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#include <avr/io.h>
#include <util/delay.h>
#include <util/setbaud.h>
#include "r503.h"
#define MAXPDLEN 64
#define RST_DELAY_MS 500
#define HEADER_HO 0xEF
#define HEADER_LO 0x01
#define ADDR 0xFFFFFFFF
#define OK 0x00
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 send(uint8_t pid, uint8_t *data, uint8_t n)
{
int i;
uint16_t pktlen, sum;
write(HEADER_HO);
write(HEADER_LO);
write((uint8_t)(ADDR >> 24));
write((uint8_t)(ADDR >> 16));
write((uint8_t)(ADDR >> 8));
write((uint8_t)(ADDR & 0xFF));
write(pid);
pktlen = n + 2;
write((uint8_t)(pktlen >> 8));
write((uint8_t)pktlen);
sum = (pktlen >> 8) + (pktlen & 0xFF) + pid;
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 != HEADER_HO)
continue;
break;
case 1:
if (byte != HEADER_LO)
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;
}
void fpm_led_on(COLOR color)
{
uint16_t n;
uint8_t buf[MAXPDLEN];
buf[0] = 0x35;
buf[1] = 0x03;
buf[2] = 0x00;
buf[3] = color;
buf[4] = 0x00;
send(0x01, buf, 5);
recv(buf, &n);
}
void fpm_led_off(void)
{
uint16_t n;
uint8_t buf[MAXPDLEN];
buf[0] = 0x35;
buf[1] = 0x04;
buf[2] = 0x00;
buf[3] = 0x00;
buf[4] = 0x00;
send(0x01, buf, 5);
recv(buf, &n);
}
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);
return check_pwd();
}
uint8_t fpm_clear_db(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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