mirror of
https://github.com/holub/mame
synced 2025-05-04 21:43:05 +03:00
129 lines
2.9 KiB
C++
129 lines
2.9 KiB
C++
#include "emu.h"
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#include "h8_watchdog.h"
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DEFINE_DEVICE_TYPE(H8_WATCHDOG, h8_watchdog_device, "h8_watchdog", "H8 watchdog")
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const int h8_watchdog_device::div_bh[8] = { 1, 6, 7, 9, 11, 13, 15, 17 };
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const int h8_watchdog_device::div_s [8] = { 1, 5, 6, 7, 8, 9, 11, 12 };
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h8_watchdog_device::h8_watchdog_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
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device_t(mconfig, H8_WATCHDOG, tag, owner, clock),
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cpu(*this, DEVICE_SELF_OWNER)
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{
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}
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void h8_watchdog_device::set_info(const char *_intc_tag, int _irq, int _type)
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{
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intc_tag = _intc_tag;
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irq = _irq;
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type = _type;
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}
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uint64_t h8_watchdog_device::internal_update(uint64_t current_time)
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{
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tcnt_update(current_time);
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if(tcsr & TCSR_TME) {
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int shift = (type == S ? div_s : div_bh)[tcsr & TCSR_CKS];
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uint64_t spos = tcnt_cycle_base >> shift;
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return (spos + 0x100 - tcnt) << shift;
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} else
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return 0;
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}
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void h8_watchdog_device::tcnt_update(uint64_t cur_time)
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{
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if(tcsr & TCSR_TME) {
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int shift = (type == S ? div_s : div_bh)[tcsr & TCSR_CKS];
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if(!cur_time)
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cur_time = cpu->total_cycles();
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uint64_t spos = tcnt_cycle_base >> shift;
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uint64_t epos = cur_time >> shift;
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int next_tcnt = tcnt + int(epos - spos);
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tcnt = next_tcnt;
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tcnt_cycle_base = cur_time;
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// logerror("%10lld tcnt %02x -> %03x shift=%d\n", cur_time, tcnt, next_tcnt, shift);
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if(next_tcnt >= 0x100) {
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logerror("watchdog triggered\n");
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if(tcsr & TCSR_WT) {
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if(type == B && !(tcsr & TCSR_NMI))
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intc->internal_interrupt(3);
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else
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cpu->reset();
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} else {
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if(!(tcsr & TCSR_OVF)) {
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tcsr |= TCSR_OVF;
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intc->internal_interrupt(irq);
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}
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}
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}
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} else
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tcnt = 0;
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}
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READ16_MEMBER(h8_watchdog_device::wd_r)
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{
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if (!machine().side_effects_disabled())
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{
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tcnt_update();
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logerror("read\n");
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}
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return 0;
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}
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WRITE16_MEMBER(h8_watchdog_device::wd_w)
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{
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if(mem_mask != 0xffff)
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return;
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if((data & 0xff00) == 0xa500) {
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tcnt_update();
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if(!(tcsr & TCSR_TME) && (data & TCSR_TME))
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tcnt_cycle_base = cpu->total_cycles();
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tcsr = data & 0xff;
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tcsr |= type == B ? 0x10 : 0x18;
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cpu->internal_update();
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}
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if((data & 0xff00) == 0x5a00) {
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if(tcsr & TCSR_TME) {
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tcnt = data & 0xff;
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tcnt_cycle_base = cpu->total_cycles();
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// logerror("%10lld tcnt = %02x\n", tcnt_cycle_base, tcnt);
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}
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cpu->internal_update();
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}
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}
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READ16_MEMBER(h8_watchdog_device::rst_r)
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{
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if (!machine().side_effects_disabled())
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logerror("rst_r\n");
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return 0;
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}
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WRITE16_MEMBER(h8_watchdog_device::rst_w)
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{
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if((data & 0xff00) == 0xa500)
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logerror("wowf_w %02x\n", data & 0xff);
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if((data & 0xff00) == 0x5a00)
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logerror("rtse_w %02x\n", data & 0xff);
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}
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void h8_watchdog_device::device_start()
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{
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intc = siblingdevice<h8_intc_device>(intc_tag);
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}
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void h8_watchdog_device::device_reset()
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{
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tcnt = 0x00;
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tcnt_cycle_base = cpu->total_cycles();
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tcsr = type == B ? 0x10 : 0x18;
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rst = type == S ? 0x1f : 0x3f;
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}
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