Hi,
I am currently trying to convert a double value to char array. But looks like there is a time that my conversion works properly, and also there is a time that I got wrong result, like the result is 0.00000 or something like that.
So below is my proj.conf
# # Copyright (c) 2021 Nordic Semiconductor ASA # # SPDX-License-Identifier: LicenseRef-Nordic-5-Clause # # General config CONFIG_FPU=y CONFIG_NEWLIB_LIBC=y CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y CONFIG_NRF_MODEM_LIB=y # Heap and stacks CONFIG_MAIN_STACK_SIZE=2048 # Extended memory heap size needed for encoding REST messages to JSON CONFIG_HEAP_MEM_POOL_SIZE=8192 CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=1536 # Increase AT monitor heap because %NCELLMEAS notifications can be large CONFIG_AT_MONITOR_HEAP_SIZE=512 # Location library CONFIG_LOCATION=y # Logging CONFIG_LOG=y CONFIG_LOG_MODE_IMMEDIATE=y CONFIG_RTT_CONSOLE=y CONFIG_USE_SEGGER_RTT=y CONFIG_LOG_BACKEND_RTT=y # MQTT CONFIG_MQTT_LIB=y CONFIG_MQTT_LIB_TLS=n CONFIG_MQTT_CLEAN_SESSION=y CONFIG_PDN=y CONFIG_PDN_LEGACY_PCO=y CONFIG_NET_SOCKETS_POSIX_NAMES=y # Network CONFIG_NETWORKING=y CONFIG_NET_NATIVE=n CONFIG_NET_SOCKETS=y CONFIG_NET_SOCKETS_OFFLOAD=y # LTE link control CONFIG_LTE_LINK_CONTROL=y CONFIG_LTE_NETWORK_MODE_NBIOT_GPS=y CONFIG_LTE_AUTO_INIT_AND_CONNECT=n CONFIG_LTE_EDRX_REQ=y # Request PSM active time of 8 seconds. CONFIG_LTE_PSM_REQ_RAT="00000100" # AT Host library - Used to send AT commands directy from an UART terminal and to allow # integration with nRF Connect for Desktop LTE Link monitor application. CONFIG_UART_INTERRUPT_DRIVEN=y CONFIG_AT_HOST_LIBRARY=y # nRF Cloud (for A-GPS and cell location) CONFIG_NRF_CLOUD_REST=y CONFIG_NRF_CLOUD_AGPS=y CONFIG_NRF_CLOUD_CLIENT_ID_SRC_COMPILE_TIME=y CONFIG_NRF_CLOUD_CLIENT_ID="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" CONFIG_MODEM_INFO=y # required by CONFIG_NRF_CLOUD_AGPS CONFIG_MODEM_INFO_ADD_NETWORK=y # required by CONFIG_NRF_CLOUD_AGPS # Library that maintains the current date time UTC for A-GPS and P-GPS purposes CONFIG_DATE_TIME=y # Modem JWT CONFIG_MODEM_JWT=y # HWID CONFIG_HW_ID_LIBRARY=y CONFIG_HW_ID_LIBRARY_SOURCE_DEVICE_ID=y # Multicell location service selection CONFIG_MULTICELL_LOCATION_SERVICE_NRF_CLOUD=y
So below is part of my code which is trying to convert double to a char array.
printk("Publishing location using ");
printk("cellular service.\n");
printk("Publishing longitude %f ", event_data->location.longitude);
sprintf(temp_lon, " %f ", event_data->location.longitude);
printk("value : %s ", temp_lon);
err = data_publish(&client, MQTT_QOS_1_AT_LEAST_ONCE, temp_lon, sizeof(temp_lon), TOPIC_LOC_CELLULER_LON);
if (err) {printk("ERR data_publish (longitude) : %d", err);} else {printk(" -- success.\n");}
printk("Publishing latitude %f ", event_data->location.latitude);
sprintf(temp_lat, " %f ", event_data->location.latitude);
printk("value : %s ", temp_lat);
err = data_publish(&client, MQTT_QOS_1_AT_LEAST_ONCE, temp_lat, sizeof(temp_lat), TOPIC_LOC_CELLULER_LAT);
if (err) {printk("ERR data_publish (longitude) : %d", err);} else {printk(" -- success.\n");}
printk("Publishing both information ");
sprintf(temp_all, " %f,%f ", event_data->location.latitude, event_data->location.longitude);
printk("value : %s ", temp_all);
err = data_publish(&client, MQTT_QOS_1_AT_LEAST_ONCE, temp_all, sizeof(temp_all), TOPIC_LOC_CELLULER);
if (err) {printk("ERR data_publish (both) : %d", err);} else {printk(" -- success.\n");}
So from my code, as you can see, I print double value first then print again converted value (as char array). But when I check on rtt, the result is 0.000000. Below is the result that I receive using rtt.
Publishing Location using cellular service. Publishing longitude 46.69XXXX value : 0.000000 -- success. Publishing latitude 24.79XXXX value : 0.000000 -- success. Publishing both information value : 0.000000,46.69XXXX -- success. Requesting location with the default configuration...
I edit a little location by using X as mark to do censorship on location.
Anyway, that is the issue that I got when using sprintf. Anybody have an idea about this? thank you so much for your help, really appreciate.
