connect_assert_srst is used to enforce a CPU reset before connecting to
it with openocd. This is useful when debugging on-chip.
For details on openocd reset configuration, see
- Fixed documentation
- Use bitwise operation instead of multiplication and addition in `GPIO_PIN()`
- Allow GPIOs to be configured as input via `gpio_init()`
- Fixed bugs in `gpio_init_mux`:
- `0x01 << ((pin & 31) * 2)` was used before to generate the bitmask, but
this would shift by 62 to the left. Correct is `0x01 << ((pin & 15) * 2)`
(See [datasheet](https://www.nxp.com/docs/en/user-guide/UM10211.pdf) at
pages 156ff)
- Only one of the two bits was cleared previously
- Changed strategy to access GPIO pins:
- Previous strategy:
- Set all bits in FIOMASK except the one for the pin to control to
disable access to them
- Set/clear/read all pins in the target GPIO port (but access to all but
the target pin is ignored because of the applied FIOMASK)
- New strategy:
- Set/clear/read only the target pin
- Advantages:
- Only one access to a GPIO register instead of two
- Proven approach: Access to GPIOs on lpc2387 is mostly done by
accessing the GPIO registers directy (e.g. see the sht11 driver).
Those accesses never touch the FIOMASK register
- No unwanted side effects: Disabling all but one pin in a GPIO port
without undoing that seems not to be a good idea
Add support to do flash/reset/term on an IoT-LAB node.
It also allow running test using 'testrunner'.
Configuration variables are:
* `IOTLAB_NODE` which should be set to your node url
* The full url including site to use from your computer `m3-1.grenoble.iot-lab.info`
* The short url when used on the IoT-LAB frontend `m3-1`
* `IOTLAB_EXP_ID` for your experiment id for flash and reset.
By default it tries to use your currently running experiment if you have only one
* `IOTLAB_USER`: is read from `${HOME}/.iotlabrc` as saved by `iotlab-auth`
* It is expected to have run `iotlab-auth` beforehand.
While working on #9352 I noticed that the order of members in the
`gnrc_sixlowpan_msg_frag_t` struct costs us 4 bytes in RAM due to byte
alignment. This PR fixes the order of members, so they are the most
packed.
