5 files changed, 113 insertions, 13 deletions
diff --git a/rf_test/rfm.c b/rf_test/rfm.c
new file mode 100644
index 0000000..1b88773
--- /dev/null
+++ b/rf_test/rfm.c
@@ -0,0 +1,41 @@
+#include "rfm.h"
+#include "spi.h"
+
+#define READ_MASK  0x7F
+#define WRITE_MASK 0x80
+
+static inline void send_cmd(uint8_t addr, uint8_t val)
+{
+	uint8_t ra, wa;
+
+	ra = addr | READ_MASK;
+	wa = addr | WRITE_MASK; 
+
+	while (spi_recv(ra) != val)
+		spi_send(wa, val);
+}
+
+void rfm_init(uint8_t addr)
+{
+	spi_init();
+
+	// mode: standby + packet
+	send_cmd(0x01, 0x44);
+
+	// rx interrupt on DPIO0
+	send_cmd(0x25, 0x40);
+	send_cmd(0x26, 0x07);
+
+	// packet format: 8 bits + whitening + crc + addr filtering
+	send_cmd(0x37, 0x52);
+	send_cmd(0x38, 0x08);
+	send_cmd(0x38, addr);
+
+	// disable encryption
+	send_cmd(0x3D, 0x02);
+}
+
+void rfm_send(uint8_t addr, uint8_t data)
+{
+	
+}
diff --git a/rf_test/rfm.h b/rf_test/rfm.h
new file mode 100644
index 0000000..d74dff7
--- /dev/null
+++ b/rf_test/rfm.h
@@ -0,0 +1,10 @@
+#ifndef RFM69_H
+#define RFM69_H
+
+#include <stdint.h>
+
+void rfm_init(void);
+
+void rfm_send(uint8_t addr, uint8_t data);
+
+#endif /* RFM69_H */
diff --git a/rf_test/send.c b/rf_test/send.c
index 370a6f4..d0a27c7 100644
--- a/rf_test/send.c
+++ b/rf_test/send.c
@@ -2,6 +2,8 @@
 #include <avr/interrupt.h>
 #include <util/delay.h>
 
+#include "spi.h"
+
 #define LOCK_BTN    PD6
 #define UNLOCK_BTN  PD7
 
@@ -9,19 +11,6 @@
 #define LOCK   0xB5
 #define UNLOCK 0xAE
 
-static inline void spi_init(void)
-{
-	DDR_SPI = (1 << DD_MOSI) | (1 << DD_SCK);
-	SPCR = (1 << SPE) | (1 << MSTR) | (1 << SPR0);
-}
-
-static inline void spi_send(unsigned char data)
-{
-	SPRD = data;
-	while (!(SPSR & (1 << SPIF)))
-		;
-}
-
 static inline void lock(void)
 {
 	spi_send(SYN);
diff --git a/rf_test/spi.c b/rf_test/spi.c
new file mode 100644
index 0000000..282cdce
--- /dev/null
+++ b/rf_test/spi.c
@@ -0,0 +1,48 @@
+#include <avr/io.h>
+
+#include "spi.h"
+
+#define SS_PIN   PB2
+#define SS_DDR   DDRB
+#define SS_PORT  PORTB
+
+void spi_init(void)
+{
+	SS_DDR |= (1 << SS_PIN);
+	SS_PORT |= (1 << SS_PIN);
+
+	DDR_SPI = (1 << DD_MOSI) | (1 << DD_SCK);
+	SPCR    = (1 << SPE) | (1 << MSTR) | (1 << SPR0);
+}
+
+uint8_t spi_send(uint8_t data)
+{
+	SS_PORT |= (1 << SS_PIN);
+
+	SPDR = data;
+	while (!(SPSR & (1 << SPIF)))
+		;
+	data = SPDR;
+
+	SS_PORT &= ~(1 << SS_PIN);
+
+	return data;
+}
+
+uint8_t spi_send(uint8_t addr, uint8_t data)
+{
+	SS_PORT |= (1 << SS_PIN);
+
+	SPDR = addr;
+	while (!(SPSR & (1 << SPIF)))
+		;
+
+	SPDR = data;
+	while (!(SPSR & (1 << SPIF)))
+		;
+
+	SS_PORT &= ~(1 << SS_PIN);
+
+	return data;
+}
+
diff --git a/rf_test/spi.h b/rf_test/spi.h
new file mode 100644
index 0000000..220c08f
--- /dev/null
+++ b/rf_test/spi.h
@@ -0,0 +1,12 @@
+#ifndef SPI_H
+#define SPI_H
+
+#include <stdint.h>
+
+void spi_init(void);
+
+uint8_t spi_recv(uint8_t addr);
+
+uint8_t spi_send(uint8_t addr, data);
+
+#endif /* SPI_H */