HAL wiring api calls to access exflash read/write functions

[keeramis]

Description

Adds hal wiring API calls to access OTP

Solution

Make the relevant functions available over wiring protected by PARTICLE_USE_UNSTABLE_API

Steps to Test

Example App

#define PARTICLE_USE_UNSTABLE_API
#include "storage_hal.h"

#include "Particle.h"
SYSTEM_MODE(MANUAL)
const uintptr_t NCP_ID_OTP_ADDRESS = 0x00000020;

void setup() {
    uint8_t ncpId = 0;
    int r = hal_storage_read(HAL_STORAGE_ID_OTP, NCP_ID_OTP_ADDRESS, &ncpId, sizeof(ncpId));
    Log.info("Read result: %d / %u == %x", r, ncpId, ncpId);

    ncpId = 0x65;
    r = hal_storage_write(HAL_STORAGE_ID_OTP, NCP_ID_OTP_ADDRESS, &ncpId, sizeof(ncpId));
    Log.info("Write result: %d", r);

    r = hal_storage_read(HAL_STORAGE_ID_OTP, NCP_ID_OTP_ADDRESS, &ncpId, sizeof(ncpId));
    Log.info("Read result after writing: %d / %u == %x", r, ncpId, ncpId);
}

void loop() {
}

Result on P2 (will be similar on trackerM)

0000002148 [app] INFO: Read result: 1 / 255 == ff
0000002154 [app] INFO: Write result: 1
0000002157 [app] INFO: Read result after writing: 1 / 101 == 65

References

SC-108936

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Completeness

• User is totes amazing for contributing!
• Contributor has signed CLA (Info here)
• Problem and Solution clearly stated
• Run unit/integration/application tests on device
• Added documentation
• Added to CHANGELOG.md after merging (add links to docs and issues)

[mohitbhoite]

As a side, I had to use SYSTEM_MODE(MANUAL) otherwise the setup won't execute on unprovisioned devices, i.e., the new Tracker M boards.

[keeramis]

@mohitbhoite thanks for pointing that out. I will change the example app accordingly.