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GT911: use 0x14 address, add interrupt handler

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This commit is contained in:
Thomas Farstrike
2026-02-09 16:39:33 +01:00
parent 1a9aefee9f
commit b0412d502a
1 changed files with 37 additions and 4 deletions
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internal_filesystem/lib/mpos/indev/gt911.py
+37 -4
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@@ -18,6 +18,12 @@ _CMD_READ_DATA = const(0x01)
_ESD_CHECK_REG = const(0x8041)
_MODULE_SWITCH_1 = const(0x804D)
_CMD_INT_RISING_EDGE = const(0x00)
_CMD_INT_FALLING_EDGE = const(0x01)
_CMD_INT_LOW_LEVEL = const(0x02)
_CMD_INT_HIGH_LEVEL = const(0x03)
_STATUS_REG = const(0x814E)
_POINT_1_REG = const(0x8150)
@@ -28,7 +34,8 @@ _VENDOR_ID_REG = const(0x814A)
_X_CORD_RES_REG = const(0x8146)
_Y_CORD_RES_REG = const(0x8148)
I2C_ADDR = 0x5D
#I2C_ADDR = 0x5D
I2C_ADDR = 0x14
BITS = 16
_ADDR2 = const(0x14)
@@ -76,12 +83,13 @@ class GT911(pointer_framework.PointerDriver):
self.__x = 0
self.__y = 0
self.__last_state = self.RELEASED
self._interrupt_flag = False
if isinstance(reset_pin, int):
reset_pin = machine.Pin(reset_pin, machine.Pin.OUT)
if isinstance(interrupt_pin, int):
interrupt_pin = machine.Pin(interrupt_pin, machine.Pin.OUT)
interrupt_pin = machine.Pin(interrupt_pin, machine.Pin.IN)
self._reset_pin = reset_pin
self._interrupt_pin = interrupt_pin
@@ -91,19 +99,24 @@ class GT911(pointer_framework.PointerDriver):
touch_cal=touch_cal, startup_rotation=startup_rotation, debug=debug
)
def _interrupt_handler(self, pin):
"""Interrupt handler called when touch event occurs"""
self._interrupt_flag = True
def hw_reset(self):
if self._interrupt_pin and self._reset_pin:
self._interrupt_pin.init(self._interrupt_pin.OUT)
self._interrupt_pin(0)
self._reset_pin(0)
time.sleep_ms(10) # NOQA
self._interrupt_pin(0)
self._interrupt_pin(1) # only for 0x14 address
#self._interrupt_pin(0)
time.sleep_ms(1) # NOQA
self._reset_pin(1)
time.sleep_ms(5) # NOQA
self._interrupt_pin(0)
time.sleep_ms(50) # NOQA
self._interrupt_pin.init(self._interrupt_pin.IN)
self._interrupt_pin.init(mode=self._interrupt_pin.IN)
time.sleep_ms(50) # NOQA
self._write_reg(_ESD_CHECK_REG, 0x00)
@@ -132,6 +145,16 @@ class GT911(pointer_framework.PointerDriver):
x, y = self.hw_size
print(f'Touch resolution: width={x}, height={y}')
# Set up interrupt handler if interrupt pin is available
if self._interrupt_pin:
self._interrupt_pin.irq(trigger=machine.Pin.IRQ_FALLING, handler=self._interrupt_handler)
# Setting _MODULE_SWITCH_1 will "hang" the touch input after a second or 2 of initial swipe
#self._write_reg(_MODULE_SWITCH_1, _CMD_INT_FALLING_EDGE) # stops working
#self._write_reg(_MODULE_SWITCH_1, _CMD_INT_RISING_EDGE) # stops working
# Unknown IRQ_LOW_LEVEL:
#self._interrupt_pin.irq(trigger=machine.Pin.IRQ_LOW_LEVEL, handler=self._interrupt_handler)
#self._write_reg(_MODULE_SWITCH_1, _CMD_INT_LOW_LEVEL)
@property
def hw_size(self):
self._read_reg(_X_CORD_RES_REG, 2)
@@ -153,6 +176,16 @@ class GT911(pointer_framework.PointerDriver):
return gt911_extension.GT911Extension(self, self._device)
def _get_coords(self):
# If interrupt pin is available, only fetch data when interrupt flag is set
if self._interrupt_pin and not self._interrupt_flag:
return self.__last_state, self.__x, self.__y
# Clear interrupt flag before reading
if self._interrupt_pin:
self._interrupt_flag = False
#self._write_reg(_MODULE_SWITCH_1, _CMD_INT_FALLING_EDGE)
#print("[GT911] Interrupt-triggered read")
self._read_reg(_STATUS_REG, 1)
touch_cnt = self._rx_buf[0] & 0x0F
status = self._rx_buf[0] & 0x80