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iPod Nano 2G: Fix I2S clocking. All sampling rates should work now.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28581 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sparmann 2010-11-14 04:46:38 +00:00
parent 23fd886c4f
commit b491421c5a
1 changed files with 15 additions and 19 deletions
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34
firmware/target/arm/s5l8700/pcm-s5l8700.c
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@ -51,17 +51,18 @@ static const struct div_entry {
int pdiv, mdiv, sdiv, cdiv;
} div_table[HW_NUM_FREQ] = {
#ifdef IPOD_NANO2G
[HW_FREQ_11] = { 2, 41, 5, 4},
[HW_FREQ_22] = { 2, 41, 4, 4},
[HW_FREQ_44] = { 2, 41, 3, 4},
[HW_FREQ_88] = { 2, 41, 2, 4},
[HW_FREQ_8 ] = { 2, 12, 3, 9},
[HW_FREQ_16] = { 2, 12, 2, 9},
[HW_FREQ_32] = { 2, 12, 1, 9},
[HW_FREQ_12] = { 2, 12, 4, 3},
[HW_FREQ_24] = { 2, 12, 3, 3},
[HW_FREQ_48] = { 2, 12, 2, 3},
[HW_FREQ_96] = { 2, 12, 1, 3},
[HW_FREQ_11] = { 0, 41, 3, 8},
[HW_FREQ_22] = { 0, 41, 3, 4},
[HW_FREQ_44] = { 0, 41, 3, 2},
[HW_FREQ_88] = { 0, 41, 3, 1},
[HW_FREQ_8 ] = { 0, 2, 1, 9},
[HW_FREQ_16] = { 0, 2, 0, 9},
[HW_FREQ_32] = { 2, 2, 0, 9},
[HW_FREQ_64] = { 6, 2, 0, 9},
[HW_FREQ_12] = { 0, 2, 2, 3},
[HW_FREQ_24] = { 0, 2, 1, 3},
[HW_FREQ_48] = { 0, 2, 0, 3},
[HW_FREQ_96] = { 2, 2, 0, 3},
#else
/* table of recommended PLL/MCLK dividers for mode 256Fs from the datasheet */
[HW_FREQ_11] = { 26, 189, 3, 8},
@ -173,19 +174,14 @@ static void pcm_dma_set_freq(enum hw_freq_indexes idx)
{
struct div_entry div = div_table[idx];
PLLCON &= ~4;
PLLCON &= ~0x10;
PLLCON &= 0x3f;
PLLCON |= 4;
/* configure PLL1 and MCLK for the desired sample rate */
PLL1PMS = (div.pdiv << 16) |
(div.mdiv << 8) |
(div.sdiv << 0);
PLL1LCNT = 7500; /* no idea what to put here */
PLL1LCNT = 280; /* 150 microseconds */
/* enable PLL1 and wait for lock */
PLLCON |= (1 << 1);
PLLCON |= 1 << 1;
while ((PLLLOCK & (1 << 1)) == 0);
/* configure MCLK */
@ -234,7 +230,7 @@ void pcm_play_dma_init(void)
(0 << 13) | /* 0 = basic I2S format */
(0 << 12) | /* 0 = MSB first */
(0 << 11) | /* 0 = left channel for low polarity */
(5 << 8) | /* MCLK divider */
(3 << 8) | /* MCLK divider */
(0 << 5) | /* 0 = 16-bit */
(2 << 3) | /* bit clock per frame */
(1 << 0); /* channel index */