AM2434: Does the I2C support DMA mode?

Shaoxing Ke

Part Number: AM2434

Hi champs,

I am asking for my customer here!

Customer need the I2C and ADC support the DMA mode. but I have checked the below info. Is the peripheral DMA no support the I2C and DMA?

If so, how to solve customer requirement by using method? Thanks.

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1086787/faq-mcu-plus-sdk-am243x-am2x---dma-mode-support-for-peripherals/4023303?tisearch=e2e-sitesearch&keymatch=I2C%2525252520DMA#4023303

over 2 years ago

0 Frank Livingston over 2 years ago

TI__Mastermind 29558 points

Hi Shaoxing,

Shaoxing Ke said:
Customer need the I2C and ADC support the DMA mode.

For I2C, please see the AM243x TRM, 12.1.3.1.2 I2C Not Supported Features, DMA mode is not supported on the device.

For the ADC, I see the HW connections between ADC and PDMA. However, there is no plan to add DMA support to the ADC driver. I'll ask the SW Dev team about why this isn't planned and get back with you.

Regards,
Frank

0 Shaoxing Ke over 2 years ago in reply to Frank Livingston

TI__Expert 3590 points

Hello Frank,

Please help to check the DMA support to the ADC driver, thanks.

0 Frank Livingston over 2 years ago in reply to Shaoxing Ke

TI__Mastermind 29558 points

Hi Shaoxing,

I confirmed this is a mistake in the FAQ. There is also a mistaken in the SDK 08.05 RN: https://software-dl.ti.com/mcu-plus-sdk/esd/AM243X/08_05_00_24/exports/docs/api_guide_am243x/RELEASE_NOTES_08_05_00_PAGE.html

There is an SDK ADC example that uses DMA, please see: https://software-dl.ti.com/mcu-plus-sdk/esd/AM243X/08_05_00_24/exports/docs/api_guide_am243x/EXAMPLES_DRIVERS_UDMA_ADC_READ.html

Regards,
Frank

0 Shaoxing Ke over 2 years ago in reply to Frank Livingston

TI__Expert 3590 points

Hi Frank,

Very thanks for your confirm info.

0 Shaoxing Ke over 2 years ago in reply to Frank Livingston

TI__Expert 3590 points

Hello Frank,

For I2C Not Supported Features, DMA mode is not supported on the device, do we have any other solution to speed up the data transfer?

Could we support customer use the PRU to achieve the data transfer? Thanks.

0 Frank Livingston over 2 years ago in reply to Shaoxing Ke

TI__Mastermind 29558 points

Hi Shaoxing,

Shaoxing Ke said:
Could we support customer use the PRU to achieve the data transfer?

Yes, PRU can be used for I2C. Currently there is no support for this in the MCU+SDK.

There was support (PRU firwmare + A8/A9 driver) for this in Processor-SDK-RTOS for Sitara devices (e.g. AM335x), but it would need to be ported to MCU+SDK. Please see: https://software-dl.ti.com/processor-sdk-rtos/esd/docs/06_03_00_106/AM335X/rtos/index_pru_icss_fw.html#pru-icss-i2c

Regards,
Frank

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AM2434: Does the I2C support DMA mode?