This adds a test program which can be loaded and executed by the host.
It simply returns a value in the `a` register.
The linker script is modified so that it will output an o65 file, and
the memory sgments are changed as well. There is no STARTUP segment
defined, so it uses the default `none` crt0, which sets up the stack
and does initialization and deconstruction.
The Makefile is modified to not turn the output into an intel hex file,
and instead keep it as the o65 file.
Prints out information about the drive, now inside its own function.
Also changes the read function to take in a 32 bit address instead of a
16 bit one.
Attempts to read the first file on the disk
Polls the sd controller until the read flag is set, at which point it
reads 32 bits of data from the controller.
long response codes (such as CID) are not supported in hw or sw.
These series of commands are enough to read the first 512b block off of
the sd card. The RCA is hard coded to the sd card that I have on hand,
since response codes are not supported
This code creates a shared mapping in high ram, makes sure that that
works, and also makes sure that the memory which is mapped over is left
unchanged.
Replace RAM section with SDRAM.
Really this makes no difference than before we added SDRAM except the
name is different. In hardware, the SDRAM acts the same way and is
located in the same space as the RAM was previously.
Currently an interrupt is triggered any time there is any activity on
the UART_RXD line, but later it will only trigger once there is data
ready to be read.
Fixed bug where we forgot to restore x in _hex_set_8 if the idx check
fails. We did remember to restore it if the check passed.
Fixed bug where _hex_set_24 did not return 0.
This only includes the method to set the pairs of displays individually.
The functions to write a single 16 or 32 bit value have not been
implemented yet, nor has the mask function.
Adds the usb code that we got in ECE 385. It will not work now, and
parts that involve the timer are disabled. It does compile though, with
a few warnings.
The goal will be to add USB MSD support, which is not actually given to
us so I will have to do myself or find some other code to base it off
of.
Since the goal is to have the MAX3421E working, which uses multiple 8
bit transfers, we should support multiple 8 bit transfers instead of
trying to use 16 bit transfers.
When using spi_byte(), the device is automatically selected. After you
have made as many transfers as you want, you must deselect the device
with spi_deselect().
