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hapi.c51
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//-------------------------------------------------------------------------//
/////////////////////////////////////////////////////////////////////////////
// +---------------------------------------------------------------------+ //
// | Hybrid Adressable Peripheral Interface | //
// | Synchronniho poloduplex rozhrani (2bit) | //
// | ------------------------------------- | //
// | Verze 2.02a Build 071203 | //
// | Tomas Hujer (c) 2007 | //
// +---------------------------------------------------------------------+ //
// | Zakladni princip komunikace vychazi z SPI, oproti puvodnimu | //
// | konceptu je ale rozsiren o moznost pripojeni vice zarizeni | //
// | na sbernici, adresaci zarizeni a volitelnou sirkou sbernice. | //
// | Maximalni pocet adresovatelnych zarizeni na sbernici zavisi | //
// | na jeji sirce, zarizeni jsou adresovana datovymi draty. | //
// | Na sbernici muze byt zarizeni i vice nez je mozne adresovat, | //
// | ovsem tyto zarizeni nemohou data prijimat ale pouze vysilat. | //
// | Sbernice je poloduplexni, vsechny draty jsou sdilene vsemi | //
// | zarizenimi. Vsechna zarizeni sleduji komunikaci a udrzuji | //
// | si vlastni virtualni status sbernice. | //
// | | //
// | Popis komunikace: | //
// | 2 bity jsou ridici a 2 datove. Kazdy smer komunikace ma svuj | //
// | handshake. Na datovych pinech se stridave prenasi informace | //
// | o aktualne prenasenem halfniblu (0-4) a samotna data. | //
// +---------------------------------------------------------------------+ //
/////////////////////////////////////////////////////////////////////////////
//-------------------------------------------------------------------------//
#include <reg52.h>
#include <stdio.h>
#include "hapi.h"
#include "hapi.def"
#include "timers.h"
#include "timers.def"
//------------------------------------------------------------------------------
extern char code ** code result_string[] = {
"OK",
"ERROR: ID MATCH",
"ERROR: TIMEOUT BITMASK",
"ERROR: TIMEOUT DATA",
"ERROR: RESULT CODE",
"ERROR: SEND - ADRESS CHECK",
"ERROR: SEND - BITINDEX CHECK",
"ERROR: SEND - DATA CHECK",
"ERROR: SEND - EOT TIMEOUT"
};
typedef enum {
HAPI_RESULT_OK = 0,
HAPI_RESULT_ERROR_ID,
HAPI_RESULT_ERROR_TIMEOUT_BITMASK,
HAPI_RESULT_ERROR_TIMEOUT_DATA,
HAPI_RESULT_ERROR_TIMEOUT_RESULT_CODE,
hapi_snd_result_code_SEND_ADDRESS_ERROR,
hapi_snd_result_code_SEND_BITINDEX_ERROR,
hapi_snd_result_code_SEND_DATA_ERROR,
HAPI_RESULT_ERROR_SEND_TIMEOUT_EOT
};
//------------------------------------------------------------------------------
char idata hapi_dest_device_id = HAPI_DEST_DEFAULT; // ID ciloveho zarizeni na sbernici (nastavit pred odesilanim)
char idata hapi_this_device_id = HAPI_MY_DEVICE_ID; // vlastni ID na sbernici
char idata hapi_inchar = 0; // prichozi znak
char idata bit_mask_index = 0; // bitova maska pro prijem / vysilani
char idata hapi_state = 0; // aktualni stav prijmu / vysilani
char idata hapi_snd_result_code = 0; // chybovy kod posledni operace
char idata hapi_rec_result_code = 0; // chybovy kod posledni operace
char idata hapi_rec_ix_wr; // index pro zapis do prijimaciho bufferu
char idata hapi_rec_ix_rd; // index pro cteni z prijimaciho bufferu
char idata hapi_rec_in; // pocet byte v prijimaciho bufferu
char xdata hapi_rec_buf[HAPI_RECBUF_SIZE]; // prijimaci buffer
//------------------------------------------------------------------------------
bit hapi_receive_result_error = 0;
bit D0_temp = 0;
bit D1_temp = 0;
bit HSI_temp = 0;
bit HSO_temp = 0;
bit hapi_receiving = 0; // priznak probihajiciho prijimani zpravy
bit hapi_sending = 0; // priznak probihajiciho odesilani zpravy
bit hapi_busy = 0; // priznak probihajici komunikace (vlastni nebo cizi)
//------------------------------------------------------------------------------
// +-------------------------------------------------+
// | Pins reset |
// +-------------------------------------------------+
void hapi_pin_reset()
{
HSI = 1;
HSO = 1;
D0 = 1;
D1 = 1;
}
// +-------------------------------------------------+
// | HAPI text result code |
// +-------------------------------------------------+
char *hapi_result_string()
{
return(result_string[hapi_snd_result_code]);
}
// +-------------------------------------------------+
// | Signal testing |
// +-------------------------------------------------+
// | Cekaci smycka, ceka se dokud je signal, pokud |
// | signal zmeni hodnotu na 1, je smycka ukoncena |
// | a vracena hodnota 0, pokud vyprsi cas, je |
// | nastaven chybovy status hapi_snd_result_code, |
// | resetovany komunikacni piny a vracena 1 |
// +-------------------------------------------------+
bit hapi_test_signal(bit level, int time, char error_result_code)
{
TIMER_HAPI = time; // nastav timeout
while(HSI == level) // cekej dokud ma signal spec. uroven
{
if(!TIMER_HAPI) // pokud vyprsel timeout
{
hapi_snd_result_code = error_result_code; // nastav cislo chyby
hapi_pin_reset(); // resetuj piny
return(1); // vrat 1
}
}
return(0); // pokud byl signal, vrat 0
}
// +------------------------------------+
// | Set data byte to data pins |
// +------------------------------------+
void hapi_set_data(char data_byte)
{
D0 = ((data_byte & 1)?1:0);
D1 = ((data_byte & 2)?1:0);
}
// +------------------------------------+
// | Get data byte from data pins |
// +------------------------------------+
char hapi_get_data()
{
char data_byte = 0;
data_byte = ((char) D0 | ((char) D1 << 1)); // zapis data z pinu do byte
return(data_byte);
}
// +-------------------------------------------------+
// | HAPI device output routine |
// +-------------------------------------------------+
char hapi(char c)
{
char hapi_bit_index = 0;
char hapi_bit_mask = 0;
char hapi_error_repeat = 0;
if(hapi_dest_device_id != hapi_this_device_id)
{
HSI = HSO = 1; // handshakes jako vstupy
// -------------------------------------------------------------------
// Nastav na datove sbernici destination device ID
D0 = (bit) (hapi_dest_device_id);
D1 = (bit) (hapi_dest_device_id >> 1);
HSO = 0; // shod handshake
//printf("HAPI,SND: set device ID: %i\n", (int) hapi_dest_device_id);
// -------------------------------------------------------------------
// Cekej na shozeni HSI (potvrzeni prevzeti dat)
if(hapi_test_signal(1, HAPI_SND_TIMEOUT, HAPI_RESULT_ERROR_TIMEOUT_BITMASK))
return(0);
// -------------------------------------------------------------------
// Nastav datove piny jako vstupy,
// otestuj zda je device_id spravne nastaveno ve vybranem zarizeni
// zapis poradi byte (0-3)
// nastav HSO
D0 = D1 = 1; // Nastav datove piny jako vstupy
//printf("HAPI,SND: check device ID: ");
if(((D0 != (hapi_dest_device_id & 1))) ||
(D1 != ((hapi_dest_device_id & 2) >> 1))) // zkontroluj zda je adresa ok
{
hapi_snd_result_code = hapi_snd_result_code_SEND_ADDRESS_ERROR; // pripadne nastav chybu
//printf("ERROR\n");
}
//else
// printf("OK\n");
hapi_error_repeat = 3; // nastav pocet pokusu
// -------------------------------------------------------------------
for(hapi_bit_index = 0; hapi_bit_index < 4; hapi_bit_index++)
{
SEND_ERROR_REPEAT:
// -----------------------------------------------------------
// Nastav na datove sbernici poradi bitu ktere budou nasledovat
D0 = D0_temp = (hapi_bit_index & 1); // zapis poradi bitu do D0
D1 = D1_temp = (hapi_bit_index & 2) >> 1; // zapis poradi bitu do D1
HSO = 1; // potvrd nahozenim HSO
//printf("HAPI,SND: set bitix: %i\n", (int) hapi_bit_index);
// -----------------------------------------------------------
// Cekej na nahozeni HSI
if(hapi_test_signal(0, HAPI_SND_TIMEOUT, HAPI_RESULT_ERROR_TIMEOUT_BITMASK))
return(0);
// -----------------------------------------------------------
// Nastav datove piny jako vstupy
// otestuj zda je bit_index spravne nastaven
D0 = D1 = 1; // Nastav datove piny jako vstupy
//printf("HAPI,SND: check bitix: ");
if((D0 != D0_temp) ||
(D1 != D1_temp)) // Zkontroluj zapsanou hodnotu
{
hapi_snd_result_code = hapi_snd_result_code_SEND_BITINDEX_ERROR; // pripadne nastav chybu
//printf("ERROR\n");
return(0);
}
//else
//printf("OK\n");
// -----------------------------------------------------------
// Zapis maskovana data na datovou sbernici
// Shod HSO
hapi_bit_mask = (1 << (hapi_bit_index*2+0));
//printf("HAPI,SND: masked0: %u\n", (int) (c & hapi_bit_mask));
D0 = D0_temp = ((c & hapi_bit_mask)?1:0); // vymaskuj a zapis bit D0 (LOW)
hapi_bit_mask = (1 << (hapi_bit_index*2+1));
//printf("HAPI,SND: masked1: %u\n", (int) (c & hapi_bit_mask));
D1 = D1_temp = ((c & hapi_bit_mask)?1:0); // vymaskuj a zapis bit D1 (HIGH)
//printf("HAPI,SND: set data:<%c> D0: %c, D1: %c\n", c, D0_temp?'1':'0', D1_temp?'1':'0');
HSO = 0;
// -----------------------------------------------------------
// Cekej na shozeni HSI
if(hapi_test_signal(1, HAPI_SND_TIMEOUT, HAPI_RESULT_ERROR_TIMEOUT_DATA))
return(0);
// -----------------------------------------------------------
// Nastav datove piny jako vstupni
// Zkontroluj spravnost dat na sbernici
D0 = D1 = 1; // Nastav datove piny jako vstupy
//printf("HAPI,SND: check data: D0: %c, D1: %c ... ", D0?'1':'0', D1?'1':'0');
if((D0 != D0_temp) ||
(D1 != D1_temp)) // Zkontroluj zapsanou hodnotu
{
if(hapi_bit_index < 3) // posledni bity nelze opravit, doslo by k desynchronizaci
{
if(hapi_error_repeat) // pokud neni vycerpan pocet pokusu
{
hapi_error_repeat--; // odecti pokus
goto SEND_ERROR_REPEAT; // jdi znovu na odeslani bitoveho indexu
}
}
hapi_snd_result_code = hapi_snd_result_code_SEND_DATA_ERROR; // pripadne nastav chybu
//printf("ERROR\n");
return(0);
}
//else
//printf("OK\n");
}
// -----------------------------------------------------------
// Cekej na nahozeni HSI
if(hapi_test_signal(1, HAPI_SND_TIMEOUT, HAPI_RESULT_ERROR_TIMEOUT_RESULT_CODE))
return(0);
// -----------------------------------------------------------
// Odesli chybovy stav odesilani
hapi_set_data(hapi_snd_result_code);
HSO = 1;
// -----------------------------------------------------------
//printf("HAPI,SND: --- TRANSMIT END --- \n\n");
if(hapi_test_signal(0, HAPI_SND_TIMEOUT, HAPI_RESULT_ERROR_SEND_TIMEOUT_EOT))
return(0);
hapi_snd_result_code = HAPI_RESULT_OK;
return(c);
}
else
{
hapi_snd_result_code = HAPI_RESULT_ERROR_ID;
return(0);
}
}
// +------------------------------------+
// | Get incoming char from buffer |
// +------------------------------------+
char hapi_getchar()
{
char out;
if(hapi_rec_in)
{
hapi_rec_ix_rd %= HAPI_RECBUF_SIZE; // rotace indexu
out = hapi_rec_buf[hapi_rec_ix_rd]; // nacti znak z prijimaciho bufferu
hapi_rec_ix_rd++; // posun index pro cteni
hapi_rec_in--; // sniz pocet znaku v bufferu
return(out);
}
return(0);
}
// +-------------------------------+
// | Incoming data process |
// +-------------------------------+
void hapi_proc(void)
{
typedef enum {
HAPI_PROC_GET_ADRRESS = 0,
HAPI_PROC_GET_DATA_INDEX,
HAPI_PROC_GET_DATA,
HAPI_PROC_GET_RESULT,
HAPI_PROC_WAIT_END,
HAPI_PROC_STOP
};
char data_in = 0;
switch(hapi_state)
{
case HAPI_PROC_GET_ADRRESS:
if(~HSI) // Cekej na shozeni HSI
{
if(~hapi_busy) // pokud jiz neprobiha komunikace
{
hapi_busy = 1; // nastav priznak obsazene komunikace (i kdyz neni vlastni)
//printf("HAPI,REC: interface busy\n");
TIMER_HAPI = HAPI_REC_TIMEOUT; // nastav timeout
if(hapi_get_data() == hapi_this_device_id ) // pokud je na datove sbernici tva adresa
{
//printf("HAPI,REC: calling me\n");
hapi_receiving = 1; // nastav flag prijmu
hapi_set_data(hapi_this_device_id); // Nastav datove bity na tve DEVICE_ID (pro check)
HSO = 0; // Potvrd to shozenim HSO
hapi_inchar = 0; // vynuluj prijimaci znak
hapi_state = HAPI_PROC_GET_DATA_INDEX; // jdi na dalsi stav
}
}
else
{
//printf("HAPI,REC: wait fo end\n");
TIMER_HAPI = HAPI_QUIET_TIMEOUT;
hapi_state = HAPI_PROC_WAIT_END;
}
}
break;
case HAPI_PROC_GET_DATA_INDEX:
if(HSI) // Cekej na nahozeni HSI
{
TIMER_HAPI = HAPI_REC_TIMEOUT; // nastav timeout
hapi_set_data(0xFF); // Nastav datove piny jako vstupy
bit_mask_index = hapi_get_data(); // nacti index bitove masky
//printf("HAPI,REC: incoming bitmask index: %i\n", (int) bit_mask_index);
hapi_set_data(bit_mask_index); // zapis index zpet pro check
HSO = 1; // potvrd prijeti nastavenim HSO
hapi_state = HAPI_PROC_GET_DATA; // jdi na dalsi stav
}
else
{
if(!TIMER_HAPI)
hapi_state = HAPI_PROC_STOP;
}
break;
case HAPI_PROC_GET_DATA:
if(~HSI) // Cekej na shozeni HSI
{
if(hapi_rec_in < HAPI_RECBUF_SIZE) // pokud je v prijimacim bufferu misto
{
hapi_rec_ix_wr %= HAPI_RECBUF_SIZE; // rotuj index
hapi_set_data(0xFF); // Nastav datove piny jako vstupy
data_in = hapi_get_data();
data_in &= 3;
//printf("HAPI,REC: D0:%c, D1:%c\n", (data_in&1)?'1':'0', (data_in&2)?'1':'0');
hapi_set_data(data_in); // zapis data zpet na sbernici pro check
hapi_inchar |= (data_in << (bit_mask_index * 2)); // zapis data z pinu na sve misto v byte
HSO = 0; // nastav HSO, potvrzeni prevzeti
//printf("HAPI,REC: ix: %i\n", (int) bit_mask_index);
if(bit_mask_index >= 3)
{
hapi_rec_buf[hapi_rec_ix_wr] = hapi_inchar; // zapis znak do bufferu
hapi_rec_ix_wr++; // posun index
hapi_rec_in++; // pripocti pocet znaku v bufferu
hapi_state = HAPI_PROC_GET_RESULT;
//printf("HAPI,REC: databyte: %i, complete\n", (int) hapi_inchar);
}
else
{
//printf("HAPI,REC: databyte %i\n", (int) hapi_inchar);
hapi_state = HAPI_PROC_GET_DATA_INDEX; // jdi zpet na index dat
}
}
}
else
{
if(!TIMER_HAPI)
hapi_state = HAPI_PROC_STOP;
}
break;
case HAPI_PROC_GET_RESULT:
if(HSI) // Cekej na shozeni HSI
{
hapi_set_data(0xFF); // Nastav datove piny jako vstupy
hapi_rec_result_code = hapi_get_data(); // nacti chybovy kod
HSO = 1; // nastav HSO, potvrzeni prevzeti
hapi_state = HAPI_PROC_STOP; // jdi na proces ukonceni komunikace
}
else
{
if(!TIMER_HAPI)
hapi_state = HAPI_PROC_STOP;
}
break;
case HAPI_PROC_WAIT_END:
if((HSI != HSI_temp) || (HSO != HSO_temp)) // pokud zmena na komunikaci
{
HSI_temp = HSI; // uloz zmenu
HSO_temp = HSO;
TIMER_HAPI = HAPI_QUIET_TIMEOUT; // nastav timeout
}
else
{ // pokud vyprsel timeout
if(!TIMER_HAPI)
{
hapi_state = HAPI_PROC_STOP; // resetuj komunikaci
}
}
break;
// konec prijmu a komunikace
case HAPI_PROC_STOP:
//printf("HAPI,REC: --- kill ---\n");
hapi_receiving = 0; // shod flag prijimani znaku
hapi_busy = 0; // shod flag probihajici komunikace
hapi_pin_reset(); // resetuj piny procesoru
hapi_state = 0; // resetuj stavovy automat
break;
}
/*
if(hapi_busy || hapi_receiving) // pokud je komunikace obsazena, nebo je stale nasteven flag prijmu
{
if(HSO & HSI & D0 & D1) // pokud jsou piny v klidu
{
if(!TIMER_HAPI) // pokud vyprsel cas, uvolni komunikaci
{
hapi_busy = 0; // resetuj flag obsazene komunikace
hapi_receiving = 0; // resetuj flag prijmu
}
}
else
{
//TIMER_HAPI = TIME_2SEC;
}
}
*/
}
void hapi_init()
{
hapi_pin_reset();
hapi_state = 0;
hapi_rec_ix_rd = 0;
hapi_rec_ix_wr = 0;
hapi_rec_in = 0;
}