SN65DSI86: How can I shorten the time to write registers

chen sibo

Part Number: SN65DSI86

Hi Ti,

I need to 0x0320,0x0321,0x0322,0x0333 respectively 0xaa,0xbb,0xcc,0xdd, takes 30 ms of time, how to modify the code written registers can shorten the time?

Here is my code:

edp_write_reg(0xF4, 0xFF);
edp_write_reg(0x64, 0xaa);
edp_write_reg(0x74, 0x00);
edp_write_reg(0x75, 0x03);
edp_write_reg(0x76, 0x20);
edp_write_reg(0x77, 0x01);
edp_write_reg(0x78, 0x81);
mdelay(10);

edp_write_reg(0xF4, 0xFF);
edp_write_reg(0x64, 0xbb);
edp_write_reg(0x74, 0x00);
edp_write_reg(0x75, 0x03);
edp_write_reg(0x76, 0x21);
edp_write_reg(0x77, 0x01);
edp_write_reg(0x78, 0x81);
mdelay(10);

edp_write_reg(0xF4, 0xFF);
edp_write_reg(0x64, 0xcc);
edp_write_reg(0x74, 0x00);
edp_write_reg(0x75, 0x03);
edp_write_reg(0x76, 0x22);
edp_write_reg(0x77, 0x01);
edp_write_reg(0x78, 0x81);
mdelay(10);

edp_write_reg(0xF4, 0xFF);
edp_write_reg(0x64, 0xcc);
edp_write_reg(0x74, 0x00);
edp_write_reg(0x75, 0x03);
edp_write_reg(0x76, 0x23);
edp_write_reg(0x77, 0x01);
edp_write_reg(0x78, 0x81);

over 2 years ago

0 David (ASIC) Liu over 2 years ago

TI__Guru**** 176811 points

Hi,

The SN65DSI86 I2C interface supports fast mode transfers up to 400 kbps. so you can use fast mode.

In your code, you have a mdelay, is it possible to cut down on the delay time?

The AUX bus is a 1Mbps bus, but this timing is largely depend on the sink itself on when the sink responds to the AUX read/write request coming from DSI86.

Thanks

David

0 chen sibo over 2 years ago in reply to David (ASIC) Liu

Prodigy 110 points

Hi David，

1. The delay in the code can be reduced. The 10ms delay is written according to the code you provide:
2.What does a 10ms delay do? Is it necessary? Can the time be shortened?
3. I need to write values to each of the four register addresses at once. How should the code be modified to shorten the time of writing registers? It takes 30ms to write a value, which is too long
4. We use 400 kbps

SN65DSI86: How to modify the specified register of OLED Panel through i2c over aux - Interface forum - Interface - TI E2E support forums，

+1 David (ASIC) Liu over 2 years ago in reply to chen sibo

TI__Guru**** 176811 points

Hi,

10ms delay was added to make sure the DSI86 has the time to finish the write to the DPCD register on the AUX bus and the sink has the time to process the write request. One thing you want to check after sending the AUX write request is to make sure the SEND_INT bit is set and there is no error. So you can map status register 0xF4 to the mask register 0xE5 and use interrupt from DSI86 instead the fixed 10ms to shorten the time.

Thanks

David