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Raise warning when spidev missing for hardware SPI

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This commit is contained in:
Dave Jones
2016-06-12 13:31:13 +01:00
parent 15b6ea25b0
commit 3ac838f85f
1 changed files with 17 additions and 11 deletions
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28
gpiozero/spi.py
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@@ -396,24 +396,30 @@ def SPI(**spi_args):
raise SPIBadArgs(
'unrecognized keyword argument %s' % kwargs.popitem()[0])
if all((
SpiDev is not None,
spi_args['clock_pin'] == 11,
spi_args['mosi_pin'] == 10,
spi_args['miso_pin'] == 9,
spi_args['select_pin'] in (7, 8),
)):
try:
if shared:
return SharedSPIHardwareInterface(
port=0, device={8: 0, 7: 1}[spi_args['select_pin']])
else:
return SPIHardwareInterface(
port=0, device={8: 0, 7: 1}[spi_args['select_pin']])
except Exception as e:
if SpiDev is None:
warnings.warn(
SPISoftwareFallback(
'failed to initialize hardware SPI, falling back to '
'software (error was: %s)' % str(e)))
'failed to import spidev, falling back to software SPI'))
else:
try:
hardware_spi_args = {
port: 0,
device: {8: 0, 7: 1}[spi_args['select_pin']],
}
if shared:
return SharedSPIHardwareInterface(**hardware_spi_args)
else:
return SPIHardwareInterface(**hardware_spi_args)
except Exception as e:
warnings.warn(
SPISoftwareFallback(
'failed to initialize hardware SPI, falling back to '
'software (error was: %s)' % str(e)))
if shared:
return SharedSPISoftwareInterface(**spi_args)
else: