DM365 LCD分辨率咨询

216MHz主频的365就支持不到了，因为其pixel clk最高是到27MHz的，不够。

其他器件都嫩到74.25MHz的。   驱动方面大致也就是围绕时钟的配置来做的

主频是300MHZ，只需要改时钟吗？我修改了vencrate_sd，也没用，还是白屏？请问具体要怎么修改？

除了时钟，至少还要改行场同步

改动如下

static struct logicpd_encoder_config logicpd_encoder_configuration = {

.no_of_outputs = LOGICPD_ENCODER_MAX_NO_OUTPUTS,

.output[0] = {

     .output_name = VID_ENC_OUTPUT_LCD,

     .no_of_standard = LOGICPD_ENCODER_GRAPHICS_NUM_STD,

     .standards[0] = {

      .name = VID_ENC_STD_800x480,//VID_ENC_STD_640x480,

      .std = 1,

      .if_type = VID_ENC_IF_PRGB,

      .interlaced = 0,

      .xres = 1366, //800,//640,

      .yres = 768, //480,

      .fps ={60, 1},// {60, 1},

      .left_margin = 85,

      .right_margin = 70,

      .upper_margin = 32,

      .lower_margin = 11,

      .hsync_len = 9,

      .vsync_len = 9,

      .flags = 0}, /* hsync -ve, vsync -ve */

发现程序运行起来后，KERNEL报空间不足：

[    0.280000] Console: switching to colour frame buffer device 170x48

[    0.350000] davincifb davincifb.0: dm_osd0_fb: 1366x768x16@0,0 with framebuffer size 6192KB

[    0.410000] davincifb davincifb.0: dm_vid0_fb: 0x0x16@0,0 with framebuffer size 9288KB

[    0.460000] davincifb davincifb.0: dm_osd1_fb: 1366x768x4@0,0 with framebuffer size 6192KB

[    0.520000] davincifb davincifb.0: dm_vid1_fb: 0x0x16@0,0 with framebuffer size 9288KB

[    0.560000] DAVINCI-WDT: DaVinci Watchdog Timer: heartbeat 60 sec

[    0.570000] == dm365_pwm_init:e800000

[    0.570000] MUX: initialized PWM1_G25

[    0.570000] Serial: 8250/16550 driver $Revision: 1.90 $ 2 ports, IRQ sharing disabled

[    0.570000] serial8250.0: ttyS0 at MMIO map 0x1c20000 mem 0xfbc20000 (irq = 40) is a 16550A

[    0.570000] === serial_dl_write 40:d

[    0.580000] serial8250.0: ttyS1 at MMIO map 0x1d06000 mem 0xfbd06000 (irq = 41) is a 16550A

[    0.590000] Linux video capture interface: v2.00

[    0.590000] vpfe_init

[    0.600000] starting ccdc_reset...<7>

[    0.600000] End of ccdc_reset...<5>vpfe_probe

[    0.610000] TVP5150 : nummber of channels = 1

[    0.610000] vpfe ccdc capture vpfe ccdc capture.1: vpif_register_decoder: decoder = TVP5150

[    0.620000] oom-killer: gfp_mask=0xd1, order=10

[    0.630000] Mem-info:

[    0.630000] DMA per-cpu:

[    0.630000] cpu 0 hot: high 18, batch 3 used:2

[    0.640000] cpu 0 cold: high 6, batch 1 used:0

[    0.640000] DMA32 per-cpu: empty

[    0.640000] Normal per-cpu: empty

[    0.650000] HighMem per-cpu: empty

[    0.650000] Free pages:       21880kB (0kB HighMem)

[    0.660000] Active:0 inactive:0 dirty:0 writeback:0 unstable:0 free:5470 slab:166 mapped:0 pagetables:0

[    0.670000] DMA free:21880kB min:1144kB low:1428kB high:1716kB active:0kB inactive:0kB present:81920kB pages_scanned:0 all_unreclaimable? no

[    0.680000] lowmem_reserve[]: 0 0 0 0

[    0.680000] DMA32 free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no

[    0.690000] lowmem_reserve[]: 0 0 0 0

[    0.700000] Normal free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no

[    0.710000] lowmem_reserve[]: 0 0 0 0

[    0.710000] HighMem free:0kB min:128kB low:128kB high:128kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no

[    0.720000] lowmem_reserve[]: 0 0 0 0

[    0.730000] DMA: 0*4kB 10*8kB 16*16kB 8*32kB 5*64kB 8*128kB 8*256kB 9*512kB 3*1024kB 5*2048kB 0*4096kB 0*8192kB 0*16384kB = 21904kB

[    0.740000] DMA32: empty

[    0.740000] Normal: empty

[    0.750000] HighMem: empty

[    0.750000] Swap cache: add 0, delete 0, find 0/0, race 0+0

[    0.750000] Free swap  = 0kB

[    0.760000] Total swap = 0kB

[    0.760000] Free swap:            0kB

[    0.770000] 20480 pages of RAM

[    0.770000] 5497 free pages

[    0.770000] 14697 reserved pages

[    0.780000] 166 slab pages

[    0.780000] 0 pages shared

[    0.780000] 0 pages swap cached

[    0.790000] Out of Memory: Kill process 2 (posix_cpu_timer) score 0 and children.

[    0.790000] Out of Memory: Kill process 2 (posix_cpu_timer) score 0 and children.

[    0.800000] Out of Memory: Kill process 2 (posix_cpu_timer) score 0 and children.

[    0.810000] Out of Memory: Kill process 2 (posix_cpu_timer) score 0 and children.

[    0.820000] Out of Memory: Kill process 2 (posix_cpu_timer) score 0 and children.

[    0.820000] Out of Memory: Kill process 2 (posix_cpu_timer) score 0 and children.

后来，我修改了mem的大小。如下所示，把80M改为120M.

setenv bootargs mem=120M console=ttyS0,115200n8 root=/dev/mtdblock3 rootfstype=jffs2 noinitrd rw init=/linuxrc davinci_enc_mngr.ch0_output=LCD davinci_capture.device_type=4 dm365_imp.oper_mode=0 mtdparts=physmap-flash.0:384K(bootloader),128K(params),2M(kernel),12M(jffs2) time lpj=741376

这样子，就不会报空间不足的错误，程序可以往下正常运行了。不过，还是无法正常显示，仍然是白屏，且有时候变红，有时候变绿，变来变去的。

你本来给到屏幕的是个什么样的东西呢？有没有按照屏的SPEC要求的时序来配置你代码里面出现的参数？这个都是可以用示波器来量出来的。

本来给屏幕的是分辨率为800X480的PRGB格式的数据。现在屏幕改为1366X768分辨率了。

请问，您的邮箱地址或QQ号码是多少？我把LCD屏的资料发给你。因为我看LCD屏资料，并没有特别指明场同步之类的参数。只有分辨率和CLK参数。

这个论坛可以发附件的。

此外，同步信号的极性等都是需要考虑的

建议你无论如何还是先用示波器量一下有没有这些个信号

你的问题很大可能是H sync和V sync的极性两边不匹配.