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upd7810: remove code duplication in timers 0 and 1

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This commit is contained in:
Ramiro Polla 2014-10-30 16:00:15 +01:00
parent 81e9c27162
commit 2d4007980d
2 changed files with 65 additions and 100 deletions
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162
src/emu/cpu/upd7810/upd7810.c
View File

@ -1174,6 +1174,64 @@ void upd7810_device::upd7810_sio_input()
}
}
void upd7810_device::upd7810_handle_timer0(int cycles, int clkdiv)
{
OVC0 += cycles;
while (OVC0 >= clkdiv)
{
OVC0 -= clkdiv;
CNT0++;
if (CNT0 == TM0)
{
CNT0 = 0;
IRR |= INTFT0;
/* timer F/F source is timer 0 ? */
if (0x00 == (TMM & 0x03))
{
TO ^= 1;
m_to_func(TO);
}
/* timer 1 chained with timer 0 ? */
if ((TMM & 0xe0) == 0x60)
{
CNT1++;
if (CNT1 == TM1)
{
CNT1 = 0;
IRR |= INTFT1;
/* timer F/F source is timer 1 ? */
if (0x01 == (TMM & 0x03))
{
TO ^= 1;
m_to_func(TO);
}
}
}
}
}
}
void upd7810_device::upd7810_handle_timer1(int cycles, int clkdiv)
{
OVC1 += cycles;
while (OVC1 >= clkdiv)
{
OVC1 -= clkdiv;
CNT1++;
if (CNT1 == TM1)
{
CNT1 = 0;
IRR |= INTFT1;
/* timer F/F source is timer 1 ? */
if (0x01 == (TMM & 0x03))
{
TO ^= 1;
m_to_func(TO);
}
}
}
}
void upd7810_device::handle_timers(int cycles)
{
/**** TIMER 0 ****/
@ -1184,74 +1242,10 @@ void upd7810_device::handle_timers(int cycles)
switch (TMM & 0x0c) /* timer 0 clock source */
{
case 0x00: /* clock divided by 12 */
OVC0 += cycles;
while (OVC0 >= 12)
{
OVC0 -= 12;
CNT0++;
if (CNT0 == TM0)
{
CNT0 = 0;
IRR |= INTFT0;
/* timer F/F source is timer 0 ? */
if (0x00 == (TMM & 0x03))
{
TO ^= 1;
m_to_func(TO);
}
/* timer 1 chained with timer 0 ? */
if ((TMM & 0xe0) == 0x60)
{
CNT1++;
if (CNT1 == TM1)
{
IRR |= INTFT1;
CNT1 = 0;
/* timer F/F source is timer 1 ? */
if (0x01 == (TMM & 0x03))
{
TO ^= 1;
m_to_func(TO);
}
}
}
}
}
upd7810_handle_timer0(cycles, 12);
break;
case 0x04: /* clock divided by 384 */
OVC0 += cycles;
while (OVC0 >= 384)
{
OVC0 -= 384;
CNT0++;
if (CNT0 == TM0)
{
CNT0 = 0;
IRR |= INTFT0;
/* timer F/F source is timer 0 ? */
if (0x00 == (TMM & 0x03))
{
TO ^= 1;
m_to_func(TO);
}
/* timer 1 chained with timer 0 ? */
if ((TMM & 0xe0) == 0x60)
{
CNT1++;
if (CNT1 == TM1)
{
CNT1 = 0;
IRR |= INTFT1;
/* timer F/F source is timer 1 ? */
if (0x01 == (TMM & 0x03))
{
TO ^= 1;
m_to_func(TO);
}
}
}
}
}
upd7810_handle_timer0(cycles, 384);
break;
case 0x08: /* external signal at TI */
break;
@ -1268,42 +1262,10 @@ void upd7810_device::handle_timers(int cycles)
switch (TMM & 0x60) /* timer 1 clock source */
{
case 0x00: /* clock divided by 12 */
OVC1 += cycles;
while (OVC1 >= 12)
{
OVC1 -= 12;
CNT1++;
if (CNT1 == TM1)
{
CNT1 = 0;
IRR |= INTFT1;
/* timer F/F source is timer 1 ? */
if (0x01 == (TMM & 0x03))
{
TO ^= 1;
m_to_func(TO);
}
}
}
upd7810_handle_timer1(cycles, 12);
break;
case 0x20: /* clock divided by 384 */
OVC1 += cycles;
while (OVC1 >= 384)
{
OVC1 -= 384;
CNT1++;
if (CNT1 == TM1)
{
CNT1 = 0;
IRR |= INTFT1;
/* timer F/F source is timer 1 ? */
if (0x01 == (TMM & 0x03))
{
TO ^= 1;
m_to_func(TO);
}
}
}
upd7810_handle_timer1(cycles, 384);
break;
case 0x40: /* external signal at TI */
break;

3
src/emu/cpu/upd7810/upd7810.h
View File

@ -169,6 +169,9 @@ protected:
virtual void handle_timers(int cycles);
virtual void upd7810_take_irq();
void upd7810_handle_timer0(int cycles, int clkdiv);
void upd7810_handle_timer1(int cycles, int clkdiv);
devcb_write_line m_to_func;
devcb_write_line m_txd_func;
devcb_read_line m_rxd_func;