/*
*
* FM0+ Example program 
* This program reads the analog voltage on AN19 and uses it to adjust the 
* PWM output on TIOA5
*
*This example was based in part on the FM0+ examples by Edison Zhang, Spansion Corp. 
*
**/ 

/*Includes*/ 
#include "pdl_header.h"

/*Defines*/ 
#define User_Timer  BT5
              
/*Globals*/ 

//PWM globals 
uint16_t Pulse_Value =  9999;     //Duty Cycle Value
stc_bt_pwm_config_t stcPwmConfig; //PWM Configuration Structure


//ADC globals 
stc_adcn_t       *pstcAdc = (stc_adcn_t *)&ADC0;
stc_adc_config_t stcConfig;                   
stc_adc_prio_t   stcPrioCfg;
uint16_t         ADC_Val          = 0;   //ADC Voltage Reading 
uint32_t         ADC_READ         = 0;   //ADC FIFO Data   
uint32_t         Sample_Count     = 10;  

/*Function prototypes*/ 
void ConfigurePWM(void);  
void ConfigureADC(void); 
   
/*Main*/ 
int32_t main(void)
{
   
   /* Initialize GPIO pin as PWM pin..aka map the base timer to the correct IO port  */ 
    SetPinFunc_TIOA5_1_OUT();
    
    /*Configure ADC*/ 
    ConfigureADC();
    
    /*Configure and Start PWM*/ 
    ConfigurePWM(); 
    
    
    /*Start ADC*/ 
    if ( Adc_Init(pstcAdc, &stcConfig) == Ok)        //Init ADC0
    {
        Adc_EnableWaitReady(pstcAdc);               //Enable ADC0 & wait for initialization
    }
    
    
    /* Read ADC and adjust Duty Cycle*/ 
    while(1)
    {          
        
        Adc_SwTriggerPrio(pstcAdc);                 //Trigger ADC0

        while (1)
        {
            if (TRUE == Adc_GetIrqFlag(pstcAdc, AdcPrioIrq)) //Wait for ADC conversion 
            {
                Adc_ClrIrqFlag(pstcAdc, AdcPrioIrq);
                break;
            }
        }
        
        ADC_READ = Adc_ReadPrioFifo(pstcAdc); //Read ADC FIFO 
        
        ADC_Val = Adc_GetPrioData(pstcAdc, ADC_READ); //Get voltage reading 
        
        Pulse_Value = 9999 - ADC_Val*2; //Scale Duty Cycle to ADC reading 
        
        Bt_Pwm_WriteDutyVal(&User_Timer,Pulse_Value);//Write new Duty Cycle 
        
        
     }; 
 
}


void ConfigurePWM(void)
{ 
   /*Wipe structure*/ 
    PDL_ZERO_STRUCT(stcPwmConfig);
    
  /*Configure and Initialize PWM timer*/ 
    stcPwmConfig.enPres = PwmPres1Div4;              //20Mhz/4 = 5Mhz PWM clock
    stcPwmConfig.enMode = PwmContinuous;             //Enable continous mode
    stcPwmConfig.enExtTrig = PwmExtTrigDisable;      //Disable External Trigger
    stcPwmConfig.enOutputMask = PwmOutputNormal;     //Normal Output (no Mask) 
    stcPwmConfig.enOutputPolarity = PwmPolarityLow;  //Initial Polarity Low 
    stcPwmConfig.enRestartEn = PwmRestartEnable;     //Restart Enabled 
    Bt_Pwm_Init(&User_Timer , &stcPwmConfig);        //Init PWM with new Config  
    
    
    /* Set I/O mode */ 
    Bt_ConfigIOMode(&User_Timer, BtIoMode0);
    
    
    /* Set cycle and duty value*/ 
    Bt_Pwm_WriteCycleVal(&User_Timer, 9999); // Cycle = 200us
    Bt_Pwm_WriteDutyVal(&User_Timer,  Pulse_Value); // Duty = start at 100%
            
    /*Enable Counter Operation*/ 
    Bt_Pwm_EnableCount(&User_Timer);
    
    /*Enable Software Trigger/Start PWM timer*/ 
    Bt_Pwm_EnableSwTrig(&User_Timer);
} 

void ConfigureADC(void)
{
    /*Wipe structures*/
    PDL_ZERO_STRUCT(stcConfig);
    PDL_ZERO_STRUCT(stcPrioCfg);
    
    /*Initialize priority conversion*/
    stcPrioCfg.bPrioExtTrigStartEnable = FALSE; //Disable External trigger 
    stcPrioCfg.bPrioTimerStartEnable = FALSE;   //Disable Tiimer trigger start
    stcPrioCfg.enPrioTimerTrigger = AdcNoTimer; //Disable Trigger timer 
    stcPrioCfg.u8PrioFifoDepth = 0;             //Set FIFO depth = 1 reading
    stcPrioCfg.u8PrioLevel1AnalogChSel = 0;
    stcPrioCfg.u8PrioLevel2AnalogChSel = 19;    //Select ADC input pin AN19
    
    stcConfig.u32SamplingTimeSelect.u32AD_CHn = 0; //Sample on channel 0  
    stcConfig.enSamplingTimeN0 = Value8;    //ST N0 Config bits 
    stcConfig.u8SamplingTime0 = 8u;         //ST value for 0
    stcConfig.enSamplingTimeN1 = Value8;    //ST N1 Config bits 
    stcConfig.u8SamplingTime1 = 8u;         //ST value for 1 
    stcConfig.u8ComparingClockDiv = 3u;     //Frequency division ratio 
    stcConfig.pstcPrioInit = &stcPrioCfg;   
}