DS90UB941AS-Q1: In a structure like mine, how do I set up the UB941 aliases so that the processor can iic access both Dispaly A and Dispaly B at the same time.

zhu junfeng

Part Number: DS90UB941AS-Q1

Hi TI members:

The block diagram is as follows, I want to access displayA and B at the same time, I configure the UB941 alias register as follows to access displayA（0x35 alias） only, there is no way to access displayB（0x36 alias ）.

#define TFT_MCU_CLIENT_ADDRESS (0x35)

#define TFT_MCU_ALIAS_A (0x35)

#define TFT_MCU_ALIAS_A (0x36)

#if 1

{0x0c, 0x1E, 0x01, 0x5},

{0x0c, 0x07, TFT_MCU_CLIENT_ADDRESS<< 1, 0x5},

{0x0c, 0x08, TFT_MCU_ALIAS_A<< 1, 0x5},

{0x0c, 0x03, 0x9A, 0x5},

{0x0c, 0x1E, 0x02, 0x5},

{0x0c, 0x07, TFT_MCU_CLIENT_ADDRESS<< 1, 0x5},

{0x0c, 0x08, TFT_MCU_ALIAS_B<< 1, 0x5},

#endif

over 1 year ago

0 zhu junfeng over 1 year ago

Prodigy 201 points

Sorry about the mistake.

#define TFT_MCU_ALIAS_B (0x36)

0 Ben Dattilo over 1 year ago in reply to zhu junfeng

TI__Mastermind 25765 points

Hello,

zhu junfeng said:
{0x0c, 0x1E, 0x02, 0x5},

{0x0c, 0x07, TFT_MCU_CLIENT_ADDRESS<< 1, 0x5},

{0x0c, 0x08, TFT_MCU_ALIAS_B<< 1, 0x5},

The above portion of code is overriding the below:

zhu junfeng said:
#if 1

{0x0c, 0x1E, 0x01, 0x5},

{0x0c, 0x07, TFT_MCU_CLIENT_ADDRESS<< 1, 0x5},

{0x0c, 0x08, TFT_MCU_ALIAS_A<< 1, 0x5},

{0x0c, 0x03, 0x9A, 0x5},

If you need to program multiple aliases, you will need to use registers 0x07 and 0x08 for the first ID/Alias, then for the second, you should use the additional registers found in addresses 0x70-0x7D:

Additionally, it seems that the SER I2C address in the block diagram does not match the address used in your code. Please make sure you are using the correct SER address.

Regards,

Ben

0 zhu junfeng over 1 year ago in reply to Ben Dattilo

Prodigy 201 points

Hi Ben,

Thanks for the quick reply.I'm confused here.The above portion of code is overriding the below.I'm aliasing port0 and port1 here.

Regards

+1 Ben Dattilo over 1 year ago in reply to zhu junfeng

TI__Mastermind 25765 points

Hello,

This register can only be programmed for one remote device. The port select determines which port the remote device is accessed through. For the second remote device, please use the additional registers I mentioned previously.

Regards,

Ben Dattilo

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DS90UB941AS-Q1: In a structure like mine, how do I set up the UB941 aliases so that the processor can iic access both Dispaly A and Dispaly B at the same time.