[TY51822r3] add platform

[ytsuboi]

Added new nRF51822 platform.

Test summary:
+---------+-----------+-----------+-------------+---------------------------------------+--------------------+---------------+-------+
| Result  | Target    | Toolchain | Test ID     | Test Description                      | Elapsed Time (sec) | Timeout (sec) | Loops |
+---------+-----------+-----------+-------------+---------------------------------------+--------------------+---------------+-------+
| TIMEOUT | TY51822R3 | ARM       | DTCT_1      | Simple detect test                    |       80.41        |       40      |  0/1  |
| OK      | TY51822R3 | ARM       | EXAMPLE_1   | /dev/null                             |        3.46        |       20      |  1/1  |
| OK      | TY51822R3 | ARM       | MBED_10     | Hello World                           |        0.37        |       5       |  1/1  |
| OK      | TY51822R3 | ARM       | MBED_11     | Ticker Int                            |       11.37        |       15      |  1/1  |
| OK      | TY51822R3 | ARM       | MBED_12     | C++                                   |        1.39        |       10      |  1/1  |
| OK      | TY51822R3 | ARM       | MBED_2      | stdio                                 |        0.78        |       20      |  1/1  |
| OK      | TY51822R3 | ARM       | MBED_23     | Ticker Int us                         |       11.34        |       15      |  1/1  |
| FAIL    | TY51822R3 | ARM       | MBED_24     | Timeout Int us                        |       16.63        |       15      |  0/1  |
| OK      | TY51822R3 | ARM       | MBED_25     | Time us                               |       12.14        |       15      |  1/1  |
| OK      | TY51822R3 | ARM       | MBED_26     | Integer constant division             |        1.39        |       20      |  1/1  |
| OK      | TY51822R3 | ARM       | MBED_34     | Ticker Two callbacks                  |       11.37        |       15      |  1/1  |
| OK      | TY51822R3 | ARM       | MBED_37     | Serial NC RX                          |       11.07        |       20      |  1/1  |
| OK      | TY51822R3 | ARM       | MBED_38     | Serial NC TX                          |       15.58        |       20      |  1/1  |
| OK      | TY51822R3 | ARM       | MBED_A1     | Basic                                 |        1.37        |       20      |  1/1  |
| OK      | TY51822R3 | ARM       | MBED_A21    | Call function before main (mbed_main) |        1.42        |       20      |  1/1  |
| OK      | TY51822R3 | ARM       | MBED_A9     | Serial Echo at 115200                 |        6.93        |       20      |  1/1  |
| OK      | TY51822R3 | ARM       | MBED_BUSOUT | BusOut                                |        2.29        |       45      |  1/1  |
+---------+-----------+-----------+-------------+---------------------------------------+--------------------+---------------+-------+
Result: 1 FAIL / 15 OK / 1 TIMEOUT

[0xc0170]

Can you provide brief description what it does?

I don't understand these 2 lines : if (*(uint32_t *)0x10001008 == 0xFFFFFFFF) and NVIC_SystemReset();

[ytsuboi]

This code wriging the value 0xFFFFFF00 to the UICR (User Information Configuration Register) at address 0x10001008, to make nRF51 works with 32MHz system clock. Physically, tiny footprint XTAL oscillate higher freq. To make BLE modules smaller, some modules are using 32MHz XTAL. After changing the value, nRF51 need to reboot.
This register will be overwritten by SoftDevice to 0xFFFFFFFF, the default value. Each hex files built with mbed classic online compiler contain SoftDevice, so that, this code run once just after the hex file flashed onto nRF51.

[0xc0170]

Worth adding it there as a comment

[ytsuboi]

comment added.

[0xc0170]

👍