Forums - QCA4020 Enabling floating point

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QCA4020 Enabling floating point
Join Date: 29 Jul 19
Posts: 5
Posted: Thu, 2019-11-14 03:19


We try to use floating point calculations on a QCA4020 board, but it still crashes at double conversions.

Q1: Are the floating point calculations enabled on the QCA4020 board? If, not how can we enable it?

Best regards,


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Join Date: 18 Jun 18
Location: San Jose
Posts: 300
Posted: Thu, 2019-11-14 10:39
1> In order for a thread to use floating point, you must call qurt_thread_set_fp_enable(). 
For example, you can insert this before your first use of floating point in a thread: 
qurt_thread_set_fp_enable(qurt_thread_get_id(), true); 
2> For floating operations in some cases, NEWLIBPATH and TOOLLIBPATH need to be set as below based on your toolchain path. 
SET NEWLIBPATH=C:\Workspace\Quartz\gcc-arm-none-eabi-6-2017-q1-update-win32\arm-none-eabi\lib\thumb\v7e-m\fpv4-sp\hard 
SET TOOLLIBPATH=C:\Workspace\Quartz\gcc-arm-none-eabi-6-2017-q1-update-win32\lib\gcc\arm-none-eabi\6.3.1\thumb\v7e-m\fpv4-sp\hard 
Demo Example:
#include "qurt_thread.h" 
qurt_thread_set_fp_enable(qurt_thread_get_id(), true); 
QCLI_Printf(qcli_handle,"start of function\n"); 
float val; 
double val1 = 4, val2 = 2, val3 =1.6, result; 
char str[20]; 
strcpy(str, "98993489"); 
val = atof(str); 
QCLI_Printf(qcli_handle,"String value = %s, Float value = %f\n", str, val); 
// Character array to be parsed and end pointer
char array[] = "365.25 7.0"; 
char* pend; 
//storing float value 
float f1 = strtof(array, &pend); 
float f2 = strtof(pend, NULL); 
QCLI_Printf(qcli_handle," One year has %.2f weeks \n", f1 / f2); 
The result on Console is as below. 
Net: start of function 
Net: String value = 98993489, Float value = 98993488.000000 
Net: One year has 52.18 weeks 
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