Hi there,
several months ago I developed a usb to uart bridge based on the nRF52820. We've produced a hand full of those bridges for internal tests and the feedback showed some problems.
Right now the biggest problem is that sometimes the bridge stops responding when hitting it with a load from both sides. Right now DEBUG is set so an error results in an endless loop instead of a reset
So far I figured out that the problem lies within the nrf_libuarte_async_rx_free function. Here I run into the "Unexpected RX free input parameter" case. Debugging it shows that rx_free_cnt is 499968 and rx_buf_size is 0 ...
Here is my init function:
#define UART_RX_BUF_SIZE 256
#define UART_RX_BUF_NUM 8
#define UART_RX_PIN_NUMBER 30
#define UART_TX_PIN_NUMBER 29
#define UART_RX_TIMEOUT_US 100
NRF_LIBUARTE_ASYNC_DEFINE(libuarte, 0, 0, 0, 3, UART_RX_BUF_SIZE, UART_RX_BUF_NUM);
void uart_init(UART_init_struct_t* psInit)
{
ret_code_t err_code;
nrf_libuarte_async_config_t nrf_libuarte_async_config;
nrf_libuarte_async_config.tx_pin = UART_TX_PIN_NUMBER;
nrf_libuarte_async_config.rx_pin = UART_RX_PIN_NUMBER;
nrf_libuarte_async_config.baudrate = NRF_UARTE_BAUDRATE_1000000;
nrf_libuarte_async_config.parity = NRF_UARTE_PARITY_EXCLUDED;
nrf_libuarte_async_config.timeout_us = UART_RX_TIMEOUT_US;
nrf_libuarte_async_config.int_prio = APP_IRQ_PRIORITY_HIGH;
nrf_libuarte_async_config.pullup_rx = true;
nrf_libuarte_async_config.rts_pin = UART_PIN_DISCONNECTED;
nrf_libuarte_async_config.cts_pin = UART_PIN_DISCONNECTED;
nrf_libuarte_async_config.hwfc = NRF_UARTE_HWFC_DISABLED;
nrf_libuarte_async_uninit(&libuarte);
err_code = nrf_libuarte_async_init(&libuarte, &nrf_libuarte_async_config, uart_event_handler, (void*)&libuarte);
if(err_code != NRF_SUCCESS)
NRF_LOG_ERROR("libuarte async init = %d", err_code);
APP_ERROR_CHECK(err_code);
nrf_libuarte_async_enable(&libuarte);
}
The uart events get handled via the scheduler:
static void uart_event_sched_handler(void* p_event_data, uint16_t event_size)
{
nrf_libuarte_async_evt_t* p_evt = (nrf_libuarte_async_evt_t*) p_event_data;
switch(p_evt->type)
{
case NRF_LIBUARTE_ASYNC_EVT_RX_DATA:
{
u8* pu8Data;
u32 i;
for(i = 0, pu8Data = p_evt->data.rxtx.p_data; i < p_evt->data.rxtx.length; i++, pu8Data++)
{
UART_RxProcess(*pu8Data);
}
nrf_libuarte_async_rx_free(&libuarte, p_evt->data.rxtx.p_data, p_evt->data.rxtx.length);
break;
}
case NRF_LIBUARTE_ASYNC_EVT_TX_DONE:
{
UART_Tx(NULL, 0);
break;
}
case NRF_LIBUARTE_ASYNC_EVT_ERROR:
{
NRF_LOG_INFO("UART Error: %d", p_evt->data.errorsrc);
break;
}
default:
NRF_LOG_INFO(" unexpected libuarte event: %d", p_evt->type);
break;
}
}
void uart_event_handler(void* context, nrf_libuarte_async_evt_t* p_evt)
{
app_sched_event_put(p_evt, sizeof(nrf_libuarte_async_evt_t), uart_event_sched_handler);
}
I'm using the nRF5 SDK version 17.1.0 without softdevice.
Any idea what the problem could be?
Kind regards,
Johannes
