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#include <cstdint>
#include "avalon.hpp"
#include "interval_timer.hpp"
namespace taller::avalon
{
interval_timer::interval_timer(std::uint32_t base) noexcept
: slave(base, 32, 4)
{}
void interval_timer::tick() noexcept
{
if(!status_run)
{
return;
} else if(count > 0)
{
--count;
} else
{
count = period;
status_to = 1;
status_run = control_cont;
}
}
bool interval_timer::read(std::uint32_t addr, std::uint32_t &data) noexcept
{
switch(addr)
{
case 0:
data
= status_run << 1
| status_to << 0;
break;
case 1:
data
= control_cont << 1
| control_ito << 0;
break;
case 2:
data = period & 0xffff;
break;
case 3:
data = period >> 16;
break;
case 4:
data = snap & 0xffff;
break;
case 5:
data = snap >> 16;
break;
}
return true;
}
bool interval_timer::write(std::uint32_t addr, std::uint32_t data, unsigned byte_enable) noexcept
{
switch(addr)
{
case 0:
status_to = 0;
break;
case 1:
control_ito = !!(data & (1 << 0));
control_cont = !!(data & (1 << 1));
status_run = (status_run && !!(data & (1 << 3))) || !!(data & (1 << 2));
break;
case 2:
period = (period & 0xffff'0000) | (data & 0xffff);
count = period;
break;
case 3:
period = (period & 0xffff) | (data & 0xffff) << 16;
count = period;
break;
case 4:
case 5:
snap = count;
break;
}
return true;
}
bool interval_timer::irq() noexcept
{
return control_ito && status_to;
}
}
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