topic Re: HDR exit pattern issue in MCX Microcontrollers

HDR exit pattern issue

yvan_yan — Tue, 31 Dec 2024 11:55:04 GMT

Hello,

I'm using the board as I3C master. I'm trying to send HDR exit pattern followed by stop like figure 1.

The MCTRL register's description says: I3C->MCTRL = I3C_MCTRL_REQUEST(6) ;

But actually it's like figure 2, is anything wrong with the config?

Thanks!

Figure 1

Figure 2

Re: HDR exit pattern issue

Harry_Zhang — Thu, 02 Jan 2025 10:48:46 GMT

Hi @yvan_yan

You can refer to this function.

void I3C_MasterEmitRequest(I3C_Type *base, i3c_bus_request_t masterReq) { uint32_t mctrlReg = base->MCTRL; mctrlReg &= ~I3C_MCTRL_REQUEST_MASK; if (masterReq == kI3C_RequestProcessDAA) { mctrlReg &= ~I3C_MCTRL_TYPE_MASK; } mctrlReg |= I3C_MCTRL_REQUEST(masterReq); base->MCTRL = mctrlReg; }

Harry

Re: HDR exit pattern issue

yvan_yan — Thu, 02 Jan 2025 11:00:38 GMT

yes, this is the function I use, but stop pattern seems not quite right, anything else needs to be configured?

I3C_MasterEmitRequest(base, kI3C_RequestForceExit);

Re: HDR exit pattern issue

Harry_Zhang — Tue, 07 Jan 2025 09:47:49 GMT

Hi @yvan_yan

I tested the i3c HDR examples with two frdm-mcxn947 boards.

The related codes are below.

The channel 0 is SDA, the channel 1 is SCL, the channel 2 is Toggle.

We can see that the I3C_MasterEmitRequest(base, kI3C_RequestForceExit) can work.

Harry

Re: HDR exit pattern issue

yvan_yan — Thu, 09 Jan 2025 06:22:09 GMT

Hi Harry

应该和我们接的target有关系，上面那个波形好像也可以检测到HDR exit + stop，感谢回复！

yvan_yan