path for mic

[Malcolm]

On 3/29/07, loux.thefuture <loux.thefuture at gmail.com> wrote:
> please find attached the patch for mic

Getting better

Index: linux-2.6.x/sound/arm/nds-sound.c
===================================================================
--- linux-2.6.x/sound/arm/nds-sound.c	(rÃ(c)vision 1696)
+++ linux-2.6.x/sound/arm/nds-sound.c	(copie de travail)
@@ -164,6 +164,7 @@
 	snd_pcm_runtime_t *runtime = substream->runtime;
 	runtime->hw = snd_nds_capture_hw;
 	// more hardware-initialization will be done here
+	nds_fifo_send(FIFO_MIC | FIFO_MIC_POWER | 1);
 	return 0;
 }

Need a few more changes here.

+#define TIMER_ENABLE    (1<<7)
+#define TIMER_DIV_1     (0)

Are these in arm7.h?

+void StartRecording(u8* buffer, int length) {

Rename MIC_Start.

FIFO commands will send buffer and length separately, so split into 3 functions.
I think ALSA expects the hardware to loop back to the start of the
buffer when it
reaches the end.

+  // Setup a 16kHz timer
+  REG_TM0CNT_L = 0xF7CF;

Replace magic number with a calculation.

+int StopRecording(void ) {

Rename MIC_Stop

+void  ProcessMicrophoneTimerIRQ(void ) {

Rename MIC_IRQ.

+    *microphone_buffer++ = MIC_ReadData() ^ 0x80;

How about
microphone_buffer[current_length++] = MIC_ReadData() ^ 0x80;

-- 
Malcolm Parsons