AMiRo-OS

#include "helper.h"

#include "blt_conf.h"

/*

 * Initialized the system timer.

 */

void saTimerInit(void) {

  /* reset the timer configuration */

  saTimerReset();

  /* configure the systick frequency as a 1 ms event generator */

  SysTick->LOAD = BOOT_CPU_SYSTEM_SPEED_KHZ - 1;

  /* reset the current counter value */

  SysTick->VAL = 0;

  /* select core clock as source and enable the timer */

  SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk | SysTick_CTRL_ENABLE_Msk;

}

/*

 * Resets the systick status of the system timer.

 */

void saTimerReset(void) {

  /* set the systick's status and control register back into the default reset value */

  SysTick->CTRL = 0;

}

/*

 * Updates the given timer variable.

 * More specifically, the given variable in incremented if a millisecond event occurred.

 */

void saTimerUpdate(uint32_t* millisecond_counter) {

  /* check if the millisecond event occurred */

  if ((SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk) != 0)

  {

    /* increment the millisecond counter */

    ++(*millisecond_counter);

  }

  return;

}

/*

 * Actively polls the standalone timer until the specified time has passed.

 */

void msleep(uint32_t ms)

{

  uint32_t current;

  saTimerUpdate(&current);

  uint32_t end = current + ms;

  while (current < end)

  {

    saTimerUpdate(&current);

  }

  return;

}

/*

 * Actively reads the specified GPIO until it has the specified state.

 */

void waitForSignal(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin, BitAction state) {

  /* check whether the signal has been set */

  while (GPIO_ReadInputDataBit(GPIOx, GPIO_Pin) != state) {

    continue;

  }

  return;

}

/*

 * Actively reads the specified GPIO until it has the specified state, or the specified time has passed.

 */

uint8_t waitForSignalTimeout(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin, BitAction state, uint32_t timeout_ms) {

  uint32_t current_time;

  saTimerUpdate(&current_time);

  uint32_t timeout_time = current_time + timeout_ms;

  while ((GPIO_ReadInputDataBit(GPIOx, GPIO_Pin) != state) &&

         (current_time < timeout_time)) {

    saTimerUpdate(&current_time);

  }

  if (current_time < timeout_time) {

    return 1;

  } else {

    return 0;

  }

}

/*

 * Turns the board LED or or off respectively.

 * If the argument is zero, the LED is switched off.

 * If the argument is not zero, the LED is switched on.

 */

void setLed(uint8_t on) {

#if defined(LED_GPIO) && defined(LED_PIN)

  if (on == 0) {

    GPIO_SetBits(LED_GPIO, LED_PIN);

  } else {

    GPIO_ResetBits(LED_GPIO, LED_PIN);

  }

#endif

  return;

}

/*

 * Makes the LED blink 'SOS' in morese code (... --- ...).

 * If the specified number of loops is zero, the function will loop infinitely.

 */

void blinkSOS(uint32_t loops) {

  /* initialize some variables and constants */

  enum State {BLINK_ERROR_S1,

              BLINK_ERROR_O,

              BLINK_ERROR_S2,

              BLINK_ERROR_BREAK

             } state = BLINK_ERROR_S1;

  uint8_t led = 0;

  uint32_t loop = 0;

  const uint32_t sigS = 50;

  const uint32_t sigL = 200;

  const uint32_t sigB = 100;

  const uint32_t letterBreakTime = 200;

  const uint32_t wordBreakTime = 1000;

  uint32_t stateStartTime = 0;

  saTimerUpdate(&stateStartTime);

  uint32_t currentTime = stateStartTime;

  /* either loop the specified number, or infinitely */

  while (loop < loops || loops == 0) {

    /* make the LED blink "SOS" (morse code: ... --- ...)*/

    led = 0;

    saTimerUpdate(&currentTime);

    switch (state) {

      case BLINK_ERROR_S1:

      case BLINK_ERROR_S2:

      {

        if (currentTime < stateStartTime + sigS) {

          led = 1;

        } else if (currentTime < stateStartTime + sigS+sigB) {

          led = 0;

        } else if (currentTime < stateStartTime + sigS+sigB+sigS) {

          led = 1;

        } else if (currentTime < stateStartTime + sigS+sigB+sigS+sigB) {

          led = 0;

        } else if (currentTime < stateStartTime + sigS+sigB+sigS+sigB+sigS) {

          led = 1;

        } else if (currentTime < stateStartTime + sigS+sigB+sigS+sigB+sigS+letterBreakTime) {

          led = 0;

        } else {

          if (state == BLINK_ERROR_S1) {

            state = BLINK_ERROR_O;

          } else {

            state = BLINK_ERROR_BREAK;

            ++loop;

          }

          stateStartTime = currentTime;

        }

        break;

      }

      case BLINK_ERROR_O:

      {

        if (currentTime < stateStartTime + sigL) {

          led = 1;

        } else if (currentTime < stateStartTime + sigL+sigB) {

          led = 0;

        } else if (currentTime < stateStartTime + sigL+sigB+sigL) {

          led = 1;

        } else if (currentTime < stateStartTime + sigL+sigB+sigL+sigB) {

          led = 0;

        } else if (currentTime < stateStartTime + sigL+sigB+sigL+sigB+sigL) {

          led = 1;

        } else if (currentTime < stateStartTime + sigL+sigB+sigL+sigB+sigL+letterBreakTime) {

          led = 0;

        } else {

          state = BLINK_ERROR_S2;

          stateStartTime = currentTime;

        }

        break;

      }

      case BLINK_ERROR_BREAK:

      {

        if (currentTime >= stateStartTime + wordBreakTime) {

          state = BLINK_ERROR_S1;

          stateStartTime = currentTime;

        }

        break;

      }

    }

    setLed(led);

  }

  return;

}

/*

 * Shortcut to make the LED blink SOS infinitely.

 */

inline void blinkSOSinf() {

  blinkSOS(0);

  return;

}

/*

 * Makes the LED blink 'OK' in morese code (... -.-).

 * If the specified number of loops is zero, the function will loop infinitely.

 */

void blinkOK(uint32_t loops) {

  /* initialize some variables and constants */

  enum State {BLINK_SUCCESS_O,

              BLINK_SUCCESS_K,

             BLINK_SUCCESS_BREAK

             } state = BLINK_SUCCESS_O;

  uint8_t led = 0;

  uint32_t loop = 0;

  const uint32_t sigS = 50;

  const uint32_t sigL = 200;

  const uint32_t sigB = 100;

  const uint32_t letterBreakTime = 200;

  const uint32_t wordBreakTime = 1000;

  uint32_t stateStartTime = 0;

  saTimerUpdate(&stateStartTime);

  uint32_t currentTime = stateStartTime;

  /* either loop the specified number, or infinitely */

  while (loop < loops || loops == 0)

  {

    /* make the LED blink "OK" (morse code: --- -.-)*/

    led = 0;

    saTimerUpdate(&currentTime);

    switch (state) {

      case BLINK_SUCCESS_O:

      {

        if (currentTime < stateStartTime + sigL) {

          led = 1;

        } else if (currentTime < stateStartTime + sigL+sigB) {

          led = 0;

        } else if (currentTime < stateStartTime + sigL+sigB+sigL) {

          led = 1;

        } else if (currentTime < stateStartTime + sigL+sigB+sigL+sigB) {

          led = 0;

        } else if (currentTime < stateStartTime + sigL+sigB+sigL+sigB+sigL) {

          led = 1;

        } else if (currentTime < stateStartTime + sigL+sigB+sigL+sigB+sigL+letterBreakTime) {

          led = 0;

        } else {

          state = BLINK_SUCCESS_K;

          stateStartTime = currentTime;

        }

        break;

      }

      case BLINK_SUCCESS_K:

      {

        if (currentTime < stateStartTime + sigL) {

          led = 1;

        } else if (currentTime < stateStartTime + sigL+sigB) {

          led = 0;

        } else if (currentTime < stateStartTime + sigL+sigB+sigS) {

          led = 1;

        } else if (currentTime < stateStartTime + sigL+sigB+sigS+sigB) {

          led = 0;

        } else if (currentTime < stateStartTime + sigL+sigB+sigS+sigB+sigL) {

          led = 1;

        } else if (currentTime < stateStartTime + sigL+sigB+sigS+sigB+sigL+letterBreakTime) {

          led = 0;

        } else {

          state = BLINK_SUCCESS_BREAK;

          ++loop;

          stateStartTime = currentTime;

        }

        break;

      }

      case BLINK_SUCCESS_BREAK:

      {

        if (currentTime >= stateStartTime + wordBreakTime) {

          state = BLINK_SUCCESS_O;

          stateStartTime = currentTime;

        }

        break;

      }

    }

    setLed(led);

  }

  return;

}

/*

 * Shortcut to make the LED blink OK infinitely.

 */

inline void blinkOKinf() {

  blinkOK(0);

  return;

}

/*

 * Makes the LED visualize the specified data.

 * Starting with the MSB of the first of the 'n' bytes, zeros are visualized as short flash and ones as long flash.

 * If the specified number of loops is zero, the function will loop infinitely.

 */

void visualizeData(uint8_t* data, uint32_t bytes, uint32_t loops) {

  /* initialize some variables and constants */

  enum State {BLINK_DATA_BIT,

              BLINK_DATA_BYTE_BREAK,

              BLINK_DATA_LOOP_BREAK

             } state = BLINK_DATA_BIT;

  uint8_t led = 0;

  uint8_t mask = 0x80;

  uint32_t byte = 0;

  uint32_t loop = 0;

  const uint32_t sigS = 50;

  const uint32_t sigL = 200;

  const uint32_t interBitBreak = 500;

  const uint32_t interByteBreak = 1000;

  const uint32_t interLoopBreak = 2500;

  uint32_t flash_dur = 0;

  uint32_t stateStartTime = 0;

  saTimerUpdate(&stateStartTime);

  uint32_t currentTime = stateStartTime;

  /* return immediately if the number of bytes is zero */

  if (bytes == 0) {

    return;

  }

  /* either loop the specified number, or infinetly */

  while (loop < loops || loops == 0) {

    led = 0;

    saTimerUpdate(&currentTime);

    switch (state) {

      case BLINK_DATA_BIT:

      {

        if (data[byte] & mask) {

          flash_dur = sigL;

        } else {

          flash_dur = sigS;

        }

        if (currentTime < stateStartTime + flash_dur) {

          led = 1;

        } else if (currentTime < stateStartTime + flash_dur+interBitBreak) {

          led = 0;

        } else {

          mask = mask >> 1;

          if (mask > 0) {

            state = BLINK_DATA_BIT;

          } else if (byte < bytes-1) {

            state = BLINK_DATA_BYTE_BREAK;

          } else {

            state = BLINK_DATA_LOOP_BREAK;

            ++loop;

          }

          stateStartTime = currentTime;

        }

        break;

      }

      case BLINK_DATA_BYTE_BREAK:

      {

        if (currentTime >= stateStartTime + interByteBreak) {

          mask = 0x80;

          state = BLINK_DATA_BIT;

          ++byte;

          stateStartTime = currentTime;

        }

        break;

      }

      case BLINK_DATA_LOOP_BREAK:

      {

        if (currentTime >= stateStartTime + interLoopBreak) {

          mask = 0x80;

          state = BLINK_DATA_BIT;

          byte = 0;

          stateStartTime = currentTime;

        }

        break;

      }

    }

    setLed(led);

  }

  return;

}

/*

 * Makes the LED visualize the specified byte.

 * Starting with the MSB, zeros are visualized as short flash and ones as long flash.

 * If the specified number of loops is zero, the function will loop infinitely.

 */

void visualizeByte(uint8_t byte, uint32_t loops) {

  visualizeData(&byte, 1, loops);

  return;

}