MPC5746R eDMA register can't write or read

冠军蔡 — Wed, 29 Apr 2020 07:36:57 GMT

Dear,

I is debuging MPC5746R for DMA. But When I use S32DS debug MPC5746R, the DMA register cannot be written or read. The debuger is USB Multilink Universal.

code:

DMA_0.TCD[7].WORD_1.B.SMOD = 0;
DMA_0.TCD[7].WORD_1.B.SSIZE = 0x2; /* 32-bit */
DMA_0.TCD[7].WORD_1.B.DMOD = 0;
DMA_0.TCD[7].WORD_1.B.DSIZE = 0x2; /* 32-bit */
DMA_0.TCD[7].WORD_1.B.SOFF = 0x4; //Source address signed offset
DMA_0.TCD[7].WORD_2.NBYTES.B.NBYTES = 64; /* Minor Byte Transfer Count (16x32-bits)/8=64byte */
DMA_0.TCD[7].WORD_3.B.SLAST = -64;
DMA_0.TCD[7].WORD_4.B.DADDR = (uint32)&DMA_save_result0;
DMA_0.TCD[7].WORD_5.B.CITER_E_LINK = 0; //The channel-to-channel linking is disabled
//DMA_0.TCD[0].WORD_5.B.LINKCH_CITER = 0;
DMA_0.TCD[7].WORD_5.B.CITER = 1;
DMA_0.TCD[7].WORD_5.B.DOFF = 0x4; //Destination address signed offset
DMA_0.TCD[7].WORD_6.B.DLAST_SGA= -64;
DMA_0.TCD[7].WORD_7.B.BITER = 1; //
DMA_0.TCD[7].WORD_7.B.BITER_E_LINK = 0; //0=The channel-to-channel linking is disabled
//DMA_0.TCD[0].WORD_7.B.BITER_BITER_LINKCH = 0;
DMA_0.TCD[7].WORD_7.B.BWC = 0;
DMA_0.TCD[7].WORD_7.B.MAJOR_LINKCH = 1; /* Link to channel 1 */
DMA_0.TCD[7].WORD_7.B.MAJOR_E_LINK = 1; /* Enable channel linking */
DMA_0.TCD[7].WORD_7.B.E_SG = 0;
DMA_0.TCD[7].WORD_7.B.DREQ = 0;
DMA_0.TCD[7].WORD_7.B.INT_HALF = 0;
DMA_0.TCD[7].WORD_7.B.INT_MAJOR = 0;

Error:

MPC574xR Device detected.
Unable to go into background mode.

PE-ERROR: Warning. Can't read registers while part is running.
PE-ERROR: Warning. Can't read memory while part is running. @0 (4 bytes)
PE-ERROR: Warning. Can't read memory while part is running. @0 (4 bytes)

I try to access DMA_0 register other Byte,the result is same.

why can't access DMA_0 register,i need help

Kind regards,

CGJ

Re: MPC5746R eDMA register can't write or read

petervlna — Mon, 04 May 2020 05:17:22 GMT

Hi,

The debugger is telling you that in order to change register values, your code cannot run.

Stop the code and then change the values.

Or use debugger which is capable of this operation.

regards,

Peter

Re: MPC5746R eDMA register can't write or read

vegetarian1 — Wed, 23 Dec 2020 14:52:53 GMT

Hi, @冠军蔡

How do you solve this problem? I encounter a similar problem.

Thanks.

topic Re: MPC5746R eDMA register can't write or read in MPC5xxx

MPC5746R eDMA register can't write or read

Re: MPC5746R eDMA register can't write or read

Re: MPC5746R eDMA register can't write or read