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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
Gaelco 3D serial hardware
***************************************************************************/
/***************************************************************************
DEVICE CONFIGURATION MACROS
***************************************************************************/
#define MCFG_GAELCO_SERIAL_IRQ_HANDLER(_devcb) \
devcb = &gaelco_serial_device::set_irq_handler(*device, DEVCB_##_devcb);
/* external status bits */
#define GAELCOSER_STATUS_READY 0x01
#define GAELCOSER_STATUS_RTS 0x02
/* only RTS currently understood ! */
//#define GAELCOSER_STATUS_DTR 0x04
#define GAELCOSER_EXT_STATUS_MASK 0x03
/* internal bits follow ... */
#define GAELCOSER_STATUS_IRQ_ENABLE 0x10
#define GAELCOSER_STATUS_RESET 0x20
#define GAELCOSER_STATUS_SEND 0x40
/***************************************************************************
DEVICE INTERFACE TYPE
***************************************************************************/
/* ----- device interface ----- */
struct buf_t
{
volatile uint8_t data;
volatile uint8_t stat;
volatile int cnt;
volatile int data_cnt;
};
struct shmem_t
{
buf_t buf[2];
};
struct osd_shared_mem
{
char *fn;
size_t size;
void *ptr;
int creator;
};
class gaelco_serial_device : public device_t
{
public:
gaelco_serial_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
~gaelco_serial_device() {}
template<class _Object> static devcb_base &set_irq_handler(device_t &device, _Object object) { return downcast<gaelco_serial_device &>(device).m_irq_handler.set_callback(object); }
DECLARE_READ8_MEMBER( status_r);
DECLARE_WRITE8_MEMBER( data_w);
DECLARE_READ8_MEMBER( data_r);
DECLARE_WRITE8_MEMBER( rts_w );
/* Set to 1 during transmit, 0 for receive */
DECLARE_WRITE8_MEMBER( tr_w);
/* Big questions marks, related to serial i/o */
/* Not used in surfplnt, but in radikalb
* Set at beginning of transfer sub, cleared at end
*/
DECLARE_WRITE8_MEMBER( unknown_w);
/* only used in radikalb, set at beginning of receive isr, cleared at end */
DECLARE_WRITE8_MEMBER( irq_enable );
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_stop() override;
virtual void device_reset() override;
private:
// internal state
devcb_write_line m_irq_handler;
uint8_t m_status;
int m_last_in_msg_cnt;
int m_slack_cnt;
emu_timer *m_sync_timer;
buf_t *m_in_ptr;
buf_t *m_out_ptr;
osd_shared_mem *m_os_shmem;
shmem_t *m_shmem;
std::mutex m_mutex;
TIMER_CALLBACK_MEMBER( set_status_cb );
TIMER_CALLBACK_MEMBER( link_cb );
void set_status(uint8_t mask, uint8_t set, int wait);
void process_in();
void sync_link();
};
extern const device_type GAELCO_SERIAL;
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