Adding Bus Pirate/..-style debugging & probing features to regular MCU boards such as the Raspberry Pi Pico
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#!/usr/bin/env python3
import argparse, serial, struct
from typing import *
def auto_int(x):
return int(x, 0)
class RTOpt(NamedTuple):
type: bool
optid: int
desc: str
supportmap = {
2: "UART",
4: "I2C-Tiny-USB",
8: "Temperature sensor",
0x80: "stdio USB-CDC debug interface"
option_table = {
'ctsrts': RTOpt(bool, 1, "Enable or disable CTS/RTS flow control (--ctsrts [true|false])"),
'i2ctemp': RTOpt(auto_int, 2, "Control the builtin I2C temperature controller: get (0), disable (-1/0xff) or set/enable (other) the current status and I2C bus address"),
'support': RTOpt(str, 0xff, "Get list of supported/implemented functionality"),
S_ACK = b'\x06'
S_NAK = b'\x15'
S_CMD_NOP = b'\x00'
S_CMD_Q_IFACE = b'\x01'
S_CMD_Q_CMDMAP = b'\x02'
S_CMD_Q_PGMNAME = b'\x03'
S_CMD_SYNCNOP = b'\x10'
def val2byte(t, v) -> int:
if t == bool:
return 1 if v else 0
if t == int or t == auto_int:
return 0xff if v < 0 else (v & 0xff)
if t == str:
return 0
assert False, "unimplemented type %s" % str(t)
def do_xfer(args, cmd:int, arg:int, port: str, baudrate:int=115200) -> Optional[int]:
with serial.Serial(port, baudrate, timeout=1) as ser:
cmdmap = [0]*32
syncok = False
for i in range(8):
a =
b =
if a == S_NAK and b == S_ACK:
syncok = True
if not syncok:
print("sync failed")
return None
if != S_ACK:
print("nop failed")
return None
if != S_ACK:
print("q_iface failed")
return None
serprogver = struct.unpack('<H',[0]
if serprogver != 1:
print("unknown serprog protocol version %d" % serprogver)
return None
if != S_ACK:
print("q_cmdmap failed")
return None
cmdmap =
if (cmdmap[S_CMD_MAGIC_SETTINGS[0] >> 3] & (1<<(S_CMD_MAGIC_SETTINGS[0]&7))) == 0:
print("serprog programmer has no S_CMD_MAGIC_SETTINGS")
return None
if (cmdmap[S_CMD_Q_PGMNAME[0] >> 3] & (1<<(S_CMD_Q_PGMNAME[0]&7))) != 0:
if != S_ACK:
print("q_pgmname failed")
name ='utf-8')
if args.verbose: print("programmer is '%s'" % name)
acknak =
if acknak == S_ACK:
print("settings command failed")
return None
def main():
parser = argparse.ArgumentParser(prog="dmctl",
description="Runtime configuration control for DapperMime-JTAG")
parser.add_argument('tty', type=str, nargs=1, #'?', #default="/dev/ttyACM1",
help="Path to DapperMime-JTAG Serprog UART device"#+\
#" [/dev/ttyACM1]"
parser.add_argument('-v', '--verbose', default=False, action='store_true',
help="Verbose logging (for this utility)")
for k, v in option_table.items():
if k == "support":
parser.add_argument('--%s'%k, default=None, action='store_true',
parser.add_argument('--%s'%k, type=v.type, nargs='?', default=None,
args = parser.parse_args()
for k, v in option_table.items():
if args.__dict__[k] is not None:
resp = do_xfer(args, v.optid, val2byte(v.type, args.__dict__[k]), args.tty[0])
if resp is None:
return 1
if k == "support":
print(", ".join(kvp[1] for kvp in supportmap.items() if (kvp[0] & resp) != 0))
#if args.verbose:
print("-> %d" % resp)
return 0
#do_xfer(1, 1, "/dev/ttyACM1")
#do_xfer(1, 0, "/dev/ttyACM1")
#if __name__ == '__main__':
# main()
with serial.Serial('/dev/ttyACM2', 115200, timeout=1) as ser:
regs = [x+0x18 for x in range(8)]
ops = [0x1889] # adds r1, r2
olen = len(ops)
ser.write(struct.pack('<IIIIIIII', *regs))
ser.write(struct.pack('<I', olen))
ser.write(struct.pack('<'+('H'*olen), *ops))