diff options
| -rw-r--r-- | src/cpu/instruction.spec.ts | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/src/cpu/instruction.spec.ts b/src/cpu/instruction.spec.ts index 18ff76b..f257245 100644 --- a/src/cpu/instruction.spec.ts +++ b/src/cpu/instruction.spec.ts @@ -80,6 +80,41 @@ describe('avrInstruction', () => { expect(cpu.data[SREG]).toEqual(SREG_H | SREG_Z | SREG_C); }); + it('should execute `ADD r0, r1` instruction when result overflows', () => { + loadProgram('ADD r0, r1'); + cpu.data[r0] = 11; + cpu.data[r1] = 245; + avrInstruction(cpu); + expect(cpu.pc).toEqual(1); + expect(cpu.cycles).toEqual(1); + expect(cpu.data[r0]).toEqual(0); + expect(cpu.data[SREG]).toEqual(SREG_H | SREG_Z | SREG_C); + }); + + it('should execute `ADD r0, r1` instruction when carry is on', () => { + loadProgram('ADD r0, r1'); + cpu.data[r0] = 11; + cpu.data[r1] = 244; + cpu.data[SREG] = SREG_C; + avrInstruction(cpu); + expect(cpu.pc).toEqual(1); + expect(cpu.cycles).toEqual(1); + expect(cpu.data[r0]).toEqual(255); + expect(cpu.data[SREG]).toEqual(SREG_S | SREG_N); + }); + + it('should execute `ADD r0, r1` instruction when carry is on and the result overflows', () => { + loadProgram('ADD r0, r1'); + cpu.data[r0] = 11; + cpu.data[r1] = 245; + cpu.data[SREG] = SREG_C; + avrInstruction(cpu); + expect(cpu.pc).toEqual(1); + expect(cpu.cycles).toEqual(1); + expect(cpu.data[r0]).toEqual(0); + expect(cpu.data[SREG]).toEqual(SREG_H | SREG_Z | SREG_C); + }); + it('should execute `BCLR 2` instruction', () => { loadProgram('BCLR 2'); cpu.data[SREG] = 0xff; @@ -991,6 +1026,17 @@ describe('avrInstruction', () => { expect(cpu.data[Z]).toEqual(0x50); // verify that Z was unchanged }); + it('should execute `SUB r0, r1` instruction when result overflows', () => { + loadProgram('SUB r0, r1'); + cpu.data[r0] = 0; + cpu.data[r1] = 10; + avrInstruction(cpu); + expect(cpu.pc).toEqual(1); + expect(cpu.cycles).toEqual(1); + expect(cpu.data[r0]).toEqual(246); + expect(cpu.data[SREG]).toEqual(SREG_S | SREG_N | SREG_C); + }); + it('should execute `SWAP r1` instruction', () => { loadProgram('SWAP r1'); cpu.data[r1] = 0xa5; @@ -1000,6 +1046,14 @@ describe('avrInstruction', () => { expect(cpu.data[r1]).toEqual(0x5a); }); + it('should execute `WDR` instruction and call `cpu.onWatchdogReset`', () => { + loadProgram('WDR'); + cpu.onWatchdogReset = jest.fn(); + expect(cpu.onWatchdogReset).not.toHaveBeenCalled(); + avrInstruction(cpu); + expect(cpu.onWatchdogReset).toHaveBeenCalled(); + }); + it('should execute `XCH Z, r21` instruction', () => { loadProgram('XCH Z, r21'); cpu.data[r21] = 0xa1; |