gpio.c
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/*
* Copyright (C) 2016 Leon George
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup cpu_cc26x0
* @ingroup drivers_periph_gpio
* @{
*
* @file
* @brief Low-level GPIO driver implementation
*
* @author Leon M. George <leon@georgemail.eu>
*
* @}
*/
#include "cpu.h"
#include "periph/gpio.h"
#define GPIO_ISR_CHAN_NUMOF (32)
#define DOE_SHIFT (29U)
/**
* @brief static callback memory
*/
static gpio_isr_ctx_t gpio_chan[GPIO_ISR_CHAN_NUMOF];
int gpio_init(gpio_t pin, gpio_mode_t mode)
{
if ((unsigned int)pin > 31)
return -1;
/* enable GPIO clock */
PRCM->PDCTL0 |= PDCTL0_PERIPH_ON;
while(!(PRCM->PDSTAT0 & PDSTAT0_PERIPH_ON)) ;
PRCM->GPIOCLKGR |= 1;
PRCM->CLKLOADCTL |= CLKLOADCTL_LOAD;
while (!(PRCM->CLKLOADCTL & CLKLOADCTL_LOADDONE)) ;
/* configure the GPIO mode */
IOC->CFG[pin] = mode;
GPIO->DOE &= ~(1 << pin);
GPIO->DOE |= ((~(mode >> DOE_SHIFT) & 0x1) << pin);
return 0;
}
int gpio_init_int(gpio_t pin, gpio_mode_t mode, gpio_flank_t flank,
gpio_cb_t cb, void *arg)
{
int init = gpio_init(pin, mode);
if (init != 0)
return init;
NVIC_EnableIRQ(EDGE_DETECT_IRQN);
IOC->CFG[pin] |= flank;
gpio_chan[pin].cb = cb;
gpio_chan[pin].arg = arg;
/* clears the interrupt flag */
GPIO->EVFLAGS |= (1 << pin);
gpio_irq_enable(pin);
return 0;
}
void gpio_irq_enable(gpio_t pin)
{
IOC->CFG[pin] |= IOCFG_EDGEIRQ_ENABLE;
}
void gpio_irq_disable(gpio_t pin)
{
IOC->CFG[pin] &= ~IOCFG_EDGEIRQ_ENABLE;
}
int gpio_read(gpio_t pin)
{
if (GPIO->DOE & (1 << pin)) {
return (GPIO->DOUT >> pin) & 1;
}
else {
return (GPIO->DIN >> pin) & 1;
}
}
void gpio_set(gpio_t pin)
{
GPIO->DOUTSET = (1 << pin);
}
void gpio_clear(gpio_t pin)
{
GPIO->DOUTCLR = (1 << pin);
}
void gpio_toggle(gpio_t pin)
{
GPIO->DOUTTGL = (1 << pin);
}
void gpio_write(gpio_t pin, int value)
{
if (value) {
GPIO->DOUTSET = (1 << pin);
} else {
GPIO->DOUTCLR = (1 << pin);
}
}
void isr_edge(void)
{
for (unsigned pin = 0; pin < GPIO_ISR_CHAN_NUMOF; pin++) {
/* doc claims EVFLAGS will only be set for pins that have edge detection enabled */
if (GPIO->EVFLAGS & (1 << pin)) {
GPIO->EVFLAGS |= (1 << pin);
gpio_chan[pin].cb(gpio_chan[pin].arg);
}
}
cortexm_isr_end();
}