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tests for the 6850 ACIA and fixes in ACIA behavior

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This commit is contained in:
Maik Merten 2014-07-16 21:51:34 +02:00
parent 31fdd87b41
commit 0d0fddc365
2 changed files with 149 additions and 2 deletions
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6
src/main/java/com/loomcom/symon/devices/Acia6850.java
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@ -97,9 +97,9 @@ public class Acia6850 extends Acia {
}
// Bit 7 controls receiver IRQ behavior
receiveIrqEnabled = (commandRegister & 0x80) == 0;
receiveIrqEnabled = (commandRegister & 0x80) != 0;
// Bits 5 & 6 controls transmit IRQ behavior
transmitIrqEnabled = (commandRegister & 0x20) == 0 && (commandRegister & 0x40) != 0;
transmitIrqEnabled = (commandRegister & 0x20) != 0 && (commandRegister & 0x40) == 0;
}
@ -127,6 +127,8 @@ public class Acia6850 extends Acia {
private synchronized void reset() {
overrun = false;
rxFull = false;
txEmpty = true;
}
}

145
src/test/java/com/loomcom/symon/AciaTest6850.java Normal file
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@ -0,0 +1,145 @@
package com.loomcom.symon;
import com.loomcom.symon.devices.Acia;
import com.loomcom.symon.devices.Acia6850;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.mockito.Mockito.*;
public class AciaTest6850 {
private final static int CMD_STAT_REG = 0;
private final static int DATA_REG = 1;
private Acia newAcia() throws Exception {
Acia acia = new Acia6850(0x0000);
// by default rate is limited, have it unlimited for testing
acia.setBaudRate(0);
return acia;
}
@Test
public void shouldTriggerInterruptOnRxFullIfRxIrqEnabled() throws Exception {
Bus mockBus = mock(Bus.class);
Acia acia = newAcia();
acia.setBus(mockBus);
// Disable TX IRQ, Enable RX IRQ
acia.write(CMD_STAT_REG, 0x80);
acia.rxWrite('a');
verify(mockBus, atLeastOnce()).assertIrq();
}
@Test
public void shouldNotTriggerInterruptOnRxFullIfRxIrqNotEnabled() throws Exception {
Bus mockBus = mock(Bus.class);
Acia acia = newAcia();
acia.setBus(mockBus);
// Disable TX IRQ, Disable RX IRQ
acia.write(CMD_STAT_REG, 0x00);
acia.rxWrite('a');
verify(mockBus, never()).assertIrq();
}
@Test
public void shouldTriggerInterruptOnTxEmptyIfTxIrqEnabled() throws Exception {
Bus mockBus = mock(Bus.class);
Acia acia = newAcia();
acia.setBus(mockBus);
// Enable TX IRQ, Disable RX IRQ
acia.write(CMD_STAT_REG, 0x20);
// Write data
acia.write(1, '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 = newAcia();
acia.setBus(mockBus);
// Disable TX IRQ, Disable RX IRQ
acia.write(CMD_STAT_REG, 0x02);
// Write data
acia.write(DATA_REG, 'a');
// Transmission should cause IRQ
acia.txRead();
verify(mockBus, never()).assertIrq();
}
@Test
public void newAciaShouldHaveTxEmptyStatus() throws Exception {
Acia acia = newAcia();
assertEquals(0x02, acia.read(CMD_STAT_REG) & 0x02);
}
@Test
public void aciaShouldHaveTxEmptyStatusOffIfTxHasData() throws Exception {
Acia acia = newAcia();
acia.txWrite('a');
assertEquals(0x00, acia.read(CMD_STAT_REG) & 0x02);
}
@Test
public void aciaShouldHaveRxFullStatusOnIfRxHasData() throws Exception {
Acia acia = newAcia();
acia.rxWrite('a');
assertEquals(0x01, acia.read(CMD_STAT_REG) & 0x01);
}
@Test
public void aciaShouldHaveTxEmptyAndRxFullStatusOffIfRxAndTxHaveData()
throws Exception {
Acia acia = newAcia();
acia.rxWrite('a');
acia.txWrite('b');
assertEquals(0x01, acia.read(CMD_STAT_REG) & 0x03);
}
@Test
public void readingBuffersShouldResetStatus()
throws Exception {
Acia acia = newAcia();
assertEquals(0x00, acia.read(CMD_STAT_REG) & 0x01);
acia.rxWrite('a');
assertEquals(0x01, acia.read(CMD_STAT_REG) & 0x01);
acia.rxRead();
assertEquals(0x00, acia.read(CMD_STAT_REG) & 0x01);
}
}