static int lpc17_configalternate(lpc17_pinset_t cfgset, unsigned int port,
unsigned int pin, uint32_t alt)
{
/* First, configure the port as an input so that we have a known
* starting point and consistent behavior during the re-configuration.
*/
(void)lpc17_configinput(DEFAULT_INPUT, port, pin);
/* Set up PINSEL registers */
/* Configure as GPIO */
lpc17_pinsel(port, pin, alt);
/* Set pull-up mode */
lpc17_pullup(cfgset, port, pin);
/* Check for open drain output */
if ((cfgset & GPIO_OPEN_DRAIN) != 0)
{
/* Select open drain output */
lpc17_setopendrain(port, pin);
}
return OK;
}
static inline int lpc17_configoutput(lpc17_pinset_t cfgset, unsigned int port,
unsigned int pin)
{
uint32_t fiobase;
uint32_t regval;
/* First, configure the port as a generic input so that we have a known
* starting point and consistent behavior during the re-configuration.
*/
(void)lpc17_configinput(DEFAULT_INPUT, port, pin);
/* Check for open drain output */
if ((cfgset & GPIO_OPEN_DRAIN) != 0)
{
/* Set pull-up mode. This normally only applies to input pins, but does have
* meaning if the port is an open drain output.
*/
lpc17_pullup(cfgset, port, pin);
/* Select open drain output */
lpc17_setopendrain(port, pin);
}
/* Set the initial value of the output */
lpc17_gpiowrite(cfgset, ((cfgset & GPIO_VALUE) != GPIO_VALUE_ZERO));
/* Now, reconfigure the pin as an output */
fiobase = g_fiobase[port];
regval = getreg32(fiobase + LPC17_FIO_DIR_OFFSET);
regval |= (1 << pin);
putreg32(regval, fiobase + LPC17_FIO_DIR_OFFSET);
return OK;
}
