1. Rearrange SDRAM and SRAM layout. Move timing critical code to SRAM,
and the rest to SDRAM.
2. Add bootloader that's capable of FOTA over mbed cloud.
Signed-off-by: Tony Wu <tonywu@realtek.com>
The FlashIAP is supposed to have access to the full application
memory, so the address scope has been changed to encompass
the entire external flash.
The address translation has also been changed to reflect the memory
layout in the documentation:
Realtek Ameba1 Memory Layout: 5.1 Flash Memory
fire_interrupt function should be used for events in the past. As we have now
64bit timestamp, we can figure out what is in the past, and ask a target to invoke
an interrupt immediately. The previous attemps in the target HAL tickers were not ideal, as it can wrap around easily (16 or 32 bit counters). This new
functionality should solve this problem.
set_interrupt for tickers in HAL code should not handle anything but the next match interrupt. If it was in the past is handled by the upper layer.
It is possible that we are setting next event to the close future, so once it is set it is already in the past. Therefore we add a check after set interrupt to verify it is in future.
If it is not, we fire interrupt immediately. This results in
two events - first one immediate, correct one. The second one might be scheduled in far future (almost entire ticker range),
that should be discarded.
The specification for the fire_interrupts are:
- should set pending bit for the ticker interrupt (as soon as possible),
the event we are scheduling is already in the past, and we do not want to skip
any events
- no arguments are provided, neither return value, not needed
- ticker should be initialized prior calling this function (no need to check if it is already initialized)
All our targets provide this new functionality, removing old misleading if (timestamp is in the past) checks.
The Ameba RTC driver converts time_t to
second/minute/hour/day/month/year in rtc_write and back to time_t in
rtc_read. Replace this with an implementation which uses time_t
directly.
There is an easy default implementation of spi_master_block_write that
just calls spi_master_write in a loop, so the default implementation
of spi_master_block_write has been added to all targets.
Yuguo Zou
Jimmy Brisson
Tony Wu
Deepika
Marcus Chang
Bartek Szatkowski
Martin Kojtal
Sam Grove
Russ Butler