30 lines
765 B
Python
30 lines
765 B
Python
import io
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import fcntl
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import struct
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I2C_SLAVE = 0x0703
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class I2CRaw:
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def __init__(self, address, bus):
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self.fr = io.open(f"/dev/i2c-{bus}", "rb", buffering=0)
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self.fw = io.open(f"/dev/i2c-{bus}", "wb", buffering=0)
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fcntl.ioctl(self.fr, I2C_SLAVE, address)
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fcntl.ioctl(self.fw, I2C_SLAVE, address)
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def write_i2c_block_data(self, data):
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if type(data) is not list:
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return -1
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data = bytearray(data)
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self.fw.write(data)
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return 0
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def read_i2c_block_data(self, n_bytes):
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data_raw = self.fr.read(n_bytes)
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unpack_format = 'B'*n_bytes
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return list(struct.unpack(unpack_format, data_raw))
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def close(self):
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self.fr.close()
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self.fw.close()
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