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请问下楼主,一楼这个是不是在Linux下使用呢?还是在裸机下使用?那段代码应该插入什么位置呢?是把CVBS的信号显示到LCD上面吗?
不好意思,萌新的问题有点多。
裸机下使用的
采集到的图像会存在0x80000000地址
可以通过下面这个函数判断是否检测到CVBS信号
static __u32 BSP_TVD_get_status(__u32 id)
{
__u32 reg_val = 0;
__u32 det = 0;
__u32 system = 0;
reg_val = REG_RD32(TVD_REGS_BASE+0x0e40);
if(reg_val&1)
{
det = 0;// no signal detect
}
else
{
det = 1;// detect tv signal
}
if(reg_val&(1<<18))
{
system = 1;//get system = pal
}
else{
system = 0;//get system = ntsc
}
__wrn("reg_val:0x%x, det:%d, system:%d\n", reg_val, det, system);
return ((det<<0)+(system<<4));//bit0=det bit4=system
}
不废话直接上图
初始化部分
#define TVD_BASE 0x01C0B000
ENABLE_BUSCLK(CCU_BUS_CLK_GATING_TVD_GATING);//BUS
SETBIT(CCU->DRAM_CLK_GATE,BIT3);//DRAM
CCU->PLL_VIDEO_CTRL=(1<<31);//VIDEO PLL
while(!(CCU->PLL_VIDEO_CTRL&(1<<28)));//297MHz
CCU->TVD_CLK=(1<<31)|(9); //SEL VIDEO PLL
mem32(TVD_BASE+0x0088)=0x4000000;
mem32(TVD_BASE+0x0088)&=0xFEFFFFFF&0xFFFFFFEF;
mem32(TVD_BASE+0x0E04) = 0x8002AAA8;
mem32(TVD_BASE+0x0000) = 0x1F00;
mem32(TVD_BASE+0x0F70) = 0x2010;
mem32(TVD_BASE+0x0F0C) = 0x10;
mem32(TVD_BASE+0x000C) = 0x202080;
mem32(TVD_BASE+0x0F6C)=0xFFFA0A;
mem32(TVD_BASE+0x0F44)=0x50823925;
mem32(TVD_BASE+0x0F24)=0x682810A;
mem32(TVD_BASE+0x0F28)=0x6440;
mem32(TVD_BASE+0x0014)=0x20000000;
mem32(TVD_BASE+0x0F4C)=0xE70106C;
mem32(TVD_BASE+0x0010)=0x2310080;
mem32(TVD_BASE+0x0008)=0x1101001;
mem32(TVD_BASE+0x0F08)=0x11590902;
mem32(TVD_BASE+0x0F0C)=0x40;
mem32(TVD_BASE+0x0F10)=0x8A32EC;
mem32(TVD_BASE+0x0F14)=0x800000A0;
mem32(TVD_BASE+0x000C)=0x2080;
mem32(TVD_BASE+0x0F1C)=0xDC0000;
mem32(TVD_BASE+0x0F24)=0x682810A;
mem32(TVD_BASE+0x0F28)=0x6440;
mem32(TVD_BASE+0x0014)=0x20000000;
mem32(TVD_BASE+0x0F44)=0x4632;
mem32(TVD_BASE+0x0F4C)=0xE70106C;
mem32(TVD_BASE+0x0F54)=0;
mem32(TVD_BASE+0x0F58)=0x82;
mem32(TVD_BASE+0x0F6C)=0xFFFA0A;
mem32(TVD_BASE+0x0F80)=0x500000;
mem32(TVD_BASE+0x0F84)=0xC10000;
mem32(TVD_BASE+0x001C)=0x870026;
mem32(TVD_BASE+0x0018)=0x2A098ACB;
mem32(TVD_BASE+0x0F2C)=0xD74;
mem32(TVD_BASE+0x0F74)=0x343;
mem32(TVD_BASE+0x0E04)=0x8002AAA8;
mem32(TVD_BASE+0x0040)=0x4000310;
mem32(TVD_BASE+0x0000)=0x11;
mem32(TVD_BASE+0x008C)=(mem32(TVD_BASE+0x008C)&(0xF800F000))|720|((576/2)<<16);
mem32(TVD_BASE+0x0E2C)=0x110000;
mem32(TVD_BASE+0x0000)=0x1F2F;
mem32(TVD_BASE+0x0F20)=0x2C0607;
mem32(TVD_BASE+0x0E28)=0x10026;
mem32(TVD_BASE+0x0FE0)=0;
mem32(TVD_BASE+0x0E04)&=~1;
mem32(TVD_BASE+0x0080)=0x80000000;
mem32(TVD_BASE+0x0088)|=0x10000000u;
mem32(TVD_BASE+0x0084)=0x80000000+1000000;
mem32(TVD_BASE+0x0088)|=0x10000000u;
SETBIT(mem32(TVD_BASE+0x0088),BIT0);
参考了之前A20 TVD的DRV的写法去猜寄存器的地址以及功能
好几个参数都是蒙对的
只能说这次有很大的运气成分
通过IDA逆向分析使用0xF1C0B000(不知道为什么是0xF1C0B000而不是0x01C0B000)作为基址的寄存器操作。然后根据现有的头文件去猜功能。
不过依然操作全是黑箱,不知道寄存器代表啥只能靠逆向出来的寄存器操作去初始化。也有一定的局限性。
之前不了解CVBS需要27MHz时钟用,24MHz调试了半天都没出来效果。偶然间才看见CVBS需要27MHz时钟。
驱动文件
tvd.zip
void InitSPI1(){
GPIOA->CFG[0]&=0xffff0000;
GPIOA->CFG[0]|=0x00001661;
SETBIT(CCU->BUS_SOFT_RST0,1<<CCU_BUS_CLK_GATING_SPI1_GATING);
ENABLE_BUSCLK(CCU_BUS_CLK_GATING_SPI1_GATING);
SPI1->CCR=0x00001000+2;
SPI1->GCR=SPI_GCR_SRST|SPI_GCR_MODE|SPI_GCR_TP_EN|SPI_GCR_EN;
while(SPI1->GCR&SPI_GCR_SRST);
SETBIT(SPI1->TCR,SPI_TCR_CPOL|SPI_TCR_CPHA|SPI_TCR_SS_OWNER);//SPI_TCR_CPOL|SPI_TCR_CPHA|
SETBIT(SPI1->FCR,SPI_FCR_RF_RST|SPI_FCR_TX_FIFO_RST|SPI_FCR_TF_DRQ_EN);
}
void InitDMA(){
ENABLE_BUSCLK(CCU_BUS_CLK_GATING_DMA_GATING);
SETBIT(CCU->BUS_SOFT_RST0,1<<CCU_BUS_CLK_GATING_DMA_GATING);
DMA->NDMA[0].CFG=NDMA_CFG_DESTINATION_DRQ_TYPE_CONFIDENTIAL_SET(NDMA_CFG_DRQ_SPI1_TX)|NDMA_CFG_SOURCE_DRQ_TYPE_SET(NDMA_CFG_DRQ_SDRAM_MEMORY)|NDMA_CFG_SOURCE_ADDRESS_TYPE_SET(NDMA_CFG_ADDRESS_LINEAR_MODE)|NDMA_CFG_DESTINATION_ADDRESS_TYPE_SET(NDMA_CFG_ADDRESS_IO_MODE)|NDMA_CFG_REMAIN_BYTE_COUNTER_READ_ENABLE|NDMA_CFG_WAIT_STATE_SET(NDMA_CFG_WAIT_STATE2);
DMA->NDMA[0].SRC_ADR=(u32)&lcdbuff;
DMA->NDMA[0].DES_ADR=(u32)&SPI1->TXD;
}
void flushDMA(){
SPI1->MBC=SPI1->MTC=SPI1->BCC=DMA->NDMA[0].BYTE_CNT=240*320*2;
SETBIT(DMA->NDMA[0].CFG,NDMA_CFG_LOADING);
SETBIT(SPI1->TCR,SPI_TCR_XCH);
while(DMA->NDMA[0].CFG&NDMA_CFG_BUSY_STATUS)SPI1->RXD;
SETBIT(SPI1->ISR,SPI_ISR_TC);
while(!(SPI1->ISR&SPI_ISR_TC))SPI1->RXD;
}
u8 lcdbuff[240*320*2] __attribute__((at(0x80000000)));
for(cnt=0;cnt<240*320;cnt++)lcdbuff[cnt]=0xff;
for(cnt=0;cnt<240*320;cnt++)lcdbuff[cnt+240*320]=0x0;
InitDMA();
ST7789_CS_CLR();
flushDMA();
ST7789_CS_SET();
我试了一下效果
https://whycan.cn/files/members/2421/shua.mp4
测试的过程中发现SPI的RXD如果不读也会卡住SPI,不知道有没有忽略RXD的方法。
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