Recent measurements have shown that the total wake-up latency can be more
than the 3ms initially set. It was measured as 3,7ms on DISCO_L475VG_IOT01A
target and 3,1ms on NUCLEO_L073RZ target. So set it to 4ms to be on the
safe side.
i2c_byte_write implementation was broken.
Data sending was inside addressing block
Changed from:
i2c_byte_write
{
if (start) {
if (read_address)
start read;
esle
start write;
write byte;
}
}
to:
i2c_byte_write
{
if (start) {
// if first call after start
// address for reading or writing
if (read_address)
start read;
esle
start write;
} else {
// send data byte
write byte;
}
}
This is to meet platform name 'NU_PFM_M2351' registered in mbed-os-tools. This tool
uses the platform name as a key to search platform related properties in targets.json.
For example, the property 'forced_reset_timeout' is critical for Greentea test.
ARM Compiler 6.13 testing revealed linker errors pointing out
conflicting use of `__user_setup_stackheap` and
`__user_initial_stackheap` in some targets. Remove the unwanted
`__user_initial_stackheap` from the targets - the setup is
centralised in the common platform code.
Looking into this, a number of other issues were highlighted
* Almost all targets had `__initial_sp` hardcoded in assembler,
rather than getting it from the scatter file. This was behind
issue #11313. Fix this generally.
* A few targets' `__initial_sp` values did not match the scatter
file layout, in some cases meaning they were overlapping heap
space. They now all use the area reserved in the scatter file.
If any problems are seen, then there is an error in the
scatter file.
* A number of targets were reserving unneeded space for heap and
stack in their startup assembler, on top of the space reserved in
the scatter file, so wasting a few K. A couple were using that
space for the stack, rather than the space in the scatter file.
To clarify expected behaviour:
* Each scatter file contains empty regions `ARM_LIB_HEAP` and
`ARM_LIB_STACK` to reserve space. `ARM_LIB_STACK` is sized
by the macro `MBED_BOOT_STACK_SIZE`, which is set by the tools.
`ARM_LIB_HEAP` is generally the space left over after static
RAM and stack.
* The address of the end of `ARM_LIB_STACK` is written into the
vector table and on reset the CPU sets MSP to that address.
* The common platform code in Mbed OS provides `__user_setup_stackheap`
for the ARM library. The ARM library calls this during startup, and
it calls `__mbed_user_setup_stackheap`.
* The default weak definition of `__mbed_user_setup_stackheap` does not
modify SP, so we remain on the boot stack, and the heap is set to
the region described by `ARM_LIB_HEAP`. If `ARM_LIB_HEAP` doesn't
exist, then the heap is the space from the end of the used data in
`RW_IRAM1` to the start of `ARM_LIB_STACK`.
* Targets can override `__mbed_user_setup_stackheap` if they want.
Currently only Renesas (ARMv7-A class) devices do.
* If microlib is in use, then it doesn't call `__user_setup_stackheap`.
Instead it just finds and uses `ARM_LIB_STACK` and `ARM_LIB_HEAP`
itself.
Notes:
- CRC and TRNG are disabled on this board since the MCU on this board does not have the required hardware.
- QSPI and QSPIF are temporarily removed due to issues related to supporting the new S25FS512S flash chip we have on this board. These will be enabled as soon as we can get the issues resolved.
https://github.com/ARMmbed/mbed-os/issues/11722
Martin Kojtal
Laurent Meunier
Jammu Kekkonen
Maciej Bocianski
Chun-Chieh Li
Sebastian Stockhammer
Kevin Bracey
Ryan Morse
jeromecoutant
Giampaolo Mancini