[ts-7000] Re: Disabling TS-UARTs on TS-7800

["malcolmnixon" <>]

I'm still unable to get it to function, although I think I may have found the 
right tree to bark up.

The TS-7800 Preliminary Manual states:
>> Note: a baud rate index of 7 is reserved in 
>> the TS-UART to mean "disabled".

The following is the assign_bits_BAUD function from tsuart1.c and specifically 
identifies a baud-rate of zero and sets the baud rate index to 7:
>> static unsigned assign_bits_BAUD(unsigned reg_value,int baud_rate) >> {
>>   int val;
>>   switch (baud_rate) {
>>   case 115200: val = encode_BAUD(reg_value,0); break;
>>   case 57600:  val = encode_BAUD(reg_value,1); break;
>>   case 38400:  val = encode_BAUD(reg_value,2); break;
>>   case 19200:  val = encode_BAUD(reg_value,3); break;
>>   case 9600:   val = encode_BAUD(reg_value,4); break;
>>   case 4800:   val = encode_BAUD(reg_value,5); break;
>>   case 2400:   val = encode_BAUD(reg_value,6); break;
>>   case 0:      val = encode_BAUD(reg_value,7); break;
>>   default:     val = reg_value; break;
>>   }
>>   return val;
>> }

I tried opening '/dev/ttts5' and configuring it with a baud-rate of zero; then 
(with ttts5 still open) opening '/dev/ttts4' and driving the RTS line. 
Unfortunately this made no difference (aka RTS/pin-7 still driven at -6.1v 
regardless of the desired RTS state).




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