Start work on nRF24L01.

8 files changed, 387 insertions, 0 deletions

diff --git a/nRF24L01/Recv.Makefile b/nRF24L01/Recv.Makefile
new file mode 100644
index 0000000..67ac41f
--- /dev/null
+++ b/nRF24L01/Recv.Makefile
@@ -0,0 +1,43 @@
+CC = avr-gcc
+MCU = atmega328p
+TARGET = recv
+
+SRC = radio.c recv.c serial.c
+OBJ = $(SRC:.c=.o)
+
+CFLAGS = -std=gnu99
+CFLAGS += -Os
+CFLAGS += -Wall
+CFLAGS += -mmcu=$(MCU)
+CFLAGS += -DBAUD=115200
+CFLAGS += -DF_CPU=16000000UL
+CFLAGS += -ffunction-sections -fdata-sections
+
+LDFLAGS = -mmcu=$(MCU)
+LDFLAGS += -Wl,--gc-sections
+
+HEX_FLAGS = -O ihex
+HEX_FLAGS += -j .text -j .data
+
+AVRDUDE_FLAGS = -p $(MCU)
+AVRDUDE_FLAGS += -c arduino
+AVRDUDE_FLAGS += -P /dev/cuaU0
+AVRDUDE_FLAGS += -D -U
+
+%.o: %.c
+	 $(CC) $(CFLAGS) -c -o $@ $<
+
+elf: $(OBJ)
+	 $(CC) $(LDFLAGS) $(OBJ) -o $(TARGET).elf
+
+hex: elf
+	 avr-objcopy $(HEX_FLAGS) $(TARGET).elf $(TARGET).hex
+
+upload: hex
+	 avrdude $(AVRDUDE_FLAGS) flash:w:$(TARGET).hex:i
+
+.PHONY: clean
+
+clean:
+	 rm *.o *.elf *.hex 
+
diff --git a/nRF24L01/Send.Makefile b/nRF24L01/Send.Makefile
new file mode 100644
index 0000000..06e083b
--- /dev/null
+++ b/nRF24L01/Send.Makefile
@@ -0,0 +1,44 @@
+CC = avr-gcc
+MCU = atmega328p
+TARGET = send
+
+SRC = radio.c send.c serial.c
+OBJ = $(SRC:.c=.o)
+
+CFLAGS = -std=gnu99
+CFLAGS += -Os
+CFLAGS += -Wall
+CFLAGS += -mmcu=$(MCU)
+CFLAGS += -DBAUD=115200
+CFLAGS += -DF_CPU=16000000UL
+CFLAGS += -ffunction-sections -fdata-sections
+
+LDFLAGS = -mmcu=$(MCU)
+LDFLAGS += -Wl,--gc-sections
+
+HEX_FLAGS = -O ihex
+HEX_FLAGS += -j .text -j .data
+
+AVRDUDE_FLAGS = -p $(MCU)
+AVRDUDE_FLAGS += -c arduino
+AVRDUDE_FLAGS += -P /dev/cuaU0
+AVRDUDE_FLAGS += -D -U
+
+%.o: %.c
+	 $(CC) $(CFLAGS) -c -o $@ $<
+
+elf: $(OBJ)
+	 $(CC) $(LDFLAGS) $(OBJ) -o $(TARGET).elf
+
+hex: elf
+	 avr-objcopy $(HEX_FLAGS) $(TARGET).elf $(TARGET).hex
+
+upload: hex
+	 avrdude $(AVRDUDE_FLAGS) flash:w:$(TARGET).hex:i
+
+.PHONY: clean
+
+clean:
+	 rm *.o *.elf *.hex 
+
+
diff --git a/nRF24L01/radio.c b/nRF24L01/radio.c
new file mode 100644
index 0000000..88e0c51
--- /dev/null
+++ b/nRF24L01/radio.c
@@ -0,0 +1,142 @@
+#include <stdlib.h>
+
+#include <avr/io.h>
+#include <util/delay.h>
+
+#include "radio.h"
+#include "serial.h"
+
+#define SPI_SS     PB2
+#define SPI_SCK    PB5
+#define SPI_MISO   PB4
+#define SPI_MOSI   PB3
+#define SPI_DDR    DDRB
+#define SPI_PORT   PORTB
+
+#define NRF24L01_CE       PB0
+#define NRF24L01_CE_DDR   DDRB
+#define NRF24L01_CE_PORT  DDRB
+
+#define NRF24L01_REG_CONFIG        0x00
+#define NRF24L01_REG_EN_AA         0x01
+#define NRF24L01_REG_EN_RXADDR     0x02
+#define NRF24L01_REG_SETUP_AW      0x00
+#define NRF24L01_REG_SETUP_RETR    0x00
+#define NRF24L01_REG_RF_CH         0x00
+#define NRF24L01_REG_RF_SETUP      0x00
+#define NRF24L01_REG_STATUS        0x00
+#define NRF24L01_REG_OBSERVE_TX    0x00
+#define NRF24L01_REG_RPD           0x00
+#define NRF24L01_REG_RX_ADDR_P0    0x00
+#define NRF24L01_REG_RX_ADDR_P1    0x00
+#define NRF24L01_REG_RX_ADDR_P2    0x00
+#define NRF24L01_REG_RX_ADDR_P3    0x00
+#define NRF24L01_REG_RX_ADDR_P4    0x00
+#define NRF24L01_REG_RX_ADDR_P5    0x00
+#define NRF24L01_REG_TX_ADDR       0x00
+#define NRF24L01_REG_RX_PW_P0      0x00
+#define NRF24L01_REG_RX_PW_P1      0x00
+#define NRF24L01_REG_RX_PW_P2      0x00
+#define NRF24L01_REG_RX_PW_P3      0x00
+#define NRF24L01_REG_RX_PW_P4      0x00
+#define NRF24L01_REG_RX_PW_P5      0x00
+#define NRF24L01_REG_FIFO_STATUS   0x00
+#define NRF24L01_REG_DYNPD         0x00
+#define NRF24L01_REG_FEATURE       0x00
+
+static inline uint8_t read_reg(uint8_t reg)
+{
+	SPI_PORT &= ~(1 << SPI_SS);
+	SPDR = reg & 0x7F;
+	while (!(SPSR & (1 << SPIF)))
+		;
+	SPDR = 0;
+	while (!(SPSR & (1 << SPIF)))
+		;
+	SPI_PORT |= (1 << SPI_SS);
+	return SPDR;
+}
+
+static inline void write_reg(uint8_t reg, uint8_t val)
+{
+	SPI_PORT &= ~(1 << SPI_SS);
+	SPDR = reg | 0x80;
+	while (!(SPSR & (1 << SPIF)))
+		;
+	SPDR = val;
+	while (!(SPSR & (1 << SPIF)))
+		;
+	SPI_PORT |= (1 << SPI_SS);
+}
+
+void radio_send(const char *data, uint8_t n)
+{
+	uint8_t i, mode;
+
+	mode = opmode;
+	set_mode(RF69_OPMODE_STDBY);
+
+	SPI_PORT &= ~(1 << SPI_SS);
+
+	SPDR = RF69_REG_FIFO | 0x80;
+	while (!(SPSR & (1 << SPIF)))
+		;
+
+	for (i = 0; i < n; i++) {
+		SPDR = data[i];
+		while (!(SPSR & (1 << SPIF)))
+			;
+	}
+
+	SPI_PORT |= (1 << SPI_SS);
+
+	set_mode(RF69_OPMODE_TX);
+	while (!(read_reg(RF69_REG_IRQFLAGS2) & 0x08))
+		;
+
+	set_mode(mode);
+}
+
+uint8_t radio_recv(char *buf, uint8_t n)
+{
+	uint8_t read_len, mode;
+
+	read_len = 0;
+	mode = opmode;
+
+	set_mode(RF69_OPMODE_STDBY);
+
+	SPI_PORT &= ~(1 << SPI_SS);
+
+	SPDR = RF69_REG_FIFO | 0x7F;
+	while (!(SPSR & (1 << SPIF)))
+		;
+
+	while (read_len < n) {
+		SPDR = 0;		
+		while (!(SPSR & (1 << SPIF)))
+			;
+		buf[read_len++] = SPDR;
+	}
+
+	SPI_PORT |= (1 << SPI_SS);
+
+	set_mode(mode);
+	return read_len;
+}
+
+void radio_listen(void)
+{
+}
+
+void radio_init(const struct radio_cfg *cfg)
+{
+	SPI_DDR |= (1 << SPI_SS) | (1 << SPI_SCK) | (1 << SPI_MOSI);
+	SPI_PORT |= (1 << SPI_SS);
+	SPCR |= (1 << SPE) | (1 << MSTR);
+
+	NRF24L01_CE_DDR |= (1 << NRF24L01_CE);
+	NRF24L01_CE_PORT &= ~(1 << NRF24L01_CE);
+
+	_delay_ms(100);
+}
diff --git a/nRF24L01/radio.h b/nRF24L01/radio.h
new file mode 100644
index 0000000..a44d67e
--- /dev/null
+++ b/nRF24L01/radio.h
@@ -0,0 +1,19 @@
+#ifndef RADIO_H
+#define RADIO_H
+
+#include <stdint.h>
+
+struct radio_cfg {
+	uint8_t netid;
+	uint8_t nodeid;
+};
+
+void radio_init(const struct radio_cfg *cfg);
+
+void radio_listen(void);
+
+void radio_send(const char *data, uint8_t n);
+
+uint8_t radio_recv(char *buf, uint8_t n);
+
+#endif
diff --git a/nRF24L01/recv.c b/nRF24L01/recv.c
new file mode 100644
index 0000000..1c6ac0f
--- /dev/null
+++ b/nRF24L01/recv.c
@@ -0,0 +1,64 @@
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+#include "radio.h"
+#include "serial.h"
+
+#define RX_PIN         PD7
+#define RX_DDR         DDRD
+#define RX_PORT        PORTD
+#define RX_PCIE        PCIE2
+#define RX_PCINT       PCINT23
+#define RX_PCMSK       PCMSK2
+#define RX_PCINTVEC    PCINT2_vect
+
+#define MAX_PAYLOAD_LEN 60
+
+static char *s = "hello, world!";
+static uint8_t slen = 13;
+
+int main(void)
+{
+	struct radio_cfg cfg;
+
+	cfg.netid = 0x01;
+	cfg.nodeid = 0x01;
+	cfg.payload_len = slen;
+
+	RX_DDR &= ~(1 << RX_PIN);
+	RX_PORT &= ~(1 << RX_PIN); 
+	PCICR |= (1 << RX_PCIE);
+	RX_PCMSK |= (1 << RX_PCINT);
+
+	serial_init();
+
+	radio_init(&cfg);
+	radio_listen();
+
+	sei();
+
+	for (;;)
+		;
+
+	return 0;
+}
+
+ISR(RX_PCINTVEC)
+{
+	uint8_t i, n;
+	char buf[MAX_PAYLOAD_LEN];
+
+	cli();
+
+	serial_write_line("Detected pin change IRQ");
+
+	n = radio_recv(buf, MAX_PAYLOAD_LEN - 1);
+	buf[n] = '\0';
+	
+	for (i = 0; i < n; i++)
+		serial_write(buf[i]);
+	serial_write('\r');
+	serial_write('\n');
+
+	sei();
+}
diff --git a/nRF24L01/send.c b/nRF24L01/send.c
new file mode 100644
index 0000000..b390cf3
--- /dev/null
+++ b/nRF24L01/send.c
@@ -0,0 +1,34 @@
+#include <stdlib.h>
+#include <string.h>
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+
+#include "radio.h"
+#include "serial.h"
+
+int main(void)
+{
+	uint8_t n;
+	struct radio_cfg cfg;
+	const char *s = "hello, world!";
+
+	n = strlen(s);
+
+	cfg.netid = 0x01;
+	cfg.nodeid = 0x02;
+	cfg.payload_len = n;
+
+	serial_init();
+	radio_init(&cfg);
+	radio_set_tx_power(18);
+
+	for (;;) {
+		radio_send(s, n);
+		serial_write_line("sent");
+		_delay_ms(1500);
+	}
+
+	return 0;
+}
diff --git a/nRF24L01/serial.c b/nRF24L01/serial.c
new file mode 100644
index 0000000..782e848
--- /dev/null
+++ b/nRF24L01/serial.c
@@ -0,0 +1,33 @@
+#include <avr/io.h>
+#include <util/setbaud.h>
+
+#include "serial.h"
+
+void serial_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 serial_write(char data)
+{
+	while (!(UCSR0A & (1 << UDRE0)))
+		;
+	UDR0 = data;
+}
+
+void serial_write_line(const char *s)
+{
+	for (; *s; s++)
+		serial_write(*s);
+
+	serial_write('\r');
+	serial_write('\n');
+}
diff --git a/nRF24L01/serial.h b/nRF24L01/serial.h
new file mode 100644
index 0000000..0f9415b
--- /dev/null
+++ b/nRF24L01/serial.h
@@ -0,0 +1,8 @@
+#ifndef SA_SERIAL_H
+#define SA_SERIAL_H
+
+void serial_init(void);
+void serial_write(char data);
+void serial_write_line(const char *s);
+
+#endif /* SA_SERIAL_H */