Touch screen driver how to implement?
Hi,
i have a custom board with a STM32 and a Touchscreen.
The TSC is connected via I2C to the STM32.
There are other I2C slave devices connected to this I2C bus, as well.
And i have two threads, a system thread and a gui thread (where Touch GFX is running in).
So when a Touch is detected, the TSC is firing an interrupt and the TSC driver is reading the TSC registers.
But when i do this TSC driver stuff in a TouchController class it is executed in the gui thread, right?
So when in the system thread are I2C accesses to other I2C slaves, too, sooner or later a collision will occur.
So the only way to deal with this as i see it is:
- ISR of TSC sets a flag bTouchEvent
- in the system thead is:
{
if (bTouchEvent)
{
Read_Out_TSC_via I2c();
}
do_other_I2C_device_stuff
}
- Driver Instance of TouchController just reads a structure where Read_Out_TSC_via I2c() stored the touch. No I2C access here.
What do you think?
