LPC2k_ee.c
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00001 /****************************************************************************************/
00002 /*                                                                                              */
00003 /*  LPC2k_ee.C:  basic LPC213x EEPROM routines (rev 1.1, Jan 27th, 2006.)                               */
00004 /*                                                                                              */
00005 /* Functions provided here:                                                                                                                             */
00006 /*                                                                                          */
00007 /* ee_erase(command_ee, result_ee[]):   erases all EEPROM                                                               */
00008 /* ee_write(command_ee, result_ee[]):   writes record of ee_data (defined in LPC2k_ee.h)*/
00009 /* ee_read(command_ee, result_ee[]) :   reads the last record added into EEPROM                 */
00010 /* ee_readn(command_ee, result_ee[]):   reads the n-th record in EEPROM                                 */
00011 /* ee_count(command_ee, result_ee[]):   counts records of ee_data type in EEPROM                */
00012 /*                                                                                                      */
00013 /****************************************************************************************/
00014 
00015 #include "LPC214x.h"
00016 #define _EEPROM_
00017 #include "LPC2k_ee.h"                                   /* LPC2000 EEPROM definitions */
00018 #undef _EEPROM_
00019 #define IAP_LOCATION                    0x7ffffff1
00020 
00021 //const unsigned char eeprom[EE_SIZE] _at_ EE_ADDR_L;
00022 void ee_erase(unsigned int ,unsigned int[]);    //function erases EEPROM
00023 void ee_write(unsigned int ,unsigned int[]);    //function adds a record in EEPROM
00024 void ee_read (unsigned int ,unsigned int[]);    //function reads the latest valid record in EEPROM
00025 void ee_count(unsigned int ,unsigned int[]);    //function counts records in EEPROM
00026 void ee_readn(unsigned int ,unsigned int[]);    //function reads n-th record in EEPROM
00027 int ee_locate(void);                                                            //function locates the next available location
00028 
00029 typedef void (*IAP)(unsigned int [],unsigned int[]);
00030 IAP iap_entry;
00031 
00032 /************************************************************************/
00033 /*                                                                      */
00034 /* function:                                                                                                                    */
00035 /*  void ee_erase(unsigned int command_ee,unsigned int result_ee[])             */
00036 /*                                                                      */
00037 /* type: void                                                           */
00038 /*                                                                      */
00039 /* parameters:                                                                                                                  */
00040 /*      command_ee   - Not used.                                                        */
00041 /*  result_ee[0] - Returns a response to the last IAP command used.             */
00042 /*                 0 - EEPROM successfully erased.                                              */
00043 /*                 For all other response values, see microcontroller   */
00044 /*                                 User Manual, IAP Commands and Status Codes Summary.  */
00045 /*  result_ee[1] - Not used.                                                    */
00046 /*                                                                      */
00047 /* version: 1.1 (01/27/2006)                                            */
00048 /*                                                                      */
00049 /* constants defined in LPC2k_ee.h used in this function:               */
00050 /*  EE_SEC_L     - microcontroller's Flash sector where EEPROM begins   */
00051 /*  EE_SEC_H     - microcontroller's Flash sector where EEPROM ends             */
00052 /*  EE_CCLK              - microcontroller's system clock (cclk)                */
00053 /*                                                                      */
00054 /* description:                                                                                                                 */
00055 /*  This function erases LPC2000 on-chip Flash sectors selected to act  */
00056 /*  as an EEPROM. All Flash sectors between EE_SEC_L abd EE_SEC_H               */
00057 /*  (including these sectors) will be erased using the In Application   */
00058 /*  Programming (IAP) routines (see User Manual for more details).              */
00059 /*  Also, this function disables all interrupts while erasing the       */
00060 /*  EEPROM. If this is not needed, three lines of the ee_erase          */
00061 /*  subroutine can simply be commented-out without affecting the        */
00062 /*  routine performance at all.                                         */
00063 /*                                                                      */
00064 /* revision history:                                                    */
00065 /* - Rev. 1.1 adds interrupt disable feature.                                                   */
00066 /*                                                                      */
00067 /************************************************************************/
00068 void ee_erase(unsigned int command_ee,unsigned int result_ee[]){
00069         unsigned int command_iap[5];
00070         unsigned int result_iap[3];
00071         unsigned long int enabled_interrupts;
00072 
00073         enabled_interrupts = VICIntEnable;  //disable all interrupts
00074         VICIntEnClr        = enabled_interrupts;
00075 
00076         command_iap[0]=50;                                      //prepare sectors from EE_SEC_L to EE_SEC_H for erase
00077         command_iap[1]=EE_SEC_L;
00078         command_iap[2]=EE_SEC_H;
00079         iap_entry=(IAP) IAP_LOCATION;
00080         iap_entry(command_iap,result_iap);
00081 
00082         command_iap[0]=52;                                      //erase sectors from EE_SEC_L to EE_SEC_H
00083         command_iap[1]=EE_SEC_L;
00084         command_iap[2]=EE_SEC_H;
00085         command_iap[3]=EE_CCLK;
00086         iap_entry=(IAP) IAP_LOCATION;
00087         iap_entry(command_iap,result_iap);
00088 
00089         command_iap[0]=53;                                      //blankcheck sectors from EE_SEC_L to EE_SEC_H
00090         command_iap[1]=EE_SEC_L;
00091         command_iap[2]=EE_SEC_H;
00092         iap_entry=(IAP) IAP_LOCATION;
00093         iap_entry(command_iap,result_iap);
00094 
00095         VICIntEnable = enabled_interrupts;  //restore interrupt enable register
00096 
00097         result_ee[0]=result_iap[0];
00098         return;
00099 }
00100 
00101 /************************************************************************/
00102 /*                                                                      */
00103 /* function:                                                                                                                    */
00104 /*  void ee_write(unsigned int command_ee,unsigned int result_ee[])             */
00105 /*                                                                      */
00106 /* type: void                                                           */
00107 /*                                                                      */
00108 /* parameters:                                                                                                                  */
00109 /*      command_ee   - An address of a content of ee_data type that has         */
00110 /*                 to be programmed into EEPROM.                        */
00111 /*  result_ee[0] - Returns a response to the last IAP command used.             */
00112 /*                 0 - data successfully programmed in EEPROM.                  */
00113 /*               501 - no space in EEPROM to program data.              */
00114 /*                 For all other response values, see microcontroller   */
00115 /*                                 User Manual, IAP Commands and Status Codes Summary.  */
00116 /*  result_ee[1] - Not used.                                                    */
00117 /*                                                                      */
00118 /* version: 1.1 (01/27/2006)                                            */
00119 /*                                                                      */
00120 /* constants defined in LPC2k_ee.h used in this function:               */
00121 /*  EE_BUFFER_SIZE         - IAP buffer size; must be 256 or 512                        */
00122 /*  NO_SPACE_IN_EEPROM - EEPROM is full and no data can be programmed   */
00123 /*  EE_BUFFER_MASK         - parameter used for interfacing with IAP            */
00124 /*  EE_REC_SIZE            - ee_data structure size in bytes                    */
00125 /*  EE_SEC_L               - micro's Flash sector where EEPROM begins           */
00126 /*  EE_SEC_H               - micro's Flash sector where EEPROM ends                     */
00127 /*  EE_CCLK                        - micro's system clock (cclk)                        */
00128 /*                                                                      */
00129 /* description:                                                                                                                 */
00130 /*  This function writes a single structure of ee_data type into the    */
00131 /*  EEPROM using an In Application      Programming (IAP) routines (see         */
00132 /*  User Manual for more details). command_ee contains an address of    */
00133 /*  this structure. EEPROM is scanned for the last (if any) record              */
00134 /*  identifier (EE_REC_ID), and a new record is added next to it.       */
00135 /*  Also, this function disables all interrupts while erasing the       */
00136 /*  EEPROM. If this is not needed, three lines of the ee_write          */
00137 /*  subroutine can simply be commented-out without affecting the        */
00138 /*  routine performance at all.                                         */
00139 /*                                                                      */
00140 /* revision history:                                                    */
00141 /* - Rev. 1.1 fixes a bug related to verifying a content written into   */
00142 /*   the EEPROM. 1.0 was reporting missmatch even when there were no    */
00143 /*   problems at all.                                                                                                   */
00144 /*   Rev. 1.1 adds interrupt disable feature.                                                   */
00145 /*                                                                      */
00146 /************************************************************************/
00147 void ee_write(unsigned int command_ee,unsigned int result_ee[]){
00148         int location;
00149         unsigned int *source, *destination, i;
00150         unsigned char ee_buffer[EE_BUFFER_SIZE];
00151         unsigned int command_iap[5], result_iap[3];
00152         unsigned long int enabled_interrupts;
00153 
00154         location = ee_locate();
00155         if (location == -1){
00156                 result_ee[0]=NO_SPACE_IN_EEPROM;
00157         }
00158         else{
00159                 for (i=0;i<EE_BUFFER_SIZE;i++) ee_buffer[i]=0xFF;
00160 
00161                 destination = (unsigned int *) ((&ee_buffer[0])+((unsigned int)location & EE_BUFFER_MASK));
00162                 source = (unsigned int *) command_ee;
00163                 for(i=0;i!=EE_REC_SIZE/4;i++) *(destination+i) = *(source+i);
00164 
00165                 enabled_interrupts = VICIntEnable;  //disable all interrupts
00166                 VICIntEnClr        = enabled_interrupts;
00167 
00168                 command_iap[0]=50;                                      //prepare sectors from EE_SEC_L to EE_SEC_H for erase
00169                 command_iap[1]=EE_SEC_L;
00170                 command_iap[2]=EE_SEC_H;
00171                 iap_entry=(IAP) IAP_LOCATION;
00172                 iap_entry(command_iap,result_iap);
00173 
00174                 command_iap[0]=51;                                      //copy RAM to flash/eeprom
00175                 command_iap[1]=(unsigned int) (location & EE_START_MASK);
00176                 command_iap[2]=(unsigned int) (&ee_buffer[0]);
00177                 command_iap[3]=EE_BUFFER_SIZE;
00178                 command_iap[4]=EE_CCLK;
00179                 iap_entry=(IAP) IAP_LOCATION;
00180                 iap_entry(command_iap,result_iap);
00181 
00182                 command_iap[0]=56;                                      //compare RAM and flash/eeprom
00183                 command_iap[1]=(unsigned int) source;
00184                 command_iap[2]=(unsigned int) location;
00185                 command_iap[3]=EE_REC_SIZE;
00186                 iap_entry=(IAP) IAP_LOCATION;
00187                 iap_entry(command_iap,result_iap);
00188 
00189                 VICIntEnable = enabled_interrupts;  //restore interrupt enable register
00190 
00191                 result_ee[0]=result_iap[0];
00192         }
00193         return;
00194 }
00195 
00196 /************************************************************************/
00197 /*                                                                      */
00198 /* function:                                                                                                                    */
00199 /*  void ee_read(unsigned int command_ee,unsigned int result_ee[])              */
00200 /*                                                                      */
00201 /* type: void                                                           */
00202 /*                                                                      */
00203 /* parameters:                                                                                                                  */
00204 /*      command_ee   - Not used.                                                                                        */
00205 /*  result_ee[0] - Returns a response.                                                                  */
00206 /*                 0 - data successfully found in EEPROM.                               */
00207 /*               500 - no data/records available in EEPROM.                             */
00208 /*  result_ee[1] - an address of the last record of ee_data type                */
00209 /*                                 in EEPROM.                                                   */
00210 /*                                                                      */
00211 /* version: 1.1 (01/27/2006)                                            */
00212 /*                                                                      */
00213 /* constants defined in LPC2k_ee.h used in this function:               */
00214 /*  NO_RECORDS_AVAILABLE - EEPROM is empty/no records identifiable              */
00215 /*                                                 with a record identifier (EE_REC_ID) found   */
00216 /*  EE_ADR_L               - micro's Flash address from where EEPROM begins     */
00217 /*  EE_REC_SIZE            - size (in bytes) of a ee_data structure             */
00218 /*                                                                      */
00219 /* description:                                                                                                                 */
00220 /*  This function scans an EEPROM content looking for the last record   */
00221 /*  that can be identified with a record identifier (EE_REC_ID). When   */
00222 /*  such data is found, its address is passed as result_ee[1].                  */
00223 /*                                                                      */
00224 /* revision history:                                                    */
00225 /* - Rev. 1.0 had problems with accessing the last record in a fully    */
00226 /*   occupied EEPROM. Rev. 1.1 fixes this.                                                              */
00227 /*                                                                      */
00228 /************************************************************************/
00229 void ee_read(unsigned int command_ee,unsigned int result_ee[]){
00230         int location;
00231 
00232         location = ee_locate();
00233         if (location == EE_ADDR_L){
00234                 result_ee[0]=NO_RECORDS_AVAILABLE;
00235         }
00236         else{
00237                 result_ee[0]=0;
00238                 if (location == -1)
00239                         result_ee[1]=(unsigned int)(EE_ADDR_H+1 - EE_REC_SIZE);
00240                 else
00241                         result_ee[1]=(unsigned int)(location - EE_REC_SIZE);
00242         }
00243         return;
00244 }
00245 
00246 /************************************************************************/
00247 /*                                                                      */
00248 /* function:                                                                                                                    */
00249 /*  void ee_readn(unsigned int command_ee,unsigned int result_ee[])             */
00250 /*                                                                      */
00251 /* type: void                                                           */
00252 /*                                                                      */
00253 /* parameters:                                                                                                                  */
00254 /*      command_ee   - An index of a record in EEPROM that should be read.      */
00255 /*  result_ee[0] - Returns a response.                                                                  */
00256 /*                 0 - data successfully found in EEPROM.                               */
00257 /*               502 - requested index of record in EEPROM is out of    */
00258 /*                     EEPROM's memory.                                 */
00259 /*  result_ee[1] - an address of the specified record of ee_data type   */
00260 /*                                 in EEPROM.                                                   */
00261 /*                                                                      */
00262 /* version: 1.0 (initial release 05/13/2005)                            */
00263 /*                                                                      */
00264 /* constants defined in LPC2k_ee.h used in this function:               */
00265 /*  INDEX_OUT_OF_RANGE - index of a record in EEPROM specified by               */
00266 /*                                               command_ee is out of EEPROM's range                    */
00267 /*  EE_ADR_L               - micro's Flash address from where EEPROM begins     */
00268 /*  EE_ADR_H               - micro's Flash address where EEPROM ends            */
00269 /*  EE_REC_SIZE            - size (in bytes) of a ee_data structure             */
00270 /*                                                                      */
00271 /* description:                                                                                                                 */
00272 /*  This function returns in result_ee[1] an address of an EEPROM               */
00273 /*  record index specified in command_ee. Index can not be less than 0. */
00274 /*                                                                      */
00275 /************************************************************************/
00276 void ee_readn(unsigned int command_ee,unsigned int result_ee[]){
00277         if(command_ee>((EE_ADDR_H+1-EE_ADDR_L)/EE_REC_SIZE)){
00278                 result_ee[0]=INDEX_OUT_OF_RANGE;}
00279         else{
00280                 result_ee[0]=0;
00281                 result_ee[1]=(unsigned int)(EE_ADDR_L+EE_REC_SIZE*command_ee);
00282         }
00283         return;
00284 }
00285 
00286 /************************************************************************/
00287 /*                                                                      */
00288 /* function:                                                                                                                    */
00289 /*  void ee_count(unsigned int command_ee,unsigned int result_ee[])             */
00290 /*                                                                      */
00291 /* type: void                                                           */
00292 /*                                                                      */
00293 /* parameters:                                                                                                                  */
00294 /*      command_ee   - Not used.                                                                                        */
00295 /*  result_ee[0] - Returns a response. Always 0.                                                */
00296 /*  result_ee[1] - number of records of ee_data type in EEPROM.                 */
00297 /*                                                                      */
00298 /* version: 1.1 (01/27/2006)                                            */
00299 /*                                                                      */
00300 /* constants defined in LPC2k_ee.h used in this function:               */
00301 /*  EE_ADR_L               - micro's Flash address from where EEPROM begins     */
00302 /*  EE_REC_SIZE            - size (in bytes) of a ee_data structure             */
00303 /*                                                                      */
00304 /* description:                                                                                                                 */
00305 /*  This function returns number of records of ee_data type in EEPROM.  */
00306 /*                                                                      */
00307 /* revision history:                                                    */
00308 /* - Initial release (1.0) was not supplying the right feedback in case */
00309 /*   of counting records in a full EEPROM. Rev. 1.1 fixes this.         */
00310 /*                                                                      */
00311 /************************************************************************/
00312 void ee_count(unsigned int command_ee,unsigned int result_ee[]){
00313         int location;
00314         result_ee[0]=0;
00315         location = ee_locate();
00316         if (location == -1) location = EE_ADDR_H+1;
00317         result_ee[1]=(unsigned int)((location-EE_ADDR_L)/EE_REC_SIZE);
00318         return;
00319 }
00320 
00321 /************************************************************************/
00322 /*                                                                      */
00323 /* function:                                                                                                                    */
00324 /*  void ee_locate()                                                                                                    */
00325 /*                                                                      */
00326 /* type: int                                                            */
00327 /*                                                                      */
00328 /* parameters: none                                                                                                             */
00329 /*                                                                      */
00330 /* version: 1.1 (01/27/2006)                                            */
00331 /*                                                                      */
00332 /* constants defined in LPC2k_ee.h used in this function:               */
00333 /*  EE_ADR_L               - micro's Flash address from where EEPROM begins     */
00334 /*  EE_ADR_H               - micro's Flash address where EEPROM ends            */
00335 /*  EE_REC_ID              - a record indicator used to identify valid data     */
00336 /*  EE_REC_SIZE            - size (in bytes) of a ee_data structure             */
00337 /*                                                                      */
00338 /* description:                                                                                                                 */
00339 /*  This function returns an address as of which new record can be              */
00340 /*      added into Flash/EEPROM. In case of EEPROM being full, function     */
00341 /*  returns -1. Searching is based on divide by two method that         */
00342 /*  provides the fastest processing time.                               */
00343 /*                                                                      */
00344 /* revision history:                                                    */
00345 /* - Rev. 1.1 fixes a bug related to identifying an unused byte of              */
00346 /*   EEPROM in an EEPROM with size not equal to EE_REC_SIZE * 2^k (k>=0)*/
00347 /*                                                                      */
00348 /************************************************************************/
00349 int ee_locate(void){
00350         unsigned int addr_l, addr_m, addr_r, size, slice_limit;
00351         addr_l = EE_ADDR_L;
00352         if ((*((unsigned char *)addr_l))==0xFF) return(addr_l);
00353         addr_r = EE_ADDR_H+1;
00354         if ((*((unsigned char *)(addr_r-EE_REC_SIZE)))==EE_REC_ID) return(-1);
00355         size = addr_r - addr_l;
00356         slice_limit = EE_REC_SIZE - 1;
00357         while(size != EE_REC_SIZE){
00358                 addr_m = (addr_r+addr_l)/2;
00359                 if ((addr_m & slice_limit)!=0x00000000){
00360                         if ((*((unsigned char *)(addr_r - EE_REC_SIZE)))==0xFF) 
00361                                 addr_r = addr_r - EE_REC_SIZE;
00362                         else
00363                                 addr_l = addr_l + EE_REC_SIZE;
00364                         addr_m = (addr_r+addr_l)/2;
00365                         size = size - EE_REC_SIZE;
00366                 }
00367                 if ((*((unsigned char *)addr_m))==0xFF)
00368                         addr_r = addr_m;
00369                 else
00370                         addr_l = addr_m;
00371                 size = size/2;
00372         }
00373         return(addr_r);
00374 }


ccny_asctec_firmware_2
Author(s): Ivan Dryanovski, Roberto G. Valenti
autogenerated on Tue Jan 7 2014 11:04:17