AM1705 Programmable Real-Time Unit Subsystem as I2C & UART drivers for linux

Jitendra Jagasia

Other Parts Discussed in Thread: AM1705

Hi,

Have anyone used AM1705 Programmable Real-Time Unit Subsystem as I2C & UART. Can anyone provide procedure or steps to how to create PRUSS I2C & UART drivers for linux platform.

Please reply to the above query

Thank you

over 14 years ago

0 clam over 14 years ago

TI__Expert 8785 points

For the PRU UART, you can find more information here, http://focus.ti.com/dsp/docs/thirdparty/catalog/devtoolsproductfolder.tsp?actionPerformed=productFolder&productId=7177.

For the PRU I2C, I'm don't believe TI has developed a software implementation for it.

--Christina

0 K Md Feroz Irfan over 14 years ago in reply to clam

TI__Expert 7225 points

The source code for Mistral's UART driver can be found at:
http://mistralsolutions.com/pes-support/support-downloads/l13x-daughter-card-documentation-software.html

After applying the patch, the Mistral UART code is found under drivers/serial/omapl_pru. This code, along with those in the PRU Firmware Source Files (hal directory), could serve as a model for an I2C driver. An I2C implementation could reuse the files in pru/hal/common (found within the PRU Firmware Source Files). Additionally, the PRU assembly code for UART is located in pru/firmware/uart.

The PRU pins that can be used depend on what other chip peripherals the customer requires. I recommend using the pinmux utility (http://focus.ti.com/dsp/docs/litabsmultiplefilelist.tsp?sectionId=3&tabId=409&literatureNumber=sprab06a&docCategoryId=1&familyId=1621). In the utility, check the peripheral boxes required by the customer and see which PRU pins do not conflict with these peripherals.

Thanks to Melissa Watkins for the above inputs!

Best Regards

Feroz

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AM1705 Programmable Real-Time Unit Subsystem as I2C & UART drivers for linux