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PROYECTOS : AUX MMC Card |
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Circuito auxiliar para Leer y escribir tarjetas MMC (MultiMedia Card) |
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| Descripción: |
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| Circuito: |
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| Circuito Impreso: |
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| Implementación
provisional para pruebas: |
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| Firmware inicial para
pruebas: |
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#define MMC_CS PIN_B3 #define MMC_CLK PIN_B2 #define MMC_DI PIN_B0 #define MMC_DO PIN_B1 |
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////////////////////// Driver for
Multimedia Card /////////////////////// //// //// //// mmc_init() - Reset and Initialize the MMC. Returns zero if OK //// //// //// //// mmc_modify_byte(address, val) - Modify the byte at address to //// //// change it's value to val. Will read/write the //// //// entire 512 byte block but only change this //// //// specific byte. Returns zero if OK. //// //// //// //// mmc_modify_block(address, size, *ptr) - Modifies the bytes //// //// to change their value to whats stored at *ptr. //// //// Will read/write the entire 512 byte block(s) but //// //// only change the values defined by ptr and size. //// //// Returns zero if OK. //// //// //// //// mmc_write_block(address, size, *ptr) - Writes a 512 byte //// //// block to the MMC. If size is less than 512 then //// //// unspecified data will be written as 0. Returns //// //// zero if OK. //// //// //// //// mmc_read_byte(address,*ptr) - Reads the byte specified at //// //// address. Result is saved to ptr. Returns zero //// //// if OK. //// //// //// //// mmc_read_block(address, size, *ptr) - Reads the bytes //// //// specified at address. Result is saved to ptr. //// //// Returns zero if OK. //// //// NOTE: You might get an address error if you try //// //// to read over a page size. For example, trying //// //// to read a block size of 512 starting at address //// //// 0x100 may cause an error because you are reading //// //// two blocks. //// //// //// //// mmc_erase(address, blocks) - Erases the block specified at //// //// address. Will erase the entire 512 byte block. //// //// If you wish to erase more blocks after specified //// //// block use the blocks parameter to specifiy how //// //// many extra blocks to erase. Returns zero if OK. //// //// //// //// ~~~~~~~ MULTI-READ FUNCTIONS ~~~~~~~~ //// //// //// //// mmc_read_enable(address, size) - Start multi-reads at //// //// specified address. Size is the size of each //// //// individual read. Returns zero if OK. //// //// //// //// mmc_read_mult_block(*ptr) - Reads data from the MMC, and saves //// //// to ptr. The number of bytes read is defined //// //// by mmc_read_enable(). You must call //// //// mmc_read_enable() before you can call this. //// //// Returns zero if OK. //// //// //// //// mmc_read_disable(void) - Stop a multi-read. //// //// Returns zero if OK. //// //// MAY BE BROKEN. //// //// //// ///////////////////////////////////////////////////////////////////////// //// (C) Copyright 1996,2001 Custom Computer Services //// //// This source code may only be used by licensed users of the CCS //// //// C compiler. This source code may only be distributed to other //// //// licensed users of the CCS C compiler. No other use, //// //// reproduction or distribution is permitted without written //// //// permission. Derivative programs created using this software //// //// in object code form are not restricted in any way. //// ///////////////////////////////////////////////////////////////////////// |
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//////////////////////////////////////////////////////////////////////////////////// // // MMC Card Test ... // by RedPic //////////////////////////////////////////////////////////////////////////////////// #include <18f2550.h> #fuses HS,MCLR,NOWDT,NOPROTECT,NOPUT,NOBROWNOUT,NOPBADEN,NOLVP,NOCPD,NODEBUG,NOWRT,NOVREGEN #use delay(clock=20000000) #define EM202_MD PIN_A0 #define EM202_RST PIN_A1 #define EM202_CTS PIN_A2 #define EM202_RTS PIN_A3 #define EM202_DTR PIN_A4 #define EM202_DSR PIN_A5 #define EM202_RX PIN_C6 #define EM202_TX PIN_C7 #define LED PIN_C0 #define BUZZER PIN_C1 #define RELE PIN_C2 #use rs232(baud=19200, xmit=EM202_RX, rcv=EM202_TX) char cRec=0x00; // Último caracter recibido via serie char Command=0x00; // Comando a procesar int8 MMCBuffer[512]; int32 address=0; #define MMC_CS PIN_B3 #define MMC_CLK PIN_B2 #define MMC_DI PIN_B0 #define MMC_DO PIN_B1 #include "rr_mmc_spi.c" //////////////////////////////////////////////////////////////////////////////////// // // Funciones ... // //////////////////////////////////////////////////////////////////////////////////// void Cursor(char c){ printf("%c\r\n>",c); } void Presenta_Hardware(void){ printf("\r\n\n"); printf("MMC MultiMedia Card Driver Test\r\n"); printf("Hardware iACCESS CONTROL V1 v.0.0.0\r\n\n"); printf("Commands when available:\r\n\n"); printf("[X] Reset EM202 Ethernet Module\r\n"); printf("[M] Init MMC Card\r\n"); printf("[F] Read MMC Card Block First\r\n"); printf("[R] Read MMC Card Block Actual\r\n"); printf("[ ] Read MMC Card Block Next\r\n\n"); Cursor(0x00); } void Reset_EM202(void){ OUTPUT_HIGH(EM202_MD); OUTPUT_HIGH(EM202_RST); delay_ms(110); OUTPUT_LOW(EM202_RST); delay_ms(110); } //////////////////////////////////////////////////////////////////////////////////// // // Interrupción por Recepción Serie RS232 // //////////////////////////////////////////////////////////////////////////////////// #int_rda void handle_rda_int(){ if(kbhit()){ // Si hay algo pdte de recibir ... cRec=getc(); // lo recibo sobre cRec ... if(cRec!=0x00){ // Si es distinto de \0 ... Command=ToUpper(cRec); // cargo cRec sobre Command para procesarlo } // pasándolo a Mayúsculas para no confundir. } } //////////////////////////////////////////////////////////////////////////////////// // // Main // //////////////////////////////////////////////////////////////////////////////////// void main() { int16 f=0; int16 size=512; int8 col=0; disable_interrupts(global); disable_interrupts(int_timer1); disable_interrupts(int_rda); disable_interrupts(int_ext); disable_interrupts(int_ext1); disable_interrupts(int_ext2); setup_adc_ports(NO_ANALOGS); setup_adc(ADC_OFF); setup_spi(FALSE); setup_counters(RTCC_INTERNAL,RTCC_DIV_2); setup_timer_0(RTCC_OFF); setup_timer_1(T1_INTERNAL | T1_DIV_BY_1); setup_timer_2(T2_DISABLED,0,1); setup_timer_3(T3_DISABLED); setup_comparator(NC_NC_NC_NC); setup_vref(FALSE); port_b_pullups(false); set_tris_a(0b00001000); set_tris_c(0b10000000); enable_interrupts(global); enable_interrupts(int_rda); Reset_EM202(); address=0; do { if(Command!=0x00){ // Si he recibido un comando vía Serie ... if(Command=='?'){ // Si el comando es '?' ... Presenta_Hardware(); } if(Command=='X'){ // Reset EM202 Cursor(Command); Reset_EM202(); } if(Command=='M'){ // Inicializa MMC Card Cursor(Command); if(mmc_init()==0) printf("MMC init ok"); else printf("MMC init fault"); Cursor(0x00); } if(Command=='F'){ // Read First Block MMC Card address=0; Command='R'; } if(Command==' '){ // Read Next Block MMC Card address+=512; Command='R'; } if(Command=='R'){ // Read Block MMC Card Cursor(Command); for(f=0;f<=511;f++) MMCBuffer[f]=0; size=511; col=0; if(mmc_read_block(address, size,&MMCBuffer[0])==0){ printf("\r\n>MMC read ok from Address %LX to %LX\r\n",address,address+size); for(f=0;f<=511;f++){ printf("%X ",MMCBuffer[f]); if(++col==16){ col=0; printf("\r\n"); } } } else printf("\n\rread fault"); Cursor(0x00); } Command=0x00; // Indico que ya he procesado el comando. } } while (TRUE); } |
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Esta página se modificó el 27/12/2008
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