Coach: como estas, mira te cuento que logre iniciar la memoria con elo SPI por hardware con el codigo tal cual como se baja de microchipc, el problea que tengo ahora es que el compilador no me compila esta parte del codigo
SPI_WRITE(HIGH(varh));
que es ese HIGH() ? esa parte de codigo es de la escritura de bloques de datos y de la lectura, tuve que ponerla como comentario para que me compile y uso solo la parte de inicializacion, vos pudiste compilar? Saludos
#include <16f877a.h>
#fuses XT,NOWDT,NOPROTECT,NOLVP,PUT,BROWNOUT
#use delay(clock=4000000)
#use standard_io(b)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
char Keypress=" ";
int mmc_init();
int mmc_response(unsigned char response);
int mmc_read_block(unsigned long block_number);
int mmc_write_block(unsigned long block_number);
int mmc_get_status();
#int_rda
void rda_isr() {
Keypress=0x00;
if(kbhit()){
Keypress=getc();
}
}
/************************** MMC Init **************************************/
/* Initialises the MMC into SPI mode and sets block size, returns 0 on success */
int mmc_init()
{
int i;
SETUP_SPI(SPI_MASTER | SPI_H_TO_L | SPI_CLK_DIV_4 | SPI_SS_DISABLED);
*0x94 |= 0x40; // set CKE = 1 - clock idle low
*0x14 &= 0xEF; // set CKP = 0 - data valid on rising edge
OUTPUT_HIGH(PIN_C2); // set SS = 1 (off)
for(i=0;i<10;i++) // initialise the MMC card into SPI mode by sending clks on
{
SPI_WRITE(0xFF);
}
OUTPUT_LOW(PIN_C2); // set SS = 0 (on) tells card to go to spi mode when it receives reset
SPI_WRITE(0x40); // send reset command
SPI_WRITE(0x00); // all the arguments are 0x00 for the reset command
SPI_WRITE(0x00);
SPI_WRITE(0x00);
SPI_WRITE(0x00);
SPI_WRITE(0x95); // precalculated checksum as we are still in MMC mode
puts("Sent go to SPI
"
;
if(mmc_response(0x01)==1) return 1; // if = 1 then there was a timeout waiting for 0x01 from the mmc
puts("Got response from MMC
"
;
i = 0;
while((i < 255) && (mmc_response(0x00)==1)) // must keep sending command if response
{
SPI_WRITE(0x41); // send mmc command one to bring out of idle state
SPI_WRITE(0x00); // all the arguments are 0x00 for command one
SPI_WRITE(0x00);
SPI_WRITE(0x00);
SPI_WRITE(0x00);
SPI_WRITE(0x01); // checksum is no longer required but we always send 0xFF
i++;
}
if(i >= 254) return 1; // if >= 254 then there was a timeout waiting for 0x00 from the mmc
puts("Got out of idle response from MMC
"
;
OUTPUT_HIGH(PIN_C2); // set SS = 1 (off)
SPI_WRITE(0xFF); // extra clocks to allow mmc to finish off what it is doing
OUTPUT_LOW(PIN_C2); // set SS = 0 (on)
SPI_WRITE(0x50); // send mmc command one to bring out of idle state
SPI_WRITE(0x00);
SPI_WRITE(0x00);
SPI_WRITE(0x02); // high block length bits - 512 bytes
SPI_WRITE(0x00); // low block length bits
SPI_WRITE(0xFF); // checksum is no longer required but we always send 0xFF
if((mmc_response(0x00))==1) return 1;
OUTPUT_HIGH(PIN_C2); // set SS = 1 (off)
puts("Got set block length response from MMC
"
;
puts("Memoria inicializada!!! uijaaa !!
"
;
return 0;
}
/************************** MMC Get Status **************************************/
/* Get the status register of the MMC, for debugging purposes */
int mmc_get_status()
{
OUTPUT_LOW(PIN_C2); // set SS = 0 (on)
SPI_WRITE(0x58); // send mmc command one to bring out of idle state
SPI_WRITE(0x00);
SPI_WRITE(0x00);
SPI_WRITE(0x00); //
SPI_WRITE(0x00); // always zero as mulitples of 512
SPI_WRITE(0xFF); // checksum is no longer required but we always send 0xFF
OUTPUT_HIGH(PIN_C2); // set SS = 1 (off)
return 0;
}
/************************** MMC Write Block **************************************/
int mmc_write_block(unsigned long block_number)
{
unsigned long i;
unsigned long varh,varl;
varl=((block_number&0x003F)<<9);
varh=((block_number&0xFFC0)>>7);
puts("Write block
"
; // block size has been set in mmc_init()
OUTPUT_LOW(PIN_C2); // set SS = 0 (on)
/*SPI_WRITE(0x58); // send mmc write block
SPI_WRITE(HIGH(varh));
SPI_WRITE(LOW(varh));
SPI_WRITE(HIGH(varl));
SPI_WRITE(0x00); // always zero as mulitples of 512
SPI_WRITE(0xFF); // checksum is no longer required but we always send 0xFF
if((mmc_response(0x00))==1) return 1;
puts("Got response to write block
"
;
SPI_WRITE(0xFE); // send data token
for(i=0;i<512;i++)
{
SPI_WRITE(i2c_eeprom_read(HIGH(i),LOW(i))); // send data
}
SPI_WRITE(0xFF); // dummy CRC
SPI_WRITE(0xFF);
if((SPI_READ(0xFF)&0x0F)!=0x05) return 1;
puts("Got data response to write block
"
;
OUTPUT_HIGH(PIN_C2); */ // set SS = 1 (off)
return 0;
}
/************************** MMC Read Block **************************************/
/**** Reads a 512 Byte block from the MMC and outputs each byte to RS232 ****/
int mmc_read_block(unsigned long block_number)
{
unsigned long i;
unsigned long varh,varl;
varl=((block_number&0x003F)<<9);
varh=((block_number&0xFFC0)>>7);/*
OUTPUT_LOW(PIN_C2); // set SS = 0 (on)
SPI_WRITE(0x51); // send mmc read single block command
SPI_WRITE(HIGH(varh)); // arguments are address
SPI_WRITE(LOW(varh));
SPI_WRITE(HIGH(varl));
SPI_WRITE(0x00);
SPI_WRITE(0xFF); // checksum is no longer required but we always send 0xFF
if((mmc_response(0x00))==1) return 1; // if mmc_response returns 1 then we failed to get a 0x00 response (affirmative)
puts("Got response to read block command
"
;
if((mmc_response(0xFE))==1) return 1; // wait for data token
puts("Got data token
"
;
for(i=0;i<512;i++)
{
putc(SPI_READ(0xFF)); // we should now receive 512 bytes
}
SPI_READ(0xFF); // CRC bytes that are not needed
SPI_READ(0xFF);
OUTPUT_HIGH(PIN_C2); // set SS = 1 (off)
SPI_WRITE(0xFF); // give mmc the clocks it needs to finish off
puts("
End of read block
"
;*/
return 0;
}
/************************** MMC get response **************************************/
/**** Repeatedly reads the MMC until we get the response we want or timeout ****/
int mmc_response(unsigned char response)
{
unsigned long count = 0xFFFF; // 16bit repeat, it may be possible to shrink this to 8 bit but there is not much point
while(SPI_READ(0xFF) != response && --count > 0);
if(count==0) return 1; // loop was exited due to timeout
else return 0; // loop was exited before timeout
}
void main()
{
setup_adc(ADC_CLOCK_INTERNAL);
setup_adc_ports(RA0_RA1_ANALOG_RA3_REF);
output_low(PIN_B5);
enable_interrupts(int_rda);
enable_interrupts(global);
printf("
UTN - Facultad Regional Parana
" );
printf("
Tecnicas Digitales I
" );
printf("
Aprete i para inicializar
" );
do {
if(Keypress!=0x00)
{
switch(Keypress)
{
case "i": if (mmc_init()==0)
printf("
Arranco la memoria
" );
else printf("
No anda la puta madre!
" );
break;
case "0": output_low(PIN_B5);
printf(" 0 - LED Apagado
" );
break;
case "1": output_high(PIN_B5);
printf(" 1 - LED Encendido
" );
break;
}
Keypress=0x00;
}
} while (TRUE);
}