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;
}
int lpc17_configgpio(lpc17_pinset_t cfgset)
{
unsigned int port;
unsigned int pin;
int ret = -EINVAL;
/* Verify that this hardware supports the select GPIO port */
port = (cfgset & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
if (port < GPIO_NPORTS)
{
/* Get the pin number and select the port configuration register for that pin */
pin = (cfgset & GPIO_PIN_MASK) >> GPIO_PIN_SHIFT;
/* Handle according to pin function */
switch (cfgset & GPIO_FUNC_MASK)
{
case GPIO_INPUT: /* GPIO input pin */
ret = lpc17_configinput(cfgset, port, pin);
break;
case GPIO_INTFE: /* GPIO interrupt falling edge */
case GPIO_INTRE: /* GPIO interrupt rising edge */
case GPIO_INTBOTH: /* GPIO interrupt both edges */
ret = lpc17_configinterrupt(cfgset, port, pin);
break;
case GPIO_OUTPUT: /* GPIO outpout pin */
ret = lpc17_configoutput(cfgset, port, pin);
break;
case GPIO_ALT1: /* Alternate function 1 */
ret = lpc17_configalternate(cfgset, port, pin, PINCONN_PINSEL_ALT1);
break;
case GPIO_ALT2: /* Alternate function 2 */
ret = lpc17_configalternate(cfgset, port, pin, PINCONN_PINSEL_ALT2);
break;
case GPIO_ALT3: /* Alternate function 3 */
ret = lpc17_configalternate(cfgset, port, pin, PINCONN_PINSEL_ALT3);
break;
default:
break;
}
}
static inline int lpc17_configinterrupt(lpc17_pinset_t cfgset, unsigned int port,
unsigned int pin)
{
/* 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(cfgset, port, pin);
/* Then just remember the rising/falling edge interrupt enabled */
DEBUGASSERT(port == 0 || port == 2);
#ifdef CONFIG_GPIO_IRQ
lpc17_setintedge(port, pin, (cfgset & GPIO_EDGE_MASK) >> GPIO_EDGE_SHIFT);
#endif
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;
}
