nxp_lpc4430: Fix SPI.readinto's write_value= argument

Before, this argument was ignored.  This prevented adafruit_sdcard from
functioning, as it relies on being able to send out the value 0xff.

This fix is speculative and untested.

diff --git a/src/adafruit_blinka/microcontroller/nxp_lpc4330/spi.py b/src/adafruit_blinka/microcontroller/nxp_lpc4330/spi.py
index 17859a42d374e19b23f93de123c7ea97172072d7..a6e40459dc2ff7ac3965c396355163ae2699e9cc 100644 (file)
--- a/src/adafruit_blinka/microcontroller/nxp_lpc4330/spi.py
+++ b/src/adafruit_blinka/microcontroller/nxp_lpc4330/spi.py
@@ -93,7 +93,7 @@ class SPI:
     def readinto(self, buf, start=0, end=None, write_value=0):
         """Read data from SPI and into the buffer"""
         end = end if end else len(buf)
-        result = self._transmit([], end - start)
+        result = self._transmit([write_value] * (end-start), end - start)
         for i, b in enumerate(result):
             buf[start + i] = b