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Tools: flesh out decode-ICSR tool

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This commit is contained in:
Peter Barker 2020-10-03 11:48:57 +10:00 committed by Peter Barker
parent 6711c479de
commit 29775f310e
1 changed files with 58 additions and 7 deletions
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65
Tools/scripts/decode-ICSR.py
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@ -52,22 +52,69 @@ def decoder_m4_vectactive(value):
sys.stdout.write(" (%s)" % exception)
def decoder_m4_retobase(value):
if value:
out = "no (or no more) active exceptions"
else:
out = "preempted active exceptions"
sys.stdout.write(" (%s)" % out)
def decoder_m4_vectpending(value):
return decoder_m4_vectactive(value)
def decoder_m4_isrpending(value):
if value:
out = "Interrupt pending"
else:
out = "No pending interupt"
sys.stdout.write(" (%s)" % out)
def decoder_m4_pendstclr(value):
sys.stdout.write(" (WO clears SysTick exception)")
def decoder_m4_pendstset(value):
if value:
out = "SysTick pending"
else:
out = "SysTick not pending"
sys.stdout.write(" (%s)" % out)
def decoder_m4_pendsvclr(value):
sys.stdout.write(" (WO clears pendsv exception)")
def decoder_m4_pendsvset(value):
if value:
out = "PendSV pending"
else:
out = "PendSV not pending"
sys.stdout.write(" (%s)" % out)
def decoder_m4_nmipendset(value):
if value:
out = "NMI pending"
else:
out = "NMI not pending"
sys.stdout.write(" (%s)" % out)
# this ICSR-bit-assignment-table table also looks valid for M7 - page 195 of dm00237416-stm32f7-series-and-stm32h7-series-cortexm7-processor-programming-manual-stmicroelectronics.pdf
M4_BITS = [
("0-8", "VECTACTIVE", decoder_m4_vectactive),
("9-10", "RESERVED1", None),
("11", "RETOBASE", None),
("12-18", "VECTPENDING", None),
("11", "RETOBASE", decoder_m4_retobase),
("12-18", "VECTPENDING", decoder_m4_vectpending),
("19-21", "RESERVED2", None),
("22", "ISRPENDING", None),
("22", "ISRPENDING", decoder_m4_isrpending),
("23-24", "RESERVED3", None),
("25", "PENDSTCLR", None),
("27", "PENDSVCLR", None),
("28", "PENDSVSET", None),
("25", "PENDSTCLR", decoder_m4_pendstclr),
("26", "PENDSTSET", decoder_m4_pendstset),
("27", "PENDSVCLR", decoder_m4_pendsvclr),
("28", "PENDSVSET", decoder_m4_pendstset),
("29-30", "RESERVED4", None),
("31", "NMIPENDSET", None),
("31", "NMIPENDSET", decoder_m4_nmipendset),
]
complete_mask = 0
for bit in M4_BITS:
(bits, name, decoder) = bit
if "-" in bits:
@ -80,8 +127,12 @@ for bit in M4_BITS:
mask = 0
for i in range(start_bit, stop_bit+1):
mask |= (1 << i)
complete_mask |= mask
value = (ICSR & mask) >> start_bit
sys.stdout.write("%s: %u" % (name, value)),
if decoder is not None:
decoder(value)
print("")
if complete_mask != 0b11111111111111111111111111111111:
raise Exception("Mask incomplete")