EduFRC Serial Port Help
Hi!
(this is a followup to this thread.)
I am trying to communicate between the old EduRC controller and my nokia phone using the TTL port.
according to this page most nokia phones use the F-BUS protocol:
Quote:
F-Bus is the later high-speed full-duplex bus. It uses one pin for transmitting data and one pin for receiving data plus the ground pin. Very much like a standard serial port. It is fast 115,200bps, 8 data bits, no parity, one stop bit. For F-Bus the data terminal ready (DTR) pin must be set and the request to send (RTS) pin cleared.
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My question is:
How do I set the parameters on Kevin's code to match the ones specified above?
Here is the code segment which I think sets all the parameters for serial port 2 (TTL, right?):
Code:
void Init_Serial_Port_Two(void)
{
// Start by initializing the serial port with code
// common to receive and transmit functions
SPBRG2 = BAUD_9600; // baud rate generator register [200]
//
TXSTA2bits.BRGH = 0; // high baud rate select bit (asynchronous mode only) [198]
// 0: low speed
// 1: high speed
//
PIE3bits.RC2IE = 0; // receive interrupt enable bit [95]
// 0: disables received data interrupt
// 1: enables received data interrupt
//
PIE3bits.TX2IE = 0; // transmit interrupt enable bit [95]
// 0: disables transmit register empty interrupt
// 1: enables transmit register empty interrupt
//
TXSTA2bits.SYNC = 0; // USART mode select bit [198]
// 0: asynchronous mode
// 1: synchronous mode
//
TXSTA2bits.CSRC = 0; // clock source select bit (synchronous mode only) [198]
// 0: Slave mode (clock generated by external source)
// 1: Master mode (clock generated internally from BRG)
// if receive functionality is to be included in the
// software build, include code that is specific to
// initializing the receiver
#ifdef ENABLE_SERIAL_PORT_TWO_RX
//
TRISGbits.TRISG2 = 1; // make sure the RG2/RX2/DT2 pin is configured as an input [120]
//
RCSTA2bits.RX9 = 0; // 9-bit receive enable bit [199]
// 0: 8-bit reception mode
// 1: 9-bit reception mode
//
RCSTA2bits.ADEN = 0; // address detect enable bit (9-bit asynchronous mode only) [199]
// 0: disables address detection
// 1: enables address detection
//
RCSTA2bits.SREN = 1; // single receive enable bit (master synchronous mode only) [199]
// 0: disables single receive mode
// 1: enables single receive mode
//
RCSTA2bits.CREN = 1; // continuous receive mode enable bit [199]
// asynchronous mode:
// 0: disables receiver
// 1: enable receiver
// synchronous mode:
// 0: disables continuous receive
// 1: enables continuous receive until CREN is cleared [199]
//
IPR3bits.RC2IP = 0; // receive interrupt priority bit (must be 0 for IFI controllers) [98]
// 0: low-priority
// 1: high-priority
//
PIE3bits.RC2IE = 1; // receive interrupt enable bit [95]
// 0: disables received data interrupt
// 1: enables received data interrupt
#endif //
// if transmit functionality is to be included in the
// software build, include code that is specific to
// initializing the serial port transmitter
#ifdef ENABLE_SERIAL_PORT_TWO_TX
//
stdout = _H_USER; // use this driver for output stream functions
//
//
TRISGbits.TRISG1 = 0; // make sure the RG1/TX2/CK2 pin is configured as an output [120]
//
TXSTA2bits.TX9 = 0; // 9-bit transmit enable bit [198]
// 0: 8-bit transmission mode
// 1: 9-bit transmission mode
//
IPR3bits.TX2IP = 0; // transmit interrupt priority bit (must be 0 for IFI controllers) [98]
// 0: low-priority
// 1: high-priority
//
PIE3bits.TX2IE = 1; // transmit interrupt enable bit [95]
// 0: disables transmit register empty interrupt
// 1: enables transmit register empty interrupt
//
TXSTA2bits.TXEN = 1; // Enable transmitter [198]
// 0: serial transmitter is disabled
// 1: serial transmitter
#endif //
// finally, turn on the serial port
RCSTA2bits.SPEN = 1; // Serial Port Enable [199]
// 0: serial port is disabled
// 1: serial port is enabled
}
can you help me understand how to set these parameters? I can guess some like baud rate but not sure about others like whether I am using synchronous or asynchronous mode and there are just too many combinations to test them all :ahh:
Also:
Quote:
The next step is to synchronize the UART in the phone with your PC or microcontroller. This is done by sending a string of 0x55 or 'U' 128 times. Simple! The bus is now ready to be used for sending frames.
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1)does this mean I'm using synchronous communications?
2)how do I send, manipulate and receive HEX data in C? in this instance I can just send 'U' (I guess), but what if I need to send 0x01 or 0xFF? do I just send the char equivalent? (FF is 255 so I can cover 0x00 to 0xFF in a char variable so that does make sense...)
Thanks alot!
-Leav |
