fixed wrong location for call to mapResolution(), doc updates

Author: mattairtech

README.md

@@ -527,10 +527,10 @@ Vista, 7, 8, and 10. Note that the Windows 10 generic CDC drivers work as well.
 *OS X support was added in version 1.6.7-beta-b0.*
 
 0. No driver installation is needed.
-5. Plug in the board. You may get a dialog box asking if you wish to open the “Network Preferences”:
+1. Plug in the board. You may get a dialog box asking if you wish to open the “Network Preferences”:
    * Click the "Network Preferences..." button, then click "Apply".
    * The board will show up as “Not Configured”, but it will work fine.
-5. Continue with SAM M0+ Core Installation below.
+2. Continue with SAM M0+ Core Installation below.
 
 
 ### SAM M0+ Core Installation
@@ -539,14 +539,14 @@ Vista, 7, 8, and 10. Note that the Windows 10 generic CDC drivers work as well.
 
 * To update from a previous version, click on MattairTech SAM M0+ Boards in Boards Manager, then click Update.
 
-1. The MattairTech SAM M0+ Core requires Arduino 1.6.7 or above (including 1.8.x).
+1. The MattairTech SAM M0+ Core requires Arduino IDE 1.6.7 or above (including 1.8.x).
 2. In the Arduino IDE, click File->Preferences.
 3. Click the button next to Additional Boards Manager URLs.
 4. Add https://www.mattairtech.com/software/arduino/package_MattairTech_index.json.
 5. Save preferences, then open the Boards Manager.
 6. Install the Arduino SAMD Boards package. Use version 1.6.2 or higher.
 7. Install the MattairTech SAM M0+ Boards package.
-8. Close Boards Manager, then click Tools->Board->MattairTech MT-D21E (or MT-D11).
+8. Close Boards Manager, then click Tools->Board->(choose board).
 9. Select the MCU with the now visible Tools->Microcontroller menu (if present).
 10. If you do not already have the bootloader or blink sketch installed, see SAM-BA USB CDC Bootloader below.
 11. Plug in the board. The blink sketch should be running.

bootloaders/zero/README.md

@@ -254,13 +254,15 @@ This driver is the same as the one used by the MattairTech SAM M0+ Core.
 4. Continue with driver installation above.
 
 
-### Bossac Utility Installation
+### Bossac Utility
 
-This version of the bootloader requires bossac (1.7.0-mattairtech-1) from the package "MattairTech SAM M0+ Boards".
-If using the Arduino IDE to upload firmware, then download the core.
+This version of the bootloader requires bossac (1.7.0-mattairtech-1) or above.
 
 **See the MattairTech SAM M0+ Core [README.md](https://github.com/mattairtech/ArduinoCore-samd/tree/master/README.md) "Driver Installation" for installation instructions.).**
 
+#### Bossac Utility Installation
+
+If using the Arduino IDE to upload firmware, then this will be installed automatically when intalling the core.
 If using Bossac standalone, download bossac directly at:
 
 * https://www.mattairtech.com/software/arduino/bossac-1.7.0-mattairtech-1-mingw32.tar.gz (Windows 32 bit and 64 bit)

cores/arduino/wiring_analog.c

@@ -354,6 +354,8 @@ void analogWrite(uint32_t pin, uint32_t value)
       timerIndex = (uint8_t)(((uint32_t)TCCx - (uint32_t)TCC0) >> 10);
     }
 
+    value = mapResolution(value, _writeResolution, 16);
+
     if (!tcEnabled[timerIndex]) {
       tcEnabled[timerIndex] = true;
 
@@ -365,8 +367,6 @@ void analogWrite(uint32_t pin, uint32_t value)
       while ( GCLK->SYNCBUSY.reg & GCLK_SYNCBUSY_MASK );
 #endif
 
-      value = mapResolution(value, _writeResolution, 16);
-
       // Set PORT
       if ( TCx )
       {