Hi
I figured out, that the macros in nrf_esb_resources.h are wrong.
/**
* @defgroup nrf_esb_resources ESB resources
* @{
* @ingroup nrf_esb
*/
#ifndef ESB_ALTERNATIVE_RESOURCES
#define ESB_PPI_CHANNELS_USED 0x00000007uL /**< PPI channels used by ESB (not available to the application). */
#define ESB_TIMERS_USED 0x00000004uL /**< Timers used by ESB. */
#define ESB_SWI_USED 0x00000001uL /**< Software interrupts used by ESB. */
#else
#define ESB_PPI_CHANNELS_USED 0x00000700uL /**< PPI channels used by ESB (not available to the application). */
#define ESB_TIMERS_USED 0x00000001uL /**< Timers used by ESB. */
#define ESB_SWI_USED 0x00000002uL /**< Software interrupts used by ESB. */
#endif
/** @} */
You can find the used resources (PPI, TIMER and SWI) of the ESB library in Enhanced ShockBurst User Guide.
But in nrf_esb_resources.h, PPI Channels 0, 1 and 2 are defined (0x7), instead of Channel 10, 11, 12 and 13 (0x3C00). PPI Channels 7, 8, 9 are obsolete?
The same with the timers. TIMER_2 is reserved, but TIMER_2 and TIMER_3 are used. In relation to this post (ESB obsolete macro), where the workaround with NRF_ESB_BUGFIX_TIMER is not necessary anymore, TIMER_3 could also be removed.
/**
* @defgroup nrf_esb_resources ESB resources
* @{
* @ingroup nrf_esb
*/
#define ESB_PPI_CHANNELS_USED 0x00003C00uL /**< PPI channels used by ESB (not available to the application). */
#define ESB_TIMERS_USED 0x00000004uL /**< Timers used by ESB. */
#define ESB_SWI_USED 0x00000001uL /**< Software interrupts used by ESB. */
/** @} */
