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Initial commit of STM32 test code.
author Daniel O'Connor <darius@dons.net.au>
date Mon, 03 Oct 2011 21:19:15 +1030
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1 /**
2 @page TIM_PWM_Output TIM PWM Output example
3
4 @verbatim
5 ******************** (C) COPYRIGHT 2011 STMicroelectronics *******************
6 * @file TIM/PWM_Output/readme.txt
7 * @author MCD Application Team
8 * @version V3.5.0
9 * @date 08-April-2011
10 * @brief Description of the TIM PWM Output example.
11 ******************************************************************************
12 * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
13 * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
14 * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
15 * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
16 * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
17 * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
18 ******************************************************************************
19 @endverbatim
20
21 @par Example Description
22
23 This example shows how to configure the TIM peripheral in PWM (Pulse Width Modulation)
24 mode.
25
26 The TIM3CLK frequency is set to SystemCoreClock / 2 (Hz), to get TIM3 counter
27 clock at 24 MHz the Prescaler is computed as following:
28 - Prescaler = (TIM3CLK / TIM3 counter clock) - 1
29 SystemCoreClock is set to 72 MHz for Low-density, Medium-density, High-density
30 and Connectivity line devices and to 24 MHz for Value line devices.
31
32 The TIM3 is running at 36 KHz: TIM3 Frequency = TIM3 counter clock/(ARR + 1)
33 = 24 MHz / 666 = 36 KHz
34 The TIM3 CCR1 register value is equal to 500, so the TIM3 Channel 1 generates a
35 PWM signal with a frequency equal to 36 KHz and a duty cycle equal to 50%:
36 TIM3 Channel1 duty cycle = (TIM3_CCR1/ TIM3_ARR + 1)* 100 = 50%
37
38 The TIM3 CCR2 register value is equal to 375, so the TIM3 Channel 2 generates a
39 PWM signal with a frequency equal to 36 KHz and a duty cycle equal to 37.5%:
40 TIM3 Channel2 duty cycle = (TIM3_CCR2/ TIM3_ARR + 1)* 100 = 37.5%
41
42 The TIM3 CCR3 register value is equal to 250, so the TIM3 Channel 3 generates a
43 PWM signal with a frequency equal to 36 KHz and a duty cycle equal to 25%:
44 TIM3 Channel3 duty cycle = (TIM3_CCR3/ TIM3_ARR + 1)* 100 = 25%
45
46 The TIM3 CCR4 register value is equal to 125, so the TIM3 Channel 4 generates a
47 PWM signal with a frequency equal to 36 KHz and a duty cycle equal to 12.5%:
48 TIM3 Channel4 duty cycle = (TIM3_CCR4/ TIM3_ARR + 1)* 100 = 12.5%
49
50 The PWM waveform can be displayed using an oscilloscope.
51
52 @par Directory contents
53
54 - TIM/PWM_Output/stm32f10x_conf.h Library Configuration file
55 - TIM/PWM_Output/stm32f10x_it.c Interrupt handlers
56 - TIM/PWM_Output/stm32f10x_it.h Interrupt handlers header file
57 - TIM/PWM_Output/main.c Main program
58 - TIM/PWM_Output/system_stm32f10x.c STM32F10x system source file
59
60 @par Hardware and Software environment
61
62 - This example runs on STM32F10x Connectivity line, High-Density, High-Density
63 Value line, Medium-Density, XL-Density, Medium-Density Value line, Low-Density
64 and Low-Density Value line Devices.
65
66 - This example has been tested with STMicroelectronics STM32100E-EVAL (High-Density
67 Value line), STM32100B-EVAL (Medium-Density Value line), STM3210C-EVAL (Connectivity line),
68 STM3210E-EVAL (High-Density and XL-Density) and STM3210B-EVAL (Medium-Density)
69 evaluation boards and can be easily tailored to any other supported device
70 and development board.
71
72 - STM3210C-EVAL Set-up
73 - Connect the following pins(TIM3 full remapping pins) to an oscilloscope to monitor the different
74 waveforms:
75 - PC.06: (TIM3_CH1)
76 - PC.07: (TIM3_CH2)
77 - PC.08: (TIM3_CH3)
78 - PC.09: (TIM3_CH4)
79
80 - STM32100B-EVAL, STM3210E-EVAL, STM32100E-EVAL and STM3210B-EVAL Set-up
81 - Connect the following pins to an oscilloscope to monitor the different
82 waveforms:
83 - PA.06: (TIM3_CH1)
84 - PA.07: (TIM3_CH2)
85 - PB.00: (TIM3_CH3)
86 - PB.01: (TIM3_CH4)
87
88 @par How to use it ?
89
90 In order to make the program work, you must do the following :
91 - Copy all source files from this example folder to the template folder under
92 Project\STM32F10x_StdPeriph_Template
93 - Open your preferred toolchain
94 - Rebuild all files and load your image into target memory
95 - Run the example
96
97 @note
98 - Low-density Value line devices are STM32F100xx microcontrollers where the
99 Flash memory density ranges between 16 and 32 Kbytes.
100 - Low-density devices are STM32F101xx, STM32F102xx and STM32F103xx
101 microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes.
102 - Medium-density Value line devices are STM32F100xx microcontrollers where
103 the Flash memory density ranges between 64 and 128 Kbytes.
104 - Medium-density devices are STM32F101xx, STM32F102xx and STM32F103xx
105 microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes.
106 - High-density Value line devices are STM32F100xx microcontrollers where
107 the Flash memory density ranges between 256 and 512 Kbytes.
108 - High-density devices are STM32F101xx and STM32F103xx microcontrollers where
109 the Flash memory density ranges between 256 and 512 Kbytes.
110 - XL-density devices are STM32F101xx and STM32F103xx microcontrollers where
111 the Flash memory density ranges between 512 and 1024 Kbytes.
112 - Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers.
113
114 * <h3><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h3>
115 */