uint8_t at42qt1060_get_detect_status(void)
{
uint8_t status;
/* We need to read both status registers to reset the CHG line */
status = at42qt1060_read_reg(AT42QT1060_DETECTION_STATUS);
at42qt1060_read_reg(AT42QT1060_INPUT_PORT_STATUS);
return status;
}
void controller_task(void)
{
// if a touch is detected we read the status
if (touch_detect) {
touch_data.detect_status =
at42qt1060_read_reg(AT42QT1060_DETECTION_STATUS);
// need to read input port status too to reset CHG line
at42qt1060_read_reg(AT42QT1060_INPUT_PORT_STATUS);
touch_detect = false;
}
}
void at42qt1060_init(int32_t fcpu)
{
volatile uint8_t tmp1, tmp2, tmp3;
/* Store cpu frequency locally*/
cpu_hz = fcpu;
/* set I/O pins as outputs in order to not let them float
* This will trigger a change on the detect line although not
* documented in datasheet
*/
at42qt1060_write_reg(AT42QT1060_IO_MASK, 0xFF);
/* Set keys that will trigger a change on the detect line
*/
at42qt1060_write_reg(AT42QT1060_KEY_MASK, AT42QT1060_KEY_MASK_VALUE);
at42qt1060_write_reg(AT42QT1060_DI, AT42QT1060_DETECT_INTEGRATOR_VALUE);
// Set detect thresholds
at42qt1060_write_reg(AT42QT1060_KEY_0_NTHR,
AT42QT1060_KEY_0_NTHR_VALUE);
at42qt1060_write_reg(AT42QT1060_KEY_1_NTHR,
AT42QT1060_KEY_1_NTHR_VALUE);
at42qt1060_write_reg(AT42QT1060_KEY_2_NTHR,
AT42QT1060_KEY_2_NTHR_VALUE);
at42qt1060_write_reg(AT42QT1060_KEY_3_NTHR,
AT42QT1060_KEY_3_NTHR_VALUE);
at42qt1060_write_reg(AT42QT1060_KEY_4_NTHR,
AT42QT1060_KEY_4_NTHR_VALUE);
at42qt1060_write_reg(AT42QT1060_KEY_5_NTHR,
AT42QT1060_KEY_5_NTHR_VALUE);
tmp1 = at42qt1060_read_reg(AT42QT1060_IO_MASK);
tmp2 = at42qt1060_read_reg(AT42QT1060_KEY_MASK);
tmp3 = at42qt1060_read_reg(AT42QT1060_LP_MODE);
/* Read out touch status to reset detect line */
tmp1 = at42qt1060_get_detect_status();
}
static void twi_init(U32 fpba_hz)
{
const gpio_map_t AT42QT1060_TWI_GPIO_MAP =
{
{AT42QT1060_TWI_SCL_PIN, AT42QT1060_TWI_SCL_FUNCTION},
{AT42QT1060_TWI_SDA_PIN, AT42QT1060_TWI_SDA_FUNCTION}
};
const twi_options_t AT42QT1060_TWI_OPTIONS =
{
.pba_hz = 24000000,
.speed = AT42QT1060_TWI_MASTER_SPEED,
.chip = AT42QT1060_TWI_ADDRESS
};
// Assign I/Os to SPI.
gpio_enable_module(AT42QT1060_TWI_GPIO_MAP,
sizeof(AT42QT1060_TWI_GPIO_MAP) / sizeof(AT42QT1060_TWI_GPIO_MAP[0]));
// Initialize as master.
twi_master_init(AT42QT1060_TWI, &AT42QT1060_TWI_OPTIONS);
}
/*! \brief Callback function for a detect event of the touch sensor device.
*/
void touch_detect_callback(void)
{
touch_detect = true;
}
struct at42qt1060_data touch_data;
void controller_task(void)
{
// if a touch is detected we read the status
if(touch_detect)
{
touch_data.detect_status =
at42qt1060_read_reg(AT42QT1060_DETECTION_STATUS);
// need to read input port status too to reset CHG line
at42qt1060_read_reg(AT42QT1060_INPUT_PORT_STATUS);
touch_detect = false;
}
}
static void controller_detect_int_handler(void)
{
if(gpio_get_pin_interrupt_flag(AT42QT1060_DETECT_PIN))
{
gpio_clear_pin_interrupt_flag(AT42QT1060_DETECT_PIN);
touch_detect_callback();
}
}
void controller_init(U32 fcpu_hz, U32 fhsb_hz, U32 fpbb_hz, U32 fpba_hz)
{
// Disable all interrupts
Disable_global_interrupt();
twi_init(fpba_hz);
// wait until the device settles its CHG line
cpu_delay_ms(230, fcpu_hz);
at42qt1060_init(fcpu_hz);
BSP_INTC_IntReg(&controller_detect_int_handler, AVR32_GPIO_IRQ_0 + AT42QT1060_DETECT_PIN/8, AVR32_INTC_INT1);
// For now we only react on falling edge
// Actually this is a level interrupt (low active)
gpio_enable_pin_interrupt(AT42QT1060_DETECT_PIN, GPIO_FALLING_EDGE);
gpio_clear_pin_interrupt_flag(AT42QT1060_DETECT_PIN);
//static_fcpu_hz = fcpu_hz;
cpu_set_timeout(cpu_ms_2_cy(JOYSTICK_KEY_DEBOUNCE_MS, static_fcpu_hz),
&joystick_key_sensibility_timer);
// Enable global interrupts
Enable_global_interrupt();
}
