Merge pull request #248 from caternuson/mcp2221_hid_tweak

[hackapet/Adafruit_Blinka.git] / src / adafruit_blinka / microcontroller / mcp2221 / mcp2221.py

diff --git a/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py b/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py
index aae81e5088df6d583bf6f142b20cedc10f4d5c11..0cddf42eeac253dc72bc277099e7986734f949da 100644 (file)
--- a/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py
+++ b/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py
@@ -1,6 +1,12 @@
+import os

 import time
 import hid
 
 import time
 import hid
 

+# Here if you need it
+MCP2221_HID_DELAY = float(os.environ.get('BLINKA_MCP2221_HID_DELAY', 0))
+# Use to set delay between reset and device reopen
+MCP2221_RESET_DELAY = float(os.environ.get('BLINKA_MCP2221_RESET_DELAY', 0.5))
+

 # from the C driver
 # http://ww1.microchip.com/downloads/en/DeviceDoc/mcp2221_0_1.tar.gz
 # others (???) determined during driver developement
 # from the C driver
 # http://ww1.microchip.com/downloads/en/DeviceDoc/mcp2221_0_1.tar.gz
 # others (???) determined during driver developement


@@ -44,13 +50,13 @@ class MCP2221:
         self._hid = hid.device()
         self._hid.open(MCP2221.VID, MCP2221.PID)
         self._reset()
         self._hid = hid.device()
         self._hid.open(MCP2221.VID, MCP2221.PID)
         self._reset()

-        time.sleep(0.25)

 
     def _hid_xfer(self, report, response=True):
         # first byte is report ID, which =0 for MCP2221
         # remaing bytes = 64 byte report data
         # https://github.com/libusb/hidapi/blob/083223e77952e1ef57e6b77796536a3359c1b2a3/hidapi/hidapi.h#L185
         self._hid.write(b'\0' + report + b'\0'*(64-len(report)))
 
     def _hid_xfer(self, report, response=True):
         # first byte is report ID, which =0 for MCP2221
         # remaing bytes = 64 byte report data
         # https://github.com/libusb/hidapi/blob/083223e77952e1ef57e6b77796536a3359c1b2a3/hidapi/hidapi.h#L185
         self._hid.write(b'\0' + report + b'\0'*(64-len(report)))

+        time.sleep(MCP2221_HID_DELAY)

         if response:
             # return is 64 byte response report
             return self._hid.read(64)
         if response:
             # return is 64 byte response report
             return self._hid.read(64)


@@ -100,6 +106,7 @@ class MCP2221:
 
     def _reset(self):
         self._hid_xfer(b'\x70\xAB\xCD\xEF', response=False)
 
     def _reset(self):
         self._hid_xfer(b'\x70\xAB\xCD\xEF', response=False)

+        time.sleep(MCP2221_RESET_DELAY)

         start = time.monotonic()
         while time.monotonic() - start < 5:
             try:
         start = time.monotonic()
         while time.monotonic() - start < 5:
             try: