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kmp84
Joined: 02 Feb 2010
Posts: 345
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| two USART stream with different speed |
 Posted: Wed Mar 09, 2011 3:35 pm |
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Hello for All..
I've a few question about serial communication :
1. What is the best method for receiving serial stream ? (linear buffer with timer ISR ->Neutone example, circular buffering ->CCS example ...)
2. I've searching good topic for setup and manage CCS #INT_ISR.?
3. Any example for convert one protocol to other with different UART speed? |
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temtronic
Joined: 01 Jul 2010
Posts: 9224
Location: Greensville,Ontario
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| Posted: Wed Mar 09, 2011 4:17 pm |
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What's best for one application is not the best for all applications. Only you know the criteria and hardware for your application. Usually, using a ring buffer and interrupts will be the most used way to receive asynchronus serial data, but not 'carved in stone'.
There are several examples as well as Q&As about CCS's use it's ISR handling, again, how you implement it or part of it, depends on your specifics.
Your query about 'Conversion of protocols with different UART speeds' is unclear. Usually the protocol is fixed,encompassing the data stream format, timing, logic levels, hard pinout, etc. One normally doesn't change any of this unless you're into some very high security data transfers, usually to prevent 'hacking'. If this this not what you meant, please reprhrase the question. |
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kmp84
Joined: 02 Feb 2010
Posts: 345
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| Posted: Thu Mar 10, 2011 2:30 am |
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thanks for join ... Yes my questions is not very clear and I wil put part of code for discussion...
| Code: |
#include <18F452.H>
#fuses HS,PROTECT,NOOSCSEN,NODEBUG,PUT,NOWDT,NOBROWNOUT,NOLVP,NOCPD,NOWRT,NOSTVREN,NOCPB
//////////////////////////////////////
#use delay(clock=11 059 200) //
#use rs232(baud=1200,rcv=PIN_C7,xmit=PIN_C6,errors,enable=PIN_C4,STREAM=dispenser) //
#use rs232(baud=9600,rcv=PIN_B0,xmit=PIN_B1,STREAM=PC,errors,FLOAT_HIGH) //
///////////////////////////////////////////////////////////////////////////////////////////
#define buffer_size_pc 32
#define buffer_size_ds 32
// #define buffer_size_tmp 32
#priority ext,rda
//Global Variables.....
int buffer_pc_rx [buffer_size_pc];
int buffer_pc_tx [buffer_size_pc];
//int buffer_temp [buffer_size_tmp];
int buffer_ds_rx [buffer_size_ds];
int buffer_ds_tx [buffer_size_ds];
int index_pc_rx;
int index_ds_rx;
int1 packet_pc;
int1 packet_ds;
int ext;
int index_temp;
int index_temp2;
int rd;
int temp_state = PUMP_State;
int temp_gun =0x00;
#int_timer1
void TIMER1_isr()
{
disable_interrupts(int_TIMER1);
packet_pc=1;
index_pc_rx =0;
}
#int_ext
void PC_ISR ()
{
ext = fgetc(PC);
if(!packet_pc)
{ buffer_pc_rx[index_pc_rx] = ext;
index_temp=index_pc_rx;
if(++index_pc_rx == buffer_size_pc)
{
index_pc_rx =0;
}
set_timer1(63500); //
clear_interrupt(int_TIMER1);
enable_interrupts(int_TIMER1);
}
}
#int_timer3
void timer3_isr ()
{
disable_interrupts(int_TIMER3);
packet_ds=1;
index_ds_rx =0;
}
#int_rda
void rda_isr ()
{
rd=fgetc(dispenser);
if(!packet_ds)
{
buffer_ds_rx[index_ds_rx]=rd;
index_temp2=index_ds_rx;
if (++index_ds_rx==buffer_size_ds)
{
index_ds_rx=0;
}
set_timer3(24933);
clear_interrupt(int_TIMER3);
enable_interrupts(int_TIMER3);
}
}
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