1 files changed, 63 insertions, 0 deletions
diff --git a/lock/fpm.c b/lock/fpm.c
new file mode 100644
index 0000000..814119f
--- /dev/null
+++ b/lock/fpm.c
@@ -0,0 +1,63 @@
+#include <avr/io.h>
+#include <util/setbaud.h>
+
+#include "fpm.h"
+
+static uint8_t start_code[] = { 0xEF, 0x01 };
+static uint8_t addr[] = { 0xFF, 0xFF, 0xFF, 0xFF };
+
+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;
+
+	pktlen = n + 2;
+
+	write_bulk(start_code, 2);
+	write_bulk(addr, 4);
+	write(pktid);
+	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);
+}
+
+void 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);
+}
+
+void fpm_print_config(void)
+{
+}
+