PPI With SoftDevice

[letter57]

Hi everyone:
I use nrf_drv_ppi_channel_alloc(&m_ppi_channel1) to allocate ppi channel. Every time i call nrf_drv_ppi_channel_alloc(&m_ppi_channel1), the m_ppi_channel1 will increase. when m_ppi_channel1 > 16 will return error. How to release ppi channel? Is it correct to Using sd_ppi_channel_enable_clr() to release ppi channel? or any suggestions?

void	ppi_init(void)
{
     	uint32_t err_code = NRF_SUCCESS;

	err_code = nrf_drv_ppi_channel_alloc(&m_ppi_channel1);
    APP_ERROR_CHECK(err_code);
	NRF_LOG_INFO("PPI Channel: %d", m_ppi_channel1);			
	
	err_code = sd_ppi_channel_assign(m_ppi_channel1,
				(const volatile void *)nrf_drv_gpiote_in_event_addr_get(TAGSENSOR_PIN),
				(const volatile void *)nrf_drv_timer_task_address_get(&timer1, NRF_TIMER_TASK_CAPTURE0));	
	APP_ERROR_CHECK(err_code);

	err_code = sd_ppi_channel_enable_set(1 << m_ppi_channel1);

    APP_ERROR_CHECK(err_code);				
}

void  tag_sensor_test(void)
{
    uint32_t err_code;

    ppi_init();

    do_something...

    err_code = sd_ppi_channel_enable_clr(1 << m_ppi_channel1);
    APP_ERROR_CHECK(err_code);
}

[MartinBL]

Hi,

Have you looked at nrf_drv_ppi_channel_free()?

[letter57]

Hi Martin :
Using nrf_drv_ppi_channel_free() to release PPI Channel，it works fine. Another question, if i use nrf_drv_ppi_uninit() instead of nrf_drv_ppi_channel_free(), will it release ppi channel? I have tried it and it looks unworkable.

[MartinBL]

There is a function called channel_allocated_clr_all() inside nrf_drv_ppi_uninit() which is supposed to clear all channels. How is it not working for you? What happens?