void play_song(int* notebuf, int* accidentalsbuf, int* octavebuf, int length) {
PWM_1_Start();
PWM_2_Start();
PWM_3_Start();
PWM_4_Start();
for (int i = 0; i < length; i+=4) {
PWM_1_WriteCompare((note_lengths[note_lookup[notebuf[i]]+accidentalsbuf[i]]/2)>>octavebuf[i]);
PWM_1_WritePeriod(note_lengths[note_lookup[notebuf[i]]+accidentalsbuf[i]]>>octavebuf[i]);
PWM_1_WriteCounter(0);
PWM_2_WriteCompare((note_lengths[note_lookup[notebuf[i+1]]+accidentalsbuf[i]]/2)>>octavebuf[i+1]);
PWM_2_WritePeriod(note_lengths[note_lookup[notebuf[i+1]]+accidentalsbuf[i]]>>octavebuf[i+1]);
PWM_2_WriteCounter(0);
PWM_3_WriteCompare((note_lengths[note_lookup[notebuf[i+2]]+accidentalsbuf[i]]/2)>>octavebuf[i+2]);
PWM_3_WritePeriod(note_lengths[note_lookup[notebuf[i+2]]+accidentalsbuf[i]]>>octavebuf[i+2]);
PWM_3_WriteCounter(0);
PWM_4_WriteCompare((note_lengths[note_lookup[notebuf[i+3]]+accidentalsbuf[i]]/2)>>octavebuf[i+3]);
PWM_4_WritePeriod(note_lengths[note_lookup[notebuf[i+3]]+accidentalsbuf[i]]>>octavebuf[i+3]);
PWM_4_WriteCounter(0);
if (Keypad_1_Status_Reg_Read() & 0x10) break;
CyDelay(TEMPO_MS);
}
PWM_1_Stop();
PWM_2_Stop();
PWM_3_Stop();
PWM_4_Stop();
}
/*******************************************************************************
* Function Name: PWM_4_Init
********************************************************************************
*
* Summary:
* Initialize component's parameters to the parameters set by user in the
* customizer of the component placed onto schematic. Usually called in
* PWM_4_Start().
*
* Parameters:
* None
*
* Return:
* None
*
*******************************************************************************/
void PWM_4_Init(void)
{
#if (PWM_4_UsingFixedFunction || PWM_4_UseControl)
uint8 ctrl;
#endif /* (PWM_4_UsingFixedFunction || PWM_4_UseControl) */
#if(!PWM_4_UsingFixedFunction)
#if(PWM_4_UseStatus)
/* Interrupt State Backup for Critical Region*/
uint8 PWM_4_interruptState;
#endif /* (PWM_4_UseStatus) */
#endif /* (!PWM_4_UsingFixedFunction) */
#if (PWM_4_UsingFixedFunction)
/* You are allowed to write the compare value (FF only) */
PWM_4_CONTROL |= PWM_4_CFG0_MODE;
#if (PWM_4_DeadBand2_4)
PWM_4_CONTROL |= PWM_4_CFG0_DB;
#endif /* (PWM_4_DeadBand2_4) */
ctrl = PWM_4_CONTROL3 & ((uint8 )(~PWM_4_CTRL_CMPMODE1_MASK));
PWM_4_CONTROL3 = ctrl | PWM_4_DEFAULT_COMPARE1_MODE;
/* Clear and Set SYNCTC and SYNCCMP bits of RT1 register */
PWM_4_RT1 &= ((uint8)(~PWM_4_RT1_MASK));
PWM_4_RT1 |= PWM_4_SYNC;
/*Enable DSI Sync all all inputs of the PWM*/
PWM_4_RT1 &= ((uint8)(~PWM_4_SYNCDSI_MASK));
PWM_4_RT1 |= PWM_4_SYNCDSI_EN;
#elif (PWM_4_UseControl)
/* Set the default compare mode defined in the parameter */
ctrl = PWM_4_CONTROL & ((uint8)(~PWM_4_CTRL_CMPMODE2_MASK)) & ((uint8)(~PWM_4_CTRL_CMPMODE1_MASK));
PWM_4_CONTROL = ctrl | PWM_4_DEFAULT_COMPARE2_MODE |
PWM_4_DEFAULT_COMPARE1_MODE;
#endif /* (PWM_4_UsingFixedFunction) */
#if (!PWM_4_UsingFixedFunction)
#if (PWM_4_Resolution == 8)
/* Set FIFO 0 to 1 byte register for period*/
PWM_4_AUX_CONTROLDP0 |= (PWM_4_AUX_CTRL_FIFO0_CLR);
#else /* (PWM_4_Resolution == 16)*/
/* Set FIFO 0 to 1 byte register for period */
PWM_4_AUX_CONTROLDP0 |= (PWM_4_AUX_CTRL_FIFO0_CLR);
PWM_4_AUX_CONTROLDP1 |= (PWM_4_AUX_CTRL_FIFO0_CLR);
#endif /* (PWM_4_Resolution == 8) */
PWM_4_WriteCounter(PWM_4_INIT_PERIOD_VALUE);
#endif /* (!PWM_4_UsingFixedFunction) */
PWM_4_WritePeriod(PWM_4_INIT_PERIOD_VALUE);
#if (PWM_4_UseOneCompareMode)
PWM_4_WriteCompare(PWM_4_INIT_COMPARE_VALUE1);
#else
PWM_4_WriteCompare1(PWM_4_INIT_COMPARE_VALUE1);
PWM_4_WriteCompare2(PWM_4_INIT_COMPARE_VALUE2);
#endif /* (PWM_4_UseOneCompareMode) */
#if (PWM_4_KillModeMinTime)
PWM_4_WriteKillTime(PWM_4_MinimumKillTime);
#endif /* (PWM_4_KillModeMinTime) */
#if (PWM_4_DeadBandUsed)
PWM_4_WriteDeadTime(PWM_4_INIT_DEAD_TIME);
#endif /* (PWM_4_DeadBandUsed) */
#if (PWM_4_UseStatus || PWM_4_UsingFixedFunction)
PWM_4_SetInterruptMode(PWM_4_INIT_INTERRUPTS_MODE);
#endif /* (PWM_4_UseStatus || PWM_4_UsingFixedFunction) */
#if (PWM_4_UsingFixedFunction)
/* Globally Enable the Fixed Function Block chosen */
PWM_4_GLOBAL_ENABLE |= PWM_4_BLOCK_EN_MASK;
/* Set the Interrupt source to come from the status register */
PWM_4_CONTROL2 |= PWM_4_CTRL2_IRQ_SEL;
#else
#if(PWM_4_UseStatus)
/* CyEnterCriticalRegion and CyExitCriticalRegion are used to mark following region critical*/
/* Enter Critical Region*/
PWM_4_interruptState = CyEnterCriticalSection();
/* Use the interrupt output of the status register for IRQ output */
PWM_4_STATUS_AUX_CTRL |= PWM_4_STATUS_ACTL_INT_EN_MASK;
/* Exit Critical Region*/
CyExitCriticalSection(PWM_4_interruptState);
/* Clear the FIFO to enable the PWM_4_STATUS_FIFOFULL
bit to be set on FIFO full. */
PWM_4_ClearFIFO();
#endif /* (PWM_4_UseStatus) */
#endif /* (PWM_4_UsingFixedFunction) */
}