suspect-devices/circuitpython/extmod/machine_i2c.c, branch 5.1.x

protocols: Allow them to be (optionally) type-safe

2019-12-04T15:29:57+00:00

Protocols are nice, but there is no way for C code to verify whether a type's "protocol" structure actually implements some particular protocol. As a result, you can pass an object that implements the "vfs" protocol to one that expects the "stream" protocol, and the opposite of awesomeness ensues. This patch adds an OPTIONAL (but enabled by default) protocol identifier as the first member of any protocol structure. This identifier is simply a unique QSTR chosen by the protocol designer and used by each protocol implementer. When checking for protocol support, instead of just checking whether the object's type has a non-NULL protocol field, use `mp_proto_get` which implements the protocol check when possible. The existing protocols are now named: protocol_framebuf protocol_i2c protocol_pin protocol_stream protocol_spi protocol_vfs (most of these are unused in CP and are just inherited from MP; vfs and stream are definitely used though) I did not find any crashing examples, but here's one to give a flavor of what is improved, using `micropython_coverage`. Before the change, the vfs "ioctl" protocol is invoked, and the result is not intelligible as json (but it could have resulted in a hard fault, potentially): >>> import uos, ujson >>> u = uos.VfsPosix('/tmp') >>> ujson.load(u) Traceback (most recent call last): File "", line 1, in ValueError: syntax error in JSON After the change, the vfs object is correctly detected as not supporting the stream protocol: >>> ujson.load(p) Traceback (most recent call last): File "", line 1, in OSError: stream operation not supported

Fix unix build

2019-01-18T20:52:27+00:00

Fix esp and samd

2018-08-17T00:41:35+00:00

all: Convert remaining "mp_uint_t n_args" to "size_t n_args".

2017-08-30T00:59:58+00:00

This is to have consistency across the whole repository.

extmod/machine_i2c: Add hook to constructor to call port-specific code.

2016-11-23T13:12:51+00:00

If MICROPY_PY_MACHINE_I2C_MAKE_NEW is defined then it is called when an I2C object is constructed with an id which is not -1.

extmod/machine_i2c: Expose soft I2C obj and readfrom/writeto funcs.

2016-11-23T13:11:45+00:00

For external use by ports if needed.

extmod/machine_i2c: Remove trivial function wrappers.

2016-11-23T06:05:38+00:00

extmod/machine_i2c: Add 'stop' argument to i2c readfrom/writeto meths.

2016-11-23T06:05:38+00:00

extmod/machine_i2c: Make i2c.write[to] methods return num of ACKs recvd.

2016-11-23T06:05:38+00:00

extmod/machine_i2c: Add 'nack' argument to i2c.readinto.

2016-11-23T06:05:38+00:00