Compiler/TM4C129XNCZAD: The limitation of uDMA channel setting

QZboy

Part Number: TM4C129XNCZAD

Tool/software: TI C/C++ Compiler

Hello,

My project need to use 10 sets of I2C DMA channel, but I found that both I2C5 and I2C8 are using the same channel group (CH22 & CH23)

is there any solution for me to set 10 independent I2C DMA that can transfer data in parallel?

over 7 years ago

0 Bob Crosby over 7 years ago

TI__Guru 72500 points

Unfortunately your understanding is correct. You cannot use the uDMA on I2C5 and I2C8 at the same time.

0 QZboy over 7 years ago in reply to Bob Crosby

Prodigy 90 points

QQ... do you have any suggestion for my problem?

0 Bob Crosby over 7 years ago in reply to QZboy

TI__Guru 72500 points

I suggest that you use interrupts instead of DMA on one of the channels. You have an 8 buffer FIFO on the I2C. Obviously choose one of the slower I2C devices if possible. Just be careful not to spend much time in your DMA interrupt routines. Using Ping-pong mode and setting flags for which buffer is full allows you to process the data from the other 9 I2C interfaces in the main loop and avoids long interrupt routines.

0 QZboy over 7 years ago in reply to Bob Crosby

Prodigy 90 points

Thank you for your advice .

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Compiler/TM4C129XNCZAD: The limitation of uDMA channel setting