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UART for NRF51822 on "old" nrf pins ?

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Fri, 2019-11-29 16:41

#1

CTSchorsch

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UART for NRF51822 on "old" nrf pins ?

Hi Benjamin,

first thanks for your great work, i really like your project.

one (more) question from my side: do you think it is possible to connect a NRF51822 modul on the pins where you connect th nrf24l01 in your vesc 6 schematic ?

so the normal uart will be free for debug and other use

Thanks

Georg

Wed, 2019-12-04 12:06

#2

benjamin

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It is possible, that is actually done on the 75/300 already and the next revision of the V6. I added support for that in the firmware a while ago.

Thu, 2019-12-05 21:02

#3

CTSchorsch

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Hi Benjamin,

thanks for your answer. This sounds good. Can you give me a hint, how to activate it ? I'm still not good in understanding the whole code. I'm more the hardware guy :)

Georg

Fri, 2019-12-06 10:26

#4

CTSchorsch

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i just tried a copy/paste approach and added so following defines to my hw conf, but it is not working

// Permanent UART Peripheral (for NRF51)

#define HW_UART_P_BAUD          115200

#define HW_UART_P_DEV           SD4

#define HW_UART_P_GPIO_AF       GPIO_AF_UART4

#define HW_UART_P_TX_PORT       GPIOB

#define HW_UART_P_TX_PIN        3

#define HW_UART_P_RX_PORT       GPIOB

#define HW_UART_P_RX_PIN        4

#endif

I saw that most of the hardware use GPIOC for the permanent uart, but this ports are used for the DRV on HW6. Is it possible to start a uart on every GPIO ?

Mon, 2019-12-09 21:09

#5

CTSchorsch

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okay, found out myself :)

my pins has no UART as alternate pin function

i use now pins from the hall-sensor connector. i have a sensorless motor and this pins are free

thanks

Georg

Tue, 2022-08-16 09:06

(Reply to #5) #6

hl0dk0

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I saw your post and I want to implement same solution.

Did you manage to make it work?

Is there any more code to change?

What pins did you use?

Tue, 2022-08-16 12:42

#7

hl0dk0

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I fugured it out.

had to put:

// Permanent UART Peripheral (for NRF51)
#define HW_UART_P_BAUD			115200
#define HW_UART_P_DEV			SD6
#define HW_UART_P_GPIO_AF		GPIO_AF_USART6
#define HW_UART_P_TX_PORT		GPIOC
#define HW_UART_P_TX_PIN		6
#define HW_UART_P_RX_PORT		GPIOC
#define HW_UART_P_RX_PIN		7

into hw_XXX.h

and change this two.

// Hall/encoder pins
#define HW_HALL_ENC_GPIO1		GPIOC
//#define HW_HALL_ENC_PIN1		6
#define HW_HALL_ENC_PIN1		10
#define HW_HALL_ENC_GPIO2		GPIOC
//#define HW_HALL_ENC_PIN2		7
#define HW_HALL_ENC_PIN2		11

than I just had to work out which HAL input is RX an which is TX.

IT WORKS