+# SPDX-FileCopyrightText: 2021 Melissa LeBlanc-Williams for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
"""I2C Class for Binho Nova"""
from adafruit_blinka.microcontroller.nova import Connection
class I2C:
"""Custom I2C Class for Binho Nova"""
+ WHR_PAYLOAD_MAX_LENGTH = 1024
+
def __init__(self, *, frequency=400000):
self._nova = Connection.getInstance()
self._nova.setNumericalBase(10)
self._nova.setPullUpStateI2C(0, "EN")
self._nova.setClockI2C(0, frequency)
+ self._novaCMDVer = "0"
+ if hasattr(self._nova, "getCommandVer"):
+ response = self._nova.getCommandVer().split(" ")
+ if response[0] != "-NG":
+ self._novaCMDVer = response[1]
+
+ def __del__(self):
+ """Close Nova on delete"""
+ self._nova.close()
+
def scan(self):
"""Perform an I2C Device Scan"""
scanResults = []
def writeto(self, address, buffer, *, start=0, end=None, stop=True):
"""Write data from the buffer to an address"""
end = end if end else len(buffer)
+ readBytes = 0
+ if int(self._novaCMDVer) >= 1:
+ chunks, rest = divmod(end - start, self.WHR_PAYLOAD_MAX_LENGTH)
+ for i in range(chunks):
+ chunk_start = start + i * self.WHR_PAYLOAD_MAX_LENGTH
+ chunk_end = chunk_start + self.WHR_PAYLOAD_MAX_LENGTH
+ self._nova.writeToReadFromI2C(
+ 0,
+ address << 1,
+ stop,
+ readBytes,
+ chunk_end - chunk_start,
+ buffer[chunk_start:chunk_end],
+ )
+ if rest:
+ self._nova.writeToReadFromI2C(
+ 0, address << 1, stop, readBytes, rest, buffer[-1 * rest :]
+ )
+ else:
+ self._nova.startI2C(0, address << 1)
- self._nova.startI2C(0, address << 1)
+ for i in range(start, end):
+ self._nova.writeByteI2C(0, buffer[i])
- for i in range(start, end):
- self._nova.writeByteI2C(0, buffer[i])
-
- if stop:
- self._nova.endI2C(0)
- else:
- self._nova.endI2C(0, True)
+ if stop:
+ self._nova.endI2C(0)
+ else:
+ self._nova.endI2C(0, True)
+ # pylint: disable=unused-argument
def readfrom_into(self, address, buffer, *, start=0, end=None, stop=True):
"""Read data from an address and into the buffer"""
end = end if end else len(buffer)
-
result = self._nova.readBytesI2C(0, address << 1, len(buffer[start:end]))
if result != "-NG":
"Received error response from Binho Nova, result = " + result
)
- # pylint: disable=unused-argument
+ # pylint: disable=too-many-locals,too-many-branches
def writeto_then_readfrom(
self,
address,
out_end=None,
in_start=0,
in_end=None,
- stop=False
+ stop=False,
):
"""Write data from buffer_out to an address and then
read data from an address and into buffer_in
"""
out_end = out_end if out_end else len(buffer_out)
in_end = in_end if in_end else len(buffer_in)
+ if int(self._novaCMDVer) >= 1:
+ totalIn = in_end - in_start
+ totalOut = out_end - out_start
+ totalBytes = totalIn
+ if totalOut > totalIn:
+ totalBytes = totalOut
+ chunks, rest = divmod(totalBytes, self.WHR_PAYLOAD_MAX_LENGTH)
+ if rest > 0:
+ chunks += 1
+
+ for i in range(chunks):
+ # calculate the number of bytes to be written and read
+ numInBytes = self.WHR_PAYLOAD_MAX_LENGTH
+ if totalIn < self.WHR_PAYLOAD_MAX_LENGTH:
+ numInBytes = totalIn
+ numOutBytes = self.WHR_PAYLOAD_MAX_LENGTH
+ if totalOut < self.WHR_PAYLOAD_MAX_LENGTH:
+ numOutBytes = totalOut
+
+ # setup the buffer out chunk offset
+ buffer = "0"
+ if numOutBytes > 0:
+ chunk_start = out_start + i * self.WHR_PAYLOAD_MAX_LENGTH
+ chunk_end = chunk_start + numOutBytes
+ buffer = buffer_out[chunk_start:chunk_end]
+
+ result = self._nova.writeToReadFromI2C(
+ 0, address << 1, stop, numInBytes, numOutBytes, buffer
+ )
+ totalIn -= numInBytes
+ totalOut -= numOutBytes
+
+ if result != "-NG":
+ if numInBytes:
+ resp = result.split(" ")
+ resp = resp[2]
+
+ for j in range(numInBytes):
+ buffer_in[
+ in_start + i * self.WHR_PAYLOAD_MAX_LENGTH + j
+ ] = int(resp[j * 2] + resp[j * 2 + 1], 16)
+ else:
+ raise RuntimeError(
+ "Received error response from Binho Nova, result = " + result
+ )
+ else:
+ self._nova.startI2C(0, address << 1)
- self._nova.startI2C(0, address << 1)
-
- for i in range(out_start, out_end):
- self._nova.writeByteI2C(0, buffer_out[i])
+ for i in range(out_start, out_end):
+ self._nova.writeByteI2C(0, buffer_out[i])
- self._nova.endI2C(0, True)
+ if stop:
+ self._nova.endI2C(0)
+ else:
+ self._nova.endI2C(0, True)
- result = self._nova.readBytesI2C(
- 0, address << 1, len(buffer_in[in_start:in_end])
- )
+ result = self._nova.readBytesI2C(
+ 0, address << 1, len(buffer_in[in_start:in_end])
+ )
- if result != "-NG":
- resp = result.split(" ")
+ if result != "-NG":
+ resp = result.split(" ")
- for i in range(len(buffer_in[in_start:in_end])):
- buffer_in[in_start + i] = int(resp[2 + i])
- else:
- raise RuntimeError(
- "Received error response from Binho Nova, result = " + result
- )
+ for i in range(len(buffer_in[in_start:in_end])):
+ buffer_in[in_start + i] = int(resp[2 + i])
+ else:
+ raise RuntimeError(
+ "Received error response from Binho Nova, result = " + result
+ )
-# pylint: enable=unused-argument
+# pylint: enable=unused-argument,too-many-locals,too-many-branches
projects / Adafruit_Blinka-hackapet.git / blobdiff