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## This file writes the in inst.py defined instruction to the AT28C EEPROM
## conntected to a raspberry pi via GPIO pins
import inst
import eeprom_pi as ep
## for cmd line args access
import sys
## given an address and an instruction this writes corredsponding bytes to the
## EEPROM
def write_micro_inst_out(address, instruction):
ctl_word_half = 0x00
if eeprom_n == 1:
ctl_word_half = instruction & 0xff
elif eeprom_n == 2:
ctl_word_half = (instruction >> 8) & 0xff
print("%s: %s (%s)" % (hex(address), hex(ctl_word_half),
hex(instruction)))
ep.write_data_at(address, ctl_word_half)
## look for cmd line parameter to known which EEPROM we write to currently
if(len(sys.argv) != 2):
print("usage: %s <number eeprom>" % sys.argv[0])
print("please specify the eeprom you want to write to.")
exit()
eeprom_n = int(sys.argv[1])
if not (eeprom_n == 1 or eeprom_n == 2):
print("error: only two eeproms supported right now")
exit()
print("writing eeprom %s" % eeprom_n)
## setup board
ep.init_board()
## for every instruction
nr_inst = 1
for instruction_data in inst.INST:
print("writing instruction %s" % nr_inst)
base_address = instruction_data[0]
mops = instruction_data[1]
n = 0
# write fetch instruction micro ops for every instruction
for fi_mop in inst.INST_MICRO_OP_FETCH_INSTRUCTION:
write_micro_inst_out(base_address+n, fi_mop)
n += 1
print("------------")
for mop in mops:
write_micro_inst_out(base_address+n, mop)
n += 1
## insert 0x00 for not used micro instuctions, so all control signals 0
## and the pc is not doing some unwanted stuff
while n < inst.MAX_MICRO_OPS:
write_micro_inst_out(base_address+n, 0x0000)
n += 1
nr_inst += 1
## write a fetch instruction at address 0x0, so that after a reset we are
## fetching the first instruction
print("\n")
print("writing inst fetch instruction at address 0x0, so we begin executing"
"after reset:")
n = 0
base_address = 0x0
for fi_mop in inst.INST_MICRO_OP_FETCH_INSTRUCTION:
write_micro_inst_out(base_address+n, fi_mop)
n += 1
## write NULLs
while n < inst.MAX_MICRO_OPS:
write_micro_inst_out(base_address+n, 0x0000)
n += 1
## write HLT instruction aka, everything 0x00, no new instruction fetch cycle
n = 0
base_address = inst.INST_HLT
while n < inst.MAX_MICRO_OPS:
write_micro_inst_out(base_address+n, 0x0000)
n += 1
trash = raw_input("please unplug the power to the EEPORM now and press any key to continue...")
ep.cleanup()
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