IMX6uLL NO_SYS 裸跑 SDMA 寄存器 设置

[zhangtao]

官方SDK中SDMA驱动中，memory_to_memory的例子，如何将源地址设置为固定（FROZEN）,目标地址为递增，目前我修改的代码如下（fsl_sdma.c中的SDMA_LoadContext），

memset(context, 0, sizeof(sdma_context_data_t));

/* Set SDMA core's PC to the channel script address */
context->PC = config->scriptAddr;
 context->MSA = 0x10;
 context->MDA = 0x04;

修改完后，没有任何效果,请大家帮忙看看。

现在查到的资料为要用ldf和stf的汇编来修改，但是我觉得已经有C的API，应该不用再用汇编来设置了吧，很是迷茫

[zhangtao]

SDMA_InstallBDMemory  ？？？

[Rita_Wang]

I see that you have create two same thread, the values will be overwritten by the SDMA script,https://community.nxp.com/t5/i-MX-Processors/IMX6uLL-NO-SYS-SDMA-Register-Settings/m-p/1737253#M2138... Christian give the update to you there.

[zhangtao]

您好，

SDMA_PrepareTransfer(&transferConfig, 0x50000040, (uint32_t)destAddr, 4,
4, 4, 1024, 0, kSDMA_PeripheralTypeMemory,
kSDMA_MemoryToMemory);

这种设置方式时，是可以读到3次数据的（FPGA的FIFO），但是我传输的值为1024，理应读到1024个。

我也按英文帖子中的建议，将PC寄存器的位置从642改到了683，但是仍然没有效果，并且程序会卡死

[zhangtao]

When

config ->scriptAddr=FSL_ FEATURE_ SDMA_ M2M_ When using ADDR (642)

(the official default value),

my program can only read three identical values at once (what I want to achieve is to transfer 1024 bytes at a time,FPGA FIFO)

(read three identical values each time, which is another issue),

but setting config ->scriptAddr=FSL_ FEATURE_ SDMA_ P2M_ Where is the problem with ADDR (683) where no value can be read in destaddr?