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Subject: Re: Sansa radio driver (AS5314 help

Re: Sansa radio driver (AS5314 help

From: Ivan Zupan <>
Date: Tue, 15 May 2007 16:38:24 -0800

I have tried those, but they are pretty much what Mr.H described.
Interestingly enough, he mentioned clearing bit 11 at 0x70000020 (no
effect on the radio whatsoever by the way). This address appears to be
DEV_INIT. Since all the hardware uses DEV_EN/DEV_INIT/DEV_RS, maybe the
radio is not enabled at all? Do you see any references to the above
right before GPIOH is used? It may be used to unmute the line1 in via
some hardware switch...

Antonius Hellmann wrote:
> I ran the sansa emulator into the radio menu. This is the result:
> Directly after entering the radio menu the sansa emulator does a lot
> of accesses to the GPIO-H registers.
> Probably this can give a hint, how to configure the output? But it may
> be only relevant for detecting the radio hardware.
> R1=read one byte, W1=write one byte
> 711186e 0000e90c CPU GPO_H_VAL 6000d0ac R1-00000000
> 7111870 0000e914 CPU GPO_H_VAL 6000d0ac W1-00000010
> 7111872 0000e91c CPU GPO_H_ENB 6000d09c R1-0000001e
> 7111874 0000e924 CPU GPO_H_ENB 6000d09c W1-0000001e
> 7111876 0000e92c CPU GP_H_ENB 6000d08c R1-000000de
> 7111878 0000e934 CPU GP_H_ENB 6000d08c W1-000000de
> 7111879 0000e938 CPU GPO_H_ENB 6000d09c R1-0000001e
> 711187b 0000e940 CPU GPO_H_ENB 6000d09c W1-0000001e
> 711187c 0000e944 CPU GP_H_ENB 6000d08c R1-000000de
> 711187e 0000e94c CPU GP_H_ENB 6000d08c W1-000000fe
> 711187f 0000e950 CPU GPO_H_VAL 6000d0ac R1-00000010
> 7111881 0000e958 CPU GPO_H_VAL 6000d0ac W1-00000010
> 7111882 0000e95c CPU GPO_H_ENB 6000d09c R1-0000001e
> 7111884 0000e964 CPU GPO_H_ENB 6000d09c W1-0000001e
> 7111885 0000e968 CPU GP_H_ENB 6000d08c R1-000000fe
> 7111887 0000e970 CPU GP_H_ENB 6000d08c W1-000000fe
> 71119a9 0000ea60 CPU GPO_H_VAL 6000d0ac R1-00000010
> 71119ac 0000ea6c CPU GPO_H_VAL 6000d0ac W1-00000018
> 71119ae 0000ea74 CPU GPO_H_ENB 6000d09c R1-0000001e
> 71119b0 0000ea7c CPU GPO_H_ENB 6000d09c W1-0000003e
> repeating
> 71119c7 0000ea04 CPU GPO_H_VAL 6000d0ac R1-00000018
> 71119c9 0000ea0c CPU GPO_H_VAL 6000d0ac W1-00000008
> 71119ca 0000ea10 CPU GPO_H_VAL 6000d0ac R1-00000008
> 71119ce 0000ea20 CPU GPO_H_VAL 6000d0ac W1-00000028
> 71119df 0000ea2c CPU GPO_H_VAL 6000d0ac R1-00000028
> 71119e1 0000ea34 CPU GPO_H_VAL 6000d0ac W1-00000038
> ----- Original Message ----- From: "Ivan Zupan" <>
> To: "Rockbox development" <>
> Sent: Tuesday, May 15, 2007 6:57 AM
> Subject: Re: Sansa radio driver (AS5314 help
>> >
>>> You could try Toni's emulator, maybe this gives some hint's about
>>> GPIO ports or memory addresses, but i don't know how much the
>>> emulator works with the radio part of the OF.
>> Maybe someone with a better understanding of it can look over that
>> part? I could not even get it past the bootloader...
>> In terms of progress, all that works so far is detecting if the
>> station is mono/stereo, getting the chip id, and station signal
>> strength. I have also made it generate an interrupt for what it's
>> worth. However, there are some things which need to be figured out,
>> such as the algorithm for tuning. It involves calculations from 3
>> registers, FM_OSC, IF_OSC and FM_CAP and a bunch of math intensive
>> operations. It also requires you to measure with an internal counter
>> and write the result to another register. Interestingly enough, they
>> ask that a register be set to 65% of the value of another, but there
>> is no reference to floating point or rounding?!
Received on 2007-05-16

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