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Ensures timer divisor values don't go out of range, adds timer interrupts.

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I suspect further timer issues remain.
This commit is contained in:
Thomas Harte 2019-10-26 23:20:13 -04:00
parent 909685d87d
commit 22754683f8
2 changed files with 14 additions and 6 deletions
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18
Components/68901/MFP68901.cpp
View File

@ -140,7 +140,7 @@ void MFP68901::write(int address, uint8_t value) {
const auto timer = address - 0xc;
const bool reset = value & 0x10;
switch(value & 0xf) {
case 0x0: set_timer_mode(timer, TimerMode::Stopped, 0, reset); break;
case 0x0: set_timer_mode(timer, TimerMode::Stopped, 1, reset); break;
case 0x1: set_timer_mode(timer, TimerMode::Delay, 4, reset); break;
case 0x2: set_timer_mode(timer, TimerMode::Delay, 10, reset); break;
case 0x3: set_timer_mode(timer, TimerMode::Delay, 16, reset); break;
@ -148,7 +148,7 @@ void MFP68901::write(int address, uint8_t value) {
case 0x5: set_timer_mode(timer, TimerMode::Delay, 64, reset); break;
case 0x6: set_timer_mode(timer, TimerMode::Delay, 100, reset); break;
case 0x7: set_timer_mode(timer, TimerMode::Delay, 200, reset); break;
case 0x8: set_timer_mode(timer, TimerMode::EventCount, 0, reset); break;
case 0x8: set_timer_mode(timer, TimerMode::EventCount, 1, reset); break;
case 0x9: set_timer_mode(timer, TimerMode::PulseWidth, 4, reset); break;
case 0xa: set_timer_mode(timer, TimerMode::PulseWidth, 10, reset); break;
case 0xb: set_timer_mode(timer, TimerMode::PulseWidth, 16, reset); break;
@ -160,7 +160,7 @@ void MFP68901::write(int address, uint8_t value) {
} break;
case 0x0e:
switch(value & 7) {
case 0: set_timer_mode(3, TimerMode::Stopped, 0, false); break;
case 0: set_timer_mode(3, TimerMode::Stopped, 1, false); break;
case 1: set_timer_mode(3, TimerMode::Delay, 4, false); break;
case 2: set_timer_mode(3, TimerMode::Delay, 10, false); break;
case 3: set_timer_mode(3, TimerMode::Delay, 16, false); break;
@ -170,7 +170,7 @@ void MFP68901::write(int address, uint8_t value) {
case 7: set_timer_mode(3, TimerMode::Delay, 200, false); break;
}
switch((value >> 4) & 7) {
case 0: set_timer_mode(2, TimerMode::Stopped, 0, false); break;
case 0: set_timer_mode(2, TimerMode::Stopped, 1, false); break;
case 1: set_timer_mode(2, TimerMode::Delay, 4, false); break;
case 2: set_timer_mode(2, TimerMode::Delay, 10, false); break;
case 3: set_timer_mode(2, TimerMode::Delay, 16, false); break;
@ -247,7 +247,15 @@ void MFP68901::set_timer_event_input(int channel, bool value) {
void MFP68901::decrement_timer(int timer) {
--timers_[timer].value;
if(!timers_[timer].value) {
// TODO: interrupt. Reload, possibly.
switch(timer) {
case 0: begin_interrupts(Interrupt::TimerA); break;
case 1: begin_interrupts(Interrupt::TimerB); break;
case 2: begin_interrupts(Interrupt::TimerC); break;
case 3: begin_interrupts(Interrupt::TimerD); break;
}
if(timers_[timer].mode == TimerMode::Delay) {
timers_[timer].value = timers_[timer].reload_value;
}
}
}

2
Components/68901/MFP68901.hpp
View File

@ -57,7 +57,7 @@ class MFP68901 {
uint8_t value = 0;
uint8_t reload_value = 0;
int prescale = 1;
int divisor = 0;
int divisor = 1;
bool event_input = false;
} timers_[4];