :
*返回值 :
*功能描述:用于JPG解碼并顯示到TFT液晶屏，外部調用即可進行解碼顯示
******************************************************************************************************************************/
void Load_Jpg (
FIL *fp, /* Pointer to the open file object to load */
void *work, /* Pointer to the working buffer (must be 4-byte aligned) */
UINT sz_work /* Size of the working buffer (must be power of 2) */
)
{
JDEC jd; /* Decoder object (124 bytes) */
JRESULT rc;
BYTE scale;
/*載入需要解碼的JPG數據 */
rc = jd_prepare(&jd, JpgDecoderRead, work, sz_work, fp);
if (rc == JDR_OK)
{
/*判斷JPG的縮放，以適應屏幕大小*/
for (scale = 0; scale < 3; scale++)
{
if ((jd.width >> scale) <= LCD_XMAX && (jd.height >> scale) <= LCD_YMAX) break;
}
/* 開始解碼JPG文件并顯示到液晶屏 */
rc = jd_decomp(&jd, Jpg_Display, scale); /* Start to decompress */
} else {
LCD_SetColors(RED,WHITE);
LCD_DrawString(30,140,"prepare ERR");
}
}

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/* ------------------------------------------包含的頭文件-----------------------------------------------*/
#include "stm32f4xx.h"
#include "delay.h"
#include "led.h"
#include "usart.h"
#include "lcd.h"
#include "adc.h"
extern unsigned char JPGBUFF[];
/*************************************************************************************
* 函數名稱：main()
* 參數：void
* 返回值：void
* 描述：程序主入口main函數
*************************************************************************************/
int main(void)
{
SystemInit(); //初始化系統時鐘，設置時鐘為168Mhz
LED_GPIO_Config(); //初始化LED的GPIO配置
SysTick_Init(); //系統節拍初始化
USART1_Conf(); //串口1初始化
LCD_Init(); //LCD初始化
printf("\r\n歡迎使用SY-STM32F407 V2開發板！\r\n");
printf("\r\n 山巖科技！\r\n");
printf("\r\n -----專業，值得信賴！\r\n");
delay_nms(50); //延時
printf("\r\n 這是一個JPG解碼例程 \r\n");
LoadJpegFile(JPGBUFF);
while(1)
{
LED1(On);
delay_nms(300);
LED1(Off);
delay_nms(300);
}
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t* file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif

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