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Subject: Re: Ladies and gentlemen, we have sound on the RCA RC3000A digital boombox

Re: Ladies and gentlemen, we have sound on the RCA RC3000A digital boombox

From: Rafaël Carré <>
Date: Sat, 20 Apr 2013 21:05:52 +0200

Congrats Boris!

More work on SD drivers would be nice I guess, perhaps soon we'll be
able to rip off SD drivers straight from Linux kernel :)

Le 20/04/2013 20:50, Boris Gjenero a écrit :
> Over the last few weeks I've been working on a port to the RCA RC3000A
> digital boombox. I now have flawless playback, including via the
> speakers. The first successfully played song was Mika - Un Soleil Mal
> Luné in FLAC format, from an SD card.
> It's based on the TCC760 SoC, which has a USB boot mode allowing
> convenient development without risk of bricking or need to write code to
> storage. The mode is a bit different from later Telechips SoC supported
> by tcctool: the 4th parameter is execution starting address not SDCFG. I
> can still upload to SDRAM by first uploading a small program to set
> SDCFG and then uploading to SDRAM.
> Rockbox has drivers for the LCD, tuner and RTC. The LCD only needs a
> different initialization sequence. The SoC has similarities to TCC77x
> and the codec has similarities to CS42L55, but there are important
> differences, so I'm making new drivers for them. I used Archos Ondio
> ata_mmc.c as a starting point for the SD driver because it also uses
> SPI, but it seems I should be using higher level SD code from another
> later driver for SD cards. It's too bad that SD drivers don't separate
> low level communication with the card from higher level code that sends
> commands, like with ATA. I intend to keep the two separate in the SD
> driver, perhaps with an eventual goal of splitting other drivers that
> way. I'm not planning to use the OHCI USB host controller for storage
> access, but the Telechips USB device controller seems easy and I should
> be able to use that for Rockbox USB.
> Here's a summary of what the RCA RC3000A contains
> CPU: Telechips TCC760 SoC with ARM940T core, which the OF runs at 96 MHz
> Memory: 2 MB SDRAM, 2 MB NOR flash with over 1 MB free
> LCD: SSD1815, 128x64, 1bpp, white backlight
> Storage: 512 MB internal NAND flash, SD card slot with SPI mode access
> using GSIO, OHCI USB host port.
> Tuner: TEA5767 radio module with 32767 Hz crystal
> CODEC: CS42L51 with radio connected to AIN1 and line in to AIN2, the
> output driving headphones, and a separate class D amplifier chip driving
> the speakers.
> RTC: PCF8563
> Best regards,
> Boris
Received on 2013-04-20

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