MPC5748G eDMA register configuration error

shifeiqian — Mon, 06 Jun 2016 15:59:54 GMT

Hi,

I have some problem when configuring eDMA register in MPC5748G.

The code "pDMA->SEEI.R = (vuint8_t)channel" will cause an error.

And then the project could not run normally.

The attachment is my project.

What mistake that I have made?

And what can be helpful to deal with it ?

Thanks!

Regards,

Qian

Original Attachment has been moved to: mpc5748g_Z4_1.zip

Re: MPC5748G eDMA register configuration error

martin_kovar — Tue, 07 Jun 2016 06:47:36 GMT

Hi Qian,

at first, you program crashed in this function:

void DMAMUX_HAL_Init(struct DMAMUX_tag *pDMAMUX)

{

int i;

for (i = 0; i < FSL_FEATURE_DMAMUX_MODULE_CHANNELS; i++)

{

pDMAMUX->CHCFG[i].R = (uint8_t)0;

}

You cannot initialize all 32 DMAMUX channels, because there are two peripherals and their address spaces are not linked.

DMAMUX0 channel 15 has address FFF6_C00F

DMAMUX1 channel 1 has address FFF6_C200

You have to change the pointer.

About problem you mention in your post, pDMA pointer has value NULL, so it can point everywhere. This is the root cause of the IVOR0 exception.

Regards,

Martin