two channels spi on nrf52

[oliverhu]

Hi, i am new to embedded system.I want to use nrf52 DK as master and connected with two slaves by two spi channels? is it possible to achieve on nrf52 DK. 1>How to set up and configure the two spi channels? should i enable both spi1 and spi0? 2>if possible Can anyone offer me some example?

Thank You very much!!

[MartinBL]

Hi

If you want to use two separate instances of SPI modules:

In SDK 11 you will need to define what SPI modules you want to use in the nrf_drv_config.h file. In the SDK examples this file is located in the folder called "config" located in the example folder. In the file, scroll down until you find this line:

#define SPI0_ENABLED 0

and set it to 1. Then do the same on e.g. SPI module #1:

#define SPI1_ENABLED 1

Now, in your application you will have to crate an instance, configure, and enable both SPI modules. That can be done e.g. like this:

#define SPI0_INSTANCE  0 /**< First SPI instance index. */
#define SPI1_INSTANCE  1 /**< Second SPI instance index. */
static const nrf_drv_spi_t spi_0 = NRF_DRV_SPI_INSTANCE(SPI0_INSTANCE );  /**< First SPI instance. */
static const nrf_drv_spi_t spi_1 = NRF_DRV_SPI_INSTANCE(SPI1_INSTANCE );  /**< First SPI instance. */

nrf_drv_spi_config_t spi_config_0 = NRF_DRV_SPI_DEFAULT_CONFIG(SPI0_INSTANCE);
nrf_drv_spi_init(&spi_0, &spi_config_0, NULL);

nrf_drv_spi_config_t spi_config_1 = NRF_DRV_SPI_DEFAULT_CONFIG(SPI1_INSTANCE);
nrf_drv_spi_init(&spi_1, &spi_config_1, NULL);

Please have a look at the SPI peripheral example in the SDK for more details.

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If you want to use one SPI module, but have two SPI devices that must be connected to the same SPI bus:

Then you will simply have to implement two Slave Select pins (SS). One for device #1 and one for #2. These SS pins must be controlled in software by your application because slave select is not implemented in the SPI hardware modules.

[oliverhu]

Hi，martin， thank you very much, it works!