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[WIP] Unset the flash chip's WP pin on erase #4

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[WIP] Unset the flash chip's WP pin on erase #4

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4 changes: 4 additions & 0 deletions rtdmultiprog.py
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Original file line number Diff line number Diff line change
Expand Up @@ -135,14 +135,17 @@ def get_flash_id():

def erase_flash():
print("Erasing... ", end='')
write_reg(0xe3, read_reg(0xe3)[0] | (1<<2)) # deassert WP pin
isp_custom_instruction(CI_WRITE_AFTER_WREN, WRSR, 0, 1, 0x00) # Unprotect the flash
isp_custom_instruction(CI_ERASE, ERAS, 0, 0, 0x00) # Erase the flash
isp_custom_instruction(CI_WRITE_AFTER_WREN, WRSR, 0, 1, 0x1C) # Protect the flash
write_reg(0xe3, read_reg(0xe3)[0] & ~(1<<2)) # assert WP pin
print("done")

def program_flash(data, progress_callback=lambda s, e, c: None):
print(f"Will write {len(data) / 1024:.1f} KiB")

write_reg(0xe3, read_reg(0xe3)[0] | (1<<2)) # deassert WP pin
isp_custom_instruction(CI_WRITE_AFTER_WREN, WRSR, 0, 1, 0x00) # Unprotect the flash
pages = list(div_to_chunks(data, PAGE_SIZE))
for page_n, page in enumerate(pages):
Expand All @@ -165,6 +168,7 @@ def program_flash(data, progress_callback=lambda s, e, c: None):

poll(lambda: not read_reg (0x6F)[0] & 0x40, "Programming done timeout")
isp_custom_instruction(CI_WRITE_AFTER_WREN, WRSR, 0, 1, 0x1C) # Protect the flash
write_reg(0xe3, read_reg(0xe3)[0] & ~(1<<2)) # assert WP pin

data_crc = calculate_crc(data)
chip_crc = isp_get_crc(0, len(data) - 1)
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