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diff --git a/tmp/STM32F10x_StdPeriph_Lib_V3.5.0/Project/STM32F10x_StdPeriph_Examples/TIM/PWM_Output/readme.txt b/tmp/STM32F10x_StdPeriph_Lib_V3.5.0/Project/STM32F10x_StdPeriph_Examples/TIM/PWM_Output/readme.txt new file mode 100644 index 0000000..469aa30 --- /dev/null +++ b/tmp/STM32F10x_StdPeriph_Lib_V3.5.0/Project/STM32F10x_StdPeriph_Examples/TIM/PWM_Output/readme.txt @@ -0,0 +1,115 @@ +/** + @page TIM_PWM_Output TIM PWM Output example + + @verbatim + ******************** (C) COPYRIGHT 2011 STMicroelectronics ******************* + * @file TIM/PWM_Output/readme.txt + * @author MCD Application Team + * @version V3.5.0 + * @date 08-April-2011 + * @brief Description of the TIM PWM Output example. + ****************************************************************************** + * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS + * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE + * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY + * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING + * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE + * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. + ****************************************************************************** + @endverbatim + +@par Example Description + +This example shows how to configure the TIM peripheral in PWM (Pulse Width Modulation) +mode. + +The TIM3CLK frequency is set to SystemCoreClock / 2 (Hz), to get TIM3 counter +clock at 24 MHz the Prescaler is computed as following: + - Prescaler = (TIM3CLK / TIM3 counter clock) - 1 +SystemCoreClock is set to 72 MHz for Low-density, Medium-density, High-density +and Connectivity line devices and to 24 MHz for Value line devices. + +The TIM3 is running at 36 KHz: TIM3 Frequency = TIM3 counter clock/(ARR + 1) + = 24 MHz / 666 = 36 KHz +The TIM3 CCR1 register value is equal to 500, so the TIM3 Channel 1 generates a +PWM signal with a frequency equal to 36 KHz and a duty cycle equal to 50%: +TIM3 Channel1 duty cycle = (TIM3_CCR1/ TIM3_ARR + 1)* 100 = 50% + +The TIM3 CCR2 register value is equal to 375, so the TIM3 Channel 2 generates a +PWM signal with a frequency equal to 36 KHz and a duty cycle equal to 37.5%: +TIM3 Channel2 duty cycle = (TIM3_CCR2/ TIM3_ARR + 1)* 100 = 37.5% + +The TIM3 CCR3 register value is equal to 250, so the TIM3 Channel 3 generates a +PWM signal with a frequency equal to 36 KHz and a duty cycle equal to 25%: +TIM3 Channel3 duty cycle = (TIM3_CCR3/ TIM3_ARR + 1)* 100 = 25% + +The TIM3 CCR4 register value is equal to 125, so the TIM3 Channel 4 generates a +PWM signal with a frequency equal to 36 KHz and a duty cycle equal to 12.5%: +TIM3 Channel4 duty cycle = (TIM3_CCR4/ TIM3_ARR + 1)* 100 = 12.5% + +The PWM waveform can be displayed using an oscilloscope. + +@par Directory contents + + - TIM/PWM_Output/stm32f10x_conf.h Library Configuration file + - TIM/PWM_Output/stm32f10x_it.c Interrupt handlers + - TIM/PWM_Output/stm32f10x_it.h Interrupt handlers header file + - TIM/PWM_Output/main.c Main program + - TIM/PWM_Output/system_stm32f10x.c STM32F10x system source file + +@par Hardware and Software environment + + - This example runs on STM32F10x Connectivity line, High-Density, High-Density + Value line, Medium-Density, XL-Density, Medium-Density Value line, Low-Density + and Low-Density Value line Devices. + + - This example has been tested with STMicroelectronics STM32100E-EVAL (High-Density + Value line), STM32100B-EVAL (Medium-Density Value line), STM3210C-EVAL (Connectivity line), + STM3210E-EVAL (High-Density and XL-Density) and STM3210B-EVAL (Medium-Density) + evaluation boards and can be easily tailored to any other supported device + and development board. + + - STM3210C-EVAL Set-up + - Connect the following pins(TIM3 full remapping pins) to an oscilloscope to monitor the different + waveforms: + - PC.06: (TIM3_CH1) + - PC.07: (TIM3_CH2) + - PC.08: (TIM3_CH3) + - PC.09: (TIM3_CH4) + + - STM32100B-EVAL, STM3210E-EVAL, STM32100E-EVAL and STM3210B-EVAL Set-up + - Connect the following pins to an oscilloscope to monitor the different + waveforms: + - PA.06: (TIM3_CH1) + - PA.07: (TIM3_CH2) + - PB.00: (TIM3_CH3) + - PB.01: (TIM3_CH4) + +@par How to use it ? + +In order to make the program work, you must do the following : + - Copy all source files from this example folder to the template folder under + Project\STM32F10x_StdPeriph_Template + - Open your preferred toolchain + - Rebuild all files and load your image into target memory + - Run the example + +@note + - Low-density Value line devices are STM32F100xx microcontrollers where the + Flash memory density ranges between 16 and 32 Kbytes. + - Low-density devices are STM32F101xx, STM32F102xx and STM32F103xx + microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes. + - Medium-density Value line devices are STM32F100xx microcontrollers where + the Flash memory density ranges between 64 and 128 Kbytes. + - Medium-density devices are STM32F101xx, STM32F102xx and STM32F103xx + microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes. + - High-density Value line devices are STM32F100xx microcontrollers where + the Flash memory density ranges between 256 and 512 Kbytes. + - High-density devices are STM32F101xx and STM32F103xx microcontrollers where + the Flash memory density ranges between 256 and 512 Kbytes. + - XL-density devices are STM32F101xx and STM32F103xx microcontrollers where + the Flash memory density ranges between 512 and 1024 Kbytes. + - Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers. + + * <h3><center>© COPYRIGHT 2011 STMicroelectronics</center></h3> + */ |