TMS320F28069: SCI boot mode

SHIJOMON THOMAS

Hi,

We are implementing firmware upgrade for piccolo-C2000(TMS320F2806M) microcontroller. In our system, piccolo is connected to another micocontroller (MSP432) through UART. we are using SCI-A for communication between the piccolo and MSP432. Our plan is to upgrade the piccolo using the SCI boot mode from the MSP432 whenever a firmware upgrade is required. In normal working both the
controllers will communicate using a packet format defined by us.

The boot mode selection GPIO of the piccolo are connected as follows(permanent connection, no switches used).

GPIO37 TDO - High
GPIO34 - High
TRST - Low

As per this configuration, Stand-Alone Boot Mode is GetMode. So the OTP_KEY and OTP_BMODE register values are checked for getting the boot mode. If we program the OTP with OTP_KEY = 0x005A and OTP_BMODE = 0x0001, the boot mode will be SCI boot mode. Our understanding is clear till this point. We need some clarity regarding the below points.

1. If we program the OTP_BMODE with 0x0001 for enabling the firmware upgrade using SCI boot mode, after upgrade can we change the OTP_BMODE to 0x000B for booting from flash in normal operation?

2. If we can not change the OTP_BMODE to 0x000B(GetMode: Flash) once it is programmed with OTP_BMODE to 0x0001(GetMode: SCI), How can we execute the normal application after firmware upgrade. As per my understanding SCI boot mode will entered after every reset. How to exit from the SCI boot mode?

3. Whether we need to load the flash kernal for flash programming?

Regards,

Shijo Thomas

over 4 years ago

0 Baskaran Chidambaram over 4 years ago

TI__Genius 17370 points

you can't change the OTP value multiple times.

You need to keep the default configuration as flash boot and in the application decide if you want to perform firmware upgrade. but you can't reset the device at this point. which means you need to include the flash kernel for flash programming as part of your application itself.

0 SHIJOMON THOMAS over 4 years ago in reply to Baskaran Chidambaram

Intellectual 445 points

Hi Baskaran,

Thanks for the reply.

I didn't completely understand the suggestion.

1. You meant that, we cannot use the SCI boot mode in this case?

2. We need to develop our own firmware upgrade mechanism.?

3. Is there any way to jump to application if boot up in SCI boot mode?

Regards,

Shijo Thomas

0 Baskaran Chidambaram over 4 years ago

TI__Genius 17370 points

1. You typically want the boot to come to flash to boot your application. To enter sci boot you need to drive the pins to select sci boot mode. if that is not possible you cant use SCI boot mode

2. yes, you need to include firmware upgrade code as part of your application

3. typically no. But if you pass invalid header in SCI packet the flash boot mode will be entered (refer figure 2-13 of TRM).

0 SHIJOMON THOMAS over 4 years ago in reply to Baskaran Chidambaram

Intellectual 445 points

Thanks Baskaran for the reply

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28069: SCI boot mode