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CC3351: CC3351: 使用 Nuttx RTOS 點亮 BP-CC3351

Austin Chen — Tue, 24 Mar 2026 07:01:54 GMT

Part Number: CC3351

Hi TI team,

我們嘗試將 TI 的 STM32 MCU for RTOS 範例程式碼移植到我們的系統 (Nuttx) 上。目前，我們可以運行到您的「獲取設備資訊」階段。

但會遇到 CRC error 以及 card busy 的問題，導致無法成功 briung up.

這是我們的設計流程，目前卡在Step3 會出現上面的 card busy 以及 CRC error ，請問流程是否有誤?

以下是邏輯分析儀工具，以及記錄檔

Ti_cc3351_分析檔案.zip

分析工具: ATK-Logic V1.1.1.8_x64.exe (檔案太大無法上傳?)

感謝您
Austin

RE: CC3351: CC3351: 使用 Nuttx RTOS 點亮 BP-CC3351

Vivian Gao — Tue, 07 Apr 2026 03:49:20 GMT

未收到后续回复。

RE: CC3351: CC3351: 使用 Nuttx RTOS 點亮 BP-CC3351

Vivian Gao — Mon, 30 Mar 2026 05:05:04 GMT

我不确定这在基本层面上是如何运作的，所以我需要进一步调查。但是，我确实看到IRQ引脚很高，这可能会导致CARD-BUSY状态。IRQ表示需要读取core_status寄存器（0x0000BFFC）。
使用SDIO有什么具体原因吗？

RE: CC3351: CC3351: 使用 Nuttx RTOS 點亮 BP-CC3351

Lydia — Tue, 24 Mar 2026 08:58:10 GMT

您好，已经收到了您的案例，调查需要些时间，感谢您的耐心等待。

RE: AM2434: Does the AM2434+BP3351 development board combination support the sdio interface

Lydia — Mon, 09 Feb 2026 05:39:06 GMT

Hi,

Our previous recommendation for the customer would be to implement the SDIO interface themselves (something many customers have successfully done with their own hosts) for the AM243x while using jumper wires to connect the proper pins between the AM243x and BP CC33x1 and being aware of the supported voltage levels for the SDIO pins.

Another option (which we strongly recommend) would be for your customer to simply switch the product design to SPI, which is much easier integrate and set up between the AM243x and BP CC33x1. We also have guides for this to walk your customer through the process.

If your customer's only option is to use SDIO but is willing to use a different host to talk to the BP CC33x1, we highly recommend your customer to use a Linux MPU host.

Unfortunately, we currently cannot provide additional assistance (such as providing an SDIO example with the AM243x and BP CC33x1) without knowing more about your customer and your customer's goals.

AM2434: Does the AM2434+BP3351 development board combination support the sdio interface

Bill Gates — Wed, 21 Jan 2026 12:37:49 GMT

Part Number: AM2434

Does the LP-AM243 and CC3351 support the sdio interface in the RTOS system and can you provide an example of the code implementation of the sdio interface.I only found support for the SPI interface in the user guidance document, not for the SDIO interface.

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

Bill Gates — Tue, 20 Jan 2026 12:42:55 GMT

Part Number: AM2434

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.

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

Lydia — Fri, 06 Feb 2026 08:35:35 GMT

from top to bottom

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

Bill Gates — Fri, 06 Feb 2026 07:54:19 GMT

Can you resend the picture? The image cannot be loaded.

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

Lydia — Fri, 06 Feb 2026 07:23:23 GMT

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:

Along with above configurations, the pinmux is also configured seperately like below:

Please verify the correct pinmux configurations from the AM243 Datasheet as SDIO is not tested.

RE: AM2434: Does the AM2434+BP3351 development board combination support the sdio interface

Bill Gates — Fri, 06 Feb 2026 06:55:05 GMT

1. I am not sure about the detailed information of the customer, nor do I have their contact information. I did not directly communicate with the customer. Our company's business personnel directly communicate with the customer.
2. The customer's product design is based on the sdio interface, so the sdio interface is necessary for them to implement.

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

Bill Gates — Fri, 06 Feb 2026 06:13:51 GMT

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

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

Lydia — Fri, 06 Feb 2026 05:20:08 GMT

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.

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

Bill Gates — Fri, 06 Feb 2026 04:02:37 GMT

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

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

Bill Gates — Fri, 06 Feb 2026 03:58:49 GMT

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

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

Lydia — Thu, 05 Feb 2026 09:32:31 GMT

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.

RE: AM2434: Does the AM2434+BP3351 development board combination support the sdio interface

Lydia — Thu, 05 Feb 2026 09:14:57 GMT

Hi,

Like I previously mentioned, we do not have an example using the SDIO interface. We will not be providing SDIO implementation unless it is a feature that is absolutely necessary for your customer, and if there is strong reason from your customer that SPI cannot be used between these two devices.

If you look at the launchpads of the AM243 and the BP3351 and examine the pinouts, here is additional headwind for your customer: the pins do not line up! The customer will have to use jumper wires just to set up the right connections for the SDIO interface, and the customer also needs to verify the supported voltage levels for the SDIO pins.

Therefore, we strongly recommend using SPI to avoid all this headache.

Can you provide additional details on the following:

1. Who is your customer and what is the opportunity size?

2. Why is your customer adamant about using SDIO?

If there is additional confusion, we can set up a call with the customer.

Links for your reference:

https://www.ti.com/lit/ug/spruj12f/spruj12f.pdf (AM243x LP Guide)

https://www.ti.com/lit/ug/swau130a/swau130a.pdf (BP CC33x1 Guide)

Thank you.

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

Lydia — Wed, 04 Feb 2026 00:41:49 GMT

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

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

Bill Gates — Tue, 03 Feb 2026 12:30:37 GMT

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

RE: AM2434: Does the AM2434+BP3351 development board combination support the sdio interface

Bill Gates — Tue, 03 Feb 2026 12:02:06 GMT

If the sdio interface debugging is successful, it is possible to put AM243 and CC3551 into production.

RE: AM2434: Does the AM2434+BP3351 development board combination support the sdio interface

Bill Gates — Tue, 03 Feb 2026 12:01:35 GMT

1、 The customer is using the sdio interface of BP3551, not the SPI interface. But I don't know how to achieve it.

2、 Will purchase BP3351 and AM243

Does the LP-AM243 and CC3351 support the sdio interface in the RTOS system？

RE: AM2434: Does the AM2434+BP3351 development board combination support the sdio interface

Lydia — Fri, 30 Jan 2026 00:07:16 GMT

Clarifying question 2: Is the customer planning to go to production with the AM243 and the CC3551?

RE: AM2434: Does the AM2434+BP3351 development board combination support the sdio interface

Lydia — Thu, 29 Jan 2026 01:13:19 GMT

Hi,

Thank you for your follow-up question.

We currently do not have a code example for using the SDIO interface; in the picture you presented, the AM243 and CC33xx are connected in that manner to easily support the SPI interface as mentioned in the other thread I referenced.

1. What is the customer's use case in using SDIO, when we already present the SPI option?

2. Is the customer planning to purchase the AM243 in addition to the BP3551?

3. If the answer to question 2 is no, the customer will need to implement their own SDIO interface between the host MCU they are using and the BP3551.

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

Bill Gates — Tue, 27 Jan 2026 09:39:32 GMT

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.

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

Bill Gates — Tue, 27 Jan 2026 09:23:15 GMT

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