Introduction
Starting from version 14.1.0, this SDK supports developing for the nRF52810 SoC on the PCA10040 board, which uses nRF52832. The nRF52810 IC is a subset of the nRF52832 with smaller RAM and flash, and with less peripheral resources. Therefore, you can use nRF52832 to emulate the functionality of nRF52810.
For detailed information on the SoC, see nRF52810 Product Specification.
See nRF52 Series comparison for a detailed comparison of the features of the various nRF52 Series chips.
You can use the SDK to develop your own applications for nRF52810. A dedicated development kit for nRF52810 is not available, but this SDK provides you with emulated projects, located in the 'pca10040e' folder. You can run these projects on an nRF52832 based PCA10040 and use them as a starting point for nRF52810 development. The emulated projects are available for the following examples:
- Hardware peripheral examples:
- UART
- SAADC
- Most BLE peripheral examples
- Direct Test Mode (DTM)
You can also create a similar emulated project for any other example, as long as it is compatible in terms of used peripherals. See Creating your own emulated project.
Additionally, in some cases, a small hardware modification might be required on the PCA10040 board. See Hardware emulation of nRF52810.
This approach has certain limitations, as some features cannot be effectively emulated in this way. See Limitations.
Hardware emulation of nRF52810
Due to a slightly different architecture of the COMP module, in special cases it is necessary to introduce a manual hardware change before using PCA10040 for nRF52810 development. If you want to use VDD/2 as analog input on the AIN7 pin of nRF52810, you must create a voltage divider and set it up according to the following figure.
Limitations
The following features of nRF52810 cannot be fully emulated using an nRF52832 Development Kit (PCA10040) with this SDK:
| Differences | nRF52832 | nRF52810 |
|---|---|---|
| SPIM: RXD.MAXCNT | 8-bit | 10-bit |
| SPIM: TXD.MAXCNT | 8-bit | 10-bit |
| SPIS: RXD.MAXCNT | 8-bit | 10-bit |
| SPIS: TXD.MAXCNT | 8-bit | 10-bit |
| TWIM: RXD.MAXCNT | 8-bit | 10-bit |
| TWIM: TXD.MAXCNT | 8-bit | 10-bit |
| TWIS: RXD.MAXCNT | 8-bit | 10-bit |
| TWIS: TXD.MAXCNT | 8-bit | 10-bit |
| UARTE: RXD.MAXCNT | 8-bit | 10-bit |
| UARTE: TXD.MAXCNT | 8-bit | 10-bit |
Software emulation of nRF52810
All SDK examples for nRF52810 are configured to be run on the nRF52 Development Kit, which uses nRF52832 (PCA10040). These examples use an emulated project that is stored in the 'pca10040e' folder. All examples that are hardware compatible can be set up to emulate nRF52810 on nRF52832, even though the emulated project is not available for all of them. Hardware compatibility means that a project uses only the resources present in nRF52810, including peripherals and memory.
- Note
- The example projects located in the 'pca10040e' folder include all Errata workarounds for nRF52832.
Creating your own emulated project——这一条很重要！
If the emulated project is not available for the example you need, then complete these steps to emulate the nRF52810 SoC.
- Open the example project for your IDE.
- In the project settings, change to device "NordicSemiconductor->nRF52810_xxaa".
- In the C/C++ preprocessor settings, remove the defines "NRF52" and "NRF52832_XXAA".
- Add the preprocessor define "NRF52810_XXAA".
- In the linker script settings, adjust the linker script to match the maximum RAM and flash size of nRF52810.
- ROM END: 0x2FFFF
- RAM END: 0x20005FFF
- Remove the following files from the project:
<compiler>_startup_nrf52.sandsystem_nrf52.c. - Add the following files to the project:
<compiler>_startup_nrf52810.sandsystem_nrf52810.c. - Add the
DEVELOP_IN_NRF52832define to the compile flags. Adding this define will add extra code inSystemInithandling the Errata workarounds needed for nRF52832. This will result in an increase in flash usage and a longer startup time.
Transferring the project to nRF52810 hardware
If you have already developed your application starting from the standard PCA10040 project, follow this procedure to reconfigure your project before it can be transferred and run natively on nRF52810.
- Note
- As part of this procedure, you must change the BSP to the one matching your custom board. See Using the SDK with other boards.
- Open the example project for your IDE.
- In the project settings, change to device "NordicSemiconductor->nRF52810_xxaa".
- In the C/C++ preprocessor settings, remove the defines "NRF52" and "NRF52832_XXAA".
- Add the preprocessor define "NRF52810_XXAA".
- In the linker script settings, adjust the linker script to match the maximum RAM and flash size of nRF52810.
- ROM END: 0x2FFFF
- RAM END: 0x20005FFF
- Remove the following files from the project:
<compiler>_startup_nrf52.sandsystem_nrf52.c. - Add the following files to the project:
<compiler>_startup_nrf52810.sandsystem_nrf52810.c.
Transferring emulated project
If you have developed your application using the emulated project as a starting point, there is only one step you need to perform before you can run it natively on nRF52810: In your IDE, remove the DEVELOP_IN_NRF52832 define from the compile flags.
来源：oschina
链接：https://my.oschina.net/u/4333042/blog/3651456