Ross Ridge wrote:
>I don't think you can do anything faster with standard modules, although
>it might not be efficient if you're only working with a single byte.
Hendrik van Rooyen <[EMAIL PROTECTED]> wrote:
>Thanks I was not aware of binascii module this looks powerful.
Not really. It's just used as part of a trick to quickly convert a byte
string in to a bit string (a byte string with just 0s and 1s).
Unfortunately fromr you other posts you do seem to be working on
a single byte a time, so my technique probably won't be efficient.
You probably want just want to be using constants and bit masking.
Something like:
PAC_EMERGENCY_STOP = 0x01 # bit #0 on output port 0
PAC_OUTPUT_0_1 = 0x02 # replace with names for other functions
PAC_OUTPUT_0_2 = 0x04
PAC_PNEUMATIC_PUSHER = 0x08 # bit #3 on output port 0
...
def gpio_bit_on(port, bit):
r = gpio_in(port)
r |= bit
r = gpio_out(port)
def gpio_bit_off(port, bit):
r = gpio_in(port)
r &= ~bit
r = gpio_out(port)
class pac(object):
def everything_off(self):
gpio_out(PAC_OUTPUT_PORT_0, 0)
gpio_out(PAC_OUTPUT_PORT_1, 0)
gpio_out(PAC_OUTPUT_PORT_2, 0)
...
gpio_out(PAC_OUTPUT_PORT_7, 0)
def emergency_stop(self):
gpio_bit_on(PAC_OUTPUT_PORT_0, PAC_EMERGENCY_STOP)
def pusher_on(self):
gpio_bit_on(PAC_OUTPUT_PORT_0, PAC_PNEUMATIC_PUSHER)
def pusher_off(self):
gpio_bit_off(PAC_OUTPUT_PORT_0, PAC_PNEUMATIC_PUSHER)
Bit twiddling like this is pretty basic.
Ross Ridge
--
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db //
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