applet.interface.i2c_master: add "scan" command #166
Conversation
|
Should we maybe have a single |
|
would also be an option. I'm indifferent, both ways are a reasonable interface IMO. |
|
Let's do that instead. Would you adjust the PR please? |
|
will do |
electroniceel
force-pushed
the
i2c-scan
branch
from
b150081 to
a1ab8c3
Compare
|
|
||
| p_scan.add_argument( | ||
| "--readwrite", "-rw", action="store_true", default=False, | ||
| help="scan read and write addresses") |
There was a problem hiding this comment.
Wouldn't the combination of -r and -w already work as -rw with no additional effort? Or does argparse not provide that?
There was a problem hiding this comment.
oh, you are right. I didn't give argparse enough credit, it can do it.
Will fix it in the next rev.
| @@ -233,6 +233,24 @@ def __init__(self, interface, logger): | |||
| revision = device_id[2] & 0x7 | |||
| return (manufacturer, part_ident, revision) | |||
|
|
|||
| async def scan(self, read_addrs=True, write_addrs=True): | |||
There was a problem hiding this comment.
You should mark any boolean flags as keyword-only arguments, like async def scan(self, *, read_addrs=True, write_addrs=True):. (I should add a CONTRIBUTING.md file that explains these things...)
There was a problem hiding this comment.
You are right, I wasn't thinking pythonic enough. Will fix that in the next rev.
…mands with "scan" "-r", "-w" and "-rw" allow to select which type of addresses to scan. "-rw" is the default. Some devices only ACK one of the addresses, so scanning both gives a better overview of the bus.
…sterInterface Allows to use it from other applets or the repl interface
electroniceel
force-pushed
the
i2c-scan
branch
from
a1ab8c3 to
a7a5bf1
Compare
|
Thanks! |
|
Do you think side effects are more likely with read scanning than write scanning? |
|
In case of read scanning you're reading one byte, in case of write scanning you're aborting the transaction after the address, which is why I thought it's more likely. |
|
I remember reading a datasheet where the interrupt line was reset when reading out the irq register or something like that. That would match your line of thought. |
|
Let's. |
|
grmpf. additions to a branch aren't possible in github once it's merged. |
"scan" scans for i2c devices on read and write addresses in one go.
Some devices only ACK one of the addresses, so scanning both gives
a better overview of the bus. With this command you don't need to
do a "scan-read" and then a "scan-write" to get the result.