topic Fixed wait cycle for Bluetooth power cycle. in i.MX Processors

Fixed wait cycle for Bluetooth power cycle.

t-iishii — Wed, 26 Apr 2017 11:21:40 GMT

Hello

About bluetooth power cycle reset function In i.MX6 Linux BSP,

It has a 3x 500msec fixed wait cycle operation to toggle bt_power_gpio.

Don' you know that it have some reason to keep 500msec?

Like a bluetooth module spec, stability of power device or specification of Bluetooth 4.0?.

source code is a following.

root/arch/arm/mach-imx/mx6_bt_rfkill.c

static void mxc_bt_rfkill_reset(void *rfkdata) {
      struct mxc_bt_rfkill_data *data = rfkdata;
      printk(KERN_INFO "mxc_bt_rfkill_reset\n");
      if (gpio_is_valid(data->bt_power_gpio)) {
           mdelay(500);
           gpio_set_value(data->bt_power_gpio, 0);
           mdelay(500);
           gpio_set_value(data->bt_power_gpio, 1);
           mdelay(500);
      }
}

Best regards,

Ishii.

Re: Fixed wait cycle for Bluetooth power cycle.

art — Fri, 28 Apr 2017 11:33:57 GMT

This time is required to provide a stable and reliable reset to the device.

Have a great day,
Artur

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Re: Fixed wait cycle for Bluetooth power cycle.

t-iishii — Mon, 01 May 2017 01:31:06 GMT

Artur

Thank you for your quick response.

I understand that this value are defined by the target device requirement.

Best regards,

Ishii.