Hello,
I'm trying to see serial data (polling async method) coming from a single-wire signal. I have verified via an oscilloscope that there is indeed data on that wire. However I when I plug the wire into the GPIO Rx (for both UART0 and UART2), I see nothing triggering the callback that RX is ready. There is no flow control
Here are the specifics:
From Uart.C:
void uart_callback(const struct device *dev,
struct uart_event *evt,
void *user_data)
{
struct device *uart = user_data;
int err;
switch (evt->type) {
case UART_TX_DONE:
//printk("Tx sent %d bytes\n", evt->data.tx.len);
break;
case UART_TX_ABORTED:
printk("Error: Tx aborted\n\r");
break;
case UART_RX_RDY: {
struct uart_event_rx *pRX = &evt->data.rx;
size_t length = 0;
size_t offset = 0;
struct event_item event = { 0 };
event.data = NULL;
event.uart = uart;
offset = pRX->offset;
length = pRX->len;
printk("Received %d bytes (%s)\n\r", pRX->len, (const char *)&pRX->buf[offset]);
#if 0
event.data = k_calloc(length, 1);
memcpy(event.data, (char *)&pRX->buf[offset], length - 1);
//printk("Received data %d bytes (%s)\n", length - 1, (char *)event.data);
err = k_msgq_put(&event_msgq, &event, K_NO_WAIT);
if (err) {
/* Failed to put event into queue */
k_free(event.data);
}
#endif
break;
}
case UART_RX_BUF_REQUEST:
{
uint8_t *buf;
//printk("allocating memory\n");
err = k_mem_slab_alloc(&uart_slab, (void **)&buf, K_NO_WAIT);
__ASSERT(err == 0, "Failed to allocate slab");
//printk("setting up buffer response.\n");
err = uart_rx_buf_rsp(uart, buf, BUF_SIZE);
__ASSERT(err == 0, "Failed to provide new buffer");
break;
}
case UART_RX_BUF_RELEASED:
//printk("Releasing memory");
k_mem_slab_free(&uart_slab, (void **)&evt->data.rx_buf.buf);
break;
case UART_RX_DISABLED:
printk("Rx Disabled.\n");
break;
case UART_RX_STOPPED:
printk("Rx Stopped.\n");
break;
}
}
From prj.conf:
CONFIG_THREAD_MONITOR=y CONFIG_NRF_MODEM_LIB=y # implies CONFIG_NET_SOCKETS_OFFLOAD=y CONFIG_NRF_MODEM_LIB_SYS_INIT=n # The application will take care of initializing Modem in main.c CONFIG_NETWORKING=y CONFIG_NET_SOCKETS=y # Will provide BSD name support. e.g. setsockopt() instead of nrf_setsockopt() CONFIG_NET_SOCKETS_POSIX_NAMES=y CONFIG_NET_NATIVE=n # We are using socket offload, so set this to no CONFIG_BUILD_WITH_TFM=y # Memory size for k_malloc() CONFIG_HEAP_MEM_POOL_SIZE=4096 # 4096 is the default CONFIG_MAIN_STACK_SIZE=8192 CONFIG_MODEM_KEY_MGMT=y # Application wants to make calls to store keys CONFIG_LTE_LINK_CONTROL=y # Enable the API's to setup and configure the LTE link CONFIG_LTE_AUTO_INIT_AND_CONNECT=n # The application will take care of initializing the LTE stuff in main.c CONFIG_NEWLIB_LIBC=y # Use the "new" libc CONFIG_SAMPLE_TFM_MBEDTLS=y CONFIG_CJSON_LIB=y CONFIG_HTTP_CLIENT=y # MbedTLS and security CONFIG_NORDIC_SECURITY_BACKEND=y # Required when commenting out BUILD_WITH_TFM CONFIG_MBEDTLS_VANILLA_BACKEND=y CONFIG_NET_SOCKETS_SOCKOPT_TLS=y CONFIG_NET_SOCKETS_OFFLOAD_TLS=n CONFIG_MBEDTLS_ENABLE_HEAP=y CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN=8192 CONFIG_MBEDTLS_HEAP_SIZE=44000 CONFIG_MBEDTLS_TLS_LIBRARY=y CONFIG_MBEDTLS_PKCS1_V15=y CONFIG_MBEDTLS_RSA_C=y CONFIG_MBEDTLS=y # Required when commenting out CONFIG_NORDIC_SECURITY_BACKEND CONFIG_LOG=n CONFIG_USE_SEGGER_RTT=y CONFIG_RTT_CONSOLE=y CONFIG_UART_CONSOLE=n # Event management which handles network-related events (like ip address change, or net iface up/down for examples) # CONFIG_NET_MGMT=y # CONFIG_NET_MGMT_EVENT=y # CONFIG_NET_SOCKETS_NET_MGMT=y
From the conf and overlay files:
/* SPDX-License-Identifier: LicenseRef-Nordic-5-Clause */
&uart2 {
compatible = "nordic,nrf-uarte";
reg = < 0xa000 0x1000 >;
interrupts = < 0xa 0x1 >;
status = "okay";
label = "UART_2";
current-speed = < 0x1C200 >;
tx-pin = < 0x00 >;
rx-pin = < 0x01 >;
/delete-property/ rts-pin;
/delete-property/ cts-pin;
/delete-property/ hw-flow-control;
};
&uart1 {
status = "disabled";
};
// &gpiote {
// interrupts = <13 NRF_DEFAULT_IRQ_PRIORITY>;
// };
CONFIG_TFM_SECURE_UART1=n CONFIG_UART_ASYNC_API=y CONFIG_UART_2_ASYNC=y CONFIG_UART_2_INTERRUPT_DRIVEN=n CONFIG_UART_2_NRF_HW_ASYNC=y CONFIG_UART_2_NRF_HW_ASYNC_TIMER=2 CONFIG_NRFX_TIMER2=y CONFIG_RESET_ON_FATAL_ERROR=n CONFIG_TRUSTED_EXECUTION_NONSECURE=y
And for UART2 What is the GPIO config? In one part it reads Rx is PIN 0. In another part it reads Tx is PIN 1.
Please help.
Thanks
/Loren
