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spi.py:fix spi model_0 for read. data shift at negedge, sample at posedge. #244

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spi.py:fix spi model_0 for read. data shift at negedge, sample at posedge. #244

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6 changes: 3 additions & 3 deletions pyftdi/spi.py
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Original file line number Diff line number Diff line change
Expand Up @@ -819,18 +819,18 @@ def _exchange_half_duplex(self, frequency: float,
cmd.extend(write_cmd)
if readlen:
if not droptail:
rcmd = (Ftdi.READ_BYTES_NVE_MSB if not cpol else
rcmd = (Ftdi.READ_BYTES_NVE_MSB if cpol else
Ftdi.READ_BYTES_PVE_MSB)
read_cmd = spack('<BH', rcmd, readlen-1)
cmd.extend(read_cmd)
else:
bytelen = readlen-1
if bytelen:
rcmd = (Ftdi.READ_BYTES_NVE_MSB if not cpol else
rcmd = (Ftdi.READ_BYTES_NVE_MSB if cpol else
Ftdi.READ_BYTES_PVE_MSB)
read_cmd = spack('<BH', rcmd, bytelen-1)
cmd.extend(read_cmd)
rcmd = (Ftdi.READ_BITS_NVE_MSB if not cpol else
rcmd = (Ftdi.READ_BITS_NVE_MSB if cpol else
Ftdi.READ_BITS_PVE_MSB)
read_cmd = spack('<BB', rcmd, 7-droptail)
cmd.extend(read_cmd)
Expand Down