# test1.py 26/09/2015 D.J.Whale
#
# Simple low level test of the HopeRF interface
# Uses direct SPI commands to exercise the interface.
#
# Receives and dumps payload buffers.
#
# Eventually a lot of this will be pushed into a separate module,
# and then pushed back into C once it is proved working.
import spi
def warning(msg):
print("warning:" + str(msg))
def trace(msg):
pass #print(str(msg))
#----- REGISTER ACCESS --------------------------------------------------------
def HRF_writereg(addr, data):
"""Write an 8 bit value to a register"""
buf = [addr | MASK_WRITE_DATA, data]
spi.select()
spi.frame(buf)
spi.deselect()
def HRF_readreg(addr):
"""Read an 8 bit value from a register"""
buf = [addr, 0x00]
spi.select()
res = spi.frame(buf)
spi.deselect()
#print(hex(res[1]))
return res[1] # all registers are 8 bit
def HRF_writefifo_burst(buf):
"""Write all bytes in buf to the payload FIFO, in a single burst"""
spi.select()
buf.insert(0, ADDR_FIFO | MASK_WRITE_DATA)
spi.frame(buf)
spi.deselect()
def ashex(buf):
result = []
for b in buf:
result.append(hex(b))
return result
def HRF_readfifo_burst():
"""Read bytes from the payload FIFO using burst read"""
#first byte read is the length in remaining bytes
buf = []
spi.select()
spi.frame([ADDR_FIFO])
count = 1 # read at least the length byte
while count > 0:
rx = spi.frame([ADDR_FIFO])
data = rx[0]
if len(buf) == 0:
count = data
else:
count -= 1
buf.append(data)
spi.deselect()
trace("readfifo:" + str(ashex(buf)))
return buf
def HRF_checkreg(addr, mask, value):
"""Check to see if a register matches a specific value or not"""
regval = HRF_readreg(addr)
#print("addr %d mask %d wanted %d actual %d" % (addr,mask,value,regval))
return (regval & mask) == value
def HRF_pollreg(addr, mask, value):
"""Poll a register until it meet some criteria"""
while not HRF_checkreg(addr, mask, value):
pass
#----- HRF REGISTER PROTOCOL --------------------------------------------------
# HopeRF register addresses
# Precise register description can be found on:
# www.hoperf.com/upload/rf/RFM69W-V1.3.pdf
# on page 63 - 74
ADDR_FIFO = 0x00
ADDR_OPMODE = 0x01
ADDR_REGDATAMODUL = 0x02
ADDR_BITRATEMSB = 0x03
ADDR_BITRATELSB = 0x04
ADDR_FDEVMSB = 0x05
ADDR_FDEVLSB = 0x06
ADDR_FRMSB = 0x07
ADDR_FRMID = 0x08
ADDR_FRLSB = 0x09
ADDR_AFCCTRL = 0x0B
ADDR_LNA = 0x18
ADDR_RXBW = 0x19
ADDR_AFCFEI = 0x1E
ADDR_IRQFLAGS1 = 0x27
ADDR_IRQFLAGS2 = 0x28
ADDR_RSSITHRESH = 0x29
ADDR_PREAMBLELSB = 0x2D
ADDR_SYNCCONFIG = 0x2E
ADDR_SYNCVALUE1 = 0x2F
ADDR_SYNCVALUE2 = 0x30
ADDR_SYNCVALUE3 = 0x31
ADDR_SYNCVALUE4 = 0x32
ADDR_PACKETCONFIG1 = 0x37
ADDR_PAYLOADLEN = 0x38
ADDR_NODEADDRESS = 0x39
ADDR_FIFOTHRESH = 0x3C
# HopeRF masks to set and clear bits
MASK_REGDATAMODUL_OOK = 0x08
MASK_REGDATAMODUL_FSK = 0x00
MASK_WRITE_DATA = 0x80
MASK_MODEREADY = 0x80
MASK_FIFONOTEMPTY = 0x40
MASK_FIFOLEVEL = 0x20
MASK_FIFOOVERRUN = 0x10
MASK_PACKETSENT = 0x08
MASK_TXREADY = 0x20
MASK_PACKETMODE = 0x60
MASK_MODULATION = 0x18
MASK_PAYLOADRDY = 0x04
MODE_STANDBY = 0x04 # Standby
MODE_TRANSMITER = 0x0C # Transmiter
MODE_RECEIVER = 0x10 # Receiver
VAL_REGDATAMODUL_FSK = 0x00 # Modulation scheme FSK
VAL_REGDATAMODUL_OOK = 0x08 # Modulation scheme OOK
VAL_FDEVMSB30 = 0x01 # frequency deviation 5kHz 0x0052 -> 30kHz 0x01EC
VAL_FDEVLSB30 = 0xEC # frequency deviation 5kHz 0x0052 -> 30kHz 0x01EC
VAL_FRMSB434 = 0x6C # carrier freq -> 434.3MHz 0x6C9333
VAL_FRMID434 = 0x93 # carrier freq -> 434.3MHz 0x6C9333
VAL_FRLSB434 = 0x33 # carrier freq -> 434.3MHz 0x6C9333
VAL_FRMSB433 = 0x6C # carrier freq -> 433.92MHz 0x6C7AE1
VAL_FRMID433 = 0x7A # carrier freq -> 433.92MHz 0x6C7AE1
VAL_FRLSB433 = 0xE1 # carrier freq -> 433.92MHz 0x6C7AE1
VAL_AFCCTRLS = 0x00 # standard AFC routine
VAL_AFCCTRLI = 0x20 # improved AFC routine
VAL_LNA50 = 0x08 # LNA input impedance 50 ohms
VAL_LNA50G = 0x0E # LNA input impedance 50 ohms, LNA gain -> 48db
VAL_LNA200 = 0x88 # LNA input impedance 200 ohms
VAL_RXBW60 = 0x43 # channel filter bandwidth 10kHz -> 60kHz page:26
VAL_RXBW120 = 0x41 # channel filter bandwidth 120kHz
VAL_AFCFEIRX = 0x04 # AFC is performed each time RX mode is entered
VAL_RSSITHRESH220 = 0xDC # RSSI threshold 0xE4 -> 0xDC (220)
VAL_PREAMBLELSB3 = 0x03 # preamble size LSB 3
VAL_PREAMBLELSB5 = 0x05 # preamble size LSB 5
VAL_SYNCCONFIG2 = 0x88 # Size of the Synch word = 2 (SyncSize + 1)
VAL_SYNCCONFIG4 = 0x98 # Size of the Synch word = 4 (SyncSize + 1)
VAL_SYNCVALUE1FSK = 0x2D # 1st byte of Sync word
VAL_SYNCVALUE2FSK = 0xD4 # 2nd byte of Sync word
VAL_SYNCVALUE1OOK = 0x80 # 1nd byte of Sync word
VAL_PACKETCONFIG1FSK = 0xA2 # Variable length, Manchester coding, Addr must match NodeAddress
VAL_PACKETCONFIG1FSKNO = 0xA0 # Variable length, Manchester coding
VAL_PACKETCONFIG1OOK = 0 # Fixed length, no Manchester coding
VAL_PAYLOADLEN255 = 0xFF # max Length in RX, not used in Tx
VAL_PAYLOADLEN66 = 66 # max Length in RX, not used in Tx
VAL_PAYLOADLEN_OOK = (13 + 8 * 17) # Payload Length
VAL_NODEADDRESS01 = 0x01 # Node address used in address filtering
VAL_NODEADDRESS04 = 0x04 # Node address used in address filtering
VAL_FIFOTHRESH1 = 0x81 # Condition to start packet transmission: at least one byte in FIFO
VAL_FIFOTHRESH30 = 0x1E # Condition to start packet transmission: wait for 30 bytes in FIFO
config_FSK = [
[ADDR_REGDATAMODUL, VAL_REGDATAMODUL_FSK], # modulation scheme FSK
[ADDR_FDEVMSB, VAL_FDEVMSB30], # frequency deviation 5kHz 0x0052 -> 30kHz 0x01EC
[ADDR_FDEVLSB, VAL_FDEVLSB30], # frequency deviation 5kHz 0x0052 -> 30kHz 0x01EC
[ADDR_FRMSB, VAL_FRMSB434], # carrier freq -> 434.3MHz 0x6C9333
[ADDR_FRMID, VAL_FRMID434], # carrier freq -> 434.3MHz 0x6C9333
[ADDR_FRLSB, VAL_FRLSB434], # carrier freq -> 434.3MHz 0x6C9333
[ADDR_AFCCTRL, VAL_AFCCTRLS], # standard AFC routine
[ADDR_LNA, VAL_LNA50], # 200ohms, gain by AGC loop -> 50ohms
[ADDR_RXBW, VAL_RXBW60], # channel filter bandwidth 10kHz -> 60kHz page:26
[ADDR_BITRATEMSB, 0x1A], # 4800b/s
[ADDR_BITRATELSB, 0x0B], # 4800b/s
#[ADDR_AFCFEI, VAL_AFCFEIRX], # AFC is performed each time rx mode is entered
#[ADDR_RSSITHRESH, VAL_RSSITHRESH220], # RSSI threshold 0xE4 -> 0xDC (220)
#[ADDR_PREAMBLELSB, VAL_PREAMBLELSB5], # preamble size LSB set to 5
[ADDR_SYNCCONFIG, VAL_SYNCCONFIG2], # Size of the Synch word = 2 (SyncSize + 1)
[ADDR_SYNCVALUE1, VAL_SYNCVALUE1FSK], # 1st byte of Sync word
[ADDR_SYNCVALUE2, VAL_SYNCVALUE2FSK], # 2nd byte of Sync word
#[ADDR_PACKETCONFIG1, VAL_PACKETCONFIG1FSK], # Variable length, Manchester coding, Addr must match NodeAddress
[ADDR_PACKETCONFIG1, VAL_PACKETCONFIG1FSKNO], # Variable length, Manchester coding
[ADDR_PAYLOADLEN, VAL_PAYLOADLEN66], # max Length in RX, not used in Tx
#[ADDR_NODEADDRESS, VAL_NODEADDRESS01], # Node address used in address filtering
[ADDR_NODEADDRESS, 0x06], # Node address used in address filtering
[ADDR_FIFOTHRESH, VAL_FIFOTHRESH1], # Condition to start packet transmission: at least one byte in FIFO
[ADDR_OPMODE, MODE_RECEIVER] # Operating mode to Receiver
]
config_OOK = [
[ADDR_REGDATAMODUL, VAL_REGDATAMODUL_OOK], # modulation scheme OOK
[ADDR_FDEVMSB, 0], # frequency deviation -> 0kHz
[ADDR_FDEVLSB, 0], # frequency deviation -> 0kHz
[ADDR_FRMSB, VAL_FRMSB433], # carrier freq -> 433.92MHz 0x6C7AE1
[ADDR_FRMID, VAL_FRMID433], # carrier freq -> 433.92MHz 0x6C7AE1
[ADDR_FRLSB, VAL_FRLSB433], # carrier freq -> 433.92MHz 0x6C7AE1
[ADDR_RXBW, VAL_RXBW120], # channel filter bandwidth 120kHz
[ADDR_BITRATEMSB, 0x40], # 1938b/s
[ADDR_BITRATELSB, 0x80], # 1938b/s
#[ADDR_BITRATEMSB, 0x1A], # 4800b/s
#[ADDR_BITRATELSB, 0x0B], # 4800b/s
[ADDR_PREAMBLELSB, 0], # preamble size LSB 3
[ADDR_SYNCCONFIG, VAL_SYNCCONFIG4], # Size of the Synch word = 4 (SyncSize + 1)
[ADDR_SYNCVALUE1, VAL_SYNCVALUE1OOK], # sync value 1
[ADDR_SYNCVALUE2, 0], # sync value 2
[ADDR_SYNCVALUE3, 0], # sync value 3
[ADDR_SYNCVALUE4, 0], # sync value 4
[ADDR_PACKETCONFIG1, VAL_PACKETCONFIG1OOK], # Fixed length, no Manchester coding, OOK
[ADDR_PAYLOADLEN, VAL_PAYLOADLEN_OOK], # Payload Length
[ADDR_FIFOTHRESH, VAL_FIFOTHRESH30], # Condition to start packet transmission: wait for 30 bytes in FIFO
#[ADDR_OPMODE, MODE_TRANSMITER] # Transmitter mode
]
def HRF_wait_ready():
"""Wait for HRF to be ready after last command"""
HRF_pollreg(ADDR_IRQFLAGS1, MASK_MODEREADY, MASK_MODEREADY)
def HRF_wait_txready():
"""Wait for HRF to be ready and ready for tx, after last command"""
trace("waiting for transmit ready...")
HRF_pollreg(ADDR_IRQFLAGS1, MASK_MODEREADY|MASK_TXREADY, MASK_MODEREADY|MASK_TXREADY)
trace("transmit ready")
def HRF_config_FSK():
"""Configure HRF for FSK modulation"""
for cmd in config_FSK:
HRF_writereg(cmd[0], cmd[1])
HRF_wait_ready()
def HRF_config_OOK():
"""Configure HRF for OOK modulation"""
for cmd in config_OOK:
HRF_writereg(cmd[0], cmd[1])
HRF_wait_ready()
def HRF_change_mode(mode):
HRF_writereg(ADDR_OPMODE, mode)
def HRF_clear_fifo():
"""Clear any data in the HRF payload FIFO by reading until empty"""
while (HRF_readreg(ADDR_IRQFLAGS2) & MASK_FIFONOTEMPTY) == MASK_FIFONOTEMPTY:
HRF_readreg(ADDR_FIFO)
def HRF_check_payload():
"""Check if there is a payload in the FIFO waiting to be processed"""
irqflags1 = HRF_readreg(ADDR_IRQFLAGS1)
irqflags2 = HRF_readreg(ADDR_IRQFLAGS2)
#trace("irq1 %s irq2 %s" % (hex(irqflags1), hex(irqflags2)))
return (irqflags2 & MASK_PAYLOADRDY) == MASK_PAYLOADRDY
def HRF_receive_payload():
"""Receive the whole payload"""
return HRF_readfifo_burst()
def HRF_send_payload(payload):
trace("send_payload")
#dumpPayloadAsHex(payload)
HRF_writefifo_burst(payload)
trace(" waiting for sent...")
HRF_pollreg(ADDR_IRQFLAGS2, MASK_PACKETSENT, MASK_PACKETSENT)
trace(" sent")
reg = HRF_readreg(ADDR_IRQFLAGS2)
trace(" irqflags2=%s" % hex(reg))
if ((reg & MASK_FIFONOTEMPTY) != 0) or ((reg & MASK_FIFOOVERRUN) != 0):
warning("Failed to send payload to HRF")
def dumpPayloadAsHex(payload):
length = payload[0]
print(hex(length))
if length+1 != len(payload):
print("warning length byte mismatch actual:%d inbuf:%d" % (len(payload), length))
for i in range(1,length+1):
print("[%d] = %s" % (i, hex(payload[i])))
def HRF_send_OOK_payload_repeat(payload, times=0):
"""Send a payload multiple times"""
HRF_pollreg(ADDR_IRQFLAGS1, MASK_MODEREADY|MASK_TXREADY, MASK_MODEREADY|MASK_TXREADY)
# A payload is 32 bits enclosed in sync words
# write first payload without sync preamble
HRF_writefifo_burst(payload)
# preceed all future payloads with a sync-word preamble
if times > 0:
SYNC_PREAMBLE = [0x00,0x80,0x00,0x00,0x00]
preamble_payload = SYNC_PREAMBLE + payload
for i in range(times): # Repeat the message a number of times
HRF_pollreg(ADDR_IRQFLAGS2, MASK_FIFOLEVEL, 0)
HRF_writefifo_burst(preamble_payload)
#TODO: this will be unreliable, as the IRQ might fire on any single packet
#need to check how big the FIFO is, and just build a single payload and burst load it
HRF_pollreg(ADDR_IRQFLAGS2, MASK_PACKETSENT, MASK_PACKETSENT) # wait for Packet sent
reg = HRF_readreg(ADDR_IRQFLAGS2)
trace(" irqflags2=%s" % hex(reg))
if (reg & (MASK_FIFONOTEMPTY) != 0) or ((reg & MASK_FIFOOVERRUN) != 0):
warning("Failed to send repeated OOK payload to HRF")
#----- USER API ---------------------------------------------------------------
#
# This is only a first-pass at a user API.
# it might change quite a bit in the second pass.
# The HRF functions are intentionally not used by the caller,
# this allows mock testing, and also for that part to be rewritten in C
# for speed later if required.
mode = None
modulation_fsk = None
def init():
"""Initialise the module ready for use"""
spi.init_defaults()
trace("RESET")
spi.reset() # send a hardware reset to ensure radio in clean state
trace("config FSK")
HRF_config_FSK()
HRF_clear_fifo()
receiver()
def modulation(fsk=None, ook=None):
"""Switch modulation, if needed"""
global modulation_fsk
# Handle sensible module defaults for earlier versions of user code
if fsk == None and ook == None:
# Force FSK mode
fsk = True
if fsk != None and fsk:
if modulation_fsk == None or modulation_fsk == False:
trace("switch to FSK")
HRF_config_FSK()
modulation_fsk = True
elif ook != None and ook:
if modulation_fsk == None or modulation_fsk == True:
trace("switch to OOK")
HRF_config_OOK()
modulation_fsk = False
def transmitter(fsk=None, ook=None):
"""Change into transmitter mode"""
global mode
trace("transmitter mode")
modulation(fsk, ook)
HRF_change_mode(MODE_TRANSMITER)
mode = "TRANSMITTER"
HRF_wait_txready()
def transmit(payload):
"""Transmit a single payload using the present modulation scheme"""
if not modulation_fsk:
HRF_send_OOK_payload_repeat(payload, times=8)
else:
HRF_send_payload(payload)
def receiver(fsk=None, ook=None):
"""Change into receiver mode"""
global mode
trace("receiver mode")
modulation(fsk, ook)
HRF_change_mode(MODE_RECEIVER)
HRF_wait_ready()
mode = "RECEIVER"
def isReceiveWaiting():
"""Check to see if a payload is waiting in the receive buffer"""
return HRF_check_payload()
def receive():
"""Receive a single payload from the buffer using the present modulation scheme"""
return HRF_receive_payload()
def finished():
"""Close the library down cleanly when finished"""
spi.finished()
# END
David Whale