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#include <avr/io.h>
#include <util/delay.h>
#include <util/setbaud.h>
#include "fpm.h"
#define MAXPDLEN 64
#define RST_DELAY_MS 500
#define OK 0x00
static uint8_t start_code[] = { 0xEF, 0x01 };
static uint8_t addr[] = { 0xFF, 0xFF, 0xFF, 0xFF };
static inline uint8_t read(void)
{
while (!(UCSR0A & (1 << RXC0)))
;
return UDR0;
}
static inline void write(uint8_t c)
{
while (!(UCSR0A & (1 << UDRE0)))
;
UDR0 = c;
}
static inline void write_bulk(uint8_t *data, uint16_t n)
{
int i;
for (i = 0; i < n; i++)
write(data[i]);
}
static inline void send(uint8_t pktid, uint8_t *data, uint8_t n)
{
int i;
uint16_t pktlen, sum;
write_bulk(start_code, 2);
write_bulk(addr, 4);
write(pktid);
pktlen = n + 3;
write((uint8_t)(pktlen >> 8));
write((uint8_t)pktlen);
sum = (pktlen >> 8) + (pktlen & 0xFF) + pktid;
for (i = 0; i < n; i++) {
write(data[i]);
sum += data[i];
}
write((uint8_t)(sum >> 8));
write((uint8_t)sum);
}
static inline void recv(uint8_t buf[MAXPDLEN], uint16_t *n)
{
int i;
uint16_t len;
uint8_t byte;
i = 0, len = 0;
for (;;) {
byte = read();
switch (i) {
case 0:
if (byte != start_code[0])
continue;
break;
case 1:
if (byte != start_code[1])
goto bad_pkt;
break;
case 2:
case 3:
case 4:
case 5:
// toss the address
break;
case 6:
// toss the packet id
break;
case 7:
len = (uint16_t)byte << 8;
break;
case 8:
len |= byte;
break;
default:
if ((i - 9) < MAXPDLEN) {
buf[i - 9] = byte;
if ((i - 8) == len) {
*n = len;
return;
}
} else {
goto bad_pkt;
}
break;
}
i++;
}
bad_pkt:
*n = 0;
return;
}
static inline uint8_t check_pwd(void)
{
unsigned int n;
uint8_t buf[MAXPDLEN];
buf[0] = 0x13;
buf[1] = (uint8_t)((uint32_t)FPM_PWD >> 24);
buf[2] = (uint8_t)((uint32_t)FPM_PWD >> 16);
buf[3] = (uint8_t)((uint32_t)FPM_PWD >> 8);
buf[4] = (uint8_t)((uint32_t)FPM_PWD & 0xFF);
send(0x01, buf, 5);
recv(buf, &n);
return buf[0] == OK;
}
uint8_t fpm_init(void)
{
UBRR0H = UBRRH_VALUE;
UBRR0L = UBRRL_VALUE;
#if USE_2X
UCSR0A |= (1 << U2X0);
#else
UCSR0A &= ~(1 << U2X0);
#endif
UCSR0B = (1 << TXEN0) | (1 << RXEN0);
UCSR0C = (1 << UCSZ01) | (1 << UCSZ00);
_delay_ms(RST_DELAY_MS);
uint8_t buf[5];
buf[0] = 0x35;
buf[1] = 0x03;
buf[2] = 0x00;
buf[3] = 0x01;
buf[4] = 0x00;
send(0x01, buf, 5);
return check_pwd();
}
uint8_t fpm_getcfg(struct fpm_cfg *cfg)
{
uint16_t n;
uint8_t buf[MAXPDLEN];
buf[0] = 0x0F;
send(0x01, buf, 1);
recv(buf, &n);
if (buf[0] == OK && n >= 17) {
cfg->status = ((uint16_t)buf[1] << 8) | buf[2];
cfg->sysid = ((uint16_t)buf[3] << 8) | buf[4];
cfg->cap = ((uint16_t)buf[5] << 8) | buf[6];
cfg->sec_level = ((uint16_t)buf[7] << 8) | buf[8];
cfg->addr[0] = buf[9];
cfg->addr[1] = buf[10];
cfg->addr[2] = buf[11];
cfg->addr[3] = buf[12];
cfg->pkt_size = ((uint16_t)buf[13] << 8) | buf[14];
cfg->pkt_size = 1 << (cfg->pkt_size + 5);
cfg->baud = (((uint16_t)buf[15] << 8) | buf[16]);
return 1;
}
return 0;
}
uint8_t fpm_setpwd(uint32_t pwd)
{
uint16_t n;
uint8_t buf[MAXPDLEN];
buf[0] = 0x12;
buf[1] = (uint8_t)(pwd >> 24);
buf[2] = (uint8_t)(pwd >> 16);
buf[3] = (uint8_t)(pwd >> 8);
buf[4] = (uint8_t)(pwd & 0xFF);
send(0x01, buf, 5);
recv(buf, &n);
return buf[0] == OK;
}
uint16_t fpm_get_count(void)
{
uint16_t n, count;
uint8_t buf[MAXPDLEN];
buf[0] = 0x1D;
send(0x01, buf, 1);
recv(buf, &n);
count = 0;
if (buf[0] == OK && n >= 2) {
count = buf[1];
count <<= 8;
count |= buf[2];
}
return count;
}
uint8_t fpm_enroll(void)
{
uint16_t n, retries;
uint8_t buf[MAXPDLEN];
retries = 0;
do {
_delay_ms(100);
buf[0] = 0x10;
send(0x01, buf, 1);
recv(buf, &n);
retries++;
} while (buf[0] != OK && retries < 50);
return buf[0] == OK;
}
uint8_t fpm_match(void)
{
uint16_t n, retries;
uint8_t buf[MAXPDLEN];
retries = 0;
do {
_delay_ms(100);
buf[0] = 0x11;
send(0x01, buf, 1);
recv(buf, &n);
retries++;
} while (buf[0] != OK && retries < 10);
return buf[0] == OK;
}
uint8_t fpm_delete_all(void)
{
uint16_t n;
uint8_t buf[MAXPDLEN];
buf[0] = 0x0D;
send(0x01, buf, 1);
recv(buf, &n);
return buf[0] == OK;
}
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