sam/uVM
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Implemented base system for REV.A PCB.

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This commit is contained in:
Sam Stevens
2018-11-11 14:13:02 +00:00
parent af7037db52
commit 9de6af996c
15 changed files with 543 additions and 60 deletions
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16
arduino/VM.c
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@@ -31,6 +31,7 @@ void vm_reset(VM *vm) {
memset(vm->R, 0, sizeof(uint8_t) * VM_REG_SIZE);
vm->PC = 0;
vm->carry = 0;
vm->run = false;
vm->halted = false;
}
@@ -116,6 +117,7 @@ void vm_step(VM *vm) {
vm->error(VM_ERR_MISALIGN);
}
vm->halted = true;
vm->run = false;
return;
}
uint16_t raw = (vm->readAddr(PC, true) << 8) + vm->readAddr(PC + 1, true);
@@ -123,6 +125,7 @@ void vm_step(VM *vm) {
inst.op = (uint8_t) (raw >> 12);
if (vm->halted) {
vm->run = false;
return;
}
@@ -219,22 +222,25 @@ void vm_step(VM *vm) {
break;
case OP_JMP:
vm_decode_Q(&inst, raw);
vm->PC = vm_get_rx(vm, inst.rd);
rd = vm_get_rx(vm, inst.rd);
vm->PC = rd;
break;
case OP_JEQ:
vm_decode_S(&inst, raw);
rx = vm_get_r(vm, inst.rx);
ry = vm_get_r(vm, inst.ry);
rd = vm_get_rx(vm, inst.rd);
if (rx == ry) {
vm->PC = vm_get_rx(vm, inst.rd);
vm->PC = rd;
}
break;
case OP_JLT:
vm_decode_S(&inst, raw);
rx = vm_get_r(vm, inst.rx);
ry = vm_get_r(vm, inst.ry);
rd = vm_get_rx(vm, inst.rd);
if (rx < ry) {
vm->PC = vm_get_rx(vm, inst.rd);
vm->PC = rd;
}
break;
case OP_HLT:
@@ -248,4 +254,8 @@ void vm_step(VM *vm) {
break;
}
vm_put_r(vm, inst.rd, rd);
if (vm->halted) {
vm->run = false;
}
}