Fixes implementation of __FlashStringHelper

[arcao]

Previous __FlashStringHelper implementation was defines as a char which brought problem in case the method with char* parameter used overloading with __FlashStringHelper* parameter (they was identical). Now __FlashStringHelper is defined as a class and all casts between char* and __FlashStringHelper* are made with reinterpret_cast sugar.

[arcao]

Please wait with merging... Thanks.

[arcao]

Test done.

Source:

void setup() {
  Serial.begin(115200);
  Serial.setDebugOutput(true);

  Serial.println("----------------------------");
  
  Serial.print(F("print\n"));

  Serial.println("----------------------------");

  Serial.println(F("println"));

  Serial.println("----------------------------");

  String var1 = F("F -> String\n");
  Serial.print(var1);

  Serial.println("----------------------------");

  var1 += F("String + F\n");
  Serial.print(var1);

  Serial.println("----------------------------");

  String var2 = String(F("String(F)\n"));
  Serial.print(var2);
}

void loop() {}

Result:

ets Jun  8 2016 00:22:57

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
ets Jun  8 2016 00:22:57

rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0x00
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0008,len:8
load:0x3fff0010,len:1760
load:0x40078000,len:6668
load:0x40080000,len:252
entry 0x40080034
----------------------------
print
----------------------------
println
----------------------------
F -> String
----------------------------
F -> String
String + F
----------------------------
String(F)

[me-no-dev]

awesome :)