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Merge pull request #7590 from lebrush/fix/atmega-gpio-misc

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GPIO interrupt fixes for atmega328p
This commit is contained in:
lebrush 2017-09-15 11:59:11 +02:00 committed by GitHub
commit c054e38156
2 changed files with 46 additions and 32 deletions
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18
cpu/atmega_common/include/periph_cpu_common.h
View File

@ -32,6 +32,24 @@ extern "C" {
*/
#define GPIO_PIN(x, y) ((x << 4) | y)
/**
* @brief Override the GPIO flanks
*
* This device has an additional mode in which the interrupt is triggered
* when the pin is low.
*
* Enumeration order is important, do not modify.
* @{
*/
#define HAVE_GPIO_FLANK_T
typedef enum {
GPIO_LOW, /**< emit interrupt when pin low */
GPIO_BOTH, /**< emit interrupt on both flanks */
GPIO_FALLING, /**< emit interrupt on falling flank */
GPIO_RISING, /**< emit interrupt on rising flank */
} gpio_flank_t;
/** @} */
/**
* @brief Use some common SPI functions
* @{

62
cpu/atmega_common/periph/gpio.c
View File

@ -138,6 +138,9 @@ int gpio_init_int(gpio_t pin, gpio_mode_t mode, gpio_flank_t flank,
if ((_port_num(pin) == PORT_D && pin_num > 3)
#if defined (PORTE)
|| (_port_num(pin) == PORT_E && pin_num < 4)
|| (_port_num(pin) != PORT_D && _port_num(pin) != PORT_E)
#elif defined(CPU_ATMEGA328P)
|| (pin_num < 2) || (_port_num(pin) != PORT_D)
#endif
|| ((mode != GPIO_IN) && (mode != GPIO_IN_PU))) {
return -1;
@ -148,43 +151,26 @@ int gpio_init_int(gpio_t pin, gpio_mode_t mode, gpio_flank_t flank,
/* clear global interrupt flag */
cli();
#if defined(CPU_ATMEGA328P)
/* INT pins start at PD2 instead of at PD0 */
pin_num -= 2;
#endif
EIMSK |= (1 << pin_num);
/* configure the flank */
switch (flank) {
case GPIO_RISING:
if (pin_num < 4) {
EICRA |= (3 << pin_num * 2);
}
#if defined(EICRB)
else {
EICRB |= (3 << (pin_num * 2) % 4);
}
#endif
break;
case GPIO_FALLING:
if (pin_num < 4) {
EICRA |= (2 << pin_num * 2);
}
#if defined(EICRB)
else {
EICRB |= (2 << (pin_num * 2) % 4);
}
#endif
break;
case GPIO_BOTH:
if (pin_num < 4) {
EICRA |= (1 << pin_num * 2);
}
#if defined(EICRB)
else {
EICRB |= (1 << (pin_num * 2) % 4);
}
#endif
break;
default:
if (flank > GPIO_RISING) {
return -1;
};
}
if (pin_num < 4) {
EICRA |= (flank << (pin_num * 2));
}
#if defined(EICRB)
else {
EICRB |= (flank << (pin_num * 2) % 4);
}
#endif
/* set callback */
config[pin_num].cb = cb;
@ -198,12 +184,22 @@ int gpio_init_int(gpio_t pin, gpio_mode_t mode, gpio_flank_t flank,
void gpio_irq_enable(gpio_t pin)
{
#if defined(CPU_ATMEGA328P)
/* INT pins start at PD2 instead of at PD0 */
EIMSK |= (1 << (_pin_num(pin) - 2));
#else
EIMSK |= (1 << _pin_num(pin));
#endif
}
void gpio_irq_disable(gpio_t pin)
{
#if defined(CPU_ATMEGA328P)
/* INT pins start at PD2 instead of at PD0 */
EIMSK &= ~(1 << (_pin_num(pin) - 2));
#else
EIMSK &= ~(1 << _pin_num(pin));
#endif
}
int gpio_read(gpio_t pin)