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Fixed typo and removed uneeded counter in exchange for a more clear TIN pin clock update interface

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This commit is contained in:
Joakim Larsson Edstrom 2016-11-30 22:08:28 +01:00
parent 6845eabdf1
commit 9b84f0bd72
2 changed files with 10 additions and 13 deletions
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11
src/devices/machine/68230pit.cpp
View File

@ -20,7 +20,7 @@
* - Complete support for clock and timers
* - Add interrupt support
* - Add DMA support
* - Add apropriate buffering for each submode
* - Add appropriate buffering for each submode
**********************************************************************/
#include "68230pit.h"
@ -240,18 +240,15 @@ void pit68230_device::pa_update_bit(uint8_t bit, uint8_t state){ if (state) m_pa
void pit68230_device::pb_update_bit(uint8_t bit, uint8_t state){ if (state) m_pbdr |= (1 << bit); else m_pbdr &= ~(1 << bit); }
void pit68230_device::pc_update_bit(uint8_t bit, uint8_t state){ if (state) m_pcdr |= (1 << bit); else m_pcdr &= ~(1 << bit); }
void pit68230_device::update_tin()
void pit68230_device::update_tin(uint8_t state)
{
static uint32_t counter = 0;
// Tick clock on falling edge. TODO: check what flank is correct
if (((counter & 1) != 0))
if (state == CLEAR_LINE)
{
tick_clock();
}
pc_update_bit(REG_PCDR_TIN_BIT, counter & 1);
counter++;
pc_update_bit(REG_PCDR_TIN_BIT, state == ASSERT_LINE ? 0 : 1);
}
#if VERBOSE > 2

12
src/devices/machine/68230pit.h
View File

@ -131,7 +131,7 @@ class pit68230_device : public device_t//, public device_execute_interface
void pa_update_bit(uint8_t bit, uint8_t state);
void pb_update_bit(uint8_t bit, uint8_t state);
void pc_update_bit(uint8_t bit, uint8_t state);
void update_tin();
void update_tin(uint8_t);
void wr_pitreg_pgcr(uint8_t data);
void wr_pitreg_psrr(uint8_t data);
@ -289,11 +289,11 @@ protected:
uint8_t m_pbdr; // Port B Data register
uint8_t m_pcdr; // Port C Data register
uint8_t m_psr; // Port Status Register
uint8_t m_tcr; // Timer Control Register
uint8_t m_tivr; // Timer Interrupt Vector register
int m_cpr; // Counter Preload Registers (3 x 8 = 24 bits)
int m_cntr; // - The 24 bit Counter
uint8_t m_tsr; // Timer Status Register
uint8_t m_tcr; // Timer Control Register
uint8_t m_tivr; // Timer Interrupt Vector register
int m_cpr; // Counter Preload Registers (3 x 8 = 24 bits)
int m_cntr; // - The 24 bit Counter
uint8_t m_tsr; // Timer Status Register
// Timers
emu_timer *pit_timer;