m

Author: peter-pycom

spi_master.py

@@ -0,0 +1,77 @@
+from machine import SPI
+from machine import Pin
+import os
+import sys
+import time
+
+def log(fct):
+    last = None
+    while True:
+        v = fct()
+        if v != last:
+            print(time.time(), v)
+            last = v
+        time.sleep(1)
+
+p_mosi = 'P11'
+p_miso = 'P14'
+# p_miso = 'P16' # ... doesn't work ... why? on a gpy
+p_clk  = 'P10'
+# p_cs   =  'P3'
+
+# KSZ8851
+p_mosi = 'P23'
+p_miso = 'P17'
+p_clk  = 'P21'
+
+# esp32 HSPI
+p_mosi = 'P10' # gpio013
+p_miso =  'P9' # gpio012
+p_clk  = 'P23' # gpio014
+
+
+
+# cs   = Pin(p_cs,  mode=Pin.OUT, value=1)
+# clk  = Pin(p_clk, mode=Pin.OUT, value=0)
+# mosi = Pin(p_mosi, mode=Pin.OUT)
+# miso = Pin(p_miso, mode=Pin.IN, pull=Pin.PULL_UP)
+
+#            CLK,   MOSI   MISO
+# spi_pins = ('P22', "P11", "P16")
+spi_pins = (p_clk, p_mosi, p_miso)
+
+speeds = [ 10_000, 100_000, 1_000_000, 10_000_000, 11_000_000, 12_000_000, 13_000_000, 15_000_000, 20_000_000, 40_000_000 ]
+speeds = [ 10_000_000, 11_000_000, 11_250_000, 11_375_000, 11_500_000, 12_000_000, 13_000_000]
+ok   = [0] * len(speeds)
+fail = [0] * len(speeds)
+# br = 20_000_000 #  20 M
+# br = 10_000_000 #  10 M
+# br =  2_000_000 #   2 M
+# br =  1_000_000 #   1 M
+br =    200_000 # 200 K
+# br =    100_000 # 100 K
+# br =     10_000 #  10 K
+buffer_w = bytearray([0x1, 0x2, 0x3, 0x1,0x2,0x3, 0x1,0x2,0x3, 0x66])
+# buffer_w = bytearray([0xa,0xa,0xa, 0xa,0xa,0xa, 0xa,0xa,0xa, 0])
+#buffer_w = bytearray([0xa,0xe,0xa, 0xe,0xa,0xe, 0xa,0xe,0xa, 0])
+buffer_r = bytearray(len(buffer_w))
+while True:
+    for s in range(len(speeds)):
+        spi = SPI(0, SPI.MASTER, baudrate=speeds[s], polarity=0, phase=0, pins=spi_pins)
+        for i in range(10):
+            # cs(0)
+            l = spi.write_readinto(buffer_w, buffer_r)
+            # cs(1)
+            # print(buffer_r)
+            # print(buffer_r == buffer_w)
+            if buffer_r == buffer_w:
+                ok[s] += 1
+            else:
+                fail[s] += 1
+            time.sleep(0.01)
+    for s in range(len(speeds)):
+        print("{}:{}/{}".format(speeds[s],ok[s],fail[s]), end=' ')
+    print()
+
+sys.exit()
+log(miso)