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set range for divider values

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Thao 2017-09-21 14:26:16 +08:00
parent 9ccd95e10d
commit e94d2d3779
1 changed files with 2 additions and 0 deletions
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2
artiq/coredevice/spi.py
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@ -155,6 +155,8 @@ class SPIMaster:
by one RTIO clock cycle.
:param read_div: Ditto for the read clock.
"""
if write_div > 257 or write_div < 2 or read_div > 257 or read_div < 2:
raise ValueError('Divider values out of range')
rtio_output(now_mu(), self.channel, SPI_CONFIG_ADDR, flags |
((write_div - 2) << 16) | ((read_div - 2) << 24))
self.write_period_mu = int(write_div*self.ref_period_mu)