MSPM0L1304: Is BSL invoked when NRST pin is disabled?

H Sal Ye.

Sal Ye said:

However, when NRST is not used, how is the host to reset the M0 device through signal?

If the NRST is disabled, can't M0 be reset?

The host will uses hardware BSL invoke.

It makes BSL entry sequence using the NRST and PA18 signal using the bsl_host_mcu_i2c example.

We don't think to use software BSL invoke.

Hi SY,

SY Yoon said:

The NRST pin is disabled by application. 

If you disable the NRST pin, then how can you using NRST to reset M0 device? You should use other way to reset M0 device, and then if you BSL invoked, M0 will entry BSl mode,

B.R.

Sal

Hi, Sal Ye,

My customer uses I2C to communicate with the AP.

He will also use the I2C BSL for firmware download.

However, I2C will not work unless the NRST pin is disabled.

Is there a way to use I2C without disabling the NRST pin?

HI SY,

Yes, it can work with NRST pin, which I mentioned previous:

Sal Ye said:

One workaround about it, use software BSL invoke. The details can refer to TRM.

Use software BSL invoke, then the device will restart and run BSL code.

B.R.

Sal