SN65DSI85EVM: 0XE5寄存器读到0x09

element

Part Number: SN65DSI85EVM
Other Parts Discussed in Thread: SN65DSI85, , SN65DSI84

使用SN65DSI85将single MIPI信号转换成dual LVDS信号。

通过I2C写寄存器，读寄存器确认写命令都成功了。

但是读0XE5寄存器，返回值是0x09. 请问0XE5寄存器的错误码代表什么意思呢？

2 年多前

0 Kailyn Chen 2 年多前

TI__Guru**** 295050 points

E5读取值为0x09，说明bit3和bit1为1，bit1=1 代表的PLL未锁存，bit3=1代表的是主机检测到低级协议错误。包括包括 SOT 和 EOT 同步错误、退出模式输入命令错误、LP 传输同步错误和错误控制错误。

另外，读取E5报错，是否有按照datasheet中的初始化的步骤进行初始化，其中第10步配置E5和E6 为FF对这两个寄存器清零？

0 element 2 年多前回复 Kailyn Chen

时序是按照datasheet的初始化步骤初始化的，以下代码是在 MIPI LP11写入命令和HS state检查0xE5寄存器。

因为是single mipi，所以没有检查0xE6寄存器。

//call in LP11 state
//init seq 5,6,7
static int sn65dsi_reg_init(void)
{
        int ret = 0;
        pr_err("%s\n",__func__);

	ret |= sn65dsi_write_reg(0x09, 0x00);
	ret |= sn65dsi_write_reg(0x0A, 0x05);
	ret |= sn65dsi_write_reg(0x0B, 0x28);
	ret |= sn65dsi_write_reg(0x0D, 0x00);
	ret |= sn65dsi_write_reg(0x10, 0x26);
	ret |= sn65dsi_write_reg(0x11, 0x00);
	ret |= sn65dsi_write_reg(0x12, 0x59);
	ret |= sn65dsi_write_reg(0x13, 0x00);
	ret |= sn65dsi_write_reg(0x18, 0x78);
	ret |= sn65dsi_write_reg(0x19, 0x00);
	ret |= sn65dsi_write_reg(0x1A, 0x03);
	ret |= sn65dsi_write_reg(0x1B, 0x00);
	ret |= sn65dsi_write_reg(0x20, 0x80);
	ret |= sn65dsi_write_reg(0x21, 0x07);
	ret |= sn65dsi_write_reg(0x22, 0x00);
	ret |= sn65dsi_write_reg(0x23, 0x00);
	ret |= sn65dsi_write_reg(0x24, 0x38);
	ret |= sn65dsi_write_reg(0x25, 0x04);
	ret |= sn65dsi_write_reg(0x26, 0x00);
	ret |= sn65dsi_write_reg(0x27, 0x00);
	ret |= sn65dsi_write_reg(0x28, 0x20);
	ret |= sn65dsi_write_reg(0x29, 0x00);
	ret |= sn65dsi_write_reg(0x2A, 0x00);
	ret |= sn65dsi_write_reg(0x2B, 0x00);
	ret |= sn65dsi_write_reg(0x2C, 0x2c);
	ret |= sn65dsi_write_reg(0x2D, 0x00);
	ret |= sn65dsi_write_reg(0x2E, 0x00);
	ret |= sn65dsi_write_reg(0x2F, 0x00);
	ret |= sn65dsi_write_reg(0x30, 0x05);
	ret |= sn65dsi_write_reg(0x31, 0x00);
	ret |= sn65dsi_write_reg(0x32, 0x00);
	ret |= sn65dsi_write_reg(0x33, 0x00);
	ret |= sn65dsi_write_reg(0x34, 0x94);
	ret |= sn65dsi_write_reg(0x35, 0x00);
	ret |= sn65dsi_write_reg(0x36, 0x24);
	ret |= sn65dsi_write_reg(0x37, 0x00);
	ret |= sn65dsi_write_reg(0x38, 0x58);
	ret |= sn65dsi_write_reg(0x39, 0x00);
	ret |= sn65dsi_write_reg(0x3A, 0x04);
	ret |= sn65dsi_write_reg(0x3B, 0x00);
	ret |= sn65dsi_write_reg(0x3C, 0x10);
	ret |= sn65dsi_write_reg(0x3D, 0x00);
	ret |= sn65dsi_write_reg(0x3E, 0x00);

    ret |= sn65dsi_write_reg(0x0D, 0x00);
	msleep(10);
    ret |= sn65dsi_write_reg(0x09, 0x00);
	msleep(10);

	pr_err("[LCD]%s: sn65dsi i2c cmd  over \n",__func__);
    return ret;
}
//call in HS state
//init seq 9,10,11
void sn65dsi_check_register(void)
{
	int ret;

	sn65dsi_read_register();
	sn65dsi_write_reg(0xE5, 0xFF);
	msleep(1);
	ret = sn65dsi_read_reg(0XE5);
	if(ret != 0){
		dev_info(&sn65dsi_data->sn65dsi_chip->dev,"chip sn65dsixx 0xE5 error: 0x%X \n", ret);
	}else{
		dev_info(&sn65dsi_data->sn65dsi_chip->dev,"chip sn65dsixx 0xE5 success: 0x%X\n", ret);
	}

}

下图是测量时序，图一依次是VCC, MIPI_D0P, MIPI_CLKP, EN.

图二依次是I2C_CLK , MIPI_D0P, MIPI_CLKP, EN