Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-10-05 16:50:57 +03:00
Code Issues Actions 3 Packages Projects Releases Wiki Activity

uses aer register to select which transition to generate an interrupt on [smf]

Browse Source
This commit is contained in:
smf- 2013-12-27 00:42:15 +00:00
parent 63ae866195
commit c0e2b18bc5
1 changed files with 15 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
src/emu/machine/mc68901.c
View File

@ -293,20 +293,26 @@ inline void mc68901_device::timer_input(int index, int value)
inline void mc68901_device::gpio_input(int bit, int state)
{
if (BIT(m_gpip, bit) && !state) // if transition from 1 to 0 is detected...
if (state != BIT(m_gpip, bit))
{
if (LOG) logerror("MC68901 '%s' Edge Transition Detected on GPIO%u\n", tag(), bit);
if (m_ier & INT_MASK_GPIO[bit]) // AND interrupt enabled bit is set...
if (state == BIT(m_aer, bit))
{
if (LOG) logerror("MC68901 '%s' Interrupt Pending for GPIO%u\n", tag(), bit);
if (LOG) logerror("MC68901 '%s' Edge Transition Detected on GPIO%u\n", tag(), bit);
take_interrupt(INT_MASK_GPIO[bit]); // set interrupt pending bit
if (m_ier & INT_MASK_GPIO[bit]) // AND interrupt enabled bit is set...
{
if (LOG) logerror("MC68901 '%s' Interrupt Pending for GPIO%u\n", tag(), bit);
take_interrupt(INT_MASK_GPIO[bit]); // set interrupt pending bit
}
}
}
m_gpip &= ((1 << bit) ^ 0xff);
m_gpip |= (state << bit);
if (state)
m_gpip &= ~(1 << bit);
else
m_gpip |= (1 << bit);
}
}