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#include "pio.h"
#ifdef PIO_ASM_INTERFACE
/* old inline asm implementation */
inline void _pio_write(uint8_t reg, uint8_t data)
{
__asm
;; pop function arguments
pop hl
;; store data in A
ld a, h
ld h, #0
;; add ADDR_DEV_PIO to get the device address
ld bc, #ADDR_DEV_PIO
add hl, bc
;; load data
ld (hl), a
__endasm;
}
inline uint8_t _pio_read(uint8_t reg) __naked
{
__asm
;; pop function argument
pop l
ld h, #0
;; add ADDR_DEV_PIO to get the device address
ld bc, #ADDR_DEV_PIO
add hl, bc
ld l, (hl)
ret
__endasm;
}
#else
inline void _pio_write(uint8_t reg, uint8_t data)
{
*((uint8_t *) (ADDR_DEV_PIO + reg)) = data;
}
inline uint8_t _pio_read(uint8_t reg)
{
return *((uint8_t *) (ADDR_DEV_PIO + reg));
}
#endif
void pio_set_mode(int port, int mode, uint8_t io)
{
// 0x0F is a control sequence to set mode
_pio_write((PIO_REG_CTRL + port), ((mode << 6) | 0x0F));
// this mode requires an additional argument that sets
// a mode for each pin
if (mode == PIO_MODE_BIT_IO) {
_pio_write((PIO_REG_CTRL + port), io);
}
}
void pio_set_interrupts(int port, int control)
{
// 0x07 is a control sequence to set interrupts
_pio_write((PIO_REG_CTRL + port), (control<<4 | 0x07));
}
void pio_set_interrupts_mask(int port, int control, uint8_t mask)
{
// 0x17 is a control sequence to set interrupts
// AND interpret the next byte as a bitmask
_pio_write((PIO_REG_CTRL + port),(control | 0x17));
_pio_write((PIO_REG_CTRL + port), mask);
}
uint8_t pio_read(int port)
{
return _pio_read((PIO_REG_DATA + port));
}
void pio_write(int port, uint8_t data)
{
_pio_write((PIO_REG_DATA + port), data);
}
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