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Simplify data types, now that I believe that 'frames' will always be rather short

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henryk@ploetzli.ch 2009-10-23 21:40:17 +00:00
parent ec81f90ec3
commit ccedd6ae6b
1 changed files with 30 additions and 33 deletions
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63
armsrc/legicrf.c
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@ -8,21 +8,23 @@
#include "apps.h"
#include "legicrf.h"
#include "unistd.h"
#include "stdint.h"
static struct legic_frame {
int num_bytes;
int num_bits;
char data[10];
int bits;
uint16_t data;
} current_frame;
static char queries[][4] = {
static struct legic_frame queries[] = {
{7, 0x55}, /* 1010 101 */
};
static char responses[][4] = {
static struct legic_frame responses[] = {
{6, 0x3b}, /* 1101 11 */
};
static void frame_send(char *response, int num_bytes, int num_bits)
static void frame_send(uint16_t response, int bits)
{
#if 0
/* Use the SSC to send a response. 8-bit transfers, LSBit first, 100us per bit */
@ -36,9 +38,10 @@ static void frame_send(char *response, int num_bytes, int num_bits)
while(AT91C_BASE_TC1->TC_CV < 490) ;
int i;
for(i=0; i<(num_bytes*8+num_bits); i++) {
for(i=0; i<bits; i++) {
int nextbit = AT91C_BASE_TC1->TC_CV + 150;
int bit = response[i/8] & (1<<(i%8));
int bit = response & 1;
response = response >> 1;
if(bit)
AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT;
else
@ -49,20 +52,21 @@ static void frame_send(char *response, int num_bytes, int num_bits)
#endif
}
static void frame_respond(struct legic_frame *f)
static void frame_respond(struct legic_frame const * const f)
{
LED_D_ON();
int bitcount = f->num_bytes*8+f->num_bits;
int i, r=-1;
int i;
struct legic_frame *r = NULL;
for(i=0; i<sizeof(queries)/sizeof(queries[0]); i++) {
if(bitcount == queries[i][0] && f->data[0] == queries[i][1] && f->data[1] == queries[i][2]) {
r = i;
if(f->bits == queries[i].bits && f->data == queries[i].data) {
r = &responses[i];
break;
}
}
if(r != -1) {
frame_send(&responses[r][1], responses[r][0]/8, responses[r][0]%8);
if(r != NULL) {
frame_send(r->data, r->bits);
LED_A_ON();
} else {
LED_A_OFF();
@ -71,26 +75,22 @@ static void frame_respond(struct legic_frame *f)
LED_D_OFF();
}
static void frame_append_bit(struct legic_frame *f, int bit)
static void frame_append_bit(struct legic_frame * const f, int bit)
{
if(f->num_bytes >= (int)sizeof(f->data))
if(f->bits >= 15)
return; /* Overflow, won't happen */
f->data[f->num_bytes] |= (bit<<f->num_bits);
f->num_bits++;
if(f->num_bits > 7) {
f->num_bits = 0;
f->num_bytes++;
}
f->data |= (bit<<f->bits);
f->bits++;
}
static int frame_is_empty(struct legic_frame *f)
static int frame_is_empty(struct legic_frame const * const f)
{
return( (f->num_bytes*8 + f->num_bits) <= 4 );
return( f->bits <= 4 );
}
static void frame_handle(struct legic_frame *f)
static void frame_handle(struct legic_frame const * const f)
{
if(f->num_bytes == 0 && f->num_bits == 6) {
if(f->bits == 6) {
/* Short path */
return;
}
@ -99,13 +99,10 @@ static void frame_handle(struct legic_frame *f)
}
}
static void frame_clean(struct legic_frame *f)
static void frame_clean(struct legic_frame * const f)
{
if(!frame_is_empty(f))
/* memset(f->data, 0, sizeof(f->data)); */
f->data[0] = f->data[1] = 0;
f->num_bits = 0;
f->num_bytes = 0;
f->data = 0;
f->bits = 0;
}
static void emit(int bit)