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annotate libs/STM32F10x_StdPeriph_Lib_V3.5.0/Project/STM32F10x_StdPeriph_Examples/TIM/7PWM_Output/main.c @ 8:58d76cf522ff

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Split out code into separate files.
author Daniel O'Connor <darius@dons.net.au>
date Sat, 04 Feb 2012 13:29:31 +1030
parents c59513fd84fb
children
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1 /**
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2 ******************************************************************************
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3 * @file TIM/7PWM_Output/main.c
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4 * @author MCD Application Team
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5 * @version V3.5.0
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6 * @date 08-April-2011
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7 * @brief Main program body
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8 ******************************************************************************
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9 * @attention
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10 *
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11 * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
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12 * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
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13 * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
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14 * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
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15 * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
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16 * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
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17 *
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18 * <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>
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19 ******************************************************************************
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20 */
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21
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22 /* Includes ------------------------------------------------------------------*/
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23 #include "stm32f10x.h"
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24
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25 /** @addtogroup STM32F10x_StdPeriph_Examples
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26 * @{
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27 */
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28
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29 /** @addtogroup TIM_7PWM_Output
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30 * @{
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31 */
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32
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33 /* Private typedef -----------------------------------------------------------*/
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34 /* Private define ------------------------------------------------------------*/
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35 /* Private macro -------------------------------------------------------------*/
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36 /* Private variables ---------------------------------------------------------*/
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37 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
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38 TIM_OCInitTypeDef TIM_OCInitStructure;
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39 uint16_t TimerPeriod = 0;
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40 uint16_t Channel1Pulse = 0, Channel2Pulse = 0, Channel3Pulse = 0, Channel4Pulse = 0;
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41
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42 /* Private function prototypes -----------------------------------------------*/
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43 void RCC_Configuration(void);
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44 void GPIO_Configuration(void);
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45
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46 /* Private functions ---------------------------------------------------------*/
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47
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48 /**
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49 * @brief Main program
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50 * @param None
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51 * @retval None
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52 */
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53 int main(void)
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54 {
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55 /*!< At this stage the microcontroller clock setting is already configured,
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56 this is done through SystemInit() function which is called from startup
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57 file (startup_stm32f10x_xx.s) before to branch to application main.
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58 To reconfigure the default setting of SystemInit() function, refer to
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59 system_stm32f10x.c file
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60 */
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61
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62 /* System Clocks Configuration */
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63 RCC_Configuration();
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64
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65 /* GPIO Configuration */
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66 GPIO_Configuration();
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67
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68 /* TIM1 Configuration ---------------------------------------------------
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69 Generate 7 PWM signals with 4 different duty cycles:
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70 TIM1CLK = SystemCoreClock, Prescaler = 0, TIM1 counter clock = SystemCoreClock
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71 SystemCoreClock is set to 72 MHz for Low-density, Medium-density, High-density
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72 and Connectivity line devices and to 24 MHz for Low-Density Value line and
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73 Medium-Density Value line devices
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74
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75 The objective is to generate 7 PWM signal at 17.57 KHz:
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76 - TIM1_Period = (SystemCoreClock / 17570) - 1
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77 The channel 1 and channel 1N duty cycle is set to 50%
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78 The channel 2 and channel 2N duty cycle is set to 37.5%
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79 The channel 3 and channel 3N duty cycle is set to 25%
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80 The channel 4 duty cycle is set to 12.5%
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81 The Timer pulse is calculated as follows:
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82 - ChannelxPulse = DutyCycle * (TIM1_Period - 1) / 100
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83 ----------------------------------------------------------------------- */
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84 /* Compute the value to be set in ARR regiter to generate signal frequency at 17.57 Khz */
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85 TimerPeriod = (SystemCoreClock / 17570 ) - 1;
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86 /* Compute CCR1 value to generate a duty cycle at 50% for channel 1 and 1N */
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87 Channel1Pulse = (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10);
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88 /* Compute CCR2 value to generate a duty cycle at 37.5% for channel 2 and 2N */
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89 Channel2Pulse = (uint16_t) (((uint32_t) 375 * (TimerPeriod - 1)) / 1000);
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90 /* Compute CCR3 value to generate a duty cycle at 25% for channel 3 and 3N */
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91 Channel3Pulse = (uint16_t) (((uint32_t) 25 * (TimerPeriod - 1)) / 100);
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92 /* Compute CCR4 value to generate a duty cycle at 12.5% for channel 4 */
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93 Channel4Pulse = (uint16_t) (((uint32_t) 125 * (TimerPeriod- 1)) / 1000);
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94
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95 /* Time Base configuration */
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96 TIM_TimeBaseStructure.TIM_Prescaler = 0;
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97 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
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98 TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
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99 TIM_TimeBaseStructure.TIM_ClockDivision = 0;
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100 TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
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101
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102 TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
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103
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104 /* Channel 1, 2,3 and 4 Configuration in PWM mode */
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105 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
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106 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
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107 TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
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108 TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;
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109 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
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110 TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
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111 TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
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112 TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
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113
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114 TIM_OC1Init(TIM1, &TIM_OCInitStructure);
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115
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116 TIM_OCInitStructure.TIM_Pulse = Channel2Pulse;
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117 TIM_OC2Init(TIM1, &TIM_OCInitStructure);
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118
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119 TIM_OCInitStructure.TIM_Pulse = Channel3Pulse;
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120 TIM_OC3Init(TIM1, &TIM_OCInitStructure);
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121
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122 TIM_OCInitStructure.TIM_Pulse = Channel4Pulse;
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123 TIM_OC4Init(TIM1, &TIM_OCInitStructure);
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124
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125 /* TIM1 counter enable */
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126 TIM_Cmd(TIM1, ENABLE);
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127
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128 /* TIM1 Main Output Enable */
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129 TIM_CtrlPWMOutputs(TIM1, ENABLE);
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130
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131 while (1)
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132 {}
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133 }
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134
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135 /**
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136 * @brief Configures the different system clocks.
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137 * @param None
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138 * @retval None
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139 */
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140 void RCC_Configuration(void)
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141 {
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142 /* TIM1, GPIOA, GPIOB, GPIOE and AFIO clocks enable */
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143 RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOE|
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144 RCC_APB2Periph_GPIOB |RCC_APB2Periph_AFIO, ENABLE);
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145 }
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146
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147 /**
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148 * @brief Configure the TIM1 Pins.
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149 * @param None
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150 * @retval None
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151 */
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152 void GPIO_Configuration(void)
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153 {
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154 GPIO_InitTypeDef GPIO_InitStructure;
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155
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156 #ifdef STM32F10X_CL
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157 /* GPIOE Configuration: Channel 1/1N, 2/2N, 3/3N and 4 as alternate function push-pull */
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158 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9|GPIO_Pin_11|GPIO_Pin_13|GPIO_Pin_14|
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159 GPIO_Pin_8|GPIO_Pin_10|GPIO_Pin_12;
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160 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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161 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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162
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163 GPIO_Init(GPIOE, &GPIO_InitStructure);
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164
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165 /* TIM1 Full remapping pins */
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166 GPIO_PinRemapConfig(GPIO_FullRemap_TIM1, ENABLE);
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167
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168 #else
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169 /* GPIOA Configuration: Channel 1, 2 and 3 as alternate function push-pull */
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170 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11;
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171 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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172 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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173 GPIO_Init(GPIOA, &GPIO_InitStructure);
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174
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175 /* GPIOB Configuration: Channel 1N, 2N and 3N as alternate function push-pull */
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176 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
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177 GPIO_Init(GPIOB, &GPIO_InitStructure);
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178
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179 #endif
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180 }
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181
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182 #ifdef USE_FULL_ASSERT
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183
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184 /**
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185 * @brief Reports the name of the source file and the source line number
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186 * where the assert_param error has occurred.
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187 * @param file: pointer to the source file name
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188 * @param line: assert_param error line source number
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189 * @retval None
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190 */
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191 void assert_failed(uint8_t* file, uint32_t line)
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192 {
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193 /* User can add his own implementation to report the file name and line number,
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194 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
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195
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196 while (1)
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197 {}
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198 }
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199
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200 #endif
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201
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202 /**
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203 * @}
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204 */
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205
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206 /**
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207 * @}
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208 */
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209
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210 /******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/