Other Parts Discussed in Thread: AM2632
Tool/software:
We are having random issues using floating point on the AM2632. The compiler options are set as follows (I removed most of our -I options)
-mcpu=cortex-r5 -mfloat-abi=hard -mfpu=vfpv3-d16 -mlittle-endian -mthumb -I"C:/ti/ccs1281/ccs/tools/compiler/ti-cgt-armllvm_4.0.1.LTS/include/c" -I"C:/ti/mcu_plus_sdk_am263x_10_01_00_31/source" -I"C:/ti/mcu_plus_sdk_am263x_10_01_00_31/source/drivers/uart/v0" -I"C:/ti/mcu_plus_sdk_am263x_10_01_00_31/source/drivers/soc/am263x" -I"C:/ti/mcu_plus_sdk_am263x_10_01_00_31/source/kernel/freertos/FreeRTOS-Kernel/include" -I"C:/ti/mcu_plus_sdk_am263x_10_01_00_31/source/kernel/freertos/portable/TI_ARM_CLANG/ARM_CR5F" -I"C:/ti/mcu_plus_sdk_am263x_10_01_00_31/source/kernel/freertos/config/am263x/r5f" -I"C:/ti/mcu_plus_sdk_am263x_10_01_00_31/source/kernel/dpl" -DSOC_AM263X -D_DEBUG_=1 -g -Wall -Wno-gnu-variable-sized-type-not-at-end -Wno-unused-function -I"C:/projects/slate/firmware/AX-BMSC-Debug/syscfg"
We are building using Code Composer and C:/ti/ccs1281/ccs/tools/compiler/ti-cgt-armllvm_4.0.1.LTS/bin/tiarmclang.exe
Some code in question is below:
uint32_t uiVoltage;
double fVoltage;
uiVoltage = 3500;
fVoltage = (double)uiVoltage * (double)100;
fVoltage = fVoltage / (double)1000;
The error occurs randomly in that the computed fVoltage on the last line is incorrect. The only thing I can think of is that floating point registers are not being preserved across interrupts and thus corrupting random calculations. I can not find any settings for this in the compiler options, nor syscfg. Are there any that I am missing? We are using FreeRTOS- is it a FreeRTOS configuration item? This one has me totally stumped.
I have detected the error in the debugger and looked at the value for uiVoltage and it is correct, yet the resultant fVoltage is not.
Thanks for any insight.
