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comparison libs/STM32F10x_StdPeriph_Lib_V3.5.0/Project/STM32F10x_StdPeriph_Examples/TIM/PWM_Output/main.c @ 0:c59513fd84fb
Initial commit of STM32 test code.
author | Daniel O'Connor <darius@dons.net.au> |
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date | Mon, 03 Oct 2011 21:19:15 +1030 |
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1 /** | |
2 ****************************************************************************** | |
3 * @file TIM/PWM_Output/main.c | |
4 * @author MCD Application Team | |
5 * @version V3.5.0 | |
6 * @date 08-April-2011 | |
7 * @brief Main program body | |
8 ****************************************************************************** | |
9 * @attention | |
10 * | |
11 * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS | |
12 * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE | |
13 * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY | |
14 * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING | |
15 * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE | |
16 * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. | |
17 * | |
18 * <h2><center>© COPYRIGHT 2011 STMicroelectronics</center></h2> | |
19 ****************************************************************************** | |
20 */ | |
21 | |
22 /* Includes ------------------------------------------------------------------*/ | |
23 #include "stm32f10x.h" | |
24 | |
25 /** @addtogroup STM32F10x_StdPeriph_Examples | |
26 * @{ | |
27 */ | |
28 | |
29 /** @addtogroup TIM_PWM_Output | |
30 * @{ | |
31 */ | |
32 | |
33 /* Private typedef -----------------------------------------------------------*/ | |
34 /* Private define ------------------------------------------------------------*/ | |
35 /* Private macro -------------------------------------------------------------*/ | |
36 /* Private variables ---------------------------------------------------------*/ | |
37 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; | |
38 TIM_OCInitTypeDef TIM_OCInitStructure; | |
39 uint16_t CCR1_Val = 333; | |
40 uint16_t CCR2_Val = 249; | |
41 uint16_t CCR3_Val = 166; | |
42 uint16_t CCR4_Val = 83; | |
43 uint16_t PrescalerValue = 0; | |
44 | |
45 /* Private function prototypes -----------------------------------------------*/ | |
46 void RCC_Configuration(void); | |
47 void GPIO_Configuration(void); | |
48 | |
49 /* Private functions ---------------------------------------------------------*/ | |
50 | |
51 /** | |
52 * @brief Main program | |
53 * @param None | |
54 * @retval None | |
55 */ | |
56 int main(void) | |
57 { | |
58 /*!< At this stage the microcontroller clock setting is already configured, | |
59 this is done through SystemInit() function which is called from startup | |
60 file (startup_stm32f10x_xx.s) before to branch to application main. | |
61 To reconfigure the default setting of SystemInit() function, refer to | |
62 system_stm32f10x.c file | |
63 */ | |
64 | |
65 /* System Clocks Configuration */ | |
66 RCC_Configuration(); | |
67 | |
68 /* GPIO Configuration */ | |
69 GPIO_Configuration(); | |
70 | |
71 /* ----------------------------------------------------------------------- | |
72 TIM3 Configuration: generate 4 PWM signals with 4 different duty cycles: | |
73 The TIM3CLK frequency is set to SystemCoreClock (Hz), to get TIM3 counter | |
74 clock at 24 MHz the Prescaler is computed as following: | |
75 - Prescaler = (TIM3CLK / TIM3 counter clock) - 1 | |
76 SystemCoreClock is set to 72 MHz for Low-density, Medium-density, High-density | |
77 and Connectivity line devices and to 24 MHz for Low-Density Value line and | |
78 Medium-Density Value line devices | |
79 | |
80 The TIM3 is running at 36 KHz: TIM3 Frequency = TIM3 counter clock/(ARR + 1) | |
81 = 24 MHz / 666 = 36 KHz | |
82 TIM3 Channel1 duty cycle = (TIM3_CCR1/ TIM3_ARR)* 100 = 50% | |
83 TIM3 Channel2 duty cycle = (TIM3_CCR2/ TIM3_ARR)* 100 = 37.5% | |
84 TIM3 Channel3 duty cycle = (TIM3_CCR3/ TIM3_ARR)* 100 = 25% | |
85 TIM3 Channel4 duty cycle = (TIM3_CCR4/ TIM3_ARR)* 100 = 12.5% | |
86 ----------------------------------------------------------------------- */ | |
87 /* Compute the prescaler value */ | |
88 PrescalerValue = (uint16_t) (SystemCoreClock / 24000000) - 1; | |
89 /* Time base configuration */ | |
90 TIM_TimeBaseStructure.TIM_Period = 665; | |
91 TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue; | |
92 TIM_TimeBaseStructure.TIM_ClockDivision = 0; | |
93 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; | |
94 | |
95 TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); | |
96 | |
97 /* PWM1 Mode configuration: Channel1 */ | |
98 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; | |
99 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; | |
100 TIM_OCInitStructure.TIM_Pulse = CCR1_Val; | |
101 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; | |
102 | |
103 TIM_OC1Init(TIM3, &TIM_OCInitStructure); | |
104 | |
105 TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable); | |
106 | |
107 /* PWM1 Mode configuration: Channel2 */ | |
108 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; | |
109 TIM_OCInitStructure.TIM_Pulse = CCR2_Val; | |
110 | |
111 TIM_OC2Init(TIM3, &TIM_OCInitStructure); | |
112 | |
113 TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable); | |
114 | |
115 /* PWM1 Mode configuration: Channel3 */ | |
116 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; | |
117 TIM_OCInitStructure.TIM_Pulse = CCR3_Val; | |
118 | |
119 TIM_OC3Init(TIM3, &TIM_OCInitStructure); | |
120 | |
121 TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable); | |
122 | |
123 /* PWM1 Mode configuration: Channel4 */ | |
124 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; | |
125 TIM_OCInitStructure.TIM_Pulse = CCR4_Val; | |
126 | |
127 TIM_OC4Init(TIM3, &TIM_OCInitStructure); | |
128 | |
129 TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable); | |
130 | |
131 TIM_ARRPreloadConfig(TIM3, ENABLE); | |
132 | |
133 /* TIM3 enable counter */ | |
134 TIM_Cmd(TIM3, ENABLE); | |
135 | |
136 while (1) | |
137 {} | |
138 } | |
139 | |
140 /** | |
141 * @brief Configures the different system clocks. | |
142 * @param None | |
143 * @retval None | |
144 */ | |
145 void RCC_Configuration(void) | |
146 { | |
147 /* TIM3 clock enable */ | |
148 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); | |
149 | |
150 /* GPIOA and GPIOB clock enable */ | |
151 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | | |
152 RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE); | |
153 } | |
154 | |
155 /** | |
156 * @brief Configure the TIM3 Ouput Channels. | |
157 * @param None | |
158 * @retval None | |
159 */ | |
160 void GPIO_Configuration(void) | |
161 { | |
162 GPIO_InitTypeDef GPIO_InitStructure; | |
163 | |
164 #ifdef STM32F10X_CL | |
165 /*GPIOB Configuration: TIM3 channel1, 2, 3 and 4 */ | |
166 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9; | |
167 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; | |
168 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; | |
169 | |
170 GPIO_Init(GPIOC, &GPIO_InitStructure); | |
171 | |
172 GPIO_PinRemapConfig(GPIO_FullRemap_TIM3, ENABLE); | |
173 | |
174 #else | |
175 /* GPIOA Configuration:TIM3 Channel1, 2, 3 and 4 as alternate function push-pull */ | |
176 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7; | |
177 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; | |
178 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; | |
179 | |
180 GPIO_Init(GPIOA, &GPIO_InitStructure); | |
181 | |
182 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1; | |
183 GPIO_Init(GPIOB, &GPIO_InitStructure); | |
184 #endif | |
185 } | |
186 | |
187 #ifdef USE_FULL_ASSERT | |
188 | |
189 /** | |
190 * @brief Reports the name of the source file and the source line number | |
191 * where the assert_param error has occurred. | |
192 * @param file: pointer to the source file name | |
193 * @param line: assert_param error line source number | |
194 * @retval None | |
195 */ | |
196 void assert_failed(uint8_t* file, uint32_t line) | |
197 { | |
198 /* User can add his own implementation to report the file name and line number, | |
199 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ | |
200 | |
201 while (1) | |
202 {} | |
203 } | |
204 | |
205 #endif | |
206 | |
207 /** | |
208 * @} | |
209 */ | |
210 | |
211 /** | |
212 * @} | |
213 */ | |
214 | |
215 /******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/ |