BLUENRG-2 datasheet(26/190 Pages) STMICROELECTRONICS

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Functional details

BlueNRG-2

26/190

DocID030675 Rev 2

If the register CKGEN_SOC->REASON_RST = 0, according to the CKGEN_BLE-

>REASON_RST the possible reasons are:

Wakeup from IO9, IO10, IO11, IO12, IO13.

Wakeup from internal timer: BLE timer 1 or BLE timer 2.

POR or BOR

If the register CKGEN_SOC->REASON_RST is not 0, according to its value the

possible reasons are:

System reset

Watchdog reset

Lockup reset.

3.5.3

Switching to external clock

When the system is in preactive state (run from internal RO 16 MHz), the software

sequence to switch to active should include switch to external XO.

When the system uses an external XO at 32 MHz instead of 16 MHz, the following steps

need to be performed:

Set the bitfield MHZ32_SEL of register SYSTEM_CTRL for the digital part.

In the preactive state, inform the analog part of the external XO 32 MHz and send the

request to switch to ACTIVE2 state:

uint8_t config[] = { 0x02, 0x3A, 0x44, 0x02, 0x34, 0x1B, 0x00};

BLUE_CTRL->RADIO_CONFIG = 0x10000 | (uint16_t) ( (uint32_t)config &

0x0000FFFF );

while((BLUE_CTRL->RADIO_CONFIG & 0x10000) != 0);

Wait until the state machine is in the active state by using the following routine:

while(CKGEN_BLE->CLK32K_IT == 0);

CKGEN_BLE->CLK32K_IT = 1;

CKGEN_BLE->CLK32K_COUNT = 23;

CKGEN_BLE->CLK32K_PERIOD = 0;

Only after switching to the active state, write 0x15 in the COMMAND register of the

AHBUPCONV peripheral.

Around 10 system clock cycles after this last write, the system will run at 32 MHz except for

specific blocks requiring a fixed 16 MHz.

The application can make the bus and the core run at 16 MHz by writing 0x14 in

the COMMAND register of AHBUPCONV peripheral.

3.5.4

Clock and reset registers

CKGEN_SOC peripheral base address (CKGEN_SOC_BASE_ADDR) 0x40900000.

Table 14: CKGEN_SOC registers

Address offset

Name

Reset

Description

0x00

CONTROL

0x01FA03F0

Control clock and Reset of SOC. Refer to

the detailed description below.

0x08

REASON_RST

0x00000000

Indicates the Reset reason from Cortex-

M0. Refer to the detailed description

below.

0x1C

DIE_ID

0x00000100

Identification information of the device.

Refer to the detailed description below.

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