package com.loomcom.symon;
import com.loomcom.symon.devices.Acia;
import com.loomcom.symon.devices.Acia6551;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.mockito.Mockito.*;
public class AciaTest {
@Test
public void shouldTriggerInterruptOnRxFullIfRxIrqEnabled() throws Exception {
Bus mockBus = mock(Bus.class);
Acia acia = new Acia6551(0x000);
acia.setBus(mockBus);
// Disable TX IRQ, Enable RX IRQ
acia.write(2, 0x00);
acia.rxWrite('a');
verify(mockBus, atLeastOnce()).assertIrq();
}
@Test
public void shouldNotTriggerInterruptOnRxFullIfRxIrqNotEnabled() throws Exception {
Bus mockBus = mock(Bus.class);
Acia acia = new Acia6551(0x000);
acia.setBus(mockBus);
// Disable TX IRQ, Disable RX IRQ
acia.write(2, 0x02);
acia.rxWrite('a');
verify(mockBus, never()).assertIrq();
}
@Test
public void shouldTriggerInterruptOnTxEmptyIfTxIrqEnabled() throws Exception {
Bus mockBus = mock(Bus.class);
Acia acia = new Acia6551(0x000);
acia.setBus(mockBus);
// Enable TX IRQ, Disable RX IRQ
acia.write(2, 0x06);
// Write data
acia.write(0, 'a');
verify(mockBus, never()).assertIrq();
// Transmission should cause IRQ
acia.txRead();
verify(mockBus, atLeastOnce()).assertIrq();
}
@Test
public void shouldNotTriggerInterruptOnTxEmptyIfTxIrqNotEnabled() throws Exception {
Bus mockBus = mock(Bus.class);
Acia acia = new Acia6551(0x000);
acia.setBus(mockBus);
// Disable TX IRQ, Disable RX IRQ
acia.write(2, 0x02);
// Write data
acia.write(0, 'a');
// Transmission should cause IRQ
acia.txRead();
verify(mockBus, never()).assertIrq();
}
@Test
public void newAciaShouldHaveTxEmptyStatus() throws Exception {
Acia acia = new Acia6551(0x000);
assertEquals(0x10, acia.read(0x0001));
}
@Test
public void aciaShouldHaveTxEmptyStatusOffIfTxHasData() throws Exception {
Acia acia = new Acia6551(0x000);
acia.txWrite('a');
assertEquals(0x00, acia.read(0x0001));
}
@Test
public void aciaShouldHaveRxFullStatusOffIfRxHasData() throws Exception {
Acia acia = new Acia6551(0x000);
acia.rxWrite('a');
assertEquals(0x18, acia.read(0x0001));
}
@Test
public void aciaShouldHaveTxEmptyAndRxFullStatusOffIfRxAndTxHaveData()
throws Exception {
Acia acia = new Acia6551(0x000);
acia.rxWrite('a');
acia.txWrite('b');
assertEquals(0x08, acia.read(0x0001));
}
@Test
public void aciaShouldOverrunAndReadShouldReset()
throws Exception {
Acia acia = new Acia6551(0x0000);
// overrun ACIA
acia.rxWrite('a');
acia.rxWrite('b');
assertEquals(0x04, acia.read(0x0001) & 0x04);
// read should reset
acia.rxRead();
assertEquals(0x00, acia.read(0x0001) & 0x04);
}
@Test
public void readingBuffersShouldResetStatus()
throws Exception {
Acia acia = new Acia6551(0x0000);
acia.rxWrite('a');
acia.txWrite('b');
assertEquals(0x08, acia.read(0x0001));
assertEquals('a', acia.rxRead());
assertEquals('b', acia.txRead());
assertEquals(0x10, acia.read(0x0001));
}
}