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Lee Lup Yuen 2023-01-03 16:13:06 +08:00
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@ -5046,13 +5046,57 @@ static void touch_panel_read(struct i2c_master_s *i2c)
}
```
TODO
To detect Touch Events, we'll need to handle the Interrupts triggered by Touch Panel.
Based on our research, PinePhone's Touch Panel Interrupt (CTP-INT) is connected at PH4.
Let's monitor the interrupts triggered at PH4: [pinephone_bringup.c](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/9ab90bc67a25b8c33e24f62662343950831e7e56/boards/arm64/a64/pinephone/src/pinephone_bringup.c#L102-L166)
Right now we poll PH4 (instead of handling interrupts) because it's easier: [pinephone_bringup.c](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/c4991b1503387d57821d94a549425bcd8f268841/boards/arm64/a64/pinephone/src/pinephone_bringup.c#L256-L296)
```c
// Test Touch Panel Interrupt by Polling as GPIO Input.
// Touch Panel Interrupt (CTP-INT) is at PH4.
// Configure for GPIO Input
#define CTP_INT (PIO_INPUT | PIO_PORT_PIOH | PIO_PIN4)
static void touch_panel_read(struct i2c_master_s *i2c);
// Poll for Touch Panel Interrupt (PH4) by reading as GPIO Input
void touch_panel_initialize(struct i2c_master_s *i2c)
{
// Configure the Touch Panel Interrupt for GPIO Input
int ret = a64_pio_config(CTP_INT);
DEBUGASSERT(ret == 0);
// Poll the Touch Panel Interrupt as GPIO Input
bool prev_val = false;
for (int i = 0; i < 500; i++) { // Poll for 5 seconds
// Read the GPIO Input
bool val = a64_pio_read(CTP_INT);
// If value has changed...
if (val != prev_val) {
// Print the value
if (val) { up_putc('+'); }
else { up_putc('-'); }
prev_val = val;
// If value is High...
if (val) {
// Read the Touch Panel over I2C
touch_panel_read(i2c);
}
}
// Wait a while
up_mdelay(10);
}
}
```
Eventually we'll use an Interrupt Handler to monitor PH4: [pinephone_bringup.c](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/9ab90bc67a25b8c33e24f62662343950831e7e56/boards/arm64/a64/pinephone/src/pinephone_bringup.c#L102-L166)
```c
// Touch Panel Interrupt (CTP-INT) is at PH4
@ -5119,8 +5163,6 @@ Which means that the Touch Input Interrupt is generated continuously. Without to
Is our code correct?
Let's verify by reading PH4 as GPIO Input, repeatedly in a loop.
TODO
# Test Logs