質問編集履歴
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問題の原因がマイコンにあったため、マイコンの種類を追記しました。
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math.hのcos関数に変数を代入して計算させると戻り値が常に0.00になってしまい、目的の計算プログラムが機能しなくなり困っています。
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cos(-4.96)が0.25を返しているのでcos関数自体は機能しているはずですし、Serial.print(angle_rad)でまともな数字を表示していますし、さっぱり何が原因であるのかがわかりません。
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###動作環境
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マイコンボード：GR-Citrus
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開発環境：IDE for GR v1.13
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### 発生している問題・エラーメッセージ
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コンパイルエラーなどは出ませんでした。
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コンパイラオプションを載せました
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// (中略 変数angle_radへの代入はない)
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Serial.print(angle_rad); // -4.96と表示
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Serial.print(cos(angle_rad)); // 0.25と表示（合っている）
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```
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### おそらくコンパイルオプション
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```platform.txt
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# RX63N and platform.
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# ------------------------------
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# For more info:
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name=Renesas RX63
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#version=2.2.0
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# AVR compile variables
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# ---------------------
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# Default "compiler.path" is correct, change only if you want to overidde the initial value
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compiler.path={runtime.ide.path}/hardware/tools/gcc-rx/rx-elf/rx-elf/bin/
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compiler.ar.path = {runtime.ide.path}/hardware/arduino/rx63/cores/
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compiler.c.cmd=rx-elf-gcc
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compiler.c.flags=-Wall -ffunction-sections -fno-function-cse -fsigned-char -fdata-sections -mno-balign -DARDUINO=100 -DCPPAPP -D__RX_LITTLE_ENDIAN__=1 -D__T4__ -O2 -flto -mlittle-endian-data -mcpu=rx600 -Ihardware/arduino/rx63/cores/ -Ihardware/arduino/rx63/cores/core -Ihardware/arduino/rx63/cores/core/avr -Ihardware/arduino/rx63/cores/lib -Ihardware/arduino/rx63/libraries/DSP -Ihardware/arduino/rx63/libraries/DSP/utility -Ihardware/arduino/rx63/libraries/EEPROM -Ihardware/arduino/rx63/libraries/EEPROM/utility -Ihardware/arduino/rx63/libraries/Ethernet -Ihardware/arduino/rx63/libraries/Ethernet/utility -Ihardware/arduino/rx63/libraries/Ethernet/utility/driver -Ihardware/arduino/rx63/libraries/Ethernet/utility/r_byteq_v1.30 -Ihardware/arduino/rx63/libraries/Ethernet/utility/r_config -Ihardware/arduino/rx63/libraries/Ethernet/utility/T4_src -Ihardware/arduino/rx63/libraries/Ethernet/utility/T4_src/checksum -Ihardware/arduino/rx63/libraries/Ethernet/utility/T4_src/checksum/rx -Ihardware/arduino/rx63/libraries/Firmata -Ihardware/arduino/rx63/libraries/LiquidCrystal -Ihardware/arduino/rx63/libraries/MsTimer2 -Ihardware/arduino/rx63/libraries/RTC -Ihardware/arduino/rx63/libraries/RTC/utility -Ihardware/arduino/rx63/libraries/SD -Ihardware/arduino/rx63/libraries/SD/utility -Ihardware/arduino/rx63/libraries/Servo -Ihardware/arduino/rx63/libraries/SoftwareSerial -Ihardware/arduino/rx63/libraries/SPI -Ihardware/arduino/rx63/libraries/Stepper -Ihardware/arduino/rx63/libraries/Wire -Ihardware/arduino/rx63/libraries/Wire/utility -Ihardware/arduino/rx63/cores/rx63n -Ihardware/arduino/rx63/libraries/ArduinoJson -Ihardware/arduino/rx63/libraries/postParser -Ihardware/arduino/rx63/libraries/PubSubClient -Ihardware/arduino/rx63/libraries/WavMp3p -Ihardware/arduino/rx63/libraries/WavMp3p/utility -Ihardware/arduino/rx63/libraries/WiFiEsp -Ihardware/arduino/rx63/libraries/WiFiEsp/utility -Ihardware/arduino/rx63/libraries/AdafruitGFX
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compiler.S.cmd=rx-elf-gcc
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compiler.S.flags= -ffunction-sections -fno-function-cse -fsigned-char -fdata-sections -mno-balign -DARDUINO=100 -DCPPAPP -D__RX_LITTLE_ENDIAN__=1 -D__T4__ -O2 -mlittle-endian-data -mcpu=rx600
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compiler.elf2hex.flags=-O binary
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#compiler.elf2hex.flags=-O srec
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compiler.elf2hex.cmd=rx-elf-objcopy
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compiler.c.elf.cmd=rx-elf-ld
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compiler.c.elf.flags=
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compiler.ar.cmd=rx-elf-ar
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compiler.ar.flags=rcs
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compiler.ld.flags= -e_PowerON_Reset -no-keep-memory -S
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compiler.size.cmd=rx-elf-size
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# this can be overriden in boards.txt
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build.extra_flags=
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# AVR compile patterns
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# --------------------
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## Compile c files
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recipe.c.o.pattern="{compiler.path}{compiler.c.cmd}" -std=gnu99 {includes} {compiler.c.flags} {build.extra_flags} -c -x c "{source_file}" -o "{object_file}"
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## Compile c++ files
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recipe.cpp.o.pattern="{compiler.path}{compiler.c.cmd}" -std=gnu++11 {includes} {compiler.c.flags} {build.extra_flags} -c -x c++ "{source_file}" -o "{object_file}"
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## Compile S files
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recipe.S.o.pattern="{compiler.path}{compiler.c.cmd}" {includes} {compiler.S.flags} -c -x assembler-with-cpp "{source_file}" -o "{object_file}"
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## Create archives
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recipe.ar.pattern="{compiler.path}{compiler.ar.cmd}" {compiler.ar.flags} "{build.path}/{archive_file}" "{object_file}"
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## for rapid compile
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## Combine gc-sections, archives, and objects
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recipe.c.combine.pattern="{compiler.path}{compiler.c.elf.cmd}" {compiler.ld.flags} "-T{build.variant.path}/{build.ldscript}" {object_files} --whole-archive "{build.variant.path}/gr_common.a" --no-whole-archive "-L{build.path}" "{build.path}/{archive_file}" -o "{build.path}/{build.project_name}.elf" "-L{runtime.ide.path}/hardware/tools/gcc-rx/rx-elf/rx-elf/rx-elf/lib/64-bit-double" "-L{runtime.ide.path}/hardware/tools/gcc-rx/rx-elf/rx-elf/lib/gcc/rx-elf/4.8.4.201801-GNURX/64-bit-double" --no-flag-mismatch-warnings --start-group -lstdc++ -lnosys -lsim -lm -lc -lgcc --end-group
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## Create eeprom
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recipe.objcopy.eep.pattern=
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## Create hex
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recipe.objcopy.hex.pattern="{compiler.path}{compiler.elf2hex.cmd}" {compiler.elf2hex.flags} "{build.path}/{build.project_name}.elf" "{build.path}/{build.project_name}.bin"
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## Compute size
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recipe.size.pattern="{compiler.path}{compiler.size.cmd}" -A "{build.path}/{build.project_name}.elf"
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recipe.size.regex=^(?:.text|.data|.bootloader)\s+([0-9]+).*
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recipe.size.regex.data=^(?:.data|.bss|.noinit)\s+([0-9]+).*
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recipe.size.regex.eeprom=^(?:.eeprom)\s+([0-9]+).*
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# SAM3 Uploader tools
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# -------------------
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tools.savesketch.cmd=SaveSketch
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tools.savesketch.cmd.windows=SaveSketch.bat
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tools.savesketch.path={runtime.ide.path}/hardware/tools/rx
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tools.savesketch.upload.params.verbose=
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tools.savesketch.upload.params.quiet=
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tools.savesketch.upload.pattern="{path}/{cmd}" "{name}" "{build.path}\{build.project_name}.bin"
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```
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