ccny_asctec_firmware: adc.c Source File

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00001 /*****************************************************************************
00002  *   adc.c:  ADC module file for Philips LPC214x Family Microprocessors
00003  *
00004  *   Copyright(C) 2006, Philips Semiconductor
00005  *   All rights reserved.
00006  *
00007  *   History
00008  *   2005.10.01  ver 1.00    Prelimnary version, first Release
00009  *
00010 ******************************************************************************/
00011 #include "LPC214x.h"                        /* LPC21xx definitions */
00012 #include "type.h"
00013 #include "irq.h"
00014 #include "target.h"
00015 #include "adc.h"
00016 
00017 volatile unsigned int ADC0Value[ADC_NUM], ADC1Value[ADC_NUM];
00018 volatile unsigned int ADC0IntDone = 0, ADC1IntDone = 0;
00019 
00020 #if ADC_INTERRUPT_FLAG
00021 /******************************************************************************
00022 ** Function name:               ADC0Handler
00023 **
00024 ** Descriptions:                ADC0 interrupt handler
00025 **
00026 ** parameters:                  None
00027 ** Returned value:              None
00028 ** 
00029 ******************************************************************************/
00030 void ADC0Handler (void) __irq 
00031 {
00032     unsigned int regVal;
00033   
00034     IENABLE;                    /* handles nested interrupt */
00035 
00036     regVal = AD0STAT;           /* Read ADC will clear the interrupt */
00037     if ( regVal & 0x0000FF00 )  /* check OVERRUN error first */
00038     {
00039         regVal = (regVal & 0x0000FF00) >> 0x08;
00040                                 /* if overrun, just read ADDR to clear */
00041                                 /* regVal variable has been reused. */
00042         switch ( regVal )
00043         {
00044             case 0x01:
00045                 regVal = AD0DR0;
00046                 break;
00047             case 0x02:
00048                 regVal = AD0DR1;
00049                 break;
00050             case 0x04:
00051                 regVal = AD0DR2;
00052                 break;
00053             case 0x08:
00054                 regVal = AD0DR3;
00055                 break;
00056             case 0x10:
00057                 regVal = AD0DR4;
00058                 break;
00059             case 0x20:
00060                 regVal = AD0DR5;
00061                 break;
00062             case 0x40:
00063                 regVal = AD0DR6;
00064                 break;
00065             case 0x80:
00066                 regVal = AD0DR7;
00067                 break;
00068             default:
00069                 break;
00070         }
00071         AD0CR &= 0xF8FFFFFF;    /* stop ADC now */ 
00072         ADC0IntDone = 1;
00073         return; 
00074     }
00075     
00076     if ( regVal & ADC_ADINT )
00077     {
00078         switch ( regVal & 0xFF )        /* check DONE bit */
00079         {
00080             case 0x01:
00081                 ADC0Value[0] = ( AD0DR0 >> 6 ) & 0x3FF;
00082                 break;
00083             case 0x02:
00084                 ADC0Value[1] = ( AD0DR1 >> 6 ) & 0x3FF;
00085                 break;
00086             case 0x04:
00087                 ADC0Value[2] = ( AD0DR2 >> 6 ) & 0x3FF;
00088                 break;
00089             case 0x08:
00090                 ADC0Value[3] = ( AD0DR3 >> 6 ) & 0x3FF;
00091                 break;
00092             case 0x10:
00093                 ADC0Value[4] = ( AD0DR4 >> 6 ) & 0x3FF;
00094                 break;
00095             case 0x20:
00096                 ADC0Value[5] = ( AD0DR5 >> 6 ) & 0x3FF;
00097                 break;
00098             case 0x40:
00099                 ADC0Value[6] = ( AD0DR6 >> 6 ) & 0x3FF;
00100                 break;
00101             case 0x80:
00102                 ADC0Value[7] = ( AD0DR7 >> 6 ) & 0x3FF;
00103                 break;          
00104             default:
00105                 break;
00106         }
00107         AD0CR &= 0xF8FFFFFF;    /* stop ADC now */ 
00108         ADC0IntDone = 1;
00109     }
00110 
00111     IDISABLE;
00112     VICVectAddr = 0;            /* Acknowledge Interrupt */
00113 }
00114 
00115 /******************************************************************************
00116 ** Function name:               ADC1Handler
00117 **
00118 ** Descriptions:                ADC1 interrupt handler
00119 **
00120 ** parameters:                  None
00121 ** Returned value:              None
00122 ** 
00123 ******************************************************************************/
00124 void ADC1Handler (void) __irq 
00125 {
00126     unsigned int regVal;
00127   
00128     IENABLE;                    /* handles nested interrupt */
00129 
00130     regVal = AD1STAT;           /* Read ADC will clear the interrupt */
00131     if ( regVal & 0x0000FF00 )  /* check OVERRUN error first */
00132     {
00133         regVal = (regVal & 0x0000FF00) >> 0x08;
00134                                 /* if overrun, just read AD1DRx to clear */
00135                                 /* regVal variable has been reused. */
00136         switch ( regVal )
00137         {
00138             case 0x01:
00139                 regVal = AD1DR0;
00140                 break;
00141             case 0x02:
00142                 regVal = AD1DR1;
00143                 break;
00144             case 0x04:
00145                 regVal = AD1DR2;
00146                 break;
00147             case 0x08:
00148                 regVal = AD1DR3;
00149                 break;
00150             case 0x10:
00151                 regVal = AD1DR4;
00152                 break;
00153             case 0x20:
00154                 regVal = AD1DR5;
00155                 break;
00156             case 0x40:
00157                 regVal = AD1DR6;
00158                 break;
00159             case 0x80:
00160                 regVal = AD1DR7;
00161                 break;
00162             default:
00163                 break;
00164         }
00165         AD1CR &= 0xF8FFFFFF;    /* stop ADC now */ 
00166         ADC1IntDone = 1;
00167         return; 
00168     }
00169     
00170     if ( regVal & ADC_ADINT )
00171     {
00172         switch ( regVal & 0xFF )        /* check DONE bit */
00173         {
00174             case 0x01:
00175                 ADC1Value[0] = ( AD1DR0 >> 6 ) & 0x3FF;
00176                 break;
00177             case 0x02:
00178                 ADC1Value[1] = ( AD1DR1 >> 6 ) & 0x3FF;
00179                 break;
00180             case 0x04:
00181                 ADC1Value[2] = ( AD1DR2 >> 6 ) & 0x3FF;
00182                 break;
00183             case 0x08:
00184                 ADC1Value[3] = ( AD1DR3 >> 6 ) & 0x3FF;
00185                 break;
00186             case 0x10:
00187                 ADC1Value[4] = ( AD1DR4 >> 6 ) & 0x3FF;
00188                 break;          
00189             case 0x20:
00190                 ADC1Value[5] = ( AD1DR5 >> 6 ) & 0x3FF;
00191                 break;
00192             case 0x40:
00193                 ADC1Value[6] = ( AD1DR6 >> 6 ) & 0x3FF;
00194                 break;
00195             case 0x80:
00196                 ADC1Value[7] = ( AD1DR7 >> 6 ) & 0x3FF;
00197                 break;          
00198             default:
00199                 break;
00200         }
00201         AD1CR &= 0xF8FFFFFF;    /* stop ADC now */ 
00202         ADC1IntDone = 1;
00203     }
00204 
00205     IDISABLE;
00206     VICVectAddr = 0;            /* Acknowledge Interrupt */
00207 }
00208 #endif
00209 
00210 /*****************************************************************************
00211 ** Function name:               ADCInit
00212 **
00213 ** Descriptions:                initialize ADC channel
00214 **
00215 ** parameters:                  ADC clock rate
00216 ** Returned value:              true or false
00217 ** 
00218 *****************************************************************************/
00219 unsigned int ADCInit( unsigned int ADC_Clk )
00220 {
00221       AD0CR = ( 0x01 << 0 ) |   // SEL=1,select channel 0, 1 to 4 on ADC0
00222         ( ( Fpclk / ADC_Clk - 1 ) << 8 ) |  // CLKDIV = Fpclk / 1000000 - 1 
00223         ( 0 << 16 ) |           // BURST = 0, no BURST, software controlled
00224         ( 0 << 17 ) |           // CLKS = 0, 11 clocks/10 bits 
00225         ( 1 << 21 ) |           // PDN = 1, normal operation 
00226         ( 0 << 22 ) |           // TEST1:0 = 00 
00227         ( 0 << 24 ) |           // START = 0 A/D conversion stops
00228         ( 0 << 27 );            /* EDGE = 0 (CAP/MAT singal falling,trigger A/D 
00229                                 conversion) */
00230     AD1CR = ( 0x01 << 0 ) |     // SEL=1,select channel 0, 0 to 7 on ADC1
00231         ( ( Fpclk / ADC_Clk - 1 ) << 8 ) |  // CLKDIV = Fpclk / 1000000 - 1 
00232         ( 0 << 16 ) |           // BURST = 0, no BURST, software controlled 
00233         ( 0 << 17 ) |           // CLKS = 0, 11 clocks/10 bits 
00234         ( 1 << 21 ) |           // PDN = 1, normal operation 
00235         ( 0 << 22 ) |           // TEST1:0 = 00 
00236         ( 0 << 24 ) |           // START = 0 A/D conversion stops
00237         ( 0 << 27 );            /* EDGE = 0 (CAP/MAT singal falling,trigger A/D 
00238                                 conversion) */
00239 
00240     /* If POLLING, no need to do the following */
00241 #if ADC_INTERRUPT_FLAG
00242     AD0INTEN = 0x11E;           // Enable all interrupts 
00243     AD1INTEN = 0x1FF;
00244 
00245     if ( install_irq( ADC0_INT, (void *)ADC0Handler ) == FALSE )
00246     {
00247         return (FALSE);
00248     }
00249     if ( install_irq( ADC1_INT, (void *)ADC1Handler ) == FALSE )
00250     {
00251         return (FALSE);
00252     }
00253 #endif
00254 
00255     return (TRUE);
00256 }
00257 
00258 /*****************************************************************************
00259 ** Function name:               ADC0Read
00260 **
00261 ** Descriptions:                Read ADC0 channel
00262 **
00263 ** parameters:                  Channel number
00264 ** Returned value:              Value read, if interrupt driven, return channel #
00265 ** 
00266 *****************************************************************************/
00267 unsigned int ADC0Read( unsigned char channelNum )
00268 {
00269 #if !ADC_INTERRUPT_FLAG
00270     unsigned int regVal, ADC_Data;
00271     volatile unsigned int timeout=0;
00272 #endif
00273 
00274     /* channel number is 0 through 7 */
00275     if ( channelNum >= ADC_NUM )
00276     {
00277         channelNum = 0;         /* reset channel number to 0 */
00278     }
00279     AD0CR &= 0xFFFFFF00;
00280     AD0CR |= (1 << 24) | (1 << channelNum);     
00281                                 /* switch channel,start A/D convert */
00282 #if !ADC_INTERRUPT_FLAG
00283     while ( timeout++<5000 )                    /* wait until end of A/D convert */
00284     {
00285         regVal = *(volatile unsigned long *)(AD0_BASE_ADDR 
00286                         + ADC_OFFSET + ADC_INDEX * channelNum);
00287                                 /* read result of A/D conversion */
00288         if ( regVal & ADC_DONE )
00289         {
00290             break;
00291         }
00292     }   
00293         
00294     AD0CR &= 0xF8FFFFFF;        /* stop ADC now */    
00295     if ( regVal & ADC_OVERRUN ) /* save data when it's not overrun
00296                                 otherwise, return zero */
00297     {
00298         return ( 0 );
00299     }
00300     ADC_Data = ( regVal >> 6 ) & 0x3FF;
00301     return ( ADC_Data );        /* return A/D conversion value */
00302 #else
00303     return ( channelNum );      /* if it's interrupt driven, the 
00304                                 ADC reading is done inside the handler.
00305                                 so, return channel number */
00306 #endif
00307 }
00308 
00309 /*****************************************************************************
00310 ** Function name:               ADC1Read
00311 **
00312 ** Descriptions:                Read ADC1 channel
00313 **
00314 ** parameters:                  Channel number
00315 ** Returned value:              Value read, if interrupt driven, return channel #
00316 ** 
00317 *****************************************************************************/
00318 unsigned int ADC1Read( unsigned char channelNum )
00319 {
00320 #if !ADC_INTERRUPT_FLAG
00321     unsigned int regVal;
00322         unsigned int ADC_Data;
00323 #endif
00324 
00325     /* channel number is 0 through 7 */
00326     if ( channelNum >= ADC_NUM )
00327     {
00328         channelNum = 0;         /* reset channel number to 0 */
00329     }
00330     AD1CR &= 0xFFFFFF00;
00331     AD1CR |= (1 << 24) | (1 << channelNum);     
00332                                 /* switch channel,start A/D convert */
00333 #if !ADC_INTERRUPT_FLAG
00334     while ( 1 )                 /* wait until end of A/D convert */
00335     {
00336         regVal = *(volatile unsigned long *)(AD1_BASE_ADDR 
00337                         + ADC_OFFSET + ADC_INDEX * channelNum);
00338                                 /* read result of A/D conversion */
00339         if ( regVal & ADC_DONE )
00340         {
00341             break;
00342         }
00343     }   
00344         
00345     AD1CR &= 0xF8FFFFFF;        /* stop ADC now */
00346     if ( regVal & ADC_OVERRUN ) /* save data when it's not overrun
00347                                 otherwise, return zero */
00348     {
00349         return ( 0 );
00350     }
00351     
00352     ADC_Data = ( regVal >> 6 ) & 0x3FF;
00353     return ( ADC_Data );        /* return A/D conversion value */
00354 #else
00355     return ( channelNum );
00356 #endif
00357 }
00358 
00359 /*********************************************************************************
00360 **                            End Of File
00361 *********************************************************************************/