owner-nrf52sdk/nRF5_SDK_17.0.2/integration/nrfx/legacy/nrf_drv_ppi.c

/**
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 * 4. This software, with or without modification, must only be used with a
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#include "nrf_drv_ppi.h"

static nrfx_drv_state_t m_drv_state;          /**< Driver state */

ret_code_t nrf_drv_ppi_init(void)
{
    if (m_drv_state == NRFX_DRV_STATE_UNINITIALIZED)
    {
        m_drv_state = NRFX_DRV_STATE_INITIALIZED;
    }
    else
    {
        return NRF_ERROR_MODULE_ALREADY_INITIALIZED;
    }
    return NRF_SUCCESS;
}

ret_code_t nrf_drv_ppi_uninit(void)
{
    if (m_drv_state == NRFX_DRV_STATE_UNINITIALIZED)
    {
        return NRF_ERROR_INVALID_STATE;
    }

    m_drv_state = NRFX_DRV_STATE_UNINITIALIZED;
    nrfx_ppi_free_all();
    return NRF_SUCCESS;
}