Hello,
I am working on a project were two MCU's need to communicate with each other via UART. I am using async UART. I am stuck with this problem where after
PM_DEVICE_ACTION_RESUME call the uart_device is in Active state but UART_RX_RDY is not called and I know for sure that there are incoming data. I am probably missing something obvious.
To elaborate a little more about the specifics. The two MCU's are connected via UART and some GPIO's. The idea is that LTE module receives data, suspends UART driver, uplink the received data and go to PSM. To resume the UART device I used one GPIO with interrupt. When the other MCU pulls GPIO high an interrupt fires, resumes the UART device and waits for data. But instead I get UART_RX_STOPPED and UART_RX_DISABLED because the other MCU turned off its UART and now its pulling RX line low.
I tried to uart_rx_enable after the PM_DEVICE_ACTION_RESUME but it returns error as expected because reception was never disabled.
Everything works fine if I remove pm_device_action_run from UART driver and set other MCU to pull the nRF9160 RX pin high instead of low. That's why I am pretty sure that there is something missing in nRF9160 code not on the other MCU
Here are some code snippets how I enable/disable the driver. It's still a bit messy because I was testing what works and what doesn't:
Here are some code snippets how I enable/disable the driver. It's still a bit messy because I was testing what works and what doesn't:
static int gpioCallback(const struct device *dev, struct gpio_callback *cb, uint32_t pins)
{
int err;
err = pm_device_action_run(uart_dev, PM_DEVICE_ACTION_RESUME);
if (err && err != -EALREADY)
{
// LOG_ERR("Call `pm_device_action_run` failed: %d", err);
}
if (!device_is_ready(uart_dev))
{
// LOG_ERR("Device not ready");
}
// LOG_INF("UART waked up");
} case UART_RX_RDY:
size_t offset = evt->data.rx.offset;
size = evt->data.rx.len;
memcpy(rxBuf, &evt->data.rx.buf[offset], size);
// Enable CoAP work to transmit newly received data
k_work_schedule(workCoap, K_NO_WAIT);
err = pm_device_action_run(uart_dev, PM_DEVICE_ACTION_SUSPEND);
if (err && err != -EALREADY)
{
LOG_ERR("Call `pm_device_action_run` failed: %d", err);
}
break;Any ideas?
