Thank you Miklos. This solves my problem with the SPI bus.
Basically I want to get an estimate of the noise floor. Therefore, I am
trying to force the RF230 to give me an estimate of the RF energy on the
current channel even if there are no packets being received. The datasheet
(page 41) mentions that this can be done by writing an arbitrary value to
PHY_ED_LEVEL register, waiting for 140uS and then reading the register given
that the chip is in RX_ON or BUSY_RX state. I am assuming that the radio
stack does not put the chip in standby or sleep state. Is this correct?
On Mon, May 19, 2008 at 5:08 PM, Miklos Maroti <[EMAIL PROTECTED]>
wrote:
> Hi Sarfraz,
>
> You should NOT use the HplRF230C.SpiResource interface, because that
> is used internally by the RF230 driver which automatically releases it
> if it does not need it. You need your own SpiInterface with your own
> ID, so you can properly share the SPI bus (via the resource
> allocation) with the RF230 driver: So use:
>
> SpiResource = SpiC.Resource[unique("Atm128SpiC.Resource")];
>
> This interface will arbitrate access to the SPI bus for you. Once
> access is granted, you need to toggle the slave select line for the
> RF230 chip and use the SpiByte interface to read/write data. For this
> you can use the SELN and SpiByte interfaces provided by the HplRF230C,
> since those can be safely shared between clients (no events). The
> HplRF230 interface is a faster SpiByte interface, you can use that one
> as well. Then your register access would become:
>
> inline uint8_t readRegister(uint8_t reg)
> {
> ASSERT( call SpiResource.isOwner() );
> ASSERT( reg == (reg & RF230_CMD_REGISTER_MASK) );
>
> call SELN.clr();
> call HplRF230.spiSplitWrite(RF230_CMD_REGISTER_READ | reg);
> call HplRF230.spiSplitReadWrite(0);
> reg = call HplRF230.spiSplitRead();
> call SELN.set();
>
> return reg;
> }
>
> By the way, which register do you want to access?
>
> Miklos
>
> On Mon, May 19, 2008 at 5:44 AM, Sarfraz Nawaz <[EMAIL PROTECTED]> wrote:
> > Hello everyone,
> >
> > I am trying to use the SPI bus of Atm1281 to peek into some of the
> registers
> > of RF230 radio chip from one of my components. I am using the SpiResource
> > provided by HplRF230C to request access to the SPI bus. The
> > SpiResource.granted event is signaled but it seems that the SPI bus is
> not
> > initialized. The SpiResource.isOwner method also returns false. See the
> code
> > snippets at the end of this email.
> >
> > My question is that, why is the SPI bus not properly initialized and why
> > does the SpiResource.isOwner return false even though the
> > SpiResource.granted event has been signaled? Do I need to initialize the
> SPI
> > bus myself? I think the resource arbiter should initialize the bus. Any
> help
> > or pointers would be much appreciated.
> >
> >
> > Regards
> >
> >
> >
> > In my application configuration I have
> >
> > App.SpiResource -> HplRF230C.SpiResource;
> >
> > and in the module implementation I have
> >
> > module TestRF230SpiM {
> > uses {
> > interface Boot;
> > interface Leds;
> > interface Resource as SpiResource;
> > interface SplitControl as RadioControl;
> > interface Atm128Spi as SpiBus;
> > }
> > }
> >
> >
> > event void RadioControl.startDone(error_t error) {
> > if(error==SUCCESS)
> > call SpiResource.request();
> > else
> > call RadioControl.start();
> > }
> >
> > event void SpiResource.granted() {
> > if( call SpiResource.isOwner() ){
> > call Leds.led1On();
> >
> > if( call SpiBus.isSpiEnabled() )
> > call Leds.led2On();
> > }
> > else{
> > call Leds.led0On();
> > call SpiResource.immediateRequest();
> > }
> > }
> >
> > I can see the led0 go on but not the others.
> >
> > _______________________________________________
> > Tinyos-help mailing list
> > [email protected]
> > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
> >
>
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