uint32_t nrf_drv_ppi_channel_alloc(nrf_ppi_channel_t * p_channel)
{
uint32_t err_code;
nrf_ppi_channel_t channel;
uint32_t mask = 0;
err_code = NRF_ERROR_NO_MEM;
mask = NRF_PPI_PROG_APP_CHANNELS_MASK;
for (channel = NRF_PPI_CHANNEL0; mask != 0; mask &= ~nrf_drv_ppi_channel_to_mask(channel), channel++)
{
CRITICAL_REGION_ENTER();
if ((mask & nrf_drv_ppi_channel_to_mask(channel)) && (!is_allocated_channel(channel)))
{
channel_allocated_set(channel);
*p_channel = channel;
err_code = NRF_SUCCESS;
}
CRITICAL_REGION_EXIT();
if (err_code == NRF_SUCCESS)
{
break;
}
}
return err_code;
}
uint32_t nrf_drv_ppi_channel_alloc(nrf_ppi_channel_t * p_channel)
{
uint32_t err_code = NRF_SUCCESS;
nrf_ppi_channel_t channel;
uint32_t mask = 0;
err_code = NRF_ERROR_NO_MEM;
mask = NRF_PPI_PROG_APP_CHANNELS_MASK;
for (channel = NRF_PPI_CHANNEL0; mask != 0; mask &= ~nrf_drv_ppi_channel_to_mask(channel), channel++)
{
CRITICAL_REGION_ENTER();
if ((mask & nrf_drv_ppi_channel_to_mask(channel)) && (!is_allocated_channel(channel)))
{
channel_allocated_set(channel);
*p_channel = channel;
err_code = NRF_SUCCESS;
}
CRITICAL_REGION_EXIT();
if (err_code == NRF_SUCCESS)
{
NRF_LOG_INFO("Allocated channel: %d.\r\n", channel);
break;
}
}
NRF_LOG_INFO("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
return err_code;
}
uint32_t nrf_drv_ppi_channel_disable(nrf_ppi_channel_t channel)
{
uint32_t err_code;
if (!is_app_channel(channel))
{
err_code = NRF_ERROR_INVALID_PARAM;
}
else if (is_programmable_app_channel(channel) && !is_allocated_channel(channel))
{
err_code = NRF_ERROR_INVALID_STATE;
}
else
{
#if (NRF_PPI_RESTRICTED > 0)
err_code = sd_ppi_channel_enable_clr(nrf_drv_ppi_channel_to_mask(channel));
#else
nrf_ppi_channel_disable(channel);
err_code = NRF_SUCCESS;
#endif
}
return err_code;
}
uint32_t nrf_drv_ppi_channel_free(nrf_ppi_channel_t channel)
{
uint32_t err_code;
if (!is_programmable_app_channel(channel))
{
err_code = NRF_ERROR_INVALID_PARAM;
}
else
{
// First disable this channel
#if (NRF_PPI_RESTRICTED > 0)
err_code = sd_ppi_channel_enable_clr(nrf_drv_ppi_channel_to_mask(channel));
#else
nrf_ppi_channel_disable(channel);
err_code = NRF_SUCCESS;
#endif
CRITICAL_REGION_ENTER();
channel_allocated_clr(channel);
CRITICAL_REGION_EXIT();
}
return err_code;
}
/**@brief Check whether a channel is a programmable channel and can be used by an application.
* @param[in] channel Channel to check.
* @retval true The channel is a programmable application channel.
* false The channel is used by a SoftDevice or is preprogrammed.
*/
__STATIC_INLINE bool is_programmable_app_channel(nrf_ppi_channel_t channel)
{
return ((NRF_PPI_PROG_APP_CHANNELS_MASK & nrf_drv_ppi_channel_to_mask(channel)) != 0);
}
/**@brief Set channel allocated indication.
* @param[in] channel_num Specifies the channel to set the "allocated" indication.
*/
__STATIC_INLINE void channel_allocated_set(nrf_ppi_channel_t channel)
{
m_channels_allocated |= nrf_drv_ppi_channel_to_mask(channel);
}
/**@brief Check whether a channel is allocated.
* @param[in] channel_num Channel number to check.
* @retval true The channel is allocated.
* false The channel is not allocated.
*/
__STATIC_INLINE bool is_allocated_channel(nrf_ppi_channel_t channel)
{
return ((m_channels_allocated & nrf_drv_ppi_channel_to_mask(channel)) != 0);
}
/**@brief Check whether a channel can be used by an application.
* @param[in] channel Channel to check.
* @retval true The channel can be used by an application.
* false The channel is used by a SoftDevice.
*/
__STATIC_INLINE bool is_app_channel(nrf_ppi_channel_t channel)
{
return are_app_channels(nrf_drv_ppi_channel_to_mask(channel));
}
