add more plumbing for SPI on BeagleBone

reuse the Raspberry Pi SPI class as both are
Linux boards using spidev.  The main difference
is the pins numbers are different.

Testing with Adafruit_CircuitPython_BME280 in SPI mode.

TODO: wire up the board to the BeagleBone Black

Current output:

debian@beaglebone:~/Adafruit_CircuitPython_BME280$ sudo python3 examples/bme280_simpletest.py
SPI(): __init()
SPI(): beaglebone_black: from adafruit_blinka.microcontroller.raspi_23.spi import SPI as _SPI
spiPorts: ((0, P9_22, P9_18, P9_21), (1, P9_22, P9_18, P9_21))
for:
0 P9_22 P9_18 P9_21
Line 91
<class 'adafruit_blinka.microcontroller.raspi_23.spi.SPI'>
<adafruit_blinka.microcontroller.raspi_23.spi.SPI object at 0xb6b3c890>
Traceback (most recent call last):
  File "examples/bme280_simpletest.py", line 15, in <module>
    bme280 = adafruit_bme280.Adafruit_BME280_SPI(spi, bme_cs)
  File "/usr/local/lib/python3.5/dist-packages/adafruit_circuitpython_bme280-2.1.1.dev3+g1416d93-py3.5.egg/adafruit_bme280.py", line 247, in __init__
  File "/usr/local/lib/python3.5/dist-packages/adafruit_circuitpython_bme280-2.1.1.dev3+g1416d93-py3.5.egg/adafruit_bme280.py", line 78, in __init__
RuntimeError: Failed to find BME280! Chip ID 0x0

diff --git a/src/adafruit_blinka/board/beaglebone_black.py b/src/adafruit_blinka/board/beaglebone_black.py
index d3fc75b88ff3dc34ba527cc30852cc883c3b45be..489e332e63521c8f67c665fc3ba878b5686428ee 100644 (file)
--- a/src/adafruit_blinka/board/beaglebone_black.py
+++ b/src/adafruit_blinka/board/beaglebone_black.py
@@ -104,3 +104,5 @@ CE0 = pin.CE0
 MOSI = pin.MOSI
 MISO = pin.MISO
 SCLK = pin.SCLK
+#CircuitPython naming convention for SPI Clock
+SCK = pin.SCK

diff --git a/src/adafruit_blinka/microcontroller/beaglebone_black/pin.py b/src/adafruit_blinka/microcontroller/beaglebone_black/pin.py
index 0084da7f87c62a36fbca147803a599f89c809c65..a379f1dfc438d58c2377dcaeded26b3422b77dc2 100644 (file)
--- a/src/adafruit_blinka/microcontroller/beaglebone_black/pin.py
+++ b/src/adafruit_blinka/microcontroller/beaglebone_black/pin.py
@@ -151,13 +151,12 @@ CE0 = Pin('P9_17')
 MOSI = Pin('P9_18')
 MISO = Pin('P9_21')
 SCLK = Pin('P9_22')
+#CircuitPython naming convention for SPI Clock
+SCK = Pin('P9_22')
 
-# example from RPi:
-# spiPorts = ((0, SCLK, MOSI, MISO), (1, SCLK_1, MOSI_1, MISO_1))
 # ordered as spiId, sckId, mosiId, misoId
-spiPorts = (
-   (0, SCLK, MOSI, MISO)
-)
+#spiPorts = ((0, SCLK, MOSI, MISO), (1, SCLK_1, MOSI_1, MISO_1))
+spiPorts = ((0, SCLK, MOSI, MISO), (1, SCLK, MOSI, MISO))
 
 # ordered as uartId, txId, rxId
 uartPorts = (

diff --git a/src/busio.py b/src/busio.py
index 206635d46df557560aab437b123bb217bdd3987e..fb3ab1079a19fe3f461b6566ff8844644a61dc97 100755 (executable)
--- a/src/busio.py
+++ b/src/busio.py
@@ -71,18 +71,26 @@ class I2C(Lockable):
 
 class SPI(Lockable):
     def __init__(self, clock, MOSI=None, MISO=None):
+        print("SPI(): __init()")
         self.deinit()
         if board_id == "raspi_3" or board_id == "raspi_2":
             from adafruit_blinka.microcontroller.raspi_23.spi import SPI as _SPI
         elif board_id == "beaglebone_black":
-            from adafruit_blinka.microcontroller.beaglebone_black.spi import SPI as _SPI
+            print("SPI(): beaglebone_black: from adafruit_blinka.microcontroller.raspi_23.spi import SPI as _SPI")
+            from adafruit_blinka.microcontroller.raspi_23.spi import SPI as _SPI
         else:
             from machine import SPI as _SPI
         from microcontroller.pin import spiPorts
+        print("spiPorts: {0}".format(spiPorts))
+        print("for:")
         for portId, portSck, portMosi, portMiso in spiPorts:
+            print(portId, portSck, portMosi, portMiso)
             if ((clock == portSck) and                   # Clock is required!
                 (MOSI == portMosi or MOSI == None) and   # But can do with just output
                 (MISO == portMiso or MISO == None)):      # Or just input
+                print("Line 91")
+                print(_SPI)
+                print(_SPI(portId))
                 self._spi = _SPI(portId)
                 self._pins = (portSck, portMosi, portMiso)
                 break
@@ -96,7 +104,8 @@ class SPI(Lockable):
             from adafruit_blinka.microcontroller.raspi_23.spi import SPI as _SPI
             from adafruit_blinka.microcontroller.raspi_23.pin import Pin
         elif board_id == "beaglebone_black":
-            from adafruit_blinka.microcontroller.beaglebone_black.spi import SPI as _SPI
+            # reuse the raspberry pi class as both boards use Linux spidev
+            from adafruit_blinka.microcontroller.raspi_23.spi import SPI as _SPI
             from adafruit_blinka.microcontroller.beaglebone_black.pin import Pin
         else:
             from machine import SPI as _SPI