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Add user sync functionality #72

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Add user sync functionality #72

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a37ffde
bvmCPU.py add UserSync
monolied Jun 28, 2024
ae90a2a
badge.py add UserSync
monolied Jun 28, 2024
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15 changes: 10 additions & 5 deletions emulator/badge.py
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Original file line number Diff line number Diff line change
Expand Up @@ -13,8 +13,10 @@ def __init__(self):
self.initMemory()
self.clock = 0b0
self.oldTime = timer()
self.oldSync = timer()
self.newTime = timer()
self.speed = 250e3 # Hz
self.usync = 1e3 # Hz
self.progMem = []
#self.pc = 0
self.acc = [
Expand Down Expand Up @@ -52,7 +54,7 @@ def __init__(self):

def initMemory(self):
self.cpu.ram[0xff] = randint(0, 16) # Set random value at SFRFF

self.cpu.ram[0xf4] = 0 # zero RdFlags

def load(self, program):
self.progmem=[]
Expand Down Expand Up @@ -91,6 +93,9 @@ def step(self):

def update(self):
self.newTime = timer()
if self.newTime > self.oldSync + 0.5/self.usync:
self.oldSync = timer()
self.cpu.ram[0xf4] |= 0b0001 # set bit 0 in SFRF4
if self.newTime > self.oldTime + 0.5/self.speed:
if self.clock == 0:
# Set random value at SFRFF
Expand All @@ -105,9 +110,9 @@ def update(self):
self.clock = 0
self.oldTime = timer()

# Check SFR1 and set clock speed accordingly
# Check SFRF1 and set clock speed accordingly
speeds = [250e3, 100e3, 30e3, 10e3, 3e3, 1e3, 500, 200, 100, 50, 20, 10, 5, 2, 1, .5]
self.speed = speeds[self.cpu.ram[0xf1]]



# Check SFRF2 and set UserSync accordingly
usyncs = [1000, 600, 400, 250, 150, 100, 60, 40, 25, 15, 10, 6, 4, 2.5, 1.5, 1]
self.usync = usyncs[self.cpu.ram[0xf2]]
3 changes: 3 additions & 0 deletions emulator/bvmCPU.py
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Expand Up @@ -281,6 +281,9 @@ def MOV(self, args):
self.ram[args['nn']] = self.ram[0]
elif args['mode'] == 5: # R0,NN
self.ram[0] = self.ram[args['nn']]
# UserSync; read clears bit 0
if self.ram[args['nn']] == 244:
self.cpu.ram[0xf4] &= 0b1110
elif args['mode'] == 6: # PC,NN
# print(f"before mov PC, {hex(args['nn'])}" )
self.ram[15] = (args['nn'] & 0xF0) >> 4
Expand Down