merge a big part of the unofficial gigabeat cvs back. Includes working bootloader and rockbox with audio.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11850 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 347 insertions, 0 deletions

diff --git a/firmware/target/arm/gigabeat/meg-fx/pcm-meg-fx.c b/firmware/target/arm/gigabeat/meg-fx/pcm-meg-fx.c
new file mode 100644
index 0000000000..a3c09c5c64
--- /dev/null
+++ b/firmware/target/arm/gigabeat/meg-fx/pcm-meg-fx.c
@@ -0,0 +1,347 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 by Michael Sevakis
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "system.h"
+#include "kernel.h"
+#include "logf.h"
+#include "audio.h"
+#include "wm8975.h"
+#include "file.h"
+
+static int pcm_freq = HW_SAMPR_DEFAULT; /* 44.1 is default */
+
+#define FIFO_COUNT ((IISFCON >> 6) & 0x01F)
+
+/* number of bytes in FIFO */
+#define IIS_FIFO_SIZE 64
+
+/* Setup for the DMA controller */
+#define DMA_CONTROL_SETUP  ((1<<31) | (1<<29) | (1<<23) | (1<<22) | (1<<20))
+
+unsigned short * p;
+size_t p_size;
+
+
+
+/* DMA count has hit zero - no more data */
+/* Get more data from the callback and top off the FIFO */
+//void fiq(void) __attribute__ ((interrupt ("naked")));
+void fiq(void) ICODE_ATTR __attribute__ ((interrupt ("FIQ")));
+void fiq(void)
+{
+    /* clear any pending interrupt */
+    SRCPND = (1<<19);
+
+    /* Buffer empty.  Try to get more. */
+    if (pcm_callback_for_more) 
+    {
+        pcm_callback_for_more((unsigned char**)&p, &p_size);
+    }
+    else 
+    {
+        /* callback func is missing? */
+        pcm_play_dma_stop();
+        return;
+    }
+
+    if (p_size)
+    {
+        /* set the new DMA values */
+        DCON2 = DMA_CONTROL_SETUP | (p_size >> 1);
+        DISRC2 = (int)p + 0x30000000;
+
+        /* Re-Activate the channel */
+        DMASKTRIG2 = 0x2; 
+    }
+    else
+    {
+        /* No more DMA to do */
+        pcm_play_dma_stop();
+    }
+        
+}
+
+
+
+void pcm_init(void)
+{
+    pcm_playing = false;
+    pcm_paused = false;
+    pcm_callback_for_more = NULL;
+    
+    audiohw_init();
+    audiohw_enable_output(true);
+    audiohw_mute(true);
+
+    /* cannot use the WM8975 defaults since our clock is not the same */
+    /* the input master clock is 16.9344MHz - we can divide exact for that */
+    audiohw_set_sample_rate( (0<<6) | (0x11 << 1) | (0<<0));
+
+    /* init GPIO */
+    GPCCON = (GPCCON & ~(3<<14)) | (1<<14);
+    GPCDAT |= 1<<7;
+    GPECON |= 0x2aa;
+
+    /* Do no service DMA0 requests, yet */
+    /* clear any pending int and mask it */
+    INTMSK |= (1<<19);      /* mask the interrupt */
+    SRCPND = (1<<19);       /* clear any pending interrupts */
+    INTMOD |= (1<<19);      /* connect to FIQ */
+
+}
+
+
+
+void pcm_play_dma_start(const void *addr, size_t size)
+{
+    //FIXME
+    //return;
+
+    int i;
+    
+    /* sanity check: bad pointer or too small file */
+    if ((NULL == addr) || (size & ~1) <= IIS_FIFO_SIZE) return;
+
+    p = (unsigned short *)addr;
+    p_size = size;
+
+
+    /* Enable the IIS clock */
+    CLKCON |= (1<<17);  
+
+    /* IIS interface setup and set to idle */
+    IISCON = (1<<5) | (1<<3);
+
+    /* slave, transmit mode, 16 bit samples - 384fs - use 16.9344Mhz */ 
+    IISMOD = (1<<9) | (1<<8) | (2<<6) | (1<<3) | (1<<2);
+
+    /* connect DMA to the FIFO and enable the FIFO */
+    IISFCON = (1<<15) | (1<<13);
+
+    /* prefill the FIFO with half words */
+    for (i=0; i < IIS_FIFO_SIZE; i+=2)
+    {
+        IISFIFO = *p++;
+        p_size -= 2;
+    }
+
+    /* set DMA dest */
+    DIDST2 = (int)&IISFIFO; 
+
+    /* IIS is on the APB bus, INT when TC reaches 0, fixed dest addr */
+    DIDSTC2 = 0x03;
+    
+    /* How many transfers to make - we transfer half-word at a time = 2 bytes */
+    /* DMA control: CURR_TC int, single service mode, I2SSDO int, HW trig */
+    /*     no auto-reload, half-word (16bit) */
+    DCON2 = DMA_CONTROL_SETUP | (p_size / 2);
+
+    /* set DMA source and options */
+    DISRC2 = (int)p + 0x30000000;
+    DISRCC2 = 0x00;  /* memory is on AHB bus, increment addresses */
+
+    /* clear pending DMA interrupt */
+    SRCPND = 1<<19;
+
+    enable_fiq(fiq);
+
+    /* unmask the DMA interrupt */
+    INTMSK &= ~(1<<19);
+
+    /* Activate the channel */
+    DMASKTRIG2 = 0x2;
+    
+    /* turn off the idle */
+    IISCON &= ~(1<<3);
+
+    pcm_playing = true;
+
+    /* start the IIS */
+    IISCON |= (1<<0);
+
+}
+
+
+
+/* Disconnect the DMA and wait for the FIFO to clear */
+void pcm_play_dma_stop(void)
+{
+    pcm_playing = false;
+
+    /* mask the DMA interrupt */
+    INTMSK |= (1<<19);
+
+    /* De-Activate the channel */
+    DMASKTRIG2 = 0x4;
+
+    /* idle the IIS transmit */
+    IISCON |= (1<<3);
+
+    /* stop the IIS interface */
+    IISCON &= ~(1<<0);
+
+    /* Disconnect the IIS IIS clock */
+    CLKCON &= ~(1<<17);  
+
+
+    disable_fiq();
+
+}
+
+
+
+void pcm_play_pause_pause(void)
+{
+    /* idle */
+    IISCON |= (1<<3);
+}
+
+
+
+void pcm_play_pause_unpause(void)
+{
+    /* no idle */
+    IISCON &= ~(1<<3);
+}
+
+
+
+void pcm_set_frequency(unsigned int frequency)
+{
+    int sr_ctrl;
+
+    switch(frequency)
+    {
+        case SAMPR_11:
+            sr_ctrl = 0x19 << 1;
+            break;
+        case SAMPR_22:
+            sr_ctrl = 0x1B << 1;
+            break;
+        default:
+        case SAMPR_44:
+            sr_ctrl = 0x11 << 1;
+            break;
+        case SAMPR_88:
+            sr_ctrl = 0x1F << 1;
+            break;
+    }
+    audiohw_set_sample_rate(sr_ctrl);
+    pcm_freq = frequency;
+}
+
+
+
+size_t pcm_get_bytes_waiting(void)
+{
+    return (DSTAT2 & 0xFFFFF) * 2;
+}
+
+
+
+/* dummy functions for those not actually supporting all this yet */
+void pcm_apply_settings(bool reset)
+{
+    (void)reset;
+}
+
+void pcm_set_monitor(int monitor)
+{
+    (void)monitor;
+}
+/** **/
+
+void pcm_mute(bool mute)
+{
+    audiohw_mute(mute);
+    if (mute)
+        sleep(HZ/16);
+}
+
+/*
+ * This function goes directly into the DMA buffer to calculate the left and
+ * right peak values. To avoid missing peaks it tries to look forward two full
+ * peek periods (2/HZ sec, 100% overlap), although it's always possible that
+ * the entire period will not be visible. To reduce CPU load it only looks at
+ * every third sample, and this can be reduced even further if needed (even
+ * every tenth sample would still be pretty accurate).
+ */
+
+/* Check for a peak every PEAK_STRIDE samples */
+#define PEAK_STRIDE   3
+/* Up to 1/50th of a second of audio for peak calculation */
+/* This should use NATIVE_FREQUENCY, or eventually an adjustable freq. value */
+#define PEAK_SAMPLES  (44100/50)
+void pcm_calculate_peaks(int *left, int *right)
+{
+    short *addr;
+    short *end;
+    {
+        size_t samples = p_size / 4;
+        addr = p;
+
+        if (samples > PEAK_SAMPLES)
+            samples = PEAK_SAMPLES - (PEAK_STRIDE - 1);
+        else
+            samples -= MIN(PEAK_STRIDE - 1, samples);
+
+        end = &addr[samples * 2];
+    }
+
+    if (left && right) {
+        int left_peak = 0, right_peak = 0;
+
+        while (addr < end) {
+            int value;
+            if ((value = addr [0]) > left_peak)
+                left_peak = value;
+            else if (-value > left_peak)
+                left_peak = -value;
+
+            if ((value = addr [PEAK_STRIDE | 1]) > right_peak)
+                right_peak = value;
+            else if (-value > right_peak)
+                right_peak = -value;
+
+            addr = &addr[PEAK_STRIDE * 2];
+        }
+
+        *left = left_peak;
+        *right = right_peak;
+    }
+    else if (left || right) {
+        int peak_value = 0, value;
+
+        if (right)
+            addr += (PEAK_STRIDE | 1);
+
+        while (addr < end) {
+            if ((value = addr [0]) > peak_value)
+                peak_value = value;
+            else if (-value > peak_value)
+                peak_value = -value;
+
+            addr += PEAK_STRIDE * 2;
+        }
+
+        if (left)
+            *left = peak_value;
+        else
+            *right = peak_value;
+    }
+}