CCS/TM4C129ENCPDT: Increasing speed in USB transmision to get ADC data

Sergio Mamani

Tool/software: Code Composer Studio

I am using the DMA ADC to get the data as fastest as possible to the USB buffer, then the data is sended to the PC, The maximun sample rate that I can achieve without cuts of data is 64000 samples per second. I am using an ULPI module (USB3300) in order to achieve "High Speed", but as you can see, 64000 x 12 = 768000 bits per second, Is not even a Mega Bit per second. How can I increase the speed of my sistem?.

over 9 years ago

0 Charles Tsai over 9 years ago

TI__Guru**** 191886 points

Hi Sergio,
Please take a look at these two posts which may answer your question.

e2e.ti.com/.../2003527
e2e.ti.com/.../1452417

0 Sergio Mamani over 9 years ago in reply to Charles Tsai

Intellectual 365 points

Hi Charles, the ULPI is working fine, the problem is that (I should have explain this in the first post) in order to have a constant acquisition of data I am sending small packets of data, 32 ADC samples per transmision, I do not have problems with the ULPI, I want to know how can I increase the speed of the system, by now I pass the ADC to the USB buffer with DMA, is there a faster way to send the data to the PC than "USBBufferDataWritten"

0 Petrei over 9 years ago in reply to Sergio Mamani

Guru 26105 points

Hi,

What is your ADC sampling frequency?

0 Charles Tsai over 9 years ago in reply to Petrei

TI__Guru**** 191886 points

Hi,
I'm not an USB expert. Perhaps you can first check if your host is recognizing the MCU as a HS device during enumeration.

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CCS/TM4C129ENCPDT: Increasing speed in USB transmision to get ADC data