/** @brief Function for initializing the GPIO Tasks/Events peripheral.
*/
static void gpiote_init(void)
{
// Connect GPIO input buffers and configure PWM_OUTPUT_PIN_NUMBER as an output.
nrf_gpio_range_cfg_input(BUTTON_START, BUTTON_STOP, BUTTON_PULL);
nrf_gpio_cfg_output(PWM_OUTPUT_PIN_NUMBER);
nrf_gpio_port_clear(NRF_GPIO_PORT_SELECT_PORT0, 0xFF);
// Configure GPIOTE channel 0 to toggle the PWM pin state
// @note Only one GPIOTE task can be connected to an output pin.
nrf_gpiote_task_config(0, PWM_OUTPUT_PIN_NUMBER, \
NRF_GPIOTE_POLARITY_TOGGLE, NRF_GPIOTE_INITIAL_VALUE_LOW);
}
/**
* main function
* \return 0. int return type required by ANSI/ISO standard.
*/
int main(void)
{
int i;
gpio_init();
gpiote_init();
wdt_init();
//Write the value of RESETREAS to pins 9-15 (LEDs 1-7)
nrf_gpio_pin_write(LED_1, NRF_POWER->RESETREAS & POWER_RESETREAS_RESETPIN_Msk); //Bit A in RESETREAS
nrf_gpio_pin_write(LED_2, NRF_POWER->RESETREAS & POWER_RESETREAS_DOG_Msk); //Bit B in RESETREAS
nrf_gpio_pin_write(LED_3, NRF_POWER->RESETREAS & POWER_RESETREAS_SREQ_Msk); //Bit C in RESETREAS
nrf_gpio_pin_write(LED_4, NRF_POWER->RESETREAS & POWER_RESETREAS_LOCKUP_Msk); //Bit D in RESETREAS
nrf_gpio_pin_write(LED_5, NRF_POWER->RESETREAS & POWER_RESETREAS_OFF_Msk); //Bit E in RESETREAS
nrf_gpio_pin_write(LED_6, NRF_POWER->RESETREAS & POWER_RESETREAS_LPCOMP_Msk); //Bit F in RESETREAS
nrf_gpio_pin_write(LED_7, NRF_POWER->RESETREAS & POWER_RESETREAS_DIF_Msk); //Bit G in RESETREAS
NRF_POWER->RESETREAS = 0xFFFFFFFF; //Clear the RESETREAS register
for(i=0;i<STARTUP_TOGGLE_ITERATIONS;i++)
{
nrf_gpio_pin_toggle(LED_0);
nrf_delay_us(DELAY);
}
while (true)
{
//Blink LED 0 fast until watchdog triggers reset
nrf_gpio_pin_toggle(LED_0);
nrf_delay_us(DELAY/3);
// If SYSTEM_OFF_BUTTON is pressed.. enter System Off mode
if(nrf_gpio_pin_read(SYSTEM_OFF_BUTTON) == BTN_PRESSED)
{
// Clear PORT 1 (pins 8-15)
nrf_gpio_port_clear(NRF_GPIO_PORT_SELECT_PORT1, 0xFF);
// Enter system OFF. After wakeup the chip will be reset, and the program will run from the top
NRF_POWER->SYSTEMOFF = 1;
}
// If SOFTWARE_RESET_BUTTON is pressed.. soft-reset
if(nrf_gpio_pin_read(SOFTWARE_RESET_BUTTON) == BTN_PRESSED)
{
NVIC_SystemReset();
}
}
}
/**
* @brief Function for application main entry.
*/
int main(void)
{
// Configure pins 8-15 (Port1) as outputs
nrf_gpio_range_cfg_output(8, 15);
nrf_gpio_port_clear(NRF_GPIO_PORT_SELECT_PORT1, 0XFF);
// Configure motion interrupt pin
nrf_gpio_cfg_input(MOTION_INTERRUPT_PIN_NUMBER, NRF_GPIO_PIN_PULLDOWN);
gpiote_init();
if (adns2080_init() != ADNS2080_OK)
{
// ADNS2080 init failed, set rightmost LED on.
nrf_gpio_pin_write(15, 1);
while (true)
{
// Do nothing.
}
}
// By default, ADNS2080 motion interrupt output is active low, edge sensitive; make it active high.
if (adns2080_motion_interrupt_set(ADNS2080_MOTION_OUTPUT_POLARITY_HIGH, ADNS2080_MOTION_OUTPUT_SENSITIVITY_LEVEL) != ADNS2080_OK)
{
nrf_gpio_pin_write(14, 1);
while (true)
{
// Do nothing.
}
}
// Read out movement to clear ADNS2080 interrupt flags.
if (adns2080_is_motion_detected())
{
int16_t dummy;
adns2080_movement_read(&dummy, &dummy);
}
// Enable GPIOTE interrupt in Nested Vector Interrupt Controller.
NVIC_EnableIRQ(GPIOTE_IRQn);
// Enable global interrupts.
__enable_irq();
while(true)
{
if (motion_interrupt_detected)
{
// Toggle pin 12 to indicate that we've detected motion interrupt.
nrf_gpio_pin_toggle(12);
motion_interrupt_detected = false;
// On our Nordic reference design PCB, the chip orientation is not the same as in the ADNS2080
// datasheet diagram, so X and Y axis are reversed. This is corrected by passing the pointer
// parameters in reversed order. */
adns2080_movement_read(&m_delta_y, &m_delta_x);
// If movement delta_x is above the threshold, the LEDs light up accordingly. When the mouse is moved
// to the left, LEDs 1 through 4 are lit and when the mouse is moved right, LEDs 5 through 8 are lit.
if (m_delta_x > MOUSE_MOVEMENT_THRESHOLD)
{
nrf_gpio_port_write(NRF_GPIO_PORT_SELECT_PORT1, 0xF0);
}
else if (m_delta_x < (-MOUSE_MOVEMENT_THRESHOLD))
{
nrf_gpio_port_write(NRF_GPIO_PORT_SELECT_PORT1, 0x0F);
}
else
{
nrf_gpio_port_clear(NRF_GPIO_PORT_SELECT_PORT1, 0xFF);
}
}
}
}
