On Mon, Apr 22, 2013 at 5:30 PM, [email protected] <[email protected]>wrote:
>
>
>
> On Mon, Apr 22, 2013 at 4:49 PM, Andreas Fritiofson <
> [email protected]> wrote:
>
>> On Mon, Apr 22, 2013 at 9:22 PM, [email protected]
>> <[email protected]>wrote:
>>
>>> We're designing a new board that uses a MIPS based RT5350. The RT5350
>>> doesn't have any ADC support so the idea is to also add a Cortex-M0 on the
>>> board. The Cortex would look like an I2C device to the MIPS CPU.
>>>
>>> The MIPS CPU can be initialized via JTAG and it runs Linux. So is it
>>> feasible to run OpenOCD on the MIPS then bit bang SWD over some GPIO to
>>> initially program the flash on the Cortex?
>>>
>>> This is my first SWD design so I'm still figuring things out.
>>>
>>>
>> That sounds extremely complex, considering for one thing that OpenOCD
>> doesn't even officially support SWD yet.
>>
>> I think you would be better off selecting a Cortex-Mx µC that includes a
>> boot loader in ROM. I think most do. At least I know that many, if not all,
>> ST devices do. They can be programmed over a simple UART protocol, or some
>> even via USB or CAN.
>>
>> Since you still need JTAG for the MIPS you could also pick an only
>> slightly more expensive Cortex with JTAG and connect it in the chain. For
>> field upgrades you could still want to have a boot loader on the Cortex, of
>> course.
>>
>
> We use the LPC3130 on another board that has the ROM bootloader over UART
> feature.
>
> I was looking for something with JTAG or UART boot and I haven't
> identified one in the $2.00 range. Maybe a STM32F051K4U6? I'll check out
> the datasheet.
>
This board is targeted at hobbyists so I want them to be able to reload the
software without needing special hardware.
Thanks for the tip. I do like those UART boot loaders. STM32F051K4U6
supports one. I had been looking at Freescale and Nordic Cortex chips which
do not have the UART boot ROM.
http://www.st.com/st-web-ui/static/active/en/resource/technical/document/application_note/CD00264342.pdf
The RT5350 has a UART on it we were leaving open for customer use. Should
be possible to jumper it onto the STM32 UART. Maybe I can get create with
pin select and not need jumpers.
--
Jon Smirl
[email protected]
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