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Add support to CST816 chips with different register for chip ID #2

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Merged
merged 1 commit into from
Mar 31, 2025
Merged

Add support to CST816 chips with different register for chip ID #2

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21 changes: 14 additions & 7 deletions adafruit_cst8xx.py
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Original file line number Diff line number Diff line change
Expand Up @@ -48,6 +48,7 @@
_CST_REG_TOUCHDATA = const(0x03)
_CST_REG_SLEEP = const(0xA5)
_CST_REG_FIRMVERS = const(0xA6)
_CST_REG_CHIPID_816 = const(0xA7)
_CST_REG_MODID = const(0xA8)
_CST_REG_PROJID = const(0xA9)
_CST_REG_CHIPTYPE = const(0xAA)
Expand Down Expand Up @@ -77,14 +78,20 @@ def __init__(self, i2c, address=_CST_DEFAULT_I2C_ADDR, debug=False, irq_pin=None

chip_data = self._read(_CST_REG_FIRMVERS, 6) # don't wait for IRQ
# print("chip_data: {%x}".format(chip_data))
fw_version, _, _, chip_type = struct.unpack("<HBBH", chip_data)
print("fw_version: {:02X}, chip_type: {:02X}".format(fw_version, chip_type))

if chip_type not in (_CHIP_ID_CST826,):
raise RuntimeError("Did not find CST8XX chip")

if debug:
print("Firmware vers %04X" % int(fw_version))
fw_version, _, _, chip_type = struct.unpack("<HBBH", chip_data)
print("fw_version: {:02X}, chip_type: {:02X}".format(fw_version, chip_type))

if chip_data[1] in (_CHIP_ID_CST816S, _CHIP_ID_CST816T, _CHIP_ID_CST816D):
# this is a CST816x
if debug:
print("CST816 chip found")
elif chip_data[5] in (_CHIP_ID_CST826,):
# this is a CST826
if debug:
print("CST826 chip found")
else:
raise RuntimeError("Did not find supported CST8XX chip")

@property
def touched(self) -> int:
Expand Down