Improve PI-SPI-DIN-4AO support

Author: optlink

python/pi_spi_din_4ao_prog.py

@@ -0,0 +1,99 @@
+#!/usr/bin/python3
+
+import RPi.GPIO as GPIO
+
+from subprocess import call
+from sys import exit
+from time import sleep
+
+DELAY = 0.005
+
+SCK = 3
+SDA = 2
+
+try:
+    old_address = int(input('Old address: '))
+    new_address = int(input('New address: '))
+    if old_address > 7 or old_address < 0 or new_address > 7 or new_address < 0:
+        raise
+except:
+    print('Invalid address')
+    print('Address must be between 0 and 7')
+    exit(1)
+
+#if old_address > 0x67 or old_address < 0x60 or new_address > 0x67 or new_address < 0x60:
+#    print('Invalid address')
+#    print('Address must be between 0x60 and 0x67')
+#    exit(1)
+
+GPIO.setmode(GPIO.BCM)  # Use RPi GPIO numbers
+GPIO.setwarnings(False) # disable warnings
+
+GPIO.setup(SCK, GPIO.OUT)
+GPIO.setup(SDA, GPIO.OUT)
+GPIO.output(SCK, 1)
+GPIO.output(SDA, 1)
+
+def i2c_ack_byte():
+    GPIO.setup(SDA, GPIO.IN)
+    GPIO.output(SCK, 1)
+    sleep(DELAY)
+    GPIO.output(SCK, 0)
+    GPIO.setup(SDA, GPIO.OUT)
+
+def i2c_write_byte(byte):
+    for i in range(8):
+        sleep(DELAY)
+        GPIO.output(SCK, 0)
+        
+        if byte & 0x80:
+            GPIO.output(SDA, 1)
+        else:
+            GPIO.output(SDA, 0)
+            
+        sleep(DELAY)
+        GPIO.output(SCK, 1)
+        
+        byte <<= 1
+        
+    sleep(DELAY)
+    GPIO.output(SCK, 0)
+    GPIO.output(SDA, 0)
+    
+    
+data = [
+    (old_address + 0x60) << 1,
+    0x61 | (old_address << 2),
+    0x62 | (new_address << 2),
+    0x63 | (new_address << 2)
+]
+	
+GPIO.output(SDA, 0)
+sleep(DELAY)
+
+i2c_write_byte(data[0])
+i2c_ack_byte()
+
+i2c_write_byte(data[1])
+input('Insert jumper J1 and press enter')
+i2c_ack_byte()
+
+i2c_write_byte(data[2])
+i2c_ack_byte()
+
+i2c_write_byte(data[3])
+i2c_ack_byte()
+
+GPIO.output(SDA, 0)
+
+sleep(DELAY)
+GPIO.output(SCK, 1)
+
+GPIO.output(SDA, 1)
+
+GPIO.cleanup()
+print('Attempting to reset I2C bus...')
+call(['modprobe', '-r', 'i2c_bcm2835'])
+call(['modprobe', 'i2c_bcm2835'])
+
+print('Done! Remove the jumper')

python/widgetlords/pi_spi_din.py

@@ -51,13 +51,13 @@ def read_single(self, channel: int):
 __all__.append('Mod8AI')
 
 class Mod4AO:
-    def __init__(self):
-        widgetlords.pi_spi_din_4ao_init()
+    def __init__(self, address: int = 0):
+        self.address = address
 
-    def write_single(self, channel: int, counts: int, address = 0):
-        widgetlords.pi_spi_din_4ao_write_single(address, channel, counts)
+    def write_single(self, channel: int, counts: int):
+        widgetlords.pi_spi_din_4ao_write_single(self.address, channel, counts)
 __all__.append('Mod4AO')
-        
+
 class Mod4Freq:
     def __init__(self, chip_enable: ChipEnable, address: int = 0):
         self.chip_enable = chip_enable.value