How to control the AVB media steam volume size

[oyhp052]

OK, thank you , norman.

[oyhp052]

if you work on the low cost avb audio endpoint, we maybe going to help each other. I've done some modifications to test the volume with the remote button (unused for now) :

in xr_avb_demo.xc

void ptp_server_and_gpio
uncomment

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c <: REMOTE_SEL; 

void demo(...)
add in the beginning

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int volumes[4];

	for(int i=0;i<4;i++)
	{
		volumes[i]=0x40000000;
	}

add after

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case c_gpio_ctl :> int cmd:
			{
				switch (cmd)
				{

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case REMOTE_SEL:
					{
						int vol = 0;

						if (volumes[0]==0x40000000)
						{
							vol = 0x7FFFFFFF;
						}
						else if (volumes[0]==0x7FFFFFFF)
						{
							vol = 0;
						}
						else
						{
							vol = 0x40000000;
						}

						for(int i=0;i<4;i++)
						{
							volumes[i] = vol;
						}

						set_avb_source_volumes(0, volumes, 4);
					}
					break;

in media_output_fifo.c
after

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#define MAX_VOLUME

add

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#define MEDIA_OUTPUT_FIFO_VOLUME_CONTROL

Hi, norman . I have ​​some new discoveries of your way recently .
Also need to modify the following code section ：

in avb.h
add code
#define MEDIA_OUTPUT_FIFO_VOLUME_CONTROL

in avb_1722_listener.h
add code
#define MEDIA_OUTPUT_FIFO_VOLUME_CONTROL

then Run the demo project is successful .
However , when I debug the project , encounter a problem .
The program runs to c_io.h suspended ， see the picture (in my own project ,but it is the same as in DEMO).
How to use the "void set_avb_source_volumes(int sink_num, int volumes[], int count);" successfully and how to understand the c_io.h assembly code , please ?

[norman]

I met this error before ! but i don't remember for now what i've done. not helping ok....

You may have to look at which xc_abi_outint it stop by putting breakpoint in the caller "set_avb_source_volumes". then see which parameter is wrong between

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xc_abi_outuint(c, AVB1722_ADJUST_LISTENER_STREAM);
xc_abi_outuint(c, sink->stream.local_id);
xc_abi_outuint(c, AVB1722_ADJUST_LISTENER_VOLUME);
xc_abi_outuint(c, count);
for (int i=0;i<count;i++) {
xc_abi_outuint(c, volumes[i]);
}