Function DSP_ReadPipeIfPossible

libctru/source/services/dsp.c:238–265

}

Result DSP_ReadPipeIfPossible(u32 channel, u32 peer, void* buffer, u16 length, u16* length_read)
{
	Result ret = 0;
	u32* cmdbuf = getThreadCommandBuffer();
	cmdbuf[0] = IPC_MakeHeader(0x10,3,0);
	cmdbuf[1] = channel;
	cmdbuf[2] = peer;
	cmdbuf[3] = length;

	u32 * staticbufs = getThreadStaticBuffers();

	u32 saved1 = staticbufs[0];
	u32 saved2 = staticbufs[1];

	staticbufs[0] = IPC_Desc_StaticBuffer(length,0);
	staticbufs[1] = (u32)buffer;

	ret = svcSendSyncRequest(dspHandle);

	staticbufs[0] = saved1;
	staticbufs[1] = saved2;

	if (R_FAILED(ret)) return ret;

	if (length_read)
		*length_read = cmdbuf[2] & 0xFFFF;
	return cmdbuf[1];
}

Result DSP_WriteProcessPipe(u32 channel, const void* buffer, u32 length)
{