SDRAM.rar_LPC2478_LPC2478 sdram_ram_sdram

/*************************************************************************** * See sdram.h for more details **************************************************************************/ #include <stdio.h> #include "board.h" #include "sdram.h" extern Int32U SDRAM_BASE_ADDR; #if SYS_FREQ == (72MHZ) #define SDRAM_PERIOD 13.8 // 72MHz #elif SYS_FREQ == (57MHZ) #define SDRAM_PERIOD 17.4 // 57.6MHz #elif SYS_FREQ == (48MHZ) #define SDRAM_PERIOD 20.8 // 48MHz #elif SYS_FREQ == (36MHZ) #define SDRAM_PERIOD 27.8 // 36MHz #elif SYS_FREQ == (24MHZ) #define SDRAM_PERIOD 41.7 // 24MHz #else #error Frequency not defined #endif #define P2C(Period) (((Period<SDRAM_PERIOD)?0:(Int32U)((Flo32)Period/SDRAM_PERIOD))+1) #define SDRAM_REFRESH 7813 #define SDRAM_TRP 20 #define SDRAM_TRAS 45 #define SDRAM_TAPR 1 #define SDRAM_TDAL 3 #define SDRAM_TWR 3 #define SDRAM_TRC 65 #define SDRAM_TRFC 66 #define SDRAM_TXSR 67 #define SDRAM_TRRD 15 #define SDRAM_TMRD 3 /************************************************************************* * Function Name: SDRAM_Init * Parameters: none * * Return: none * * Description: SDRAM controller and memory init * *************************************************************************/ void SDRAM_Init (void) { // Assign pins to SDRAM controller PINSEL5 &= BIN32(00000000,11111100,11111100,11000000); PINSEL5 |= BIN32(01010101,00000001,00000001,00010101); PINMODE5&= BIN32(00000000,11111100,11111100,11000000); PINMODE5|= BIN32(10101010,00000010,00000010,00101010); PINSEL6 = BIN32(01010101,01010101,01010101,01010101); PINMODE6 = BIN32(10101010,10101010,10101010,10101010); PINSEL7 = BIN32(01010101,01010101,01010101,01010101); PINMODE7 = BIN32(10101010,10101010,10101010,10101010); PINSEL8 &= BIN32(11000000,00000000,00000000,00000000); PINSEL8 |= BIN32(00010101,01010101,01010101,01010101); PINMODE8&= BIN32(11000000,00000000,00000000,00000000); PINMODE8|= BIN32(00101010,10101010,10101010,10101010); PINSEL9 &= BIN32(11111111,11110011,11111111,11111111); PINSEL9 |= BIN32(00000000,00000100,00000000,00000000); PINMODE9&= BIN32(11111111,11110011,11111111,11111111); PINMODE9|= BIN32(00000000,00001000,00000000,00000000); // Init SDRAM controller // Enable EMC clock PCONP_bit.PCEMC = 1; EMCCONTROL = 1; // enable EMC EMCDINAMICRDCFG = 1; EMCDYNAMICRASCAS0_bit.CAS = 3; EMCDYNAMICRASCAS0_bit.RAS = 3; EMCDYNAMICRP = P2C(SDRAM_TRP); EMCDYNAMICRAS = P2C(SDRAM_TRAS); EMCDYNAMICSREX = P2C(SDRAM_TXSR); EMCDYNAMICAPR = SDRAM_TAPR; EMCDYNAMICDAL = SDRAM_TDAL+P2C(SDRAM_TRP); EMCDYNAMICWR = SDRAM_TWR; EMCDYNAMICRC = P2C(SDRAM_TRC); EMCDYNAMICRFC = P2C(SDRAM_TRFC); EMCDYNAMICXSR = P2C(SDRAM_TXSR); EMCDYNAMICRRD = P2C(SDRAM_TRRD); EMCDYNAMICMRD = SDRAM_TMRD; EMCDYNAMICCFG0 = 0x0004680; // 13 row, 9 - col, SDRAM // JEDEC General SDRAM Initialization Sequence // DELAY to allow power and clocks to stabilize ~100 us // NOP EMCDINAMICCTRL = 0x0183; for(volatile Int32U i = 200*30; i;i--); // PALL EMCDINAMICCTRL_bit.I = 2; EMCDINAMICRFR = 1; for(volatile Int32U i= 128; i; --i); // > 128 clk EMCDINAMICRFR = P2C(SDRAM_REFRESH) >> 4; // COMM EMCDINAMICCTRL_bit.I = 1; // Burst 4, Sequential, CAS-3 volatile unsigned long Dummy = *(volatile unsigned short *) ((Int32U)&SDRAM_BASE_ADDR + (0x32UL << (13))); // NORM EMCDINAMICCTRL = 0x0000; EMCDYNAMICCFG0_bit.B = 1; for(volatile Int32U i = 10000; i;i--); } Boolean SDRAM_Test (void) { // 32 bits access for (Int32U i = 0; i < 0x4000000; i+=sizeof(Int32U)) { *(Int32U*)(((Int32U)&SDRAM_BASE_ADDR)+i) = i; } for (Int32U i = 0; i < 0x4000000; i+=sizeof(Int32U)) { if (*(Int32U*)(((Int32U)&SDRAM_BASE_ADDR)+i) != i) { printf("Verification error on address : 0x%x\n",(Int32U)&SDRAM_BASE_ADDR+i); return(FALSE); } } // 16 bits access for (Int32U i = 0; i < 0x10000; i+=sizeof(Int16U)) { *(Int16U*)((Int32U)&SDRAM_BASE_ADDR+i) = i; } for (Int32U i = 0; i < 0x10000; i+=sizeof(Int16U)) { if (*(Int16U*)((Int32U)&SDRAM_BASE_ADDR+i) != i) { printf("Verification error on address : 0x%x\n",(Int32U)&SDRAM_BASE_ADDR+i); return(FALSE); } } // 8 bits access for (Int32U i = 0; i < 0x100; i+=sizeof(Int8U)) { *(Int8U*)((Int32U)&SDRAM_BASE_ADDR+i) = i; } for (Int32U i = 0; i < 0x100; i+=sizeof(Int8U)) { if (*(Int8U*)((Int32U)&SDRAM_BASE_ADDR+i) != i) { printf("Verification error on address : 0x%x\n",(Int32U)&SDRAM_BASE_ADDR+i); return(FALSE); } } return(TRUE); }