Hello,
I found some some threads on similar questions but none answered mine, so here it is:
I try to use UART between nrf52840 and another chip. When the other chip resets the RX line goes low and I get a drive error callback. I have two questions:
1. Is it possible to configure the RX pin as pullup in order to avoid going low when second chip resets
2. How do I recover from this error. None worked so far.
I attached the relevant code (SDK 15.3)
NRF_SERIAL_DRV_UART_CONFIG_DEF(m_uarte0_drv_config,
NRF_GPIO_PIN_MAP(0, 24), NRF_GPIO_PIN_MAP(0, 22),
RTS_PIN_NUMBER, CTS_PIN_NUMBER,
NRF_UART_HWFC_DISABLED, NRF_UART_PARITY_EXCLUDED,
NRF_UART_BAUDRATE_38400,
UART_DEFAULT_CONFIG_IRQ_PRIORITY);
#define SERIAL_FIFO_TX_SIZE 1024
#define SERIAL_FIFO_RX_SIZE 1024
NRF_SERIAL_QUEUES_DEF(serial0_queues, SERIAL_FIFO_TX_SIZE, SERIAL_FIFO_RX_SIZE);
#define SERIAL_BUFF_TX_SIZE 1
#define SERIAL_BUFF_RX_SIZE 1
NRF_SERIAL_BUFFERS_DEF(serial0_buffs, SERIAL_BUFF_TX_SIZE, SERIAL_BUFF_RX_SIZE);
void My_cdc_acm_user_ev_handler(app_usbd_class_inst_t const *p_inst,
nrfx_uarte_event_t event);
NRF_SERIAL_CONFIG_DEF(serial0_config, NRF_SERIAL_MODE_DMA,
&serial0_queues, &serial0_buffs, My_cdc_acm_user_ev_handler_E10, sleep_handler);
NRF_SERIAL_UART_DEF(serial0_uarte, 0);
void My_cdc_acm_user_ev_handler(app_usbd_class_inst_t const *p_inst,
nrfx_uarte_event_t event)
{
uint32_t error; ret_code_t ret;
switch (event.type)
{
case NRF_SERIAL_EVENT_DRV_ERR:
NRF_LOG_INFO("DRIVE ERROR E10!!!");
if(NRF_UART0->EVENTS_ERROR !=0)
{
error = NRF_UART0->ERRORSRC;
NRF_LOG_INFO("Serial driver err: %d", error);
NRF_UART0->EVENTS_ERROR = 0;
}
nrf_serial_uninit(&serial0_uarte);
ret = nrf_serial_init(&serial0_uarte, &m_uarte0_drv_config, &serial0_config);
break;
}
}
//somewhere while init:
ret = nrf_serial_init(&serial0_uarte, &m_uarte0_drv_config, &serial0_config);
