TIM4_SlaveSelect.hpp

00001 //--------------------------------------------------------------
00002 //  Class for generate SPI slave select using TIM4
00003 //
00004 //  PB_6 (D10), PB_7, PB_8 (D15), and PB_9 (D14) can be used
00005 //  2015/03/31, Copyright (c) 2015 MIKAMI, Naoki
00006 //--------------------------------------------------------------
00007 
00008 #ifndef TIM4_SLAVESELECT_HPP
00009 #define TIM4_SLAVESELECT_HPP
00010 
00011 #include "mbed.h"
00012 
00013 namespace Mikami
00014 {
00015     class TIM4_SlaveSelect
00016     {
00017     public:
00018         TIM4_SlaveSelect(
00019             uint16_t psc,   // prescaler
00020             uint16_t arr,   // auto-reload register
00021             PinName pin)    // pin name
00022             : myTim_(TIM4)
00023         {
00024             if ( (pin != PB_6) && (pin != PB_7)
00025                &&(pin != PB_8) && (pin != PB_9) )
00026             {
00027                 fprintf(stderr, "\r\nIllegal pin name in TIM4_SlaveSelect\r\n");
00028                 while (true) {}
00029             }
00030 
00031             PwmOut css(pin);            // for slave select
00032             myTim_->CR1 |= TIM_CR1_OPM; // one-pulse mode
00033             myTim_->PSC = psc;          // prescaler
00034             myTim_->ARR = arr;          // pulse width
00035             if (pin == PB_6) myTim_->CCR1 = 1;
00036             if (pin == PB_7) myTim_->CCR2 = 1;
00037             if (pin == PB_8) myTim_->CCR3 = 1;
00038             if (pin == PB_9) myTim_->CCR4 = 1;
00039         }
00040 
00041         // Generate slave select
00042         void SlaveSelect()
00043         {
00044             myTim_->CNT = 1;            // Set counter 1
00045             myTim_->CR1 |= TIM_CR1_CEN; // Enable TIM4
00046         }
00047 
00048     private:
00049         TIM_TypeDef* const myTim_;
00050 
00051         // Forbid to use copy constructor
00052         TIM4_SlaveSelect(const TIM4_SlaveSelect&);
00053         // Forbid to use substitution operator
00054         TIM4_SlaveSelect operator=(const TIM4_SlaveSelect&);
00055     };
00056 }
00057 #endif  // TIM4_SLAVESELECT_HPP