spinal cord / PokittoLib_

PokittoLib is the library needed for programming the Pokitto DIY game console (www.pokitto.com)

POKITTO_HW/PokittoClock.cpp@31:f4b9b85c7b62, 2018-01-30 (annotated)

Committer:
Pokitto
Date:
Tue Jan 30 10:41:47 2018 +0000
Revision:
31:f4b9b85c7b62
Sound output improvements added:  louder, clearer, faster!

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Pokitto 31:f4b9b85c7b62 1 /**************************************************************************/
Pokitto 31:f4b9b85c7b62 2 /*!
Pokitto 31:f4b9b85c7b62 3 @file PokittoClock.cpp
Pokitto 31:f4b9b85c7b62 4 @author Jonne Valola
Pokitto 31:f4b9b85c7b62 5
Pokitto 31:f4b9b85c7b62 6 @section LICENSE
Pokitto 31:f4b9b85c7b62 7
Pokitto 31:f4b9b85c7b62 8 Software License Agreement (BSD License)
Pokitto 31:f4b9b85c7b62 9
Pokitto 31:f4b9b85c7b62 10 Copyright (c) 2015, Jonne Valola
Pokitto 31:f4b9b85c7b62 11 All rights reserved.
Pokitto 31:f4b9b85c7b62 12
Pokitto 31:f4b9b85c7b62 13 Redistribution and use in source and binary forms, with or without
Pokitto 31:f4b9b85c7b62 14 modification, are permitted provided that the following conditions are met:
Pokitto 31:f4b9b85c7b62 15 1. Redistributions of source code must retain the above copyright
Pokitto 31:f4b9b85c7b62 16 notice, this list of conditions and the following disclaimer.
Pokitto 31:f4b9b85c7b62 17 2. Redistributions in binary form must reproduce the above copyright
Pokitto 31:f4b9b85c7b62 18 notice, this list of conditions and the following disclaimer in the
Pokitto 31:f4b9b85c7b62 19 documentation and/or other materials provided with the distribution.
Pokitto 31:f4b9b85c7b62 20 3. Neither the name of the copyright holders nor the
Pokitto 31:f4b9b85c7b62 21 names of its contributors may be used to endorse or promote products
Pokitto 31:f4b9b85c7b62 22 derived from this software without specific prior written permission.
Pokitto 31:f4b9b85c7b62 23
Pokitto 31:f4b9b85c7b62 24 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
Pokitto 31:f4b9b85c7b62 25 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
Pokitto 31:f4b9b85c7b62 26 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
Pokitto 31:f4b9b85c7b62 27 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
Pokitto 31:f4b9b85c7b62 28 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
Pokitto 31:f4b9b85c7b62 29 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
Pokitto 31:f4b9b85c7b62 30 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
Pokitto 31:f4b9b85c7b62 31 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
Pokitto 31:f4b9b85c7b62 32 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
Pokitto 31:f4b9b85c7b62 33 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Pokitto 31:f4b9b85c7b62 34 */
Pokitto 31:f4b9b85c7b62 35 /**************************************************************************/
Pokitto 31:f4b9b85c7b62 36
Pokitto 31:f4b9b85c7b62 37 #include "PokittoCore.h"
Pokitto 31:f4b9b85c7b62 38 #include "pinmap.h"
Pokitto 31:f4b9b85c7b62 39 #include "HWLCD.h"
Pokitto 31:f4b9b85c7b62 40 #include "Pokitto_settings.h"
Pokitto 31:f4b9b85c7b62 41 #include "wait_api.h"
Pokitto 31:f4b9b85c7b62 42
Pokitto 31:f4b9b85c7b62 43 uint32_t pt_count=0;
Pokitto 31:f4b9b85c7b62 44 uint32_t* ptimer;
Pokitto 31:f4b9b85c7b62 45
Pokitto 31:f4b9b85c7b62 46 extern "C" {
Pokitto 31:f4b9b85c7b62 47 void SysTick_Handler(void) {
Pokitto 31:f4b9b85c7b62 48 //interrupt happens when systick has counted down to zero
Pokitto 31:f4b9b85c7b62 49 #if PROJ_GAMEBOY > 0
Pokitto 31:f4b9b85c7b62 50 uint32_t a;
Pokitto 31:f4b9b85c7b62 51 a = *ptimer;
Pokitto 31:f4b9b85c7b62 52 *ptimer = a + 1;
Pokitto 31:f4b9b85c7b62 53 #endif
Pokitto 31:f4b9b85c7b62 54 pt_count+=10; // increment counter
Pokitto 31:f4b9b85c7b62 55 }}
Pokitto 31:f4b9b85c7b62 56
Pokitto 31:f4b9b85c7b62 57 using namespace Pokitto;
Pokitto 31:f4b9b85c7b62 58
Pokitto 31:f4b9b85c7b62 59 uint32_t Core::refreshtime;
Pokitto 31:f4b9b85c7b62 60
Pokitto 31:f4b9b85c7b62 61 void Core::initClock() {
Pokitto 31:f4b9b85c7b62 62 // to get 1000 interrupts per second the reload value should be 48000
Pokitto 31:f4b9b85c7b62 63 #if PROJ_GAMEBOY > 0
Pokitto 31:f4b9b85c7b62 64 ptimer = &pt_count;
Pokitto 31:f4b9b85c7b62 65 SysTick->LOAD = 480000-1;
Pokitto 31:f4b9b85c7b62 66 #else
Pokitto 31:f4b9b85c7b62 67 SysTick->LOAD = 480000-1;
Pokitto 31:f4b9b85c7b62 68 #endif
Pokitto 31:f4b9b85c7b62 69 SysTick->VAL = 0;
Pokitto 31:f4b9b85c7b62 70 SysTick->CTRL = 4 | 2 | 1; //CLKSOURCE=CPU clock | TICKINT | ENABLE
Pokitto 31:f4b9b85c7b62 71 pt_count = 0;
Pokitto 31:f4b9b85c7b62 72 }
Pokitto 31:f4b9b85c7b62 73
Pokitto 31:f4b9b85c7b62 74 uint32_t Core::getTime() {
Pokitto 31:f4b9b85c7b62 75 return pt_count;
Pokitto 31:f4b9b85c7b62 76 }
Pokitto 31:f4b9b85c7b62 77
Pokitto 31:f4b9b85c7b62 78 void Core::wait(uint16_t ms) {
Pokitto 31:f4b9b85c7b62 79 wait_ms(ms);
Pokitto 31:f4b9b85c7b62 80 }
Pokitto 31:f4b9b85c7b62 81
Pokitto 31:f4b9b85c7b62 82