linux下从spi中读取一张logo图片并显示

思路：将图片分size/256bytes次读出来，读写函数是底层spi驱动提供的接口

UINT8* spi_read_shutdownlogo(void)
{
int spi_fd;
char spi_addr[4];
int freq = 12000000;
UINT32 addr;
UINT32 i;
UINT8* rdbuffer1=NULL;
UINT32 loop_num;

spi_fd = open("/dev/spi",O_RDWR);
if(spi_fd<0){       
    printf("Can't open [/dev/spi0]\n");     
    return 0;   
}
ioctl(spi_fd, SPI_IOCTL_SET_CHANNEL, 0);    //Set SPI CS0       
ioctl(spi_fd, SPI_IOCTL_SET_FREQ, freq);        
ioctl(spi_fd, SPI_IOCTL_SET_DMA, 0);    
printf("============ENABLE==SPI============\n");

rdbuffer1=gpChunkMemAlloc(1020*1024);

if (!rdbuffer1)
{
    printf("Cannot malloc memory buffer.\n");
    close(spi_fd);
    goto exit;
}

addr=spi_header_check(); 
loop_num=1020*4;

for(i=0;i

if 0

strcat(file_path, "POWER_OFF_LOGO.JPG");
printf("open file %s\n",file_path);
fb1.pData = fb;
fb1.validRect.x = 0;
fb1.validRect.y = 0;
fb1.validRect.width = resolution.width;
fb1.validRect.height=resolution.height;
Gdjpegdecode(file_path, &fb1, resolution.width,resolution.height,&resolution, 0);
dispFlip(hDisp);
if(dv_set.display_mode == SP_DISP_OUTPUT_LCD)
{
    LCD_Backlight_Set(1);
}   

else

rdbuffer=gpChunkMemAlloc(1020*1024);
if(rdbuffer<0)
{
 printf("malloc error!!!!\n");

return 0;
}   
rdbuffer=spi_read_shutdownlogo();

/* for (int y = 0; y

endif

Play_Key_sound(SOUND_POWER_OFF);
ap_state_config_store();

if ENABLE_AUTO_REBOOT

Gsensor_Set_Int_Level(1); //

endif

sleep(1);
LCD_Backlight_Set(0);
sleep(1);
while(1)
{
    if(dv_set.power_off == 1)
    {
        printf("wait sound end or pic show  \n");
//      if(setting_config_get(SET_GSENSOR1)!=0)
        {
            Gsensor_parking_mode(setting_config_get(SET_GSENSOR1));
            Gsensor_parking_mode_int_read();
        }
        break;
    }
    usleep(10000);
}
//if(dv_set.usb_detect != 1)
kill(getppid(), SIGUSR1);
Power_Off_Set(); 
LED_Set(NORMAL_LED,0);
Enable_Sensor_Power(0);
//USB plug in
LCD_Backlight_Set(0);
LED_Set(IR_LED,0);
LED_Set(MUTE_ON,0); 
dispDestroy(hDisp);
PLL_ctl_en(pllhd, 1, 0);
dv_set.power_off = 2;
while(1)
{

    Power_Off_Set(); 
    printf("have power off, release power key!\n");
    if(power_off == 3||power_off == 0)
    {
        printf("sleep 2s!\n");
        sleep(2);
        printf("~~~~~~~start watchdog\n");
        printf("power on!\n");          
        fd = open("/dev/watchdog",0);
        if(fd<0) {
            printf("car recoder open watchdog fail!\n");
        }
        ioctl(fd,WDIOC_SETTIMEROUT,0);  //set timeout 0s        
        ioctl(fd,WDIOC_CTRL,1);     //enable watchdog   
        close(fd);
        kill(getppid(), SIGUSR1);
    }
    usleep(100);
}

}