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avrdude: Version 6.0.1, compiled on Apr 15 2015 at 19:59:58

         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/

         Copyright (c) 2007-2009 Joerg Wunsch

         System wide configuration file is "C:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf"

         Using Port                    : COM6

         Using Programmer              : arduino

         Overriding Baud Rate          : 57600

         AVR Part                      : ATmega328P

         Chip Erase delay              : 9000 us

         PAGEL                         : PD7

         BS2                           : PC2

         RESET disposition             : dedicated

         RETRY pulse                   : SCK

         serial program mode           : yes

         parallel program mode         : yes

         Timeout                       : 200

         StabDelay                     : 100

         CmdexeDelay                   : 25

         SyncLoops                     : 32

         ByteDelay                     : 0

         PollIndex                     : 3

         PollValue                     : 0x53

         Memory Detail                 :

                                  Block Poll               Page                       Polled

           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack

           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------

           eeprom        65    20     4    0 no       1024    4      0  3600  3600 0xff 0xff

           flash         65     6   128    0 yes     32768  128    256  4500  4500 0xff 0xff

           lfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00

           hfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00

           efuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00

           lock           0     0     0    0 no          1    0      0  4500  4500 0x00 0x00

           calibration    0     0     0    0 no          1    0      0     0     0 0x00 0x00

           signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00

         Programmer Type : Arduino

         Description     : Arduino

         Hardware Version: 2

         Firmware Version: 1.16

         Vtarget         : 0.0 V

         Varef           : 0.0 V

         Oscillator      : Off

         SCK period      : 0.1 us

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.01s

avrdude: Device signature = 0x1e950f

avrdude: reading input file "C:\Users\shin\AppData\Local\Temp\build56906a4f22bf0a8b9bdb55c318239f30.tmp/sketch_mar27a.ino.hex"

avrdude: writing flash (1796 bytes):

Writing | ################################################## | 100% 1.18s

avrdude: 1796 bytes of flash written

avrdude: verifying flash memory against C:\Users\shin\AppData\Local\Temp\build56906a4f22bf0a8b9bdb55c318239f30.tmp/sketch_mar27a.ino.hex:

avrdude: load data flash data from input file C:\Users\shin\AppData\Local\Temp\build56906a4f22bf0a8b9bdb55c318239f30.tmp/sketch_mar27a.ino.hex:

avrdude: input file C:\Users\shin\AppData\Local\Temp\build56906a4f22bf0a8b9bdb55c318239f30.tmp/sketch_mar27a.ino.hex contains 1796 bytes

avrdude: reading on-chip flash data:

Reading | ################################################## | 100% 1.05s

avrdude: verifying ...

avrdude: 1796 bytes of flash verified

avrdude done.  Thank you. 

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  while(1)
  {
    Serial.print("Hello world.");
  }
}

void pwmSetRange (unsigned int range)

{

  if ((wiringPiMode == WPI_MODE_PINS) || (wiringPiMode == WPI_MODE_PHYS) || (wiringPiMode == WPI_MODE_GPIO))

  {

    *(pwm + PWM0_RANGE) = range ; delayMicroseconds (10) ;

    *(pwm + PWM1_RANGE) = range ; delayMicroseconds (10) ;

  }

}

void pwmSetClock (int divisor)

{

  uint32_t pwm_control ;

  divisor &= 4095 ;

  if ((wiringPiMode == WPI_MODE_PINS) || (wiringPiMode == WPI_MODE_PHYS) || (wiringPiMode == WPI_MODE_GPIO))

  {

    if (wiringPiDebug)

      printf ("Setting to: %d. Current: 0x%08X\n", divisor, *(clk + PWMCLK_DIV)) ;

    pwm_control = *(pwm + PWM_CONTROL) ;                // preserve PWM_CONTROL

// We need to stop PWM prior to stopping PWM clock in MS mode otherwise BUSY

// stays high.

    *(pwm + PWM_CONTROL) = 0 ;                          // Stop PWM

// Stop PWM clock before changing divisor. The delay after this does need to

// this big (95uS occasionally fails, 100uS OK), it's almost as though the BUSY

// flag is not working properly in balanced mode. Without the delay when DIV is

// adjusted the clock sometimes switches to very slow, once slow further DIV

// adjustments do nothing and it's difficult to get out of this mode.

    *(clk + PWMCLK_CNTL) = BCM_PASSWORD | 0x01 ;        // Stop PWM Clock

      delayMicroseconds (110) ;                 // prevents clock going sloooow

    while ((*(clk + PWMCLK_CNTL) & 0x80) != 0)  // Wait for clock to be !BUSY

      delayMicroseconds (1) ;

    *(clk + PWMCLK_DIV)  = BCM_PASSWORD | (divisor << 12) ;

    *(clk + PWMCLK_CNTL) = BCM_PASSWORD | 0x11 ;        // Start PWM clock

    *(pwm + PWM_CONTROL) = pwm_control ;                // restore PWM_CONTROL

    if (wiringPiDebug)

      printf ("Set     to: %d. Now    : 0x%08X\n", divisor, *(clk + PWMCLK_DIV)) ;

  }

} 

$ gpio mode 1 pwm

$ gpio pwm-ms

$ gpio pwm 1 7

$ gpio pwm-bal 

$ gpio pwm 1 7