1 // Copyright 2013 Olivier Gillet.
2 //
3 // Author: Olivier Gillet (ol.gillet@gmail.com)
4 //
5 // Permission is hereby granted, free of charge, to any person obtaining a copy
6 // of this software and associated documentation files (the "Software"), to deal
7 // in the Software without restriction, including without limitation the rights
8 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 // copies of the Software, and to permit persons to whom the Software is
10 // furnished to do so, subject to the following conditions:
11 //
12 // The above copyright notice and this permission notice shall be included in
13 // all copies or substantial portions of the Software.
14 //
15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21 // THE SOFTWARE.
22 //
23 // See http://creativecommons.org/licenses/MIT/ for more information.
24 //
25 // -----------------------------------------------------------------------------
26 //
27 // System level initialization.
28
29 #include "yarns/drivers/system.h"
30
31 #include <stm32f10x_conf.h>
32
33 namespace yarns {
34
Init()35 void System::Init() {
36 SystemInit();
37
38 NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x1000);
39
40 RCC_APB2PeriphClockCmd(
41 RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC |
42 RCC_APB2Periph_TIM1 | RCC_APB2Periph_USART1, ENABLE);
43 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
44
45 TIM_TimeBaseInitTypeDef timer_init;
46 timer_init.TIM_Period = F_CPU / (48000 * 4) - 1;
47 timer_init.TIM_Prescaler = 0;
48 timer_init.TIM_ClockDivision = TIM_CKD_DIV1;
49 timer_init.TIM_CounterMode = TIM_CounterMode_Up;
50 timer_init.TIM_RepetitionCounter = 0;
51 TIM_InternalClockConfig(TIM1);
52 TIM_TimeBaseInit(TIM1, &timer_init);
53 TIM_Cmd(TIM1, ENABLE);
54
55 NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); // 2.2 priority split.
56
57 // DAC interrupt is given highest priority
58 NVIC_InitTypeDef timer_interrupt;
59 timer_interrupt.NVIC_IRQChannel = TIM1_UP_IRQn;
60 timer_interrupt.NVIC_IRQChannelPreemptionPriority = 0;
61 timer_interrupt.NVIC_IRQChannelSubPriority = 0;
62 timer_interrupt.NVIC_IRQChannelCmd = ENABLE;
63 NVIC_Init(&timer_interrupt);
64 }
65
StartTimers()66 void System::StartTimers() {
67 TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE);
68 SysTick_Config(F_CPU / 8000);
69 }
70
71 } // namespace yarns
72