// Set the pullup/down resistor for a pin
//
// The GPIO Pull-up/down Clock Registers control the actuation of internal pull-downs on
// the respective GPIO pins. These registers must be used in conjunction with the GPPUD
// register to effect GPIO Pull-up/down changes. The following sequence of events is
// required:
// 1. Write to GPPUD to set the required control signal (i.e. Pull-up or Pull-Down or neither
// to remove the current Pull-up/down)
// 2. Wait 150 cycles ? this provides the required set-up time for the control signal
// 3. Write to GPPUDCLK0/1 to clock the control signal into the GPIO pads you wish to
// modify ? NOTE only the pads which receive a clock will be modified, all others will
// retain their previous state.
// 4. Wait 150 cycles ? this provides the required hold time for the control signal
// 5. Write to GPPUD to remove the control signal
// 6. Write to GPPUDCLK0/1 to remove the clock
//
// RPi has P1-03 and P1-05 with 1k8 pullup resistor
void bcm2835_gpio_set_pud(uint8_t pin, uint8_t pud)
{
bcm2835_gpio_pud(pud);
delayMicroseconds(10);
bcm2835_gpio_pudclk(pin, 1);
delayMicroseconds(10);
bcm2835_gpio_pud(BCM2835_GPIO_PUD_OFF);
bcm2835_gpio_pudclk(pin, 0);
}
static PyObject *
PyBCM2835_gpio_pud(PyObject *self, PyObject *args)
{
uint8_t pin;
if (!PyArg_ParseTuple(args,"i",&pin)) {
return NULL;
}
bcm2835_gpio_pud(pin);
Py_RETURN_NONE;
}
//void bcm2835_gpio_pud(uint8_t pud);
/// Call bcm2835_gpio_pud with 1 parameter
/// \par Refer
/// \par Modify
void ope_gpio_pud(void)
{
get_byte_code();
bcm2835_gpio_pud( *((uint8_t *)(buff+1)) );
}
