Search found 10 matches

i don't know much about bootloaders but from what i've read, i thought they had to be smaller than 256 words in the 1st part of program memory. can you give me instructions on what i need to do to im ...

do you all think it's possible to bootload via SPI using a hex file stored on an MMC/SD card? i don't think i could store all the code that would read data from the MMC and store it into program spac ...

is it possible to use the SPI of a microcontroller(pic18lf252) to retrieve data from an MMC/SD card and bootload itself?

- i am able to write data to the data area in the MMC in 512 byte blocks.

- i am able to write data to the directory entry table in 32 byte blocks.

- however, i am unsuccessful in writing to the ...

ckielstra - thanks for your response. i already have the spitiming diagram and i already follow the sequence you outline.

i send the read command until i get 00h returned. after that i send the r ...

bump for help guys.

i am having a problem reading a block from MMC. i can successfully RESET, INITialize, and SET_BLOCKLEN.

when i send the command to READ_BLOCK, i never get the FEh start byte. i either get 00h or ...

while using the mmc_spi.c driver file, i couldn't get the code to work.

i just stuck with my own. i am using the PIC18LF252. i am not using pull-up resistors on the sdo or sdi lines. should i be ...

so, you have to use a different command to reset an SD card than you would to reset an MMC card?

i just started looking at the mmc.spi.c driver today. i am not using a voltage divider on the SPI l ...

i am using MMC SPI code to read and write files to MMC. will i be able to use SD interchangeably?

in other words, can i read and write data to the SD without using any of the additional security f ...