connect to the nRF52840-DK with the STM32F103 development board

RE: connect to the nRF52840-DK with the STM32F103 development board

Karl Ylvisaker — Wed, 21 Oct 2020 09:07:37 GMT

Hello,

From the sdk_config you shared - which is the same as the UART example's - it is apparent that you are only enabling UART0, and not UART1.
This is the reason why you are not able to use UART1.
Please define UART1_ENABLED to 1, and see if you then are able to create a UART1 instance in your application.

[quote user="kyh-ly"]And I also find I can not use two UARTs(UART1 and UART0) at the same time.[/quote]

Please be advised that when you are using the legacy UART ( instead of nrfx_uarte ) the CPU will need to be involved in each transfer. Instead, I recommend that you use the nrfx_uarte driver, which uses the easyDMA feature.
Which SDK version are you working with?

Best regards,
Karl

RE: connect to the nRF52840-DK with the STM32F103 development board

kyh-ly — Wed, 21 Oct 2020 08:56:51 GMT

Can there have a complete using uart0 and uart1 transmission example? It's difficult for me to work for it. And I also find I can not use two UARTs(UART1 and UART0) at the same time.By configurating APP_UART_DRIVER_INSTANCE 0/1, I can use UART0/UART1 respectively.

RE: connect to the nRF52840-DK with the STM32F103 development board

kyh-ly — Wed, 21 Oct 2020 01:54:36 GMT

Same as sdk_config.h provided in the UART example.

//UARTE configure

#ifndef NRFX_UARTE_ENABLED
#define NRFX_UARTE_ENABLED 1
#endif
// <o> NRFX_UARTE0_ENABLED - Enable UARTE0 instance
#ifndef NRFX_UARTE0_ENABLED
#define NRFX_UARTE0_ENABLED 0
#endif

// <o> NRFX_UARTE1_ENABLED - Enable UARTE1 instance
#ifndef NRFX_UARTE1_ENABLED
#define NRFX_UARTE1_ENABLED 0
#endif

//NRFX_UART_ENABLED - nrfx_uart - UART peripheral driver

#ifndef NRFX_UART_ENABLED
#define NRFX_UART_ENABLED 1
#endif
// <o> NRFX_UART0_ENABLED - Enable UART0 instance
#ifndef NRFX_UART0_ENABLED
#define NRFX_UART0_ENABLED 0
#endif

// <e> UART_ENABLED - nrf_drv_uart - UART/UARTE peripheral driver - legacy layer
//==========================================================
#ifndef UART_ENABLED
#define UART_ENABLED 1
#endif

// <e> UART0_ENABLED - Enable UART0 instance
//==========================================================
#ifndef UART0_ENABLED
#define UART0_ENABLED 1
#endif
// <q> UART0_CONFIG_USE_EASY_DMA - Default setting for using EasyDMA

#ifndef UART0_CONFIG_USE_EASY_DMA
#define UART0_CONFIG_USE_EASY_DMA 1
#endif

// </e>

// <e> UART1_ENABLED - Enable UART1 instance
//==========================================================
#ifndef UART1_ENABLED
#define UART1_ENABLED 0
#endif

RE: connect to the nRF52840-DK with the STM32F103 development board

Karl Ylvisaker — Tue, 20 Oct 2020 10:39:03 GMT

[quote user="kyh-ly"]I want to know how to specify the specific configuration of the UART1.[/quote]

Depending on what you would like to configure, it is either done in sdk_config or during the initialization.

[quote user="kyh-ly"]I always configure the UART0 and the UART1 doesn't work.Which files should I modify.[/quote]

The UART instance is configured in your sdk_config file, and the global instance should be initialized at the beginning of your main file.
What is your UART configurations in sdk_config?

Best regards,
Karl

RE: connect to the nRF52840-DK with the STM32F103 development board

kyh-ly — Tue, 20 Oct 2020 02:55:35 GMT

I want to know how to specify the specific configuration of the UART1. I always configure the UART0 and the UART1 doesn't work.Which files should I modify.

void uart_init(){

const app_uart_comm_params_t comm_params =
{
SER_APP_RX_PIN,SER_APP_TX_PIN,
SER_APP_RTS_PIN,SER_APP_CTS_PIN,
/*RX_PIN_NUMBER,
TX_PIN_NUMBER,
RTS_PIN_NUMBER,
CTS_PIN_NUMBER,*/
UART_HWFC,
false,
#if defined (UART_PRESENT)
NRF_UART_BAUDRATE_115200
#else
NRF_UARTE_BAUDRATE_115200
#endif
};

APP_UART_FIFO_INIT(&comm_params,
UART_RX_BUF_SIZE,
UART_TX_BUF_SIZE,
uart_error_handle,
APP_IRQ_PRIORITY_LOWEST,
err_code);

APP_ERROR_CHECK(err_code);

}

RE: connect to the nRF52840-DK with the STM32F103 development board

Karl Ylvisaker — Mon, 19 Oct 2020 12:49:31 GMT

Hello again,

Yes, this is an excellent idea. The nRF5 SDK's examples demonstrates a lot of the features available to the nRF device series, and how you may go about using them. I recommend starting with a non-BLE example ( such as the UART example I linked in my previous reply ), to get familiar with the peripheral, and then moving on to one of the examples that include BLE ( Such as the ble_app_uart examples ).

Please do not hesitate to open a new ticket on the forum if you should encounter any issues or questions!

Best regards,
Karl

RE: connect to the nRF52840-DK with the STM32F103 development board

kyh-ly — Mon, 19 Oct 2020 12:39:23 GMT

Thank you, The first thing I must to do is familiar with the SDK and the hardware.

RE: connect to the nRF52840-DK with the STM32F103 development board

Karl Ylvisaker — Mon, 19 Oct 2020 12:21:24 GMT

Hello again,

[quote user="kyh-ly"]I want to use the UART1 to transmit the data from my board, and I can not find any useful instructions on how to configure UART1.[/quote]

Have you seen the UART peripheral hardware example from the SDK?
It demonstrates how you could use the UART peripheral, and how to configure which UART instance you will be using in the sdk_config file.

[quote user="kyh-ly"]below is another people code that configuring the UART0 by directly accessing the register(I can not confirm if right)[/quote]

Where did you find this code? I would recommend that you make use of the supplied UART drivers, or app uart library, rather than working with the peripheral's registers directly. Especially if you are not comfortable with working at the register level.

Best regards,
Karl

RE: connect to the nRF52840-DK with the STM32F103 development board

kyh-ly — Mon, 19 Oct 2020 11:36:24 GMT

I want to use the UART1 to transmit the data from my board, and I can not find any useful instructions on how to configure UART1. below is another people code that configuring the UART0 by directly accessing the register(I can not confirm if right). I also want to configure uart1 using the register.

void uart_init(){

NRF_P0->OUTSET = 1 << UART_TX_PIN;//Set UART pin number bits in GPIO port

// tx pin configured as output
NRF_P0->PIN_CNF[UART_TX_PIN] = \
((uint32_t)GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos)
| ((uint32_t)GPIO_PIN_CNF_INPUT_Disconnect << GPIO_PIN_CNF_INPUT_Pos)
| ((uint32_t)GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
| ((uint32_t)GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
| ((uint32_t)GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);

// rx pin configured as input // 执行的就该函数是 nrf_gpio_cfg_input()-->nrf_gpio_cfg
NRF_P0->PIN_CNF[UART_RX_PIN] = \
((uint32_t)GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos)
| ((uint32_t)GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
| ((uint32_t)GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
| ((uint32_t)GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
| ((uint32_t)GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);

// configure uart

NRF_UART0->BAUDRATE = (uint32_t)(UART_BAUDRATE_115200);
NRF_UART0->CONFIG =
(uint32_t)(UART_CONFIG_PARITY << UART_CONFIG_PARITY_POS)
| (uint32_t)(UART_CONFIG_HWFC << UART_CONFIG_HWFC_POS);
NRF_UART0->PSEL.RXD = (uint32_t)UART_RX_PIN;
NRF_UART0->PSEL.TXD = (uint32_t)UART_TX_PIN;

// enable UART rx done ready and tx done ready interrupts

NRF_UART0->INTENSET =
(uint32_t)(1<<UART_INTEN_RXDRDY_POS)
| (uint32_t)(1<<UART_INTEN_TXDRDY_POS);

// set priority and enable interrupt in NVIC
NVIC_SetPriority(UARTE0_UART0_IRQn, NRFX_UART_DEFAULT_CONFIG_IRQ_PRIORITY);

NVIC->ISER[((uint32_t)UARTE0_UART0_IRQn)>>5] =
((uint32_t)1) << ( ((uint32_t)UARTE0_UART0_IRQn) & 0x1f);

// enable uart
NRF_UART0->ENABLE = (uint32_t)UART_ENABLE_ENABLE_Enabled;

// start to tx and rx
NRF_UART0->TASKS_STARTTX = (uint32_t)1;
NRF_UART0->TASKS_STARTRX = (uint32_t)1;}

RE: connect to the nRF52840-DK with the STM32F103 development board

Karl Ylvisaker — Mon, 19 Oct 2020 09:25:58 GMT

Hello,

[quote user="kyh-ly"]In the file nrf_gpio.h, I don't find the definition of UART1, can I use the UARTE1 as UART?[/quote]

I do not understand your question here - are you looking for the *_UART* definitions? If so, they are located in your sdk_config.h file.
I would not expect to find any UART related defines or functions in the nrf_gpio.h file, since this is the HAL for the GPIO peripheral.

Please do not hesitate to ask if anything still should be unclear, or if you encounter any other issues or questions!

Best regards,
Karl

RE: connect to the nRF52840-DK with the STM32F103 development board

kyh-ly — Fri, 16 Oct 2020 12:32:40 GMT

In the file nrf_gpio.h, I don't find the definition of UART1, can I use the UARTE1 as UART?

RE: connect to the nRF52840-DK with the STM32F103 development board

kyh-ly — Fri, 16 Oct 2020 08:01:48 GMT

Thanks, I have found the definition of the serialization_application_board. If I can use this port to implement UART communication?

RE: connect to the nRF52840-DK with the STM32F103 development board

Karl Ylvisaker — Wed, 12 Aug 2020 15:00:40 GMT

Hello,

It is as Nguyen said: the nRF52840 does have two UART instances. You can map the UART to any of the available pins on the nRF52840 DK, but please keep the Pin assignment in mind, when choosing pins. If you intend to use the UART then it will be useful to take a look at the UART Example from the SDK, which demonstrates its usage.
You may also pursue using either SPI or TWI as well. Examples that demonstrate both SPI and TWI setup and usage can be seen in the SDK.

I recommend that you start with one of the examples that demonstrates the functionality closest to the one you would like to implement, and then work your way from there.

Please do not hesitate to ask if anything should be unclear, or in the case that you encounter some issues or questions!

Best regards,
Karl

RE: connect to the nRF52840-DK with the STM32F103 development board

Nguyen Hoan Hoang — Wed, 12 Aug 2020 08:24:00 GMT

the nRF52840 has 2 UART. The reason why you don't see a specific pin for it is because any gpio pin can be used for it. You see only 1 uart pin on the DK because it is being used and connected to the onboard jlink. The 2 uart is not used therefore not mapped anywhere.