fake version of printk: just call printf.

should have a way to flush all output from the pi. right now we just delay, but this is not perfect and, also, gross. viva la cs140e!

called first to setup uart to 8n1 115200 baud, no interrupts. - you will need memory barriers, use <dev_barrier()> later: should add an init that ta

do you really want to expose all of this stuff?

read byte from <l>

All the paths I see are relative to the root of the mounted filesystem. In order to get to the underlying filesystem, I need to have the mountpoint.

* inline these so they can be used when we bit-bang off the UART with no interrupts. */

put one byte on the tx qqueue, if needed, blocks until TX has space.

semantics: match a single line of text: ends with a \r\n

non-destructively gets the next character in the input stream.

uclibc: Append SRC on the end of DEST. */

slightly different semantics: we match prefix (other than blank spaces), but reject if it is a substring of a longer token. for example: "var" would n

send the unix side an error code and reboot.

set <pin> to be an output pin. note: fsel0, fsel1, fsel2 are contiguous in memory, so you can use array calculations!

* Return a memory block of at least size <nbytes> * Notes: * - There is no free, so is trivial: should be just * a few lines of code. * - Th

initialize global interrupt state.

write value <v> to GPIO <pin>: return when <ncycles> have passed since time <start>

set GPIO <pin> off

just delay using your laptop methods.

* One-time initialization, called before kmalloc * to setup heap. * - should be just a few lines of code. * - sets heap pointer to the loca

create a mapping for <va> to <pa> in the page table <pt> for now: - assume domain = 0. - global mapping - executable - don't use APX - TEX,A,B: for to

attempt to open tty <device>, retries some number of times if fails. otherwise panics.

called from user space.

set <pin> to <v> (v \in {0,1})

address of returned pointer should be a multiple of alignment.

cut this out.

echo the current line out, printing <msg>

sleep for <usec> microseconds.

return the value of <pin>

set <pin> to input.

set GPIO <pin> on.

if not blank, removes no characters.

slightly different semantics: we match prefix (other than blank spaces), but reject if it is a substring of a longer token. for example: "var" would n

read entire file into buffer. return it. zero pads to a multiple of 4. make sure to cleanup!

create a new thread.

no dev barrier.

non-blocking push.

find the TTY-usb device (if any) by using <scandir> to search for a device with a prefix given by <ttyusb_prefixes> in /dev returns: - device name. pa

p98: detect falling edge (1->0). sampled using the system clock. similarly to rising edge detection, it suppresses noise by looking for "100" --- i.e

p97 set to detect rising edge (0->1) on <pin>. as the broadcom doc states, it detects by sampling based on the clock. it looks for "011" (low, hi, hi

used for debugging: print what we have. helps figure out what when wrong by comparing to what we expected.

current number of tokens in stream.

get a single character.

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