ERROR 7 [NRF_ERROR_INVALID_PARAM] when changing MSEC param values for MIN and MAX CONN INTERVAL

[brominal]

When using MSEC_TO_UNITS for min and max connectivity interval, the documentation says MSEC_TO_UNITS can take in parameter value for time between 6 to 3200,

but when I am using 6 the debugger throws <error> app: ERROR 7 [NRF_ERROR_INVALID_PARAM]. 

#define MIN_CONN_INTERVAL MSEC_TO_UNITS(6, UNIT_1_25_MS) /**< Minimum acceptable connection interval (0.4 seconds). */
#define MAX_CONN_INTERVAL MSEC_TO_UNITS(6, UNIT_1_25_MS) /**< Maximum acceptable connection interval (0.65 second). */
#define SLAVE_LATENCY 0 /**< Slave latency. */
#define CONN_SUP_TIMEOUT MSEC_TO_UNITS(4000, UNIT_10_MS) /**< Connection supervisory timeout (4 seconds). */

Trying to get the time to be 7.5 ms, the lowest MSEC param that worked was 7.5

[Joakim Jakobsen]

Hi.

Trying to get the time to be 7.5 ms, the lowest MSEC param that worked was 7.5

The minimum allowed connection interval is 7.5ms. You can not set the connection interval to 6ms.

Documentation:
MSEC_TO_UNITS

Br,
Joakim

[brominal]

The documentation from the code said the range is 6-3200, this is incorrect then?

[brominal]

Inputting 7.5 into MSEC would result in a connection interval of (7.5*1.25) = 9.375 ms.

Here is the struct and the comment that mentions the range

/**@brief Connection interval range structure. */
typedef struct
{
    uint16_t                     min_conn_interval;                   /**< Minimum connection interval, in units of 1.25 ms, range 6 to 3200 (7.5 ms to 4 s). */
    uint16_t                     max_conn_interval;                   /**< Maximum connection interval, in units of 1.25 ms, range 6 to 3200 (7.5 ms to 4 s). The value 0xFFFF indicates no specific maximum. */
} ble_advdata_conn_int_t;

[Joakim Jakobsen]

I think you misunderstood. Take a look at the documentation I linked to. 
Input the number of ms you want the connection interval to be, and the macro will convert that to ticks. 

Br,

Joakim