AM2434: How to set the 4-bit mode and 1-bit mode of sdio for AM2434 development board+BP3351 module

Bill Gates

Prodigy 30 points

Part Number: AM2434
Other Parts Discussed in Thread: SYSCONFIG

The system is FreeRTOS.Can the mode of sdio be set? Where can the 4-bit mode and 1-bit mode be set in the code.

17 天前

0 Lydia 16 天前

TI__Mastermind 39605 points

Hello, we have received your case and the investigation will take some time. Thank you for your patience.

0 Lydia 15 天前

TI__Mastermind 39605 points

Hi,

Yes, the sdio mode can be configured, and this is done through SysConfig.

In SysConfig, navigate to the MMCSD section. By default, the driver selects the maximum supported speed and bus width automatically.

To manually configure the bus mode:

Open the MMCSD instance in SysConfig.
Disable the option “Auto assign maximum speed”.
Once this option is disabled, you will be able to explicitly select the bus width (1-bit or 4-bit mode) from the available configuration options.

I’ve attached a screenshot for reference showing where this option can be found in SysConfig.

0 Lydia 14 天前回复 Lydia

TI__Mastermind 39605 points

Hi,

The suggestions above regarding changing the bit positions seem acceptable.

However, SDIO is not currently supported in the MCU+SDK. If the customer wants to achieve SDIO functionality, they will need to modify the MMCSD driver according to the SDIO protocol.

0 Bill Gates 10 天前回复 Lydia

Prodigy 30 points

Thank you. But this picture cannot be loaded and cannot be seen. Can you resend it?

0 Bill Gates 10 天前回复 Lydia

Prodigy 30 points

Thank you. Can you provide an example of the SDIO interface driver on the development board I am using? Or SDIO drivers on similar development boards, I don't know how to implement the driver for this SDIO interface.

0 Bill Gates 3 天前回复 Lydia

Prodigy 40 points

May I ask if you can send the screenshot again? I don't know how to configure it in the SysConfig tool.Thank you.

0 Lydia 2 天前回复 Bill Gates

TI__Mastermind 39605 points

I’ve attached a screenshot for reference showing where this option can be found in SysConfig.

0 Lydia 1 天前回复 Bill Gates

TI__Mastermind 39605 points

The SDIO mode is not supported in the MCU+SDK.

However, with some modifications to the eMMC code, we should be able to make it work.

but please note that this must be tested on the customer's side since it is not officially supported in the MCU+SDK.

0 Bill Gates 13 小时前回复 Lydia

Prodigy 30 points

Thank you, but my tool interface does not have corresponding options. Why is there such a difference?

0 Bill Gates 13 小时前回复 Lydia

Prodigy 30 points

How to modify eMMC code? Can you provide a reference column? Are there similar reference examples on TI's official website or other websites?

0 Lydia 12 小时前回复 Bill Gates

TI__Mastermind 39605 points

For the SDIO configuration, you would need to manually setup the required MMCSD instance and the pinmux configurations. This can be implemented in a similar way to what happens in the System_init() API that is given. Instead of the default MMCSD_init() API, you can make a custom API with the changes required for SDIO. In this setup itself, you would be able to setup the attributes for the SDIO including 1 bit or 4 bit mode.

You could also take reference from the Linux implementation of SDIO on the Processor SDK.

The SDIO mode is however, not supported in the MCU+SDK and must be tested on the customer's side.

0 Bill Gates 11 小时前回复 Lydia

Prodigy 30 points

Is it modified in the MMCSD_init() function? 1 bit or 4 bit？

0 Lydia 10 小时前回复 Bill Gates

TI__Mastermind 39605 points

If you modify inside the MMCSD_init which is present in the System_init API - it will get overwritten - as that is generated code. You would need to create seperate files similar to the image:

The files would also need to be added to the makefile of the example, so its compiled. Additionally, do make sure the MMCSD instance in that is opened in the default MCU+SDK flow is closed or removed such that there is no error in opening this instance.

The init API in itself does not need modification, rather the configurations that are being used in the init: