def pinMode(gpio_pin, direction, pull=0):
""" Sets given digital pin to input if direction=1, output otherwise.
'pull' will set the pull up/down resistor if setting as an input:
pull=-1 for pull-down, pull=1 for pull up, pull=0 for none. """
assert (gpio_pin in GPIO), "*Invalid GPIO pin: '%s'" % gpio_pin
if pinmux.export(gpio_pin):
addToCleanup(lambda: _unexport(gpio_pin))
if (direction == INPUT):
# Pinmux:
if (pull > 0): pull = CONF_PULLUP
elif (pull < 0): pull = CONF_PULLDOWN
else: pull = CONF_PULL_DISABLE
pinmux.pinMux(GPIO[gpio_pin][2], CONF_GPIO_INPUT | pull)
# Set input:
memory.orReg(GPIO[gpio_pin][0]+GPIO_OE, GPIO[gpio_pin][1])
return
# Pinmux:
pinmux.pinMux(GPIO[gpio_pin][2], CONF_GPIO_OUTPUT)
# Set output:
memory.clearReg(GPIO[gpio_pin][0]+GPIO_OE, GPIO[gpio_pin][1])
def pinMode(gpio_pin, direction, pull=0):
""" Sets given digital pin to input if direction=1, output otherwise.
'pull' will set the pull up/down resistor if setting as an input:
pull=-1 for pull-down, pull=1 for pull up, pull=0 for none. """
assert (gpio_pin in GPIO), "*Invalid GPIO pin: '%s'" % gpio_pin
if pinmux.export(gpio_pin):
addToCleanup(lambda: pinmux.unexport(gpio_pin))
if (direction == INPUT):
# Pinmux:
if (pull > 0): pull = CONF_PULLUP
elif (pull < 0): pull = CONF_PULLDOWN
else: pull = CONF_PULL_DISABLE
pinmux.pinMux(GPIO[gpio_pin][2], CONF_GPIO_INPUT | pull)
# Set input:
memory.orReg(GPIO[gpio_pin][0]+GPIO_OE, GPIO[gpio_pin][1])
return
# Pinmux:
pinmux.pinMux(GPIO[gpio_pin][2], CONF_GPIO_OUTPUT)
# Set output:
memory.clearReg(GPIO[gpio_pin][0]+GPIO_OE, GPIO[gpio_pin][1])
def analog_init():
""" Initializes the on-board 8ch 12bit ADC. """
# Enable ADC module clock, though should already be enabled on
# newer Angstrom images:
memory.setReg(CM_WKUP_ADC_TSC_CLKCTRL, MODULEMODE_ENABLE)
# Wait for enable complete:
while (memory.getReg(CM_WKUP_ADC_TSC_CLKCTRL) & IDLEST_MASK): delay(1)
# Software reset:
memory.setReg(ADC_SYSCONFIG, ADC_SOFTRESET)
while(memory.getReg(ADC_SYSCONFIG) & ADC_SOFTRESET): pass
# Make sure STEPCONFIG write protect is off:
memory.setReg(ADC_CTRL, ADC_STEPCONFIG_WRITE_PROTECT_OFF)
# Set STEPCONFIG1-STEPCONFIG8 to correspond to ADC inputs 0-7:
for i in xrange(8):
config = SEL_INP('AIN%i' % i) | ADC_AVG2
memory.setReg(eval('ADCSTEPCONFIG%i' % (i+1)), config)
memory.setReg(eval('ADCSTEPDELAY%i' % (i+1)), SAMPLE_DELAY(15))
# Now we can enable ADC subsystem, leaving write protect off:
memory.orReg(ADC_CTRL, TSC_ADC_SS_ENABLE)
def analog_init():
""" Initializes the on-board 8ch 12bit ADC. """
# Enable ADC module clock, though should already be enabled on
# newer Angstrom images:
memory.setReg(CM_WKUP_ADC_TSC_CLKCTRL, MODULEMODE_ENABLE)
# Wait for enable complete:
while (memory.getReg(CM_WKUP_ADC_TSC_CLKCTRL) & IDLEST_MASK): delay(1)
# Software reset:
memory.setReg(ADC_SYSCONFIG, ADC_SOFTRESET)
while(memory.getReg(ADC_SYSCONFIG) & ADC_SOFTRESET): pass
# Make sure STEPCONFIG write protect is off:
memory.setReg(ADC_CTRL, ADC_STEPCONFIG_WRITE_PROTECT_OFF)
# Set STEPCONFIG1-STEPCONFIG8 to correspond to ADC inputs 0-7:
for i in xrange(8):
config = SEL_INP('AIN%i' % i) | ADC_AVG2
memory.setReg(eval('ADCSTEPCONFIG%i' % (i+1)), config)
memory.setReg(eval('ADCSTEPDELAY%i' % (i+1)), SAMPLE_DELAY(15))
# Now we can enable ADC subsystem, leaving write protect off:
memory.orReg(ADC_CTRL, TSC_ADC_SS_ENABLE)
