CC2340R5: Problem about using ROM serial bootloader over SPI interface

Weiting Liao

Prodigy 60 points

Part Number: CC2340R5

Tool/software:

Hi TI Support Team,

I am planning to flash the CC2340 using the ROM serial bootloader over the SPI interface.

My setup includes two CC2340 MCUs: one acting as the host and the other as the slave.

According to TRM section 8.5, I have configured the SPI format with SPH set to 1, SPO set to 1, and a bit rate of 100k.

Additionally, I have set a host GPIO as an output to pull down the slave's DIO21, ensuring it enters bootloader mode.

The host sends the ping command (0x03 0x20 0x20) to the slave. However, I am unsure how to receive an acknowledgment from the slave.

I attempted to send a 512-byte SPI packet (including the ping command) to the slave, but I did not receive any acknowledgment data on MISO.

Could you provide guidance on properly using the ROM serial bootloader over SPI?

Thank you for your support.

7 months ago

0 Weiting Liao 7 months ago

Prodigy 60 points

Here is my host SPI setting:

SPI_Params_init(&spiParams);

spiParams.frameFormat = SPI_POL1_PHA1;

spiParams.mode = SPI_CONTROLLER;

spiParams.bitRate = 100000;

spi_handle = SPI_open(CONFIG_SPI_0, &spiParams);

The right G5C board is the slave.

0 Toby 7 months ago in reply to Weiting Liao

TI__Mastermind 35000 points

Hi,

To confirm, which exact DIOs are you using for the SBL device side?
This should match one of the options from the TRM:
"Table 8-38. Configuration of Serial Interfaces" of https://www.ti.com/lit/ug/swcu193a/swcu193a.pdf?ts=1739376900324&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FCC2340R5

Additionally, have you already considered the "The delayed configuration of the TX pin imposes special consideration on an SPI controller device regarding the transfer of the first byte of the first packet (see Section 8.5.1.2.2). " ?

Thanks,
Toby

0 Weiting Liao 7 months ago in reply to Toby

Prodigy 60 points

Hi Toby,

I found the rootcause of the SPI operation problem.

The serialIoCfgIndex setting of this CC2340 launchpad is 2 not 0,which the spi clock pin is DIO24.
I connected the spi clock to the right pin,and the host could receive the ACK from the slave.

0 Toby 7 months ago in reply to Weiting Liao

TI__Mastermind 35000 points

Thanks for confirming! Glad to hear you resolved the issue.

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CC2340R5: Problem about using ROM serial bootloader over SPI interface