Code ASM - [expand] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 ;****************************************************************** ; To initialize the SD/SDHC card in SPI mode ;****************************************************************** SPCR DATA 0D5H SPSR DATA 0AAH SPDR DATA 086H SS BIT P1.4 MOSI BIT P1.5 MISO BIT P1.6 SCK BIT P1.7 ORG 00H SJMP MAIN ORG 30H MAIN: MOV 30H,#00 ;indication LCALL DELAY ;to ready the hardware LCALL RESET LCALL SPI_DELAY LCALL SPI_MODE LCALL RESPONSE SJMP $ ;-----------------------------------------------------------------------------; ;------------------- SPI MODE-------------------------------------------------; ;-----------------------------------------------------------------------------; SPI_MODE: CLR SS ;LCALL SPI_DELAY1 CLR A MOV A,#40H ;6TH BYTE LCALL SPI_WRITE CLR A MOV A,#00H ;5TH BYTE LCALL SPI_WRITE CLR A MOV A,#00H LCALL SPI_WRITE ;4TH BYTE CLR A MOV A,#00H LCALL SPI_WRITE ;3RD BYTE CLR A MOV A,#00H LCALL SPI_WRITE ;2ND BYTE CLR A MOV A,#95H LCALL SPI_WRITE ;1ST BYTE RET ;CLR A ;-----------------------------------------------------------------------------; ;--------------------RESPONSE-------------------------------------------------; ;-----------------------------------------------------------------------------; RESPONSE: CLR A MOV A,#0FFH LCALL SPI_WRITE CJNE A,#01H,AGAIN CLR P2.0 SETB SS RET AGAIN: CLR A MOV A,#0FFH LCALL SPI_WRITE CJNE A,#01H,AGAIN2 CLR P2.0 SETB SS RET AGAIN2: CLR A MOV A,#0FFH LCALL SPI_WRITE CJNE A,#01H,AGAIN3 CLR P2.0 SETB SS RET AGAIN3: CLR A MOV A,#0FFH LCALL SPI_WRITE CJNE A,#01H,AGAIN4 CLR P2.0 SETB SS RET AGAIN4: CLR A MOV A,#0FFH LCALL SPI_WRITE CJNE A,#01H,AGAIN5 CLR P2.0 SETB SS RET AGAIN5: CLR A MOV A,#0FFH LCALL SPI_WRITE CJNE A,#01H,AGAIN6 CLR P2.0 SETB SS RET AGAIN6: CLR A MOV A,#0FFH LCALL SPI_WRITE CJNE A,#01H,AGAIN7 CLR P2.0 SETB SS RET AGAIN7: CLR A MOV A,#0FFH LCALL SPI_WRITE CJNE A,#01H,AGAIN8 CLR P2.0 SETB SS RET ;SETB SS ;RET ;-------------------------------------------------------------------- AGAIN8: ;---------------------------------------------------------------------- CLR A MOV A,#40H ;6TH BYTE LCALL SPI_WRITE CLR A MOV A,#00H ;5TH BYTE LCALL SPI_WRITE CLR A MOV A,#00H LCALL SPI_WRITE ;4TH BYTE CLR A MOV A,#00H LCALL SPI_WRITE ;3RD BYTE CLR A MOV A,#00H LCALL SPI_WRITE ;2ND BYTE CLR A MOV A,#95H LCALL SPI_WRITE ;1ST BYTE LJMP RESPONSE ;-----------------------------------------------------------------------------; ;-------------------RESET SPI CHANNEL-----------------------------------------; ;-----------------------------------------------------------------------------; RESET: SETB SS SETB MOSI SETB MISO ;SETB SCK CLR SCK MOV SPCR,#52H ;ENABLES THE SPI CHANNEL,,,,,5CH ;disable interrupt,MSB first,master mode ;mode 1,1;fosc/64 MOV SPSR,#00H RET ;-----------------------------------------------------------------------------; ;-------------- WRITING DATA THROUGH SPI PROTOCOL-----------------------------; ;-----------------------------------------------------------------------------; SPI_WRITE: ;CLR SS MOV SPDR,A ;DATA TO BE TRANSMITTED SHOULD BE LOADED IN DATA REGISTER SPI_LOOP: CLR A MOV A,SPSR ;GET THE STATUS ANL A,#80H ;TO CHECK THE SPIF FLAG (TRANSMIT OVER) JZ SPI_LOOP MOV A,SPDR clr p1.0 ;indication RET ;-----------------------------------------------------------------------------; ;-------------- WRITING DATA THROUGH SPI PROTOCOL-----------------------------; ;-----------------------------------------------------------------------------; SPI_RECEIVE: CLR A MOV A,#0FFH MOV SPDR,A ;DATA TO BE TRANSMITTED SHOULD BE LOADED IN DATA REGISTER LCALL SPI_WRITE RET ;-----------------------------------------------------------------------------; ;-----------------------------------------------------------------------------; DELAY: MOV 30H,#255 HERE1: MOV 31H,#255 HERE: MOV 32H,#8 DJNZ 32H,$ DJNZ 31H,HERE DJNZ 30H,HERE1 RET ;-----------------------------------------------------------------------------; ;-----------------------------------------------------------------------------; SPI_DELAY: MOV 30H,#10 HERE2: CLR A MOV A,#0FFH LCALL SPI_WRITE DJNZ 30H,HERE2 RET END
Yes, I know. This is how it should be.If the command you sent was successfully received, then you will receive the message (00000001)2.
??? You are driving the SPI lines through the dedicated SPI interface. As long as the SPI interface is activated, the port control register don't have any effect. You can only drive MOSI high by writing 0xFF to SPDR.If you are telling about MOSI line then it is already define that "setb mosi" before toggling SD CLK.
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