This sketch compiles acceptably on Uno, but ESP8266 compilation fails --
byte gamma [256] redeclared as different kind of entity
Changing declarations from byte to int didn't help.
const byte led = 2; // the PWM pin the LED is attached to
byte brightness; // how bright the LED is
byte dwell;
byte gamma [256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2,
2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5,
5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10,
10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16,
17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 25,
25, 26, 27, 27, 28, 29, 29, 30, 31, 32, 32, 33, 34, 35, 35, 36,
37, 38, 39, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 50,
51, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68,
69, 70, 72, 73, 74, 75, 77, 78, 79, 81, 82, 83, 85, 86, 87, 89,
90, 92, 93, 95, 96, 98, 99,101,102,104,105,107,109,110,112,114,
115,117,119,120,122,124,126,127,129,131,133,135,137,138,140,142,
144,146,148,150,152,154,156,158,160,162,164,167,169,171,173,175,
177,180,182,184,186,189,191,193,196,198,200,203,205,208,210,213,
215,218,220,223,225,228,231,233,236,239,241,244,247,249,252,255};
void setup()
{
pinMode(led, OUTPUT);
dwell = 5;
}
void loop()
{
for (brightness = 31; brightness < 248; brightness ++)
{
commonfunc();
}
for (brightness = 248; brightness > 31; brightness --)
{
commonfunc();
}
}
void commonfunc ()
{
analogWrite(led, gamma[brightness]);
delay(dwell);
}
The bad news --
Compiling sketch...
"C:\\Users\\jacob\\AppData\\Local\\Arduino15\\packages\\esp8266\\tools\\python3\\3.7.2-post1/python3" -I "C:\\Users\\jacob\\AppData\\Local\\Arduino15\\packages\\esp8266\\hardware\\esp8266\\3.1.2/tools/signing.py" --mode header --publickey "C:\\sketchbook\\ESPgammaLED_prime/public.key" --out "C:\\Users\\jacob\\AppData\\Local\\Temp\\arduino_build_913533/core/Updater_Signing.h"
"C:\\Users\\jacob\\AppData\\Local\\Arduino15\\packages\\esp8266\\tools\\xtensa-lx106-elf-gcc\\3.1.0-gcc10.3-e5f9fec/bin/xtensa-lx106-elf-g++" -D__ets__ -DICACHE_FLASH -U__STRICT_ANSI__ -D_GNU_SOURCE -DESP8266 "@C:\\Users\\jacob\\AppData\\Local\\Temp\\arduino_build_913533/core/build.opt" "-IC:\\Users\\jacob\\AppData\\Local\\Arduino15\\packages\\esp8266\\hardware\\esp8266\\3.1.2/tools/sdk/include" "-IC:\\Users\\jacob\\AppData\\Local\\Arduino15\\packages\\esp8266\\hardware\\esp8266\\3.1.2/tools/sdk/lwip2/include" "-IC:\\Users\\jacob\\AppData\\Local\\Arduino15\\packages\\esp8266\\hardware\\esp8266\\3.1.2/tools/sdk/libc/xtensa-lx106-elf/include" "-IC:\\Users\\jacob\\AppData\\Local\\Temp\\arduino_build_913533/core" -c "@C:\\Users\\jacob\\AppData\\Local\\Arduino15\\packages\\esp8266\\hardware\\esp8266\\3.1.2/tools/warnings/extra-cppflags" -Os -g -free -fipa-pta -Werror=return-type -mlongcalls -mtext-section-literals -fno-rtti -falign-functions=4 -std=gnu++17 -MMD -ffunction-sections -fdata-sections -fno-exceptions -DMMU_IRAM_SIZE=0x8000 -DMMU_ICACHE_SIZE=0x8000 -DNONOSDK22x_190703=1 -DF_CPU=80000000L -DLWIP_OPEN_SRC -DTCP_MSS=536 -DLWIP_FEATURES=1 -DLWIP_IPV6=0 -DARDUINO=10819 -DARDUINO_ESP8266_NODEMCU_ESP12E -DARDUINO_ARCH_ESP8266 "-DARDUINO_BOARD=\"ESP8266_NODEMCU_ESP12E\"" "-DARDUINO_BOARD_ID=\"nodemcuv2\"" -DLED_BUILTIN=2 -DFLASHMODE_DIO "-IC:\\Users\\jacob\\AppData\\Local\\Arduino15\\packages\\esp8266\\hardware\\esp8266\\3.1.2\\cores\\esp8266" "-IC:\\Users\\jacob\\AppData\\Local\\Arduino15\\packages\\esp8266\\hardware\\esp8266\\3.1.2\\variants\\nodemcu" "C:\\Users\\jacob\\AppData\\Local\\Temp\\arduino_build_913533\\sketch\\ESPgammaLED_prime.ino.cpp" -o "C:\\Users\\jacob\\AppData\\Local\\Temp\\arduino_build_913533\\sketch\\ESPgammaLED_prime.ino.cpp.o"
ESPgammaLED_prime:7:16: error: 'byte gamma [256]' redeclared as different kind of entity
7 | byte gamma [256] = {
| ^
In file included from c:\users\jacob\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\3.1.0-gcc10.3-e5f9fec\xtensa-lx106-elf\include\c++\10.3.0\cmath:45,
from c:\users\jacob\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\3.1.0-gcc10.3-e5f9fec\xtensa-lx106-elf\include\c++\10.3.0\math.h:36,
from C:\Users\jacob\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\cores\esp8266/Arduino.h:34,
from C:\Users\jacob\AppData\Local\Temp\arduino_build_913533\sketch\ESPgammaLED_prime.ino.cpp:1:
c:\users\jacob\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\3.1.0-gcc10.3-e5f9fec\xtensa-lx106-elf\include\math.h:337:15: note: previous declaration 'double gamma(double)'
337 | extern double gamma (double);
| ^~~~~
C:\sketchbook\ESPgammaLED_prime\ESPgammaLED_prime.ino: In function 'void commonfunc()':
C:\sketchbook\ESPgammaLED_prime\ESPgammaLED_prime.ino:47:36: warning: pointer to a function used in arithmetic [-Wpointer-arith]
47 | analogWrite(led, gamma[brightness]);
| ^
ESPgammaLED_prime:47:36: error: invalid conversion from 'double (*)(double)' to 'int' [-fpermissive]
47 | analogWrite(led, gamma[brightness]);
| ~~~~~~~~~~~~~~~~^
| |
| double (*)(double)
In file included from C:\Users\jacob\AppData\Local\Temp\arduino_build_913533\sketch\ESPgammaLED_prime.ino.cpp:1:
C:\Users\jacob\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\cores\esp8266/Arduino.h:174:35: note: initializing argument 2 of 'void analogWrite(uint8_t, int)'
174 | void analogWrite(uint8_t pin, int val);
| ~~~~^~~
exit status 1
'byte gamma [256]' redeclared as different kind of entity