Communication between nrf52840 and nrf9160 on thingy 91

[Hamada888]

Hei

I am trying to make SPI or UART communication between nrf9160 and nrf52840 on thingy 91....... i need to send data from nrf52840 to nrf9160(i will use and print the data)
what is the best way to do it? I tried connectivity bridge, but with no hope......

Another small question....i cannot get any thing out on putty when i write printk("hello world"); in the main function in connectivity bridge code ...how to fix it?

[Albrecht Markus Schellenberger]

Hello Mohammad,

you can communicate between the nRF9160 and nRF52840 on the Thingy:91 using MCU_IF.

https://www.nordicsemi.com/-/media/Software-and-other-downloads/Dev-Kits/Thingy91/Hardware-files/Thingy91---Hardware-files-1_5_0.zip

Have a look at “PCA20035_Schematic_And_PCB.pdf” page 2 (nRF91 GPIO pin mapping) & 3 (nRF52 GPIO pin mapping). The instances UART0 and UART1 on both sides are already pre-configured to communicate with each other.

 

Another small question....i cannot get any thing out on putty when i write printk("hello world"); in the main function in connectivity bridge code ...how to fix it?

In the file ../build/zephyr/zephyr.dts you can see that UART0 is used to write to the console. But since the connectivity bridge application doesn’t have a “connectivity bridge” for its own console data, it will not be transmitted from the nRF52840 via USB. Alternatively, you can use RTT to read printk commandos by setting CONFIG_RTT_CONSOLE=y in prj.conf.

 Cheers!

Markus

[Hamada888]

hei
Thanks for your answer

1-
I see that i can use MCU_IF to communicate between nrf91 and nrf52840, and I road that the connectivity bridge has already done it (if i don't misunderstand it) ....but how/ where I will write my code? do you have an example for UART functions? write and read? all I need for now is to send one string between nrf91 and nrf52840 and print it out to putty 

I am using the connectivity bridge on nrf52840 and the asset tracker on nrf9160

2-
I tried CONFIG_RTT_CONSOLE=y on my prj.conf but i still don't get any output, is there anything else i can enable/disable to fix it?

[Hamada888]

Thanks for your answer 
now i dont get the same feil when i use uart0_dev = device_get_binding("UART_0");

but i get another feil (Failed to set callback) 


the code is:

static void async(const struct device *uart0_dev)
{
uint8_t txbuf[5] = {1, 2, 3, 4, 5};
int err;
uint8_t *buf;

err = k_mem_slab_alloc(&uart_slab, (void **)&buf, K_NO_WAIT);
__ASSERT(err == 0, "Failed to alloc slab");

err = uart_callback_set(uart0_dev, uart_callback, (void *)uart0_dev);
__ASSERT(err == 0, "Failed to set callback");  

err = uart_rx_enable(uart0_dev, buf, BUF_SIZE, 10);
__ASSERT(err == 0, "Failed to enable RX");

while (1) {
err = uart_tx(uart0_dev, txbuf, sizeof(txbuf), 10);
__ASSERT(err == 0, "Failed to initiate transmission");

k_sleep(K_MSEC(500));

uart_poll_out(uart0_dev, txbuf[0]);
k_sleep(K_MSEC(100));
}
}

main function:

void main(void)
{
LOG_INF("Asset tracker started");


const struct device *uart0_dev;

k_msleep(1000);
uart0_dev = device_get_binding("UART_0");
//lpuart = device_get_binding("LPUART");
__ASSERT(uart0_dev, "Failed to get the device");

if (IS_ENABLED(CONFIG_NRF_SW_LPUART_INT_DRIVEN)) {
interrupt_driven(uart0_dev);
} else {
async(uart0_dev);
}

I think the feil is from my overlay file:

overlay file:

&uart0 {
compatible = "nordic,nrf-uarte";
status = "okay";
rx-pin = <19>;
tx-pin = <20>;
baudrate = <1000000>;
/delete-property/ rts-pin;
/delete-property/ cts-pin;
/delete-property/ hw-flow-control;
};


prj.conf:

i added to the original prj file

CONFIG_UART_ASYNC_API=y

thanks for your help 

Mohammad