Hi,
I am currently working on TinyOS-2.x version. I need to attach a 7-segment LED
screen to my development platform so that i can display some data on the
Screen. The screen expects a Clock and Data signal. The peripheral has a
MM74HC595 serial in parallel shift register which expects a clock and data
signal (1byte) from the host microcontroller. Then, the screen has further 3
more 74HC595 which get their data from its predecesors. So, if I am able to
load 1byte of data on each clock cycle correctly should do the trick. In this
regard, i saw that there are some device drivers for mm74hc595 available at
/tos/chips/mm74hc595.
I have written the HplMM74HC595PinsC.nc file as directed in the MM74HC595C.nc
as follows:
/**
* Mapping the 74HC595 shift register pins to Atmega128 pins for chipconz
platform.
*
* @author Varun Jain
* @version $Revision: 1.1 $ $Date: 2008/08/22 18:56:06 $
*/
configuration HplMM74HC595PinsC {
provides {
interface GeneralIO as Ser;
interface GeneralIO as Sck;
interface GeneralIO as Rck;
}
}
implementation {
components HplAtm128GeneralIOC as IO;
Ser = IO.PortD3;
Sck = IO.PortD5;
Rck = IO.PortD2;
}
What i am unable to understand is that in my application, I will need to use
this MM74HC595C interface. But i do not understand how can i wire it up.Is
there any test application in which you have used this interface. I am
believing that i will need to do something like this:
/* TestAppC.nc */
configuration TestAppC {}
implementation {
// Other components
components MM74HC595;
TestC.??? = MM74HC595;
}
?? ----> What will the interface i will need to use in the TestC
implementation......
What i do not really understand is that i need to send data on only 1pin (Ser
in thid case) so how can i do this in the application. I mean in the TestC what
is the interface that i should use .. GeneralIO or ???
Any help will be really appreciated.
Cheers,
Varun
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