From b5c457265c44ac26be4f44b68b02944bb9869416 Mon Sep 17 00:00:00 2001 From: Carter Nelson Date: Tue, 4 Feb 2020 13:41:47 -0800 Subject: [PATCH] change MCP2221 reset behavior --- src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py b/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py index 8247006..3cfb46b 100644 --- a/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py +++ b/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py @@ -4,6 +4,8 @@ import hid # Small values seem to help on some Windows setups MCP2221_HID_DELAY = float(os.environ.get('BLINKA_MCP2221_HID_DELAY', 0)) +# Windows also seems to want some time after a reset +MCP2221_RESET_DELAY = float(os.environ.get('BLINKA_MCP2221_RESET_DELAY', 0.1)) # from the C driver # http://ww1.microchip.com/downloads/en/DeviceDoc/mcp2221_0_1.tar.gz @@ -48,7 +50,6 @@ class MCP2221: 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 @@ -105,6 +106,7 @@ class MCP2221: 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: -- 2.49.0