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David Westgate
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README.md
31
README.md
@ -4,8 +4,10 @@ A multi-function application designed to run on a pi node. When used in a mesh n
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The implementation here uses CC2500 register values which intend to mimic my [Girafus M07A](https://www.girafus.com/en-en/collections/peilsender/products/ersatzteil-basismodul-fur-girafus%C2%AE-pro-track-tor-katzen-hunde-haustier-kleintier-sucher) unit. This unit is paired with my associated [tracker](https://www.girafus.com/en-en/collections/peilsender/products/extra-sender-tag-fur-den-girafus%C2%AE-pro-track-tor-haustier-hund-katze-kleintier-finder-sucher-ortung)
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## CC2500 datasheet
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[cc2500.pdf](./cc2500.pdf)
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## Links
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* [Arduion Forum Port](https://forum.arduino.cc/t/replicating-a-signal-from-a-locating-device-2-4ghz-to-locate-tag/321993/2)
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* [cc2500 data sheet](./cc2500.pdf)
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* [C Code transciever example](https://github.com/alexbirkett/cc2500-raspberry-pi)
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## CC2500 to Raspberry Pi GPIO Pin Mapping
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@ -73,21 +75,38 @@ The known frequency range is 2400 – 2483.5 MHz, and my SDR has a 20 MHZ bandwi
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| 3 | 2450 MHz | 2,450,000 kHz | 2440 – 2460 MHz | 2,440,000 – 2,460,000 kHz |
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| 4 | 2470 MHz | 2,470,000 kHz | 2460 – 2480 MHz | 2,460,000 – 2,480,000 kHz |
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| 5 | 2483.5 MHz | 2,483,500 kHz | 2473.5 – 2483.5 MHz | 2,473,500 – 2,483,500 kHz |
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#### Signal 00
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2.423257000 GHz | 2423.257000 MHz | 2423257.000 kHz |
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#### Signal 0
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2.431258000 GHz | 2431258.000 kHz
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2.431258000 GHz | 2431.258000 MHz| 2431258.000 kHz
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#### Signal 1
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2.447257000 GHz | 2447257.000 kHz
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2.447257000 GHz | 2447.257000 MHz | 2447257.000 kHz
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#### Signal 2
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2.450225000 GHz | 2450225.000 kHz
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2.450225000 GHz | 2450.225000 MHz | 2450225.000 kHz
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#### Signal 3
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2.471275000 GHz | 2471275.000 kHz
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2.471275000 GHz | 2471.275000 MHz | 2471275.000 kHz
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#### Signal Summary
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🧩 Final Answer
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Base frequency: 2431258 kHz
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Channel spacing: 500 kHz
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Signal channels:
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Signal 0 → Channel 0
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Signal 1 → Channel 16
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Signal 2 → Channel 18
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Signal 3 → Channel 40
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## Run
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@ -1,15 +1,12 @@
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{
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"IOCFG2" : { "hex":"0x0B", "dec":11},
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"IOCFG0" : { "hex":"0x0C", "dec":12},
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"PKTCTRL0": { "hex":"0x12", "dec":18},
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"CHANNR" : { "hex":"0x7D", "dec":125},
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"IOCFG0" : { "hex":"0x06", "dec":6},
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"PKTCTRL0": { "hex":"0x05", "dec":5},
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"FSCTRL1" : { "hex":"0x0A", "dec":10},
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"FREQ2" : { "hex":"0x5C", "dec":92},
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"FREQ1" : { "hex":"0x4E", "dec":78},
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"FREQ0" : { "hex":"0xC4", "dec":196},
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"FREQ1" : { "hex":"0x20", "dec":32},
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"FREQ0" : { "hex":"0x11", "dec":17},
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"MDMCFG4" : { "hex":"0x2D", "dec":45},
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"MDMCFG3" : { "hex":"0x3B", "dec":59},
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"MDMCFG2" : { "hex":"0x70", "dec":112},
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"MDMCFG2" : { "hex":"0x73", "dec":115},
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"DEVIATN" : { "hex":"0x00", "dec":0},
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"MCSM0" : { "hex":"0x18", "dec":24},
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"FOCCFG" : { "hex":"0x1D", "dec":29},
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2
freq.txt
2
freq.txt
@ -1,6 +1,6 @@
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Handheld Init
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2.4312 GHZ (mid)
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2.439 (strong)
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2.439256 (strong)
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2.447 GHZ (strong)
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2.4632 GHZ (strong)
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2.471 GHZ (weak)
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BIN
images/signals/signal00.png
Normal file
BIN
images/signals/signal00.png
Normal file
Binary file not shown.
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After Width: | Height: | Size: 410 KiB |
27
read.py
27
read.py
@ -35,6 +35,13 @@ def burst_read(addr, length):
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READ_BURST = ACCESS["READ_BURST"]["dec"]
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return spi.xfer2([addr | READ_SINGLE | READ_BURST] + [0x00] * length)
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def read_fifo():
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# Burst read RX FIFO
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READ_BURST = ACCESS["READ_BURST"]["dec"]
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RXFIFO = MEMORY["RXFIFI"]["dec"]
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fifo = spi.xfer2([RXFIFO | READ_BURST] + [0x00]*64) # Max 64 bytes
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return fifo[1:]
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def read_register(addr):
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READ_SINGLE = ACCESS["READ_SINGLE"]["dec"]
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@ -65,7 +72,7 @@ def receive_packet():
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strobe(SRX) # SRX
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# Wait for data (use GDO0 in real app)
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time.sleep(0.1)
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time.sleep(0.5)
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# Check RXBYTES
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RXBYTES = STATUS["RXBYTES"]["dec"]
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@ -76,7 +83,7 @@ def receive_packet():
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# Read data
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RXFIFO = MEMORY["RXFIFO"]["dec"]
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data = burst_read(RXFIFO, rx_bytes) # 0x3F = RX FIFO
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data = read_fifo() # 0x3F = RX FIFO
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print(f"Received: {data}")
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return data
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@ -93,6 +100,16 @@ def test_read_write_reg():
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print("check ",check)
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return check == test_value
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def disable_crc():
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spi.xfer2([CONFIG_REGS["PKTCTRL0"]["dec"], 0x01])
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def dump_reg():
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for reg_name_group, regs in regs_data.items():
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for reg_name, reg_loc in regs.items():
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addr = reg_loc['dec']
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reg_value = read_register(addr)
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print(reg_name + ":"+str(reg_value))
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if __name__ == "__main__":
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spi = spidev.SpiDev()
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spi.open(0, 0) # Bus 0, CE0 (Pin 24)
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@ -124,9 +141,10 @@ if __name__ == "__main__":
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print(f"Status byte: 0x{status:02X}")
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print("Reading VERSION register...")
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version = read_register(0x31)
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version = read_register(VERSION)
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print(f"CC2500 VERSION register: 0x{version:02X}")
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# dump_reg()
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for reg_name, values in init_data.items():
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addr_dec = regs_data["CONFIG_REGS"][reg_name]["dec"]
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@ -137,6 +155,9 @@ if __name__ == "__main__":
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# print(values["hex"])
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# print("writing "+str(addr_hex) + " to "+str(addr_dec))
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write_reg(addr_dec, value_dec)
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disable_crc()
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time.sleep(2)
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# dump_reg()
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print("Read + Write test ", test_read_write_reg())
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try:
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while True:
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