Can i configure SWDIO and SWDCLK to I2C pin?

RE: Can i configure SWDIO and SWDCLK to I2C pin?

Nguyen Hoan Hoang — Tue, 19 Jan 2021 03:47:45 GMT

goto see the int the SDK examples/peripheral/twi_sensor

RE: Can i configure SWDIO and SWDCLK to I2C pin?

Quangca — Tue, 19 Jan 2021 03:25:57 GMT

I check the pca10056.h on PCA10056e apps(for nRF52811 chip). But can't find I2c or TWI pin define.

Are these define correct for I2C pin in pca10056.h ?

// Arduino board mappings
#define ARDUINO_SCL_PIN 27 // SCL signal pin
#define ARDUINO_SDA_PIN 26 // SDA signal pin

Can you help me, where I2c or TWI pin defined?

thanks.

RE: Can i configure SWDIO and SWDCLK to I2C pin?

Nguyen Hoan Hoang — Mon, 18 Jan 2021 04:03:00 GMT

Unlike other MCU, the nRF series GPIO pin are totally programmable. Any pin can be configured to be used by any peripherals such as I2C, SPI, UART, ... Except a a few dedicated one such as the SWD. However, I don't recommend using NFC and reset pins as GPIO.

RE: Can i configure SWDIO and SWDCLK to I2C pin?

Quangca — Mon, 18 Jan 2021 01:44:32 GMT

Thanks Hoàng.

I understand. May be i need make new PCB :(

By the way, i check nRF52811 don't have Hw internal configure for I2C.

Datasheet also said that: "The TWI master is compatible with I2 C operating at 100 kHz and 400 kHz ".

It seem we can define GPIO for I2C pin by firmware, right?

But check on pca10056.h, can't find I2c or TWI pin define.

Do you know BLE peripheral example using I2C for nRF52811?

RE: Can i configure SWDIO and SWDCLK to I2C pin?

Nguyen Hoan Hoang — Sun, 17 Jan 2021 15:17:55 GMT

SWD pins are dedicated pins, cannot be remapped.

You can have multiple devices on the same I2C pins only requirement is that each device has a different I2C 7bits address.