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rust-raspberrypi-OS-tutorials/.0B_readsector
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Andre Richter e6ab38f228 Hide tuts not implemented in Rust yet 6 years ago
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Makefile Hide tuts not implemented in Rust yet 6 years ago
OLVASSEL.md Hide tuts not implemented in Rust yet 6 years ago
README.md Hide tuts not implemented in Rust yet 6 years ago
delays.c Hide tuts not implemented in Rust yet 6 years ago
delays.h Hide tuts not implemented in Rust yet 6 years ago
gpio.h Hide tuts not implemented in Rust yet 6 years ago
kernel8.img Hide tuts not implemented in Rust yet 6 years ago
link.ld Hide tuts not implemented in Rust yet 6 years ago
main.c Hide tuts not implemented in Rust yet 6 years ago
mbox.c Hide tuts not implemented in Rust yet 6 years ago
mbox.h Hide tuts not implemented in Rust yet 6 years ago
sd.c Hide tuts not implemented in Rust yet 6 years ago
sd.h Hide tuts not implemented in Rust yet 6 years ago
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uart.h Hide tuts not implemented in Rust yet 6 years ago

README.md

Tutorial 0B - Read Sector

So far we have linked our data (pixmap, font) to the kernel image. It is time to read data from the SD card. For this tutorial we're implementing a real driver for read sector function.

Sd.h, sd.c

Well, it would be nice to have a mailbox for reading and writing sectors, but there isn't. So we have to talk directly to the EMMC, which is tricky and boring. We have to handle all kinds of cards. But finally, we have two function.

sd_init() initialize EMMC for SD card read.

sd_readblock(lba,buffer,num) read num blocks (sectors) from the SD card into buffer starting at sector lba.

Main

We read a block after the bss segment in memory, and then we dump it to the console. The read function will display detailed information on the EMMC communication.