Commit 70695597 authored by adminpete's avatar adminpete Committed by Damien George
Browse files

drivers, nrf24: Nonblocking send now done by generator.

parent 5deceb84
"""NRF24L01 driver for Micro Python
Support for nonblocking send added. Minor fixes:
Timeout now uses pyb.elapsed_millis().
Channel numbers constrained to 125 as per datasheet.
Status register read with reg_read() - reg_read_ret_status() removed.
Default speed 250K for improved range/error rate.
"""
import pyb
......@@ -145,7 +139,7 @@ class NRF24L01:
self.reg_write(CONFIG, config)
def set_channel(self, channel):
self.reg_write(RF_CH, min(channel, 125)) # Changed from 127
self.reg_write(RF_CH, min(channel, 125))
# address should be a bytes object 5 bytes long
def open_tx_pipe(self, address):
......@@ -207,44 +201,38 @@ class NRF24L01:
start = pyb.millis()
result = None
while result is None and (pyb.elapsed_millis(start) < timeout):
result = send_nonblock() # 1 == success 2 == fail
result = next(send_nonblock) # 1 == success 2 == fail
if result == 2:
raise OSError("send failed")
def send_nonblocking(self, buf):
'''
Support for nonblocking transmission. Returns a function instance.
The first call to a function instance sends the data and returns None.
Subsequent calls test TX status returning not ready None, ready 1, error 2.
Support for nonblocking transmission. Returns a generator instance.
First use sends the data and returns None. Subsequently tests TX status
returning not ready None, ready 1, error 2.
'''
init = True
def make_snb():
nonlocal init
if init:
# power up
self.reg_write(CONFIG, (self.reg_read(CONFIG) | PWR_UP) & ~PRIM_RX)
pyb.udelay(150)
# send the data
self.cs.low()
self.spi.send(W_TX_PAYLOAD)
self.spi.send(buf)
if len(buf) < self.payload_size:
self.spi.send(b'\x00' * (self.payload_size - len(buf))) # pad out data
self.cs.high()
# enable the chip so it can send the data
self.ce.high()
pyb.udelay(15) # needs to be >10us
self.ce.low()
init = False
return None # Not ready
if not (self.reg_read(STATUS) & (TX_DS | MAX_RT)):
return None # Not ready
# Either ready or failed: get and clear status flags, power down
status = self.reg_write(STATUS, RX_DR | TX_DS | MAX_RT)
self.reg_write(CONFIG, self.reg_read(CONFIG) & ~PWR_UP)
return 1 if status & TX_DS else 2
return make_snb
# power up
self.reg_write(CONFIG, (self.reg_read(CONFIG) | PWR_UP) & ~PRIM_RX)
pyb.udelay(150)
# send the data
self.cs.low()
self.spi.send(W_TX_PAYLOAD)
self.spi.send(buf)
if len(buf) < self.payload_size:
self.spi.send(b'\x00' * (self.payload_size - len(buf))) # pad out data
self.cs.high()
# enable the chip so it can send the data
self.ce.high()
pyb.udelay(15) # needs to be >10us
self.ce.low()
yield None # Not ready
while not (self.reg_read(STATUS) & (TX_DS | MAX_RT)):
yield None # Not ready
# Either ready or failed: get and clear status flags, power down
status = self.reg_write(STATUS, RX_DR | TX_DS | MAX_RT)
self.reg_write(CONFIG, self.reg_read(CONFIG) & ~PWR_UP)
yield 1 if status & TX_DS else 2
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