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tdc stuff

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This commit is contained in:
Olaf Rempel 2008-02-06 15:30:54 +01:00
parent d74bef5e61
commit 9b703ef0a9
4 changed files with 105 additions and 72 deletions
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2
include/fifo.h
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@ -23,6 +23,8 @@ uint32_t fifo_txpdc(struct fifo *fifo, AT91S_PDC *pdc, uint16_t maxsize);
uint32_t fifo_putbyte(struct fifo *fifo, char c);
uint32_t fifo_getbyte(struct fifo *fifo, char *p);
char * fifo_peek(struct fifo *fifo, uint32_t len);
struct fifo * fifo_alloc(uint32_t size);
#endif /*FIFO_H_*/

6
include/telemetrie.h
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@ -48,7 +48,7 @@ struct tdc_getvars_reply {
uint8_t size;
uint8_t id; // variable ID (max 256 vars / board)
uint32_t flags; // variable parameters (type, size, ro/rw)
uint8_t name[0]; // variable name, excluding '\0'
char name[0]; // variable name, excluding '\0'
} __attribute__ ((packed));
struct tdc_getvalue_request {
@ -87,8 +87,8 @@ struct tdc_reqvalues_reply {
struct tdc_value {
const void *ptr;
const uint8_t *name;
void *data;
const char *name;
uint32_t flags;
};

15
src/fifo.c
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@ -16,6 +16,7 @@
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <stdio.h>
#include "AT91SAM7S256.h"
#include "atomic.h"
#include "fifo.h"
@ -45,6 +46,7 @@ static uint32_t fifo_used(struct fifo *fifo)
uint32_t fifo_put(struct fifo *fifo, const char *buf, uint32_t len)
{
uint32_t left = fifo->size - fifo_used(fifo);
// TODO: check semantic
if (len > left)
len = left;
@ -72,6 +74,19 @@ uint32_t fifo_get(struct fifo *fifo, char *buf, uint32_t len)
return len;
}
/*
* returns a pointer to the data in the fifo
* (without changing internal state)
*/
char * fifo_peek(struct fifo *fifo, uint32_t len)
{
uint32_t used = fifo_used(fifo);
if (len > used)
return NULL;
return fifo->buf + (fifo->out & FIFO_MASK(fifo));
}
/*
* receive data via PDC and put it into fifo
*/

148
src/telemetrie.c
View File

@ -27,12 +27,18 @@
extern struct tdc_value _tdc_value_table;
extern struct tdc_value _tdc_value_table_end;
typedef uint32_t (txfunc_t)(const uint8_t *data, uint32_t size);
/*
* transmit function
* returns:
* -1 : could not sent data (e.g. fifo full)
* >= 0 : bytes sent
*/
typedef uint32_t (txfunc_t)(struct tdc_pkt_header *head);
/* just eat the packet */
static uint32_t txdummy(const uint8_t *data, uint32_t size)
static uint32_t txdummy(struct tdc_pkt_header *head)
{
return -1;
return head->size;
}
/* table of txfuncs for routing/forwarding */
@ -53,88 +59,84 @@ void tdc_register_txfunc(uint32_t addr, txfunc_t *txfunc)
transmit_table[addr] = txfunc;
}
int32_t tdc_transmit(uint32_t addr, const uint8_t *data, uint32_t size)
int32_t tdc_transmit(uint32_t addr, struct tdc_pkt_header *head)
{
if (addr <= ARRAY_SIZE(transmit_table))
return transmit_table[addr](data, size);
return transmit_table[addr](head);
return -1;
}
/*
void *blub = NULL;
func(&blub);
* send all variable names & flags
* returns:
* 0 - success (*id = 0)
* -1 - not all data was sent, restart request later (*id has restart-point)
*/
int32_t tdc_get_vars(void **privdata)
int32_t tdc_get_vars(uint32_t *id)
{
struct tdc_value **value = (struct tdc_value **)privdata;
struct tdc_value *value = &_tdc_value_table + *id;
if (*value == NULL)
*value = &_tdc_value_table;
uint32_t id = (*value - &_tdc_value_table) / sizeof(struct tdc_value);
while (*value < &_tdc_value_table_end) {
uint32_t datalen = strlen((*value)->name);
while (value < &_tdc_value_table_end) {
uint32_t datalen = strlen(value->name);
struct tdc_getvars_reply *reply = alloc(sizeof(struct tdc_getvars_reply) + datalen);
reply->cmd = TDC_REPLY | TDC_ADDR1 | TDC_GETVARS;
reply->size = sizeof(struct tdc_getvars_reply) + datalen;
reply->id = id;
reply->flags = (*value)->flags;
memcpy(reply->name, (*value)->name, datalen);
reply->id = *id;
reply->flags = value->flags;
memcpy(reply->name, value->name, datalen);
int32_t ret = transmit_table[TDC_ADDR0]((const uint8_t *)reply, reply->size);
uint32_t txerror = (tdc_transmit(TDC_ADDR0, ((struct tdc_pkt_header *)reply)) != reply->size);
free(reply);
if (ret != reply->size)
/* transmit fifo is full, remember position (*id) and restart */
if (txerror)
return -1;
id++;
(*value)++;
(*id)++;
value++;
}
/* TODO: all done */
(*value) = NULL;
*id = 0;
return 0;
}
#if 0
static int32_t tdc_get_values(uint8_t *buf, uint32_t size, void **key)
int32_t tdc_get_value(uint32_t id)
{
if (*key == NULL)
*key = &_tdc_value_table;
struct tdc_value *value = &_tdc_value_table + id;
uint32_t datalen = value->flags & TDC_SIZEMASK;
uint32_t id = (*key - &_tdc_value_table) / sizeof(struct tdc_value);
uint32_t pos = 0;
struct tdc_getvalue_reply *reply = alloc(sizeof(struct tdc_getvalue_reply) + datalen);
reply->cmd = TDC_REPLY | TDC_ADDR1 | TDC_GETVALUE;
reply->size = sizeof(struct tdc_getvars_reply) + datalen;
reply->id = id;
memcpy(reply->data, value->data, datalen);
while (*key < &_tdc_value_table_end) {
struct tdc_value *tmp = (struct tdc_value *)*key;
uint32_t datalen = (tmp->flags & TDC_SIZEMASK);
int32_t txerror = (tdc_transmit(TDC_ADDR0, ((struct tdc_pkt_header *)reply)) != reply->size);
free(reply);
/* fits in buffer? */
if ((size - pos) < (2 + 1 + datalen))
return (pos > 0) ? pos : -1;
buf[pos++] = TDC_VALUEOP;
buf[pos++] = 1 + datalen;
buf[pos++] = id++;
memcpy(buf + pos, tmp->ptr, datalen);
pos += datalen;
*key += sizeof(struct tdc_value);
return (txerror) ? -1 : 0;
}
return pos;
void tdc_set_value(uint32_t id, uint8_t *data)
{
struct tdc_value *value = &_tdc_value_table + id;
uint32_t datalen = value->flags & TDC_SIZEMASK;
// TODO: atomic?
memcpy(value->data, data, datalen);
}
#endif
/*
* parses tdc data
* returns:
* -1 : data too short / error
* >= 0 : data read, come back if there is more
*/
int32_t tdc_parse_pkt(txfunc_t *txfunc, const uint8_t *data, uint32_t size)
{
// TODO: use a fifo, with a peek function?
struct tdc_pkt_header *head = (struct tdc_pkt_header *)data;
if (size < sizeof(struct tdc_pkt_header))
@ -142,41 +144,55 @@ int32_t tdc_parse_pkt(txfunc_t *txfunc, const uint8_t *data, uint32_t size)
/* if it's a hello-request, remember the txfunc as path to the host */
if ((head->cmd & (TDC_OPCODEMASK & TDC_DIR)) == TDC_HELLO)
transmit_table[TDC_ADDR0] = txfunc;
tdc_register_txfunc(TDC_ADDR0, txfunc);
/* all replys go to the HOST */
if (head->cmd & TDC_REPLY) {
return transmit_table[TDC_ADDR0](data, head->size);
// TODO: wrong returncode
return tdc_transmit(TDC_ADDR0, head);
}
/* forward this packet? */
if ((head->cmd & TDC_ADDRMASK) != TDC_ADDR1) {
uint32_t addr = (head->cmd & TDC_ADDRMASK) >> 4;
return transmit_table[addr](data, head->size);
// TODO: wrong returncode
return tdc_transmit(addr, head);
}
/* parse the packet */
switch (head->cmd & TDC_OPCODEMASK) {
/* HELLO from HOST */
case TDC_HELLO:
transmit_table[TDC_ADDR0]((const uint8_t *)&hello_reply, sizeof(hello_reply));
tdc_transmit(TDC_ADDR0, (struct tdc_pkt_header *)&hello_reply);
break;
case TDC_GETVARS:
// TODO: exec func
break;
case TDC_GETVARS: {
static uint32_t i;
case TDC_GETVALUE:
// TODO: exec func
break;
/* tx-fifo is full, complete request later */
if (tdc_get_vars(&i) == -1)
return 0;
case TDC_SETVALUE:
// TODO: exec func
break;
} break;
case TDC_REQVALUES:
// TODO: exec func
break;
case TDC_GETVALUE: {
struct tdc_getvalue_request *pkt = (struct tdc_getvalue_request *)data;
/* tx-fifo is full, retry request later */
if (tdc_get_value(pkt->id) == -1)
return 0;
} break;
case TDC_SETVALUE: {
struct tdc_setvalue_request *pkt = (struct tdc_setvalue_request *)data;
tdc_set_value(pkt->id, pkt->data);
} break;
case TDC_REQVALUES: {
struct tdc_reqvalues_request *pkt = (struct tdc_reqvalues_request *)data;
} break;
case TDC_TERMINAL:
// TODO: not possible?