simple_kalman: rename variable in test for something more meaningful

[pyshared.git] / bus_pirate.py

diff --git a/bus_pirate.py b/bus_pirate.py
index aa7d51bf2494e541fdb0b4309e8638898475fa58..cdd259fa7581ee42dba23da879fbf10b3aa4d287 100644 (file)
--- a/bus_pirate.py
+++ b/bus_pirate.py
@@ -64,6 +64,29 @@ class BP:
                v = struct.unpack(">h", s)
                return v[0]/1024.0*6.6
 
+       # http://codepad.org/qtYpZmIF
+       def pwm(self, freq, duty_cycle_percent):
+               lPrescaler = {0:1, 1:8 , 2:64, 3:256}
+               Fosc = 32e6
+               Tcy = 2.0 / Fosc
+               period = 1.0 / freq
+               prescaler = 1
+
+               # find needed prescaler
+               for i in range(4):
+                       prescaler = lPrescaler[i]
+                       PRy = period * 1.0 / (Tcy * prescaler)
+                       PRy = int(PRy - 1)
+                       OCR = int(PRy * duty_cycle_percent)
+
+                       if PRy < (2 ** 16 - 1):
+                               break # valid value for PRy, keep values
+
+               cmd = struct.pack(">BBHH", 0b00010010, i, OCR, PRy)
+               ret = self.command(cmd, 1)
+               if ord(ret) != 0x1:
+                       raise Exception()
+
        def spi_command(self, cmd):
                ret = self.command(cmd, 1)
                if ord(ret) != 0x1:
@@ -106,3 +129,57 @@ class BP:
                        raise Exception("Bad I/O pin")
                state = self.update_io()
                return state & (1 << dPinToBit[pin])
+
+       def mode_i2c(self, bEnablePower=False, bEnablePullup=False, iSpeedkHz=100):
+               if self.command(chr(0x2), 4) != "I2C1":
+                       raise Exception()
+
+               dSpeeds = {
+                       5: 0x0,
+                       50: 0x1,
+                       100: 0x2,
+                       400: 0x3,
+               }
+               if iSpeedkHz not in dSpeeds.keys():
+                       raise Exception("Invalid I2C speed")
+               ret = self.command(chr(0b01100000 | dSpeeds[iSpeedkHz]), 1)
+               if ord(ret) != 0x1:
+                       raise Exception()
+
+               periphals = 0b01000000
+               if bEnablePower:
+                       periphals |= (1<<3)
+               if bEnablePullup:
+                       periphals |= (1<<2)
+               ret = self.command(chr(periphals), 1)
+               if ord(ret) != 0x1:
+                       raise Exception()
+
+       def i2c_write(self, addr, reg, s):
+               # 1. Write
+               # command (1) | number of write bytes (2) | number of read bytes (2) | bytes to write (0..)
+               msg = struct.pack(">BHHBB%ds" % len(s), 0x08, 2+len(s), 0, addr, reg, s)
+               ret = self.command(msg, 1)
+
+               if ord(ret[0]) != 0x1:
+                       raise Exception("I2C write error")
+
+       def i2c_read(self, addr, reg, num_read):
+               # set reg
+               self.i2c_write(addr, reg, "")
+
+               # command (1) | number of write bytes (2) | number of read bytes (2) | bytes to write (0..)
+               msg = struct.pack(">BHHB", 0x08, 1, num_read, addr | 0x1)
+               ret = self.command(msg, 1 + num_read)
+
+               if ord(ret[0]) != 0x1:
+                       raise Exception("I2C read error")
+
+               return ret[1:]
+
+       def i2c_search(self):
+               for i in range(128):
+                       msg = struct.pack(">BHHB", 0x08, 1, 1, i)
+                       ret = self.command(msg, 1)
+                       if ord(ret) == 0x1:
+                               print "Found I2C Addr: 0x%x" % (i & ~0x1)