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触控设备手势唤醒的设计思路及其实现

作者:时间:2012-07-14来源:网络收藏
示例代码3

本文引用地址:http://www.amcfsurvey.com/article/160306.htm

  // this handles hardware-level interrupts on the micro

  __interrupt void irq_handler( void )

  {

  ...

  // if the hardware interrupt came from the MAX44000 sensor

  // pulling its INT pin low

  if ( irq_source == MAX44000 )

  {

  // if the device is in sleep mode

  if (device_status == SLEEP_MODE)

  {

  device_status = WAKE_MODE; // wake up the device

  ...

  // reconfigure whatever else you need here as the system wakes up

  }

  // otherwise, handle it however it is you wish

  else

  {

  ...

  }

  }

  ...

  }

  /**

  * configure_max44000_for_sleep_mode()

  *

  * Sets up the MAX44000 to trigger a hardware interrupt when the proximity

  * counts go above some set threshold.

  *

  * Arguments:

  * uint8 upper_threshold - the set threshold (8-bit mode)

  *

  * Returns:

  * n/a

  */

  void configure_max44000_for_sleep_mode(uint8 upper_threshold)

  {

  uint8 max44000_thresh_registers[] = {0x0B,0x0C};

  uint8 max44000_upper_thresh[] = {0x40,0};

  max44000_upper_thresh[1] = upper_threshold;

  // do a consecutive write of 0 followed by upper_threshold to

  // registers 0xB and 0xC, respectively

  // MAX44000_ADDR is usually 0x94

  // interrupt will trigger only if proximity value is above the threshold

  write_i2c_register(MAX44000_ADDR,max44000_thresh_registers,

  max44000_upper_thresh,2);

  // write to bits 2 and 3 of register 0x0A here if you wish to set the

  // persist time to anything other than one sample

  // writes to register 0x01 to enable interrupts on the MAX44000

  max44000_enable_interrupt();

  return;

  }


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