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X-NUCLEO-IDB05A1 reset time

Topic last updated 13 Jun 2017, by Christopher Jones. 2 replies
Julien Quere
30 Mar 2017

Hello,

I tried recently the X-NUCLEO-IDB05A1 BLE shield with my Nucleo_L476RG board running some mbed example. Unfortunately, none of the examples worked for me. After a long time of debugging, it appears that it is the reset time of the shield which is the origin of the issue. Indeed, when I compared the X-NUCLEO_IDB0XA1 mbed library with the one on the STM32 Cube Expansion BLE, I saw that the library on mbed only wait 5us between reset and 505us after reset when the one on the cube wait 5ms between and after the reset. When I set this values in the mbed libray, all of the examples worked finally fine.

I just changed those lines:

X_NUCLEO_IDB0XA1 Reset Fix (BlueNRGDevice.cpp)

void BlueNRGDevice::reset(void)
{    
    wait_us(500);
    /* Reset BlueNRG SPI interface */
    rst_ = 0;
    wait_us(5);
    rst_ = 1;
    wait_us(5);
    /* Wait for the radio to come back up */
    wait_us(500);
}

by :

X_NUCLEO_IDB0XA1 Reset Fix (BlueNRGDevice.cpp)

void BlueNRGDevice::reset(void)
{
    /* Reset BlueNRG SPI interface */
    rst_ = 0;
    wait_ms(5);
    rst_ = 1;
    wait_ms(5);
}

Maybe you should also make this change in the repo to avoid other people to have this problem.

Note: this only happen with mbed OS 5. Strangely, the example with mbed OS 2 works fine.

Julien.

James Osborne
31 May 2017

Funny, I have been struggling to get the X-NUCLEO-IDB05A1 BLE shield working with my Nucleo_L476RG, as well. And I have had no luck getting mbed OS 2 to work. I can get OK results with the F401RE, but even that is flaky.

Christopher Jones
13 Jun 2017

I just tried this myself and can now detect the device using the stm32 ble profiles program on my phone. i can also connect (takes a little while)