Hi,
I saw you were trying to connect a gps to your msp430 chip using TinyOS as
operation system. It could be done, but reading your mails i have a few
question before i can give you the answer you need.
1- you intend to receive and transmit to gps or just receive?
2-you intend to receive and transmit to pc or just transmit?
Why I am asking this, because as you said you will share hardware pins
between pc and gps so in order to do this you can only use rx to connect to
gps and tx to connect to pc.
You will need this configuration
configuration UartGPSC {
provides interface StdControl;
provides interface UartStream;
provides interface UartByte;
}
implementation {
components new Msp430Uart0C() as UartC;
UartStream = UartC;
UartByte = UartC;
components UartGPSP;
StdControl = UartGPSP;
UartGPSP.Msp430UartConfigure <- UartC.Msp430UartConfigure;
UartGPSP.Resource -> UartC.Resource;
}
and this module
module UartGPSP {
provides interface StdControl;
provides interface Msp430UartConfigure;
uses interface Resource;
}
implementation {
msp430_uart_union_config_t msp430_uart_gps_config = { {ubr: UBR_1MHZ_4800,
umctl: UMCTL_1MHZ_4800, ssel: 0x02, pena: 0, pev: 0, spb: 0, clen: 1,
listen: 0, mm: 0, ckpl: 0, urxse: 0, urxeie: 1, urxwie: 0, utxe : 1, urxe :
1} };
command error_t StdControl.start(){
return call Resource.immediateRequest();
}
command error_t StdControl.stop(){
call Resource.release();
return SUCCESS;
}
event void Resource.granted(){}
async command msp430_uart_union_config_t* Msp430UartConfigure.getConfig()
{
return &msp430_uart_gps_config;
}
}
In your application module you will need to wire to the stdcontrol of this
configuration to request the resource and use UartStream or UartByte interfaces
to send and receive. In this case the baud rate is set to 4800 as i used
with a gps too.
Related to the swithching you should do it in your application module. But
first you should answer the 2 question a ask.
Hope this helps.
-Bill
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