// license:BSD-3-Clause
// copyright-holders:James Wallace
/***************************************************************************
Motorola 6840 (PTM)
Programmable Timer Module
***************************************************************************/
#pragma once
#ifndef __6840PTM_H__
#define __6840PTM_H__
//**************************************************************************
// DEVICE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_PTM6840_EXTERNAL_CLOCKS(_clk0, _clk1, _clk2) \
ptm6840_device::set_external_clocks(*device, _clk0, _clk1, _clk2);
#define MCFG_PTM6840_OUT0_CB(_devcb) \
devcb = &ptm6840_device::set_out_callback(*device, 0, DEVCB_##_devcb);
#define MCFG_PTM6840_OUT1_CB(_devcb) \
devcb = &ptm6840_device::set_out_callback(*device, 1, DEVCB_##_devcb);
#define MCFG_PTM6840_OUT2_CB(_devcb) \
devcb = &ptm6840_device::set_out_callback(*device, 2, DEVCB_##_devcb);
#define MCFG_PTM6840_IRQ_CB(_devcb) \
devcb = &ptm6840_device::set_irq_callback(*device, DEVCB_##_devcb);
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> ptm6840_device
class ptm6840_device : public device_t
{
public:
// construction/destruction
ptm6840_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
static void set_external_clocks(device_t &device, double clock0, double clock1, double clock2) { downcast<ptm6840_device &>(device).m_external_clock[0] = clock0; downcast<ptm6840_device &>(device).m_external_clock[1] = clock1; downcast<ptm6840_device &>(device).m_external_clock[2] = clock2; }
template<class _Object> static devcb_base &set_out_callback(device_t &device, int index, _Object object) { return downcast<ptm6840_device &>(device).m_out_cb[index].set_callback(object); }
template<class _Object> static devcb_base &set_irq_callback(device_t &device, _Object object) { return downcast<ptm6840_device &>(device).m_irq_cb.set_callback(object); }
int status(int clock) const { return m_enabled[clock]; } // get whether timer is enabled
int irq_state() const { return m_irq; } // get IRQ state
uint16_t count(int counter) const { return compute_counter(counter); } // get counter value
void set_ext_clock(int counter, double clock); // set clock frequency
int ext_clock(int counter) const { return m_external_clock[counter]; } // get clock frequency
DECLARE_WRITE8_MEMBER( write );
void write(offs_t offset, uint8_t data) { write(machine().dummy_space(), offset, data); }
DECLARE_READ8_MEMBER( read );
uint8_t read(offs_t offset) { return read(machine().dummy_space(), offset); }
void set_gate(int idx, int state);
DECLARE_WRITE_LINE_MEMBER( set_g1 );
DECLARE_WRITE_LINE_MEMBER( set_g2 );
DECLARE_WRITE_LINE_MEMBER( set_g3 );
void set_clock(int idx, int state);
DECLARE_WRITE_LINE_MEMBER( set_c1 );
DECLARE_WRITE_LINE_MEMBER( set_c2 );
DECLARE_WRITE_LINE_MEMBER( set_c3 );
void update_interrupts();
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
private:
void subtract_from_counter(int counter, int count);
void tick(int counter, int count);
void timeout(int idx);
uint16_t compute_counter(int counter) const;
void reload_count(int idx);
enum
{
PTM_6840_CTRL1 = 0,
PTM_6840_CTRL2 = 1,
PTM_6840_STATUS = 1,
PTM_6840_MSBBUF1 = 2,
PTM_6840_LSB1 = 3,
PTM_6840_MSBBUF2 = 4,
PTM_6840_LSB2 = 5,
PTM_6840_MSBBUF3 = 6,
PTM_6840_LSB3 = 7
};
enum
{
RESET_TIMERS = 0x01,
CR1_SELECT = 0x01,
T3_PRESCALE_EN = 0x01,
INTERNAL_CLK_EN = 0x02,
COUNT_MODE_8BIT = 0x04,
INTERRUPT_EN = 0x40,
COUNT_OUT_EN = 0x80
};
enum
{
TIMER1_IRQ = 0x01,
TIMER2_IRQ = 0x02,
TIMER3_IRQ = 0x04,
ANY_IRQ = 0x80
};
double m_external_clock[3];
devcb_write_line m_out_cb[3];
devcb_write_line m_irq_cb;
uint8_t m_control_reg[3];
uint8_t m_output[3]; // Output states
uint8_t m_gate[3]; // Input gate states
uint8_t m_clk[3]; // Clock states
uint8_t m_enabled[3];
uint8_t m_mode[3];
uint8_t m_fired[3];
uint8_t m_t3_divisor;
uint8_t m_t3_scaler;
uint8_t m_irq;
uint8_t m_status_reg;
uint8_t m_status_read_since_int;
uint8_t m_lsb_buffer;
uint8_t m_msb_buffer;
// Each PTM has 3 timers
emu_timer *m_timer[3];
uint16_t m_latch[3];
uint16_t m_counter[3];
static const char *const opmode[];
};
// device type definition
extern const device_type PTM6840;
#endif /* __6840PTM_H__ */