freq.h

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/*
   Copyright 2018 Paul Konstantin Gerke

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
 */

#ifndef FREQ_H
#define FREQ_H

#include <stdint.h>
#include <stdbool.h>
#include <string.h>

#ifndef _XTAL_FREQ 
#error "_XTAL_FREQ must be set to a valid value"
#endif

#ifdef __LIBPIC170X_DOXYGEN
  #define OSCCON_BITS 0
  #define __LIBPIC170X_DEVICE_NAME "PIC16LF1705"
#endif

#if _XTAL_FREQ == 32000000
  #define OSCCON_BITS 0b11110010

  #define TIMER0_MS_INC 8
  #define TIMER0_US_INC 192
  #define TIMER0_PRESCALE_BITS 0x07
#elif _XTAL_FREQ == 16000000
  #define OSCCON_BITS 0b01111010

  #define TIMER0_MS_INC 16
  #define TIMER0_US_INC 384
  #define TIMER0_PRESCALE_BITS 0x07
#elif _XTAL_FREQ == 8000000
  #define OSCCON_BITS 0b01110010

  #define TIMER0_MS_INC 32
  #define TIMER0_US_INC 768
  #define TIMER0_PRESCALE_BITS 0x07
#elif _XTAL_FREQ == 4000000
  #define OSCCON_BITS 0b01101010

  #define TIMER0_MS_INC 65
  #define TIMER0_US_INC 536
  #define TIMER0_PRESCALE_BITS 0x07
#elif _XTAL_FREQ == 2000000
  #define OSCCON_BITS 0b01100010

  #define TIMER0_MS_INC 131
  #define TIMER0_US_INC 072
  #define TIMER0_PRESCALE_BITS 0x07
#elif _XTAL_FREQ == 1000000
  #define OSCCON_BITS 0b01011010

  #define TIMER0_MS_INC 131
  #define TIMER0_US_INC 072
  #define TIMER0_PRESCALE_BITS 0x06
#elif _XTAL_FREQ == 500000
  #define OSCCON_BITS 0b00111010

  #define TIMER0_MS_INC 131
  #define TIMER0_US_INC 072
  #define TIMER0_PRESCALE_BITS 0x05
#else
  #if _XTAL_FREQ < 500000
    #error "Invalid frequency (frequencies < 500kHz not supported)"
  #else
    #error "Invalid frequency"
  #endif
#endif

#ifdef _16LF1705
  #define __LIBPIC170X_DEVICE_NAME "PIC16LF1705"
#elif _16F1705
  #define __LIBPIC170X_DEVICE_NAME "PIC16F1705"
#elif _16LF1709
  #define __LIBPIC170X_DEVICE_NAME "PIC16ÖF1709"
#elif _16F1709
  #define __LIBPIC170X_DEVICE_NAME "PIC16F1709"
#else
  #error "Unsupported chip"
#endif

extern const uint32_t __LIBPIC170X_BUILT_XTAL_FREQ;
extern const char* __LIBPIC170X_BUILT_DEVICE_NAME;

static bool libpic170x_check_library_build_arguments() {
    return 
        (strcmp(__LIBPIC170X_BUILT_DEVICE_NAME, __LIBPIC170X_DEVICE_NAME) == 0)
        && (__LIBPIC170X_BUILT_XTAL_FREQ == _XTAL_FREQ);
}

#endif  /* FREQ_H */