Created
November 26, 2023 10:13
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pyOCD user script for RP2040
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# pyOCD user script | |
# 'usb_boot' command will put target RP2040 into bootloader mode | |
# | |
# Howto invoke: | |
# pyocd cmd --script rp2040.py -c usb_boot | |
options.update({ | |
"target_override": "rp2040", | |
}) | |
if not "frequency" in options: | |
options.set("frequency", 10000000) | |
@command(help="Kick-start USB Bootloader") | |
def usb_boot(): | |
target.halt() | |
# Enable XOSC | |
target.write32(0x40024000, target.read32(0x40024000) & ~0x00FFF000 | 0x00FAB000) | |
ptr = target.read16(0x14) | |
usb_boot_addr = 0 | |
while True: | |
code = target.read16(ptr) | |
addr = target.read16(ptr+2) | |
ptr += 4 | |
if code == 0: | |
break | |
# print(f"code = 0x{code:04X} addr = 0x{addr:04X}") | |
if code == 0x4255: # 'UB' | |
usb_boot_addr = addr & ~1 | |
if usb_boot_addr == 0: | |
print("Error: could not find function address") | |
return | |
target.write_core_register('r0', 0) | |
target.write_core_register('r1', 0) | |
target.write_core_register('sp', 0x20041f00) | |
# target.write_core_register('pc', 0x2590) | |
target.write_core_register('pc', usb_boot_addr) | |
target.resume() |
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