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-rw-r--r--nrf24l01/Recv.Makefile43
-rw-r--r--nrf24l01/Send.Makefile44
-rw-r--r--nrf24l01/nrf24l01.c134
-rw-r--r--nrf24l01/radio.h19
-rw-r--r--nrf24l01/recv.c64
-rw-r--r--nrf24l01/send.c34
-rw-r--r--nrf24l01/uart.c33
-rw-r--r--nrf24l01/uart.h8
8 files changed, 379 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/nrf24l01.c b/nrf24l01/nrf24l01.c
new file mode 100644
index 0000000..3e92ac0
--- /dev/null
+++ b/nrf24l01/nrf24l01.c
@@ -0,0 +1,134 @@
+#include <stdlib.h>
+
+#include <avr/io.h>
+#include <util/delay.h>
+
+#include "radio.h"
+#include "uart.h"
+
+#define SPI_DDR DDRB
+#define SPI_PORT PORTB
+#define SPI_SS_PIN PB2
+#define SPI_SCK_PIN PB5
+#define SPI_MISO_PIN PB4
+#define SPI_MOSI_PIN PB3
+
+#define NRF24_CE PB0
+#define NRF24_CE_DDR DDRB
+#define NRF24_CE_PORT DDRB
+
+#define NRF24_POWER_ON_RST_DELAY 100
+
+#define NRF24_REG_CONFIG 0x00
+#define NRF24_REG_EN_AA 0x01
+#define NRF24_REG_EN_RXADDR 0x02
+#define NRF24_REG_SETUP_AW 0x03
+#define NRF24_REG_SETUP_RETR 0x04
+#define NRF24_REG_RF_CH 0x05
+#define NRF24_REG_RF_SETUP 0x06
+#define NRF24_REG_STATUS 0x07
+#define NRF24_REG_OBSERVE_TX 0x08
+#define NRF24_REG_RPD 0x09
+#define NRF24_REG_RX_ADDR_P0 0x0A
+#define NRF24_REG_RX_ADDR_P1 0x0B
+#define NRF24_REG_RX_ADDR_P2 0x0C
+#define NRF24_REG_RX_ADDR_P3 0x0D
+#define NRF24_REG_RX_ADDR_P4 0x0E
+#define NRF24_REG_RX_ADDR_P5 0x0F
+#define NRF24_REG_TX_ADDR 0x10
+#define NRF24_REG_RX_PW_P0 0x11
+#define NRF24_REG_RX_PW_P1 0x12
+#define NRF24_REG_RX_PW_P2 0x13
+#define NRF24_REG_RX_PW_P3 0x14
+#define NRF24_REG_RX_PW_P4 0x15
+#define NRF24_REG_RX_PW_P5 0x16
+#define NRF24_REG_FIFO_STATUS 0x17
+#define NRF24_REG_DYNPD 0x1C
+#define NRF24_REG_FEATURE 0x1D
+
+#define NRF24_NOP 0xFF
+#define NRF24_R_REGISTER 0x00
+#define NRF24_W_REGISTER 0x20
+#define NRF24_R_RX_PAYLOAD 0x60
+#define NRF24_W_TX_PAYLOAD 0xA0
+#define NRF24_FLUSH_TX 0xE1
+#define NRF24_FLUSH_RX 0xE2
+
+#define NRF24_MASK_RX_DR 6
+#define NRF24_MASK_TX_DS 5
+#define NRF24_MASK_MAX_RT 4
+#define NRF24_PWR_UP 1
+#define NRF24_PRIM_RX 0
+#define NRF24_ERX_P1 1
+#define NRF24_ERX_P0 0
+
+static inline uint8_t read_reg(uint8_t reg)
+{
+ SPI_PORT &= ~(1 << SPI_SS);
+ SPDR = NRF24_R_REGISTER | reg;
+ 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 = NRF24_W_REGISTER | reg;
+ 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 radio_recv(char *buf, uint8_t n)
+{
+}
+
+void radio_listen(void)
+{
+}
+
+void radio_init(const struct radio_cfg *cfg)
+{
+ uint8_t conf;
+
+ SPI_DDR |= (1 << SPI_SS) | (1 << S2PI_SCK) | (1 << SPI_MOSI);
+ SPI_PORT |= (1 << SPI_SS);
+ SPCR |= (1 << SPE) | (1 << MSTR);
+
+ NRF24_CE_DDR |= (1 << NRF24_CE);
+ NRF24_CE_PORT &= ~(1 << NRF24_CE);
+
+ _delay_ms(NRF24_POWER_ON_RST_DELAY);
+
+ // disable IRQs, set CRC encoding scheme to 2 bytes
+ conf = 0;
+ conf |= (1 << NRF24_MASK_RX_DR);
+ conf |= (1 << NRF24_MASK_TX_DS);
+ conf |= (1 << NRF24_MASK_MAX_RT);
+ conf |= (1 << NRF24_CRCO);
+ write_reg(NRF24_REG_CONFIG, conf);
+
+ // only use data pipe 0
+ conf = 0;
+ conf &= ~(1 << NRF24_ERX_P1);
+ conf |= (1 << NRF24_ERX_P0);
+ write_reg(NRF24_REG_EN_RXADDR, conf);
+
+ // set address width to 3 bytes
+ write_reg(NRF24_REG_SETUP_AW, 0x01);
+
+ conf = 0;
+ conf =
+}
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/uart.c b/nrf24l01/uart.c
new file mode 100644
index 0000000..e5b6e05
--- /dev/null
+++ b/nrf24l01/uart.c
@@ -0,0 +1,33 @@
+#include <avr/io.h>
+#include <util/setbaud.h>
+
+#include "uart.h"
+
+void uart_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 uart_write(char c)
+{
+ while (!(UCSR0A & (1 << UDRE0)))
+ ;
+ UDR0 = data;
+}
+
+void uart_write_line(const char *s)
+{
+ for (; *s; s++)
+ serial_write(*s);
+
+ serial_write('\r');
+ serial_write('\n');
+}
diff --git a/nrf24l01/uart.h b/nrf24l01/uart.h
new file mode 100644
index 0000000..81db74b
--- /dev/null
+++ b/nrf24l01/uart.h
@@ -0,0 +1,8 @@
+#ifndef UART_H
+#define UART_H
+
+void uart_init(void);
+void uart_write(char c);
+void uart_write_line(const char *s);
+
+#endif /* UART_H */