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#ifndef MACHINE_INTERFACE_INTERNAL_H_
#define MACHINE_INTERFACE_INTERNAL_H_
#include "util.h"
#include "machine_interface.h"
#define INTERRUPT_QUEUE_MAX_LEN 16
/** interrupt_queue_freecount - Returns count of free slots in TX queue.
* Count can change at any time, if IRQs are enabled.
*/
uint8_t interrupt_queue_freecount(void);
void send_interrupt_count(const struct control_interrupt *irq,
uint8_t size, uint8_t count);
/** send_interrupt - Send an interrupt to the host.
* This is the API for sending an interrupt.
*/
static inline
void send_interrupt(const struct control_interrupt *irq,
uint8_t size)
{
send_interrupt_count(irq, size, 1);
}
/** send_interrupt_discard_old - Send an interrupt to the host.
* Also discard already queued IRQs of the same type.
* It's not guaranteed that all old IRQs are discarded, though.
*/
void send_interrupt_discard_old(const struct control_interrupt *irq,
uint8_t size);
/** get_active_devflags - Get device flags atomically.
*/
uint16_t get_active_devflags(void);
static inline uint8_t get_active_devflags_low(void)
{
extern uint16_t active_devflags;
mb();
return lo8(active_devflags); /* atomic on AVR */
}
static inline uint8_t get_active_devflags_high(void)
{
extern uint16_t active_devflags;
mb();
return hi8(active_devflags); /* atomic on AVR */
}
/** devflag_is_set - Flag test optimized for constant mask.
* Inefficient for non-const mask! */
static inline bool devflag_is_set(const uint16_t mask)
{
bool res;
if (mask == 0)
res = 0;
else if (hi8(mask) == 0)
res = !!(get_active_devflags_low() & lo8(mask));
else if (lo8(mask) == 0)
res = !!(get_active_devflags_high() & hi8(mask));
else
res = !!(get_active_devflags() & mask);
return res;
}
/** modify_devflags - Modify device flags atomically
* and send notification interrupt to the host.
*/
void modify_devflags(uint16_t mask, uint16_t set);
/** reset_devflags - Reset device flags to defaults */
void reset_devflags(void);
#endif /* MACHINE_INTERFACE_INTERNAL_H_ */
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