Custom Board Pin Mapping

RE: Custom Board Pin Mapping

Jørgen Holmefjord — Fri, 18 Aug 2017 11:32:47 GMT

You need to move 0R resistor from R25/R26 to R27/R28 if you want the GPIOs to be connected to the pin headers.

RE: Custom Board Pin Mapping

User1321 — Fri, 18 Aug 2017 10:46:24 GMT

I guess I need to remove resistors R25 and R26 as it is stated here: infocenter.nordicsemi.com/index.jsp I need to do this in order to make a proper evaluation

RE: Custom Board Pin Mapping

User1321 — Thu, 17 Aug 2017 16:49:53 GMT

Did this last solution for using the NFC pins as gpio worked ? I am using the nrf52 DK and it does not work properyl! Is there anything else needed besides setting this flag? I am flashing the uc through armgcc, so what I basically do is to add the CONFIG_NFCT_PINS_AS_GPIOS on the makefile.

RE: Custom Board Pin Mapping

Jørgen Holmefjord — Thu, 22 Dec 2016 15:50:08 GMT

I would recommend that you add the flags CONFIG_NFCT_PINS_AS_GPIOS and remove the flag CONFIG_GPIO_AS_PINRESET from your makefile.

RE: Custom Board Pin Mapping

Jørgen Holmefjord — Thu, 22 Dec 2016 15:44:58 GMT

I would recommend doing something like this:

pca10040.h/custom_board.h:

#define TWI0_SCL_PIN             11
#define TWI0_SDA_PIN             12

nrf_drv_config.h:

#define TWI0_ENABLED 1

#if (TWI0_ENABLED == 1)
#define TWI0_USE_EASY_DMA 1

#define TWI0_CONFIG_FREQUENCY    NRF_TWI_FREQ_100K
#define TWI0_CONFIG_SCL          TWI0_SCL_PIN             
#define TWI0_CONFIG_SDA          TWI0_SDA_PIN             
#define TWI0_CONFIG_IRQ_PRIORITY APP_IRQ_PRIORITY_LOW

#define TWI0_INSTANCE_INDEX      0
#endif

main.c:

static const nrf_drv_twi_t m_twi0 = NRF_DRV_TWI_INSTANCE(TWI0_INSTANCE_INDEX);

const nrf_drv_twi_config_t twi0_config  = NRF_DRV_TWI_DEFAULT_CONFIG(TWI0_INSTANCE_INDEX);

//   You can also configure pins manually:
//
//   const nrf_drv_twi_config_t twi0_config = {
//      .scl                = 11,
//      .sda                = 12,
//      .frequency          = NRF_TWI_FREQ_100K,
//      .interrupt_priority = APP_IRQ_PRIORITY_HIGH
//   };

nrf_drv_twi_init(&m_twi0, &twi0_config , twi_handler, NULL);

RE: Custom Board Pin Mapping

Rodrigo Lorenzo Leal — Thu, 22 Dec 2016 15:24:37 GMT

Jørgen.

So If I create a custom_board.h file and for example, initialize a TWI interface (in my app) assigning the correspondent pin defined in the custom_board.h file, it will suffice?

Also, and sorry to be this repetitive, how can I configure the NFC and the nRESET pin (P0.21) to work as GPIO?

Thanks again.

RE: Custom Board Pin Mapping

Jørgen Holmefjord — Thu, 22 Dec 2016 15:14:27 GMT

I understand that this can be a bit confusing, as there are a lot of defines and not always that easy to figure out which one is used. In the end, it is the pins configured in the initialization of the module that will be used. The pins defined in nrf_drv_config.h is the default pins used when initializing an interface without providing a configuration structure. The defines in the board header file can be used to set the defaut pins in nrf_drv_config.h or in any other source file, but you are not required to use these defines, you can just as well use pin numbers or defines set somewhere else in the code. Changing the defines in the board header does not have any effect unless they are used somewhere else in the code.

RE: Custom Board Pin Mapping

Rodrigo Lorenzo Leal — Thu, 22 Dec 2016 15:00:09 GMT

I forgot to write this on my previous comment.

Since I only have one button, and all the LED's in my system are access trough a I2C I/O expander, I'm not planning in using the BSP. Is this OK or I need to define a BSP file for my custom board?

RE: Custom Board Pin Mapping

Rodrigo Lorenzo Leal — Thu, 22 Dec 2016 14:53:40 GMT

Jørgen.

Thanks for your reply. I already created custom_board.h file according to my hardware design. I don't really understand how to map this in the nrf_drv_config.h . For example, in the pca_10040.h file, the SCL and SDA pins are define as pin number 27 and 26, yet in the nrf_drv_config.h they're define like this:

#define TWI0_ENABLED 1

#if (TWI0_ENABLED == 1)
#define TWI0_USE_EASY_DMA 0

#define TWI0_CONFIG_FREQUENCY    NRF_TWI_FREQ_100K
#define TWI0_CONFIG_SCL          0
#define TWI0_CONFIG_SDA          1
#define TWI0_CONFIG_IRQ_PRIORITY APP_IRQ_PRIORITY_LOW

#define TWI0_INSTANCE_INDEX      0
#endif

Finally, how and where (custom_board.h or nrf_drv_config.h) do I configure the NFC and the nRESET pin (P0.21) to work as GPIO?

RE: Custom Board Pin Mapping

Jørgen Holmefjord — Thu, 22 Dec 2016 14:02:37 GMT

Hi,

You are not required to create a custom_board.h, but it is convenient to have all peripheral pin defines in a common file. This also makes it easier to switch between different boards, given that the rest of the source files is setup to use the common defines. There is a short description of how to create the file here, but I would recommend that you start with the pca10040.h board file if you have developed your firmware using the nRF52 DK.

You can use the defined from custom_board.h in nrf_drv_config.h, for configuration of TWI, UART etc. As the NFC and reset pins have special functions, they have to be configured if you want to use these for general GPIO.

Best regards,

Jørgen