hdmiout 68411升级

68411 是麦道微代理的一款hdmiout ic， 可以完成主芯片信源通道的扩展功能。
这里主芯片输出vb1 给68411， 然后68411 输出vb1 及一路hdmi out。该ic 也是一块由I2c控制的芯片但却是非标的i2c，所以我们需要对协议进行调整。

1. 总线配置

关于总线配置，可以参考"mstar 平台内核i2c总线介绍"
这篇博客。

2. 升级流程

novatek 升级流程，主要包含以下几个步骤：
一. ISP 模式设置；
二. 关闭写保护；
三. 擦除novatek 存储分区；
四. 写分区；
五. 校验分区；
六 . 开启写保护，退出ISP模式；

code 如下：

MAPI_BOOL mapi_i2c::doUpgradeNovaTek(const char* filePath)
{MAPI_BOOL bRet      = MAPI_FALSE;MS_U16 u16Page      = 0x000;MAPI_U8 u8CurPage   = 0x00;MAPI_BOOL bSkipPage = MAPI_FALSE;int nFileFd = open(NOVA_TEK_MASTER_DEV, O_RDWR);if(nFileFd < 0){return MAPI_FALSE;}bRet = NovaTekLoadFwBin(filePath);if(!bRet){goto END;}configIIcSpeed(nFileFd,50);if(!NovaTekEnterIsp(nFileFd)){bRet = MAPI_FALSE;close(nFileFd);return bRet;}configIIcSpeed(nFileFd,100);if(DualFwEnable == 1){NovaTekEraseIDSector(nFileFd);}if(!NovaTekTErase(nFileFd)){bRet = MAPI_FALSE;goto END;}configIIcSpeed(nFileFd,400);MaxPages = Flash.Page;if(DualFwEnable == 1){CodePages   = MaxPages/2 ;FlashOffset = MaxPages/2 ;}else{CodePages = MaxPages;FlashOffset = 0;}if (McuId == 0xa390 || McuId == 0xA400 || McuId == 0xA450){bRet = NovaTek68390ProgramEnable(nFileFd, MAPI_TRUE);}for(u16Page = FlashOffset; (u16Page<(CodePages+FlashOffset))&&(u16Page<TOTAL_PAGE_SIZE); u16Page++){u8CurPage = (u16Page - FlashOffset)%256;bRet = NovaTekSetExntend(nFileFd,u16Page);if(!bRet){goto END;}else{g_current_bank  = u16Page>>8;}SPageSum  = 0;bSkipPage = MAPI_TRUE;for (int i = 0; i < 512; i++){if(BinFilePageBuffer[u16Page-FlashOffset][i] != 0xff){bSkipPage = MAPI_FALSE;}SPageSum += BinFilePageBuffer[u16Page-FlashOffset][i];}if (NovaTekCheckOverLap(u8CurPage)){bSkipPage = MAPI_TRUE;}if(!bSkipPage)   //Bypass program?{bRet = NovaTekTProgram(nFileFd,u16Page);if(!bRet){goto END;}}if(!bSkipPage){bRet = NovaTekCmdGetCheckSum(nFileFd, u8CurPage);if(!bRet){goto END;}}}if (McuId == 0xa390 || McuId == 0xA400 || McuId == 0xA450){bRet = NovaTek68390ProgramEnable(nFileFd, MAPI_FALSE);}if(DualFwEnable == 1){if(!NovaTekUpdateIDSector(nFileFd)){bRet = MAPI_FALSE;goto END;}}END:NovaTekBlockProtect(nFileFd,1);configIIcSpeed(nFileFd,100);NovaTekISPOff(nFileFd);close(nFileFd);if(!bRet){printf("[%s][%d] novatek upgrade failed. \n", __FUNCTION__,__LINE__);}else{printf("[%s][%d] novatek upgrade successully. \n", __FUNCTION__,__LINE__);}return bRet;
}

2.1 升级文件加载

novatek 提供的bin 升级文件大小为1M，分成2048 个page，每个page大小为512 Bytes。

static MAPI_BOOL NovaTekLoadFwBin(const char* FwPath)
{int nLen = 0;FILE *pHandle = NULL;char binFile[1024];MS_U8  u8RSize     = 0x00;MS_U16 u16PageNo   = 0x0000;MS_U16 u16PageCnt  = 0x0000;MS_U32 u32TotalLen = 0x0000;int nCurPosition   = 0;MAPI_BOOL bRet     = MAPI_FALSE;memset(binFile,0x00,sizeof(binFile));memcpy(binFile,FwPath,strlen(FwPath));pHandle = fopen(binFile, "r");if(pHandle == NULL){return MAPI_FALSE;}fseek(pHandle, 0, SEEK_END);nLen = ftell(pHandle);if(nLen != 1024*1024){fclose(pHandle);return MAPI_FALSE;}u16PageCnt = nLen/512;// set to the file headfseek(pHandle, 0, SEEK_SET);for (u16PageNo = 0; u16PageNo < u16PageCnt; u16PageNo++){u8RSize = fread(BinFilePageBuffer[u16PageNo], sizeof(char)*512, 1, pHandle);u32TotalLen = u32TotalLen + u8RSize*512; // bytesif(u8RSize <= 0){bRet = MAPI_FALSE;break;}}nCurPosition = ftell(pHandle);if(nCurPosition >= nLen){bRet = MAPI_TRUE;}fclose(pHandle);return bRet;
}

将升级文件存储在BinFilePageBuffer[2048][512] 的二维结构体中。

2.2 进入ISP mode

蓝色框框中的byte 序列就是发送给ic 的指令，发送完成之后，就可以通过reply 指令读取mcu id，本款芯片的mcu id 是0xA400。

static MAPI_BOOL NovaTekEnterIsp(int nDevFd)
{MAPI_BOOL bStep1 = MAPI_FALSE;MAPI_BOOL bStep2 = MAPI_FALSE;MAPI_BOOL bStep3 = MAPI_FALSE;MAPI_BOOL bStep4 = MAPI_FALSE;MAPI_BOOL bStep5 = MAPI_FALSE;NOVATEK_DG(printf("[%s][%d] Enter .\n", __FUNCTION__,__LINE__);)do{bStep1 = NovaTekISPOn(nDevFd);if(!bStep1){printf("[%s][%d] novatek enter isp on mode failed. \n", __FUNCTION__,__LINE__);break;}bStep2 = NovaTekSendSpecialCmd(nDevFd);if(!bStep2){printf("[%s][%d] send special cmd to novatek failed. \n", __FUNCTION__,__LINE__);break;}bStep3 = NovaTekGetFlashId(nDevFd);if(!bStep3){printf("[%s][%d] novatek get flash id failed. \n", __FUNCTION__,__LINE__);break;}bStep4 = NovaTekWpEnable(nDevFd);if(!bStep4){printf("[%s][%d] novatek wp enable failed. \n", __FUNCTION__,__LINE__);break;}bStep5 = NovaTekBlockProtect(nDevFd,0);if(!bStep5){printf("[%s][%d] novatek block protect failed. \n", __FUNCTION__,__LINE__);break;}}while(0);return (bStep5 && bStep4 && bStep3 && bStep2 && bStep1);
}

NovaTekISPOn 是发送enter isp 的指令并通过reply 值校验mcu id。NovaTekSendSpecialCmd 发送一些特殊指令配置芯片烧写前的状态。NovaTekGetFlashId 读取flash id。
NovaTekWpEnable 设置novatek 模组wp 脚。NovaTekBlockProtect 关闭写保护。

2.3 擦除芯片

static MAPI_BOOL NovaTekTErase(int nDevFd)
{MAPI_BOOL bRet  = MAPI_FALSE;MS_U32 BlkStart = 0x0000;MS_U32 BlkEnd   = 0x0000;if (McuId == 0xa390 || McuId == 0xA400 || McuId == 0xA450){bRet = NovaTek68390ProgramEnable(nDevFd, MAPI_TRUE);}{bRet = NovaTekChipErase(nDevFd);//6seconds M25P20 erase time max<6sec//5seconds w25x40b erase time max<4secusleep(5*1000*1000);bRet = NovaTekChipEraseReply(nDevFd);if(!bRet){return MAPI_FALSE;}}if (McuId == 0xa390 || McuId == 0xA400 || McuId == 0xA450){bRet = NovaTek68390ProgramEnable(nDevFd, MAPI_FALSE);}return bRet;
}

2.4 升级芯片

    for(u16Page = FlashOffset; (u16Page<(CodePages+FlashOffset))&&(u16Page<TOTAL_PAGE_SIZE); u16Page++){u8CurPage = (u16Page - FlashOffset)%256;bRet = NovaTekSetExntend(nFileFd,u16Page);if(!bRet){printf("[%s][%d][error] set bank: 0x%x failed. \n", __FUNCTION__,__LINE__,u16Page>>8);goto END;}else{g_current_bank  = u16Page>>8;}printf("\n\n[%s][%d] start upgrade bank[%d], page[%d] \n",__FUNCTION__,__LINE__,g_current_bank,u8CurPage);SPageSum  = 0;bSkipPage = MAPI_TRUE;for (int i = 0; i < 512; i++){if(BinFilePageBuffer[u16Page-FlashOffset][i] != 0xff){bSkipPage = MAPI_FALSE;}SPageSum += BinFilePageBuffer[u16Page-FlashOffset][i];}if (NovaTekCheckOverLap(u8CurPage)){bSkipPage = MAPI_TRUE;}printf("\n[%s][%d] bSkipPage: %d, SPageSum: 0x%4x \n",__FUNCTION__,__LINE__,bSkipPage,SPageSum);if(!bSkipPage)   //Bypass program?{bRet = NovaTekTProgram(nFileFd,u16Page);if(!bRet){printf("[%s][%d][error] T Program failed\n", __FUNCTION__,__LINE__);goto END;}}printf("[%s][%d] bank: %d , Page : %d , SPageSum: 0x%4x .\n",__FUNCTION__,__LINE__,g_current_bank, u8CurPage,SPageSum);if(!bSkipPage){bRet = NovaTekCmdGetCheckSum(nFileFd, u8CurPage);if(!bRet){printf("[%s][%d][error] cmd get checksum failed\n", __FUNCTION__,__LINE__);goto END;}}printf("[%s][%d] upgrade bank[%d], page[%d] completed\n",__FUNCTION__,__LINE__,u16Page>>8,u8CurPage);}

将前面保存bin 的二维数组数据写入分区中。NovaTekSetExntend 设置bank(每个bank 256 page)， NovaTekTProgram 则是写page

static MAPI_BOOL NovaTekTProgram(int nDevFd, MS_U16 u16BufIndex)
{MAPI_BOOL bRet      = MAPI_FALSE;MAPI_BOOL bRetReply = MAPI_FALSE;bRet = NovaTekWritePgData(nDevFd, u16BufIndex);usleep(200*1000);bRetReply = NovaTekWritePgDataReply(nDevFd);return (bRetReply&&bRet);
}

NovaTekCmdGetCheckSum 则是对每个写入的page 进行校验，通过则继续写下个page 的数据。

2.5 升级完成

升级完成之后，NovaTekBlockProtect打开数据保护，NovaTekISPOff 退出ISP 模式，进入用户模式。

3. 协议客制化

由于novatek 协议主要是ISP ON指令的交互时是非标的，另外一些功能指令交互时的时钟周期不一样。所以我们只需要对这个两部分进行修改即可，没有必要将整个i2c 协议修改。

3.1 i2c 总线周期设置

#define NOVA_TEK__IIC_ADDR   (0x6E >> 1)
static MAPI_BOOL WriteBytesToDev(int nDevFd, MAPI_U8 u8Data[] , MAPI_U16 uDataLen)
{int nRet = -1;struct i2c_msg msg;struct i2c_rdwr_ioctl_data ioctl_data = {0};msg.addr          = NOVA_TEK__IIC_ADDR;msg.flags         = I2C_SMBUS_WRITE; /* write */msg.len           = uDataLen;msg.buf           = u8Data;ioctl_data.msgs   = &msg;ioctl_data.nmsgs  = 1;nRet = ioctl(nDevFd, I2C_RDWR, &ioctl_data);if( nRet < 0){return MAPI_FALSE;}return MAPI_TRUE;
}static MAPI_BOOL configIIcSpeed(int nDevFd, MS_U16 u16Spd)
{MS_U8 u8SRamPkg[4] = {0x88, 0x00, 0x00, 0x00};u8SRamPkg[1] = u16Spd >> 8;u8SRamPkg[2] = u16Spd & 0xFF;u8SRamPkg[3] = (MS_U8)(0x6E^u8SRamPkg[0]^u8SRamPkg[1]^u8SRamPkg[2]);if(WriteBytesToDev(nDevFd, u8SRamPkg, sizeof(u8SRamPkg)/sizeof(u8SRamPkg[0])) == MAPI_FALSE){return MAPI_FALSE;}return MAPI_TRUE;
}

configIIcSpeed 通过 /dev/i2c-2 对应novatek 设备(0x6E)发送指令“0x6E 0x04 0x88 speekH speedL checkSum” 其中speedH 为i2c周期的高8位，speedL为i2c周期的低8位。

在kernel 的master_xfer 回调中会处理i2c 指令，mstar 平台则在vendor\mstar\kernel\linaro\mstar2\drv\iic\mdrv_iic_io.c中

g_i2c_speed 提取i2c 总线速率。

u16  getCustomerSpeed(void)
{return g_i2c_speed;
}

3.2 ISP ON 指令客制化

int MDrv_SW_IIC_WriteBytesForCustomerIspEnable(u8 u8BusNum, u8 u8SlaveID, u16 u16size, u8* pu8Data, int stop)
{int bRet = -EIO;u16 u16Retries = g_IICBus[u8BusNum].u16Retries;u16 u16size_temp=0;u8* pu8Data_temp=(u8*)NULL;SWI2C_DBG_FUNC();if (u8BusAllocNum == 0)return -ENOENT;if (IIC_UseBusForCustomer(u8BusNum, getCustomerSpeed())  == FALSE){return -ENOENT;}u16size_temp = u16size;pu8Data_temp = (u8*)pu8Data;while (u16size_temp){u16size_temp--;if ( IIC_Start(u8BusNum) == FALSE){continue;}if (IIC_SendByte(u8BusNum, *pu8Data_temp) == FALSE) {// goto fail;}// switch to next bytepu8Data_temp++;}bRet = u16size - u16size_temp;iic_delay(u8BusNum);if (stop){IIC_Stop(u8BusNum);}return bRet;
}
EXPORT_SYMBOL(MDrv_SW_IIC_WriteBytesForCustomerIspEnable);

至此，整个升级流程我介绍完成，更多指令客制化可以自己根据需求修改。如果IO足够多也值可以使用IO口来模拟i2c，这样会减小对原生协议干扰。

参考资料：
https://app.yinxiang.com/Home.action#n=88618994-1419-47ef-923f-79ecaf89d7d0&s=s30&ses=4&sh=5&sds=2&