iic error NRF_ERROR_NO_MEM with app_sched_event_put

[pipixia_8_8]

hi 

i want to use iic in my project ,and i add iic func to my project refrence project twi_sensor.

the code of iic like this：

	i2c_config_t iic_config=
	{
		.scl_pin = I2C_CLK_PIN,
		.sda_pin = I2C_SDA_PIN,
		.freq    = I2C_SPEED_400K,
	};
void am_app_i2c_init (i2c_config_t i2c_config)
{
    ret_code_t err_code;

		nrf_drv_twi_frequency_t fre_table[]=
		{
			NRF_DRV_TWI_FREQ_100K,
			NRF_DRV_TWI_FREQ_250K,
			NRF_DRV_TWI_FREQ_400K,
		};
	
    const nrf_drv_twi_config_t twi_config = {
       .scl                = i2c_config.scl_pin,
       .sda                = i2c_config.sda_pin,
       .frequency          = fre_table[i2c_config.freq],
       .interrupt_priority = APP_IRQ_PRIORITY_HIGH,
       .clear_bus_init     = false
    };

    err_code = nrf_drv_twi_init(&m_twi, &twi_config, twi_handler, NULL);
    APP_ERROR_CHECK(err_code);

    nrf_drv_twi_enable(&m_twi);
}

void am_i2c_send_data(uint8_t addr,uint8_t const * p_data, uint8_t length, bool no_stop)
{
    ret_code_t err_code;

    err_code = nrf_drv_twi_tx(&m_twi, addr, p_data, length, no_stop);
    APP_ERROR_CHECK(err_code);
    while (m_xfer_done == false);

}

I call the api in the main 

	port_i2c_init();
		
	port_i2c_send(0xaa , data,  10);

then compile and download the hex to the chip,but the log show like this:

00> <error> app: ERROR 4 [NRF_ERROR_NO_MEM] at ..\..\..\..\..\..\components\libraries\timer\app_timer2.c:181
00> 
00> PC at: 0x0003817F

the code of app_timer2.c:181 is 

uint32_t err_code = app_sched_event_put(&timer_event,
sizeof(timer_event),
scheduled_timeout_handler);

some para like this:

#define NRF_QUEUE_ENABLED 1

#define SCHED_QUEUE_SIZE                    20                                         /**< Maximum number of events in the scheduler queue. */

i try change the  SCHED_QUEUE_SIZE   to 40 and change the ram ,it is  no effect. so what should i do to solve this problem ？

[pipixia_8_8]

void port_i2c_send(uint8_t addr,uint8_t *p_data, uint8_t length)
{

am_i2c_send_data( addr, p_data,length, 0 );

}

void port_i2c_read(uint8_t device_addr,uint8_t word_addr,uint8_t *p_data, uint8_t length)
{

am_i2c_read_data( device_addr, word_addr, p_data, length );

}

[pipixia_8_8]

i find the NRF_DRV_TWI_EVT_DONE of twi_handler can never comming by set the breakpoint be after "NRF_DRV_TWI_EVT_DONE:" in project twi_sensor, i try to comment the code "while (m_xfer_done == false);",it can work ,and i can see the wave by logic anlyzer:

so,now my confuse is why the event NRF_DRV_TWI_EVT_DONE of twi_handler will not comming ？and there if any 

potentially dangerous when send large data and the code comment "while (m_xfer_done == false)"?

[Kenneth]

I compiled the twi scanner example:

\nRF5_SDK_15.3.0_59ac345\examples\peripheral\twi_scanner

Then modified twi_init():

void twi_init (void)
{
    ret_code_t err_code;

    const nrf_drv_twi_config_t twi_config = {
       .scl                = ARDUINO_SCL_PIN,
       .sda                = ARDUINO_SDA_PIN,
       .frequency          = NRF_DRV_TWI_FREQ_400K,
       .interrupt_priority = APP_IRQ_PRIORITY_HIGH,
       .clear_bus_init     = false
    };

    err_code = nrf_drv_twi_init(&m_twi, &twi_config, NULL, NULL);
    APP_ERROR_CHECK(err_code);

    nrf_gpio_cfg_input(ARDUINO_SCL_PIN, NRF_GPIO_PIN_PULLUP);
    nrf_gpio_cfg_input(ARDUINO_SDA_PIN, NRF_GPIO_PIN_PULLUP);

    nrf_drv_twi_enable(&m_twi);
}

Can you repeat the same?

[pipixia_8_8]

hi. thank for your reply .

i try to modify the project as you say in

nRF5_SDK_16.0.0_98a08e2\examples\peripheral\twi_scanner

void twi_init (void)
{
    ret_code_t err_code;

    const nrf_drv_twi_config_t twi_config = {
       .scl                = ARDUINO_SCL_PIN,
       .sda                = ARDUINO_SDA_PIN,
       .frequency          = NRF_DRV_TWI_FREQ_400K,
       .interrupt_priority = APP_IRQ_PRIORITY_HIGH,
       .clear_bus_init     = false
    };

    err_code = nrf_drv_twi_init(&m_twi, &twi_config, NULL, NULL);
    APP_ERROR_CHECK(err_code);

    nrf_drv_twi_enable(&m_twi);
}

and the speed is also 200k,i use the chip is nrf52840.

and in this QA,the nrf52840 may have the same problem, in the sdk 16.0,it will occur.

devzone.nordicsemi.com/.../247002

[Kenneth]

Do you have pull-ups? Seems you are missing the two lines I shared on pull-up?

[pipixia_8_8]

yes,i connect the 3.3v to the sda and scl pin.and the iic also cant run in the speed of 400k

 

[Kenneth]

Can you look at the analog level on the twi scl? I suspect the problem here is a weak pull-up, so you can't achieve 400kHz because it take too long time to pull it up.

Best regards,
Kenneth