AM5728 MCASP1-TI中文支持网

hi,I want to know if there are some demo about how to use the AM5728`s mcasp1 or mcasp2?

And now I had forrowed the guide and step by step for interfacing an audio DAC to the McASP on AM728 devices. and run ok.

Sitara Linux Software Developer's Guide → Sitara Linux SDK → Audio: DAC Example

http://processors.wiki.ti.com/index.php?title=Sitara_Linux_Audio_DAC_Example&keyMatch=mcasp&tisearch=Search-EN

but when I try to use the MCASP1 or MCASP2 to transmit some data(not audio data,just usual pcm data). I found there some problem block me.

my step is:

1、follow the guide finish the dummy audio driver.

2、use the alsa-lib/test/pcm_min to transmit some data. the code as follow:

(figure 1)

3、then use the LA5061 Logic Analyzer to catch the output, as the following:

(figure 2)

the analyzer conectting and setting is:

channel0: DATA

channel14:FRAME

channel15:ACLK

now, my puzzle is:

1、look at the figuer 2.

why the DATA output is 0x0001 0x0001 0x0201 0x0201 0x0401 0x0401…?

and i used "omapconf dump mcasp1" when running ./pcm_min , the reg. value as figuer 3.

2、why the channel 1 and channel 5 have signal output?

3、how to transmit the data using all of the 16 channels of the McASP1? if there are some demo or user guide for me.

thanks.

回复 Jian Zhou:

您好，谢谢您的关注和回复。

请问

1、mcasp1的16个通道传输数据是简单的并行模式发送和接收的吗？

2、主要是修改XFMT寄存器配置格式化输出是吧？

回复 Jian Zhou:

我今天配置了一下XFMT和TXFMCTL。输出的情况如下图

请问一下您这边有没有关于MCASP1使用的更详细和具体的文档资料呢？或者demo。

回复 michael ye:

还有我的DT配置如下

AM5728 MCASP1