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fix(core): wakeup touch controller from monitor mode

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This commit is contained in:
cepetr 2025-02-05 15:47:16 +01:00 committed by cepetr
parent 061e71213e
commit e23074f9d3
1 changed files with 24 additions and 0 deletions
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24
core/embed/io/touch/ft6x36/ft6x36.c
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@ -129,6 +129,25 @@ static secbool ft6x36_write_reg(i2c_bus_t* bus, uint8_t reg, uint8_t value) {
return sectrue; return sectrue;
} }
// Wake up the touch controller from monitor mode.
//
// The FT3168 touch controller switches from active mode to monitor mode
// after a period of inactivity (the default setting is ~12s).
// This feature cannot be disabled (at least in the current controller
// firmware). When in this mode, it fails to respond to the first I2C command —
// writes are not ACKed, and reads return 0x00 or garbage data.
// To avoid this issue, we need to wake up the controller before
// sending any commands to it.
static void ft6x36_wake_up(i2c_bus_t* bus) {
uint8_t temp;
// Wake up the touch controller by reading one of its registers
// (the specific register does not matter)
ft6x36_read_regs(bus, 0x00, &temp, 1);
// Wait for the touch controller to wake up
// (not sure if this is necessary, but it's safer to include it)
systick_delay_ms(1);
}
// Powers down the touch controller and puts all // Powers down the touch controller and puts all
// the pins in the proper state to save power. // the pins in the proper state to save power.
static void ft6x36_power_down(void) { static void ft6x36_power_down(void) {
@ -288,6 +307,8 @@ secbool touch_init(void) {
goto cleanup; goto cleanup;
} }
ft6x36_wake_up(driver->i2c_bus);
// Configure the touch controller // Configure the touch controller
if (sectrue != ft6x36_configure(driver->i2c_bus)) { if (sectrue != ft6x36_configure(driver->i2c_bus)) {
goto cleanup; goto cleanup;
@ -344,6 +365,7 @@ secbool touch_set_sensitivity(uint8_t value) {
touch_driver_t* driver = &g_touch_driver; touch_driver_t* driver = &g_touch_driver;
if (sectrue == driver->initialized) { if (sectrue == driver->initialized) {
ft6x36_wake_up(driver->i2c_bus);
return ft6x36_write_reg(driver->i2c_bus, FT6X36_REG_TH_GROUP, value); return ft6x36_write_reg(driver->i2c_bus, FT6X36_REG_TH_GROUP, value);
} else { } else {
return secfalse; return secfalse;
@ -365,6 +387,8 @@ uint8_t touch_get_version(void) {
hal_delay(1); hal_delay(1);
} }
ft6x36_wake_up(driver->i2c_bus);
uint8_t fw_version = 0; uint8_t fw_version = 0;
if (sectrue != if (sectrue !=