Clemens Valens / Mbed 2 deprecated touchpad

mbed with Nintendo DS touchpad, accelerometer & touchpad.

Dependencies:   mbed

my_pwm_out.cpp@0:0a76ae27065b, 2010-05-05 (annotated)

Committer:
Clemo
Date:
Wed May 05 12:10:15 2010 +0000
Revision:
0:0a76ae27065b

        

        
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/*





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mbed touchpad & accelerometer experiments.





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CPV, 14/09/2009





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*/





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#include "my_pwm_out.h"





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using namespace mbed;





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MyPwmOut::MyPwmOut(PinName pin, const char *name) : PwmOut(pin,name)





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{





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  m_channel = (pin&0x0000001f) + 1; // Between 1 and 6.





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  m_p_mrx = (uint32_t *)&LPC_PWM1->MR0 + m_channel; // Select MRx register for this channel.





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  if (m_channel>=4) m_p_mrx += 6; // Skip CR registers if needed.





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  m_pclk = get_pclk();





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}





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float MyPwmOut::get_pclk(void)





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{





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  float Fin = 12000000; // From the mbed schematic.





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  uint32_t m = 1 + (LPC_SC->PLL0STAT&0x00007fff);





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  uint32_t n = 1 + ((LPC_SC->PLL0STAT&0x00ff0000)>>16);





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  float Fcco = 2*m*Fin/n; // PLL frequency.





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  float cclk = Fcco/(1+(LPC_SC->CCLKCFG&0x000000ff)); // Get CCLK from Fcco.





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  m_pclk = cclk/4;





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  switch ((LPC_SC->PCLKSEL0&0x00003000)>>12)





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  {





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    case 0: m_pclk = cclk/4; break;





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    case 1: m_pclk = cclk; break;





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    case 2: m_pclk = cclk/2; break;





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    case 3: m_pclk = cclk/8; break;





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  }





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  //printf("Fin = %0.0f\n",Fin);





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  //printf("m = %d, n = %d\n",m,n);





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  //printf("Fcco = %0.0f\n",Fcco);





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  //printf("CLKC = %0.0f\n",cclk);





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  //printf("PLCK = %0.0f\n",m_pclk);





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  return m_pclk;





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}





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void MyPwmOut::set(float period, float duty_cycle)





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{





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  LPC_PWM1->MR0 = period*m_pclk; // Set new period in seconds.





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  *m_p_mrx = duty_cycle * LPC_PWM1->MR0; // Set new duty-cycle.





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  LPC_PWM1->LER |= (1<<m_channel)|1; // Use MRx & MR0 value on next TC reset.





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}





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