[En-Nut-Discussion] speed/frequency much too low for MediaNut 1.1 on Ethernut 2.1b

[llsoft at quantentunnel.de]

Hi,

I fixed the speed problem by myself.
The configuration was wrong.
It must be:

PLATFORM = "ETHERNUT2"
AVR_GCC = ""
MCU_ATMEGA128 = ""

NUTMEM_START = "0x100"
NUTMEM_RESERVED = "64"
NUTXMEM_SIZE = "28416"
NUTXMEM_START = "0x1100"
NUTBANK_COUNT = "30"
NUTBANK_START = "0x8000"
NUTBANK_SIZE = "0x4000"
NUTBANK_SR = "0xFF00"

SBBI0_SCK_PORT = "AVRPORTB"
SBBI0_SCK_BIT = "0"
SBBI0_MOSI_PORT = "AVRPORTB"
SBBI0_MOSI_BIT = "2"
SBBI0_MISO_PORT = "AVRPORTB"
SBBI0_MISO_BIT = "3"
SBBI0_CS1_PORT = "AVRPORTB"
SBBI0_CS1_BIT = "4"
SBBI0_RST1_PORT = "AVRPORTB"
SBBI0_RST1_BIT = "7"

SPPI0_CS1_AVRPORT = "AVRPORTB"
SPPI0_CS1_BIT = "4"
SPPI0_RST1_AVRPORT = "AVRPORTB"
SPPI0_RST1_BIT = "7"

AUDIO_VS1001K = ""
VS10XX_SIGNAL_IRQ = "INT6"
VS10XX_SCI_SBBI0_DEVICE = "1"
VS10XX_SDI_SPI0_DEVICE = "1"
VS10XX_BSYNC_PORT = "AVRPORTB"
VS10XX_BSYNC_BIT = "5"
VS10XX_HWRST_RECOVER = "4"
VS10XX_SWRST_RECOVER = "2"


The necessary change was:
SBBI0 for control (SCI)
SPPI0 for data (SDI)


Best regards,

Jan

> Hi,
> 
> I have a problem with the speed/frequency settings for the VS1001k.
> 
> Based on ethernut21b.conf I wrote a configuration for my MediaNut 1.1
> mounted on an Ethernut 2.1b. Then I compiled the nutpiper application
> with some minor changes (no DHCP, no EEPROM, no LCD). The application
> produces a much too slow sound.
> 
> The steps I did are:
> 
> 1.
> creating the configuration file 'ethernut21b-mn1.conf'
> (based on ethernut21b.conf):
> 
> PLATFORM = "ETHERNUT2"
> AVR_GCC = ""
> MCU_ATMEGA128 = ""
> SPPI0_CS1_AVRPORT = "AVRPORTB"
> SPPI0_CS1_BIT = "4"
> SPPI0_RST1_AVRPORT = "AVRPORTB"
> SPPI0_RST1_BIT = "7"
> NUTMEM_START = "0x100"
> NUTMEM_RESERVED = "64"
> NUTXMEM_SIZE = "28416"
> NUTXMEM_START = "0x1100"
> NUTBANK_COUNT = "30"
> NUTBANK_START = "0x8000"
> NUTBANK_SIZE = "0x4000"
> NUTBANK_SR = "0xFF00"
> AUDIO_VS1001K = ""
> VS10XX_SIGNAL_IRQ = "INT6"
> VS10XX_SCI_SPI0_DEVICE = "1"
> VS10XX_SDI_SPI0_DEVICE = "1"
> VS10XX_XCS_PORT = "AVRPORTB"
> VS10XX_XCS_BIT = "4"
> VS10XX_BSYNC_PORT = "AVRPORTB"
> VS10XX_BSYNC_BIT = "5"
> VS10XX_HWRST_RECOVER = "2"
> VS10XX_SWRST_RECOVER = "1"
> 
> 2.
> I applied the patch http://sourceforge.net/support/tracker.php?aid=3059633
> and changed line 61 of nutpiper/player.c from
> #include <dev/vs1001k.h>
> to
> #include <dev/vs10xx.h>
> 
> 3.
> calling nutconfigure with the configuration from 1.
> cd nutbld && make clean && make install
> 
> 4.
> cd nutpiper
> make
> 
> 5.
> I flashed the application and the beep and an audio stream can be heared.
> However, the sound is much too slow.
> 
> 6.
> I already checked the initialization sequence:
> The following code lines from VsPlayerReset(...) (vs10xx.c) are definitely
> compiled:
> 
> #if VS10XX_FREQ < 20000000UL
>     VsRegWrite(VS_CLOCKF_REG, (uint16_t)(VS_CF_DOUBLER | (VS10XX_FREQ /
> 2000UL)));
> #else
> ...
> #endif
> 
> #if defined(AUDIO_VS1001K)
>     /* Force frequency change (see datasheet). */
>     VsRegWrite(VS_INT_FCTLH_REG, 0x8008);
>     //VsRegRead(VS_CLOCKF_REG);
> #endif
> 
> 
> 
> My questions are now:
> 
> 1.
> What else can be the reason for the much to slow sound?
> What should I have to check for?
> 
> 2.
> I didn't find any notice in the VS1001 data-sheet about forcing the
> frequency change in a way which is used in vs10xx.c:
> #if defined(AUDIO_VS1001K)
>     /* Force frequency change (see datasheet). */
>     VsRegWrite(VS_INT_FCTLH_REG, 0x8008);
>     //VsRegRead(VS_CLOCKF_REG);
> #endif
> 
> Contrarily, it is written that INT_FCTLH must not be set
> (citation: "internal register, never use").
> 
> And on http://www.vlsi.fi/en/support/faq.html#c656 one can read the
> following:
> 
> ==== begin citation ====
> Symptom: Always wrong playback speed, but not exactly 1/3 of correct speed
> 
> If you are always getting consistently wrong playback speed, check if you
> have successfully written a correct value to the CLOCKF register by first
> writing to the register and then reading your value.
> ==== end citation ====
> 
> How do you interpret this?
> a) Reread the value to check if its correctly written?
> b) Rereading the value forces the frequency change?
> 
> 
> Best regards,
> 
> Jan

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