Question about SPI transaction manager

[Daniel]

Hello,

Some problems I meet when I try to use spi manager in ble_template example to read "who_am_i" register of LIS2DH12. The environment is set as below:

1. nRF52832 DevelopKit with SDK 14.1.0, ble_app_template project.

2. Connect the DevelopKit board to LIS2DH12 board with following pin map

   PIN0.03 -> LIS SCK   
   PIN0.04 -> LIS SDI/SDA/SDO   
   PIN0.28 -> LIS SDO/SA0   
   PIN0.29 -> LIS CS   
   

3. Add following functions in the main.c in the project

   static void accl_spi_transfer_done_cb(ret_code_t result, void * p_user_data)
   {
   	bsp_board_led_on(BSP_BOARD_LED_2);
   }
   
   static ret_code_t init_spi2_master(void)
   {
   	// SPI2 (with transaction manager) initialization
   	nrf_drv_spi_config_t const m_master2_config = 
   	{
   		.sck_pin		= ARDUINO_A0_PIN,
   		.mosi_pin		= ARDUINO_A1_PIN,
   		.miso_pin		= ARDUINO_A2_PIN,
   		.ss_pin			= ARDUINO_A3_PIN,
   		.irq_priority	= SPI_DEFAULT_CONFIG_IRQ_PRIORITY,
   		.orc			= 0xFF,
   		.frequency		= NRF_DRV_SPI_FREQ_4M,
   		.mode			= NRF_DRV_SPI_MODE_0,
   		.bit_order		= NRF_DRV_SPI_BIT_ORDER_MSB_FIRST
   	};
   	
   	return nrf_spi_mngr_init(&m_nrf_spi_mngr, &m_master2_config);
   }
   
   static void read_accl_info(void)
   {
   	ret_code_t ret_val;
   	uint8_t tx_cmd[] = {0x8F, 0xFF};
   	
   	nrf_spi_mngr_transfer_t const transfer[] = 
   	{
   		NRF_SPI_MNGR_TRANSFER(tx_cmd, sizeof(tx_cmd), &rx_data, sizeof(rx_data))
   	};
   	
   	nrf_spi_mngr_transaction_t const trans[] = 
   	{
   		{
   			.begin_callback		 = NULL,
   			.end_callback		 = accl_spi_transfer_done_cb,
   			.p_user_data		 = NULL,
   			.p_transfers		 = &transfer[0],
   			.number_of_transfers = 1,
   			.p_required_spi_cfg  = NULL
   		}
   	};
   	
   	ret_val = nrf_spi_mngr_schedule(&m_nrf_spi_mngr, &trans[0]);
   	APP_ERROR_CHECK(ret_val);
   }
   

4. Put the initialization function and read_accl_info function after ble_stack_init() function.

5. Open SPI_MNGR, NRF_QUEUE and SPI_ENABLE in sdk_config.h

6. Add following defines in the head of main.c

   #define ACCL_SPI_QUEUE_LENGTH			5
   #define ACCL_SPI_INSTANCE_ID			0
   NRF_SPI_MNGR_DEF(m_nrf_spi_mngr, ACCL_SPI_QUEUE_LENGTH, ACCL_SPI_INSTANCE_ID);
   static uint8_t rx_data[2];
   

Result, the program is seem to be stuck at read_accl_info function. If I comment it, the program runs successfully. I try to add some breakpoints and run into that function, but every thing is ok, the return value is NRF_SUCCESS. I hope that some one can give me some suggestions. Thanks a lot!

main.c

[Jakub Rzeszutko]

Do you use SPI or SPIM (do you use EasyDMA) ?

[Daniel]

yes, I turned on the SPI and SPIM2, also tried EasyDMA on and off state, but it leads to the same result.

[Daniel]

Well, it seems that I send the wrong command. I use the spi_manager example to make a test, send the right command "tx_cmd[] = {0x8F, 0xFF}", then I get the correct who_am_i register value. However, I find that the callback function doesn't work, even if I put a breakpoint in it.

[Daniel]

OK, after some tests, if I comment

     nrf_pwr_mgmt_run();

In the while loop in main function, the spi_manager will go to the end callback, but if the power_mgmt exists, it will not go to the end callback, why?

[Jakub Rzeszutko]

It is hard to guess. Please maybe share a source how you use this nrf_pwr_mgmt_run function.

Regarding your first case I was asking about SPI/SPIM because when using SPIM (EasyDMA) you cannot have "const" transfer variable. All data needs to be in RAM. Your declaration shall be like:

static nrf_spi_mngr_transfer_t transfer[] = 
{
    NRF_SPI_MNGR_TRANSFER(tx_cmd, sizeof(tx_cmd), &rx_data, sizeof(rx_data))
};