为何通道3会低于预期的输出电压？

我一直在为面包板上的STM8S103F3开发一些应用程序，我最近将其中一个项目转移到了STM8S Discovery板上，我发现了一些我无法解决的行为差异。


该程序使用PWM模式2在定时器1通道3上输出60 uS方波。在面包板上的STM8S103F3上，程序工作正常，我得到0到3.3V的方波。

在发现板上，我的方波具有正确的频率，但输出电压峰峰值仅为280 mV。我连接到Discovery板的唯一事情是USB连接和连接到定时器输出和接地的示波器。

我使用IAR作为开发环境，并相应地修改了包含文件和项目选项。

我可能会出错的任何想法？我是否正确假设如果应用程序在STM8S103F3上运行，那么它将在Discovery板上运行，假设我更改了包含文件和目标芯片？

该应用程序的代码包含在下面。

问候，
标记

＆amp; sharpinclude＆lt; intrinsics.h＆gt;
＆amp; sharpinclude＆lt; iostm8s103f3.h＆gt;


//
//使用内部振荡器将系统时钟设置为16MHz。
//
void InitialiseSystemClock（）
{
CLK_ICKR = 0; //重置内部时钟寄存器。
CLK_ICKR_HSIEN = 1; //启用HSI。
CLK_ECKR = 0; //禁用外部时钟。
while（CLK_ICKR_HSIRDY == 0）; //等待HSI准备好使用。
CLK_CKDIVR = 0; //确保时钟全速运行。
CLK_PCKENR1 = 0xff; //启用所有外设时钟。
CLK_PCKENR2 = 0xff; //同上
CLK_CCOR = 0; //关闭CCO。
CLK_HSITRIMR = 0; //关闭任何HSIU修剪。
CLK_SWIMCCR = 0; //将SWIM设置为以时钟/ 2运行。
CLK_SWR = 0xe1; //使用HSI作为时钟源。
CLK_SWCR = 0; //复位时钟切换控制寄存器。
CLK_SWCR_SWEN = 1; //启用切换。
while（CLK_SWCR_SWBSY！= 0）; //时钟开关忙时暂停
}


//
//初始化计时器1。
//
void InitialiseTimer1（）
{
TIM1_CR1 = 0;
TIM1_CR2 = 0;
TIM1_SMCR = 0;
TIM1_ETR = 0;
TIM1_IER = 0;
TIM1_SR2 = 0;
TIM1_CCER1 = 0;
TIM1_CCER2 = 0;
TIM1_CCMR1 = 0;
TIM1_CCMR2 = 0;
TIM1_CCMR3 = 0;
TIM1_CCMR4 = 0;
TIM1_CCER1 = 0;
TIM1_CCER2 = 0;
TIM1_CCMR1 = 0;
TIM1_CCMR2 = 0;
TIM1_CCMR3 = 0;
TIM1_CCMR4 = 0;
TIM1_CNTRH = 0;
TIM1_CNTRL = 0;
TIM1_PSCRH = 0;
TIM1_PSCRL = 0;
TIM1_ARRH = 0;
TIM1_ARRL = 0;
TIM1_CCR1H = 0;
TIM1_CCR1L = 0;
TIM1_CCR2H = 0;
TIM1_CCR2L = 0;
TIM1_CCR3H = 0;
TIM1_CCR3L = 0;
TIM1_CCR4H = 0;
TIM1_CCR4L = 0;
TIM1_OISR = 0;
TIM1_EGR = 0x01;
TIM1_DTR = 0;
TIM1_BKR = 0;
TIM1_RCR = 0;
TIM1_SR1 = 0;
}


//
//设置定时器1，通道3输出持续30 uS的单脉冲。
//
void SetupTimer1（）
{
TIM1_ARRH = 0x03; //重新加载计数器= 960
TIM1_ARRL = 0xc0;
TIM1_PSCRH = 0; // Prescalar = 0（即1）
TIM1_PSCRL = 0;
TIM1_CR1_DIR = 0; //向上计数器。
TIM1_CR1_CMS = 0; //边缘对齐计数器。
TIM1_RCR = 0; //没有重复
//
//现在配置定时器1，通道3。
//
TIM1_CCMR3_OC3M = 7; //设置为使用PWM模式2。
TIM1_CCER2_CC3E = 1; //输出已启用。
TIM1_CCER2_CC3P = 0; // Active定义为高。
TIM1_CCR3H = 0x01; // 480 = 50％占空比（基于TIM1_ARR）。
TIM1_CCR3L = 0xe0;
TIM1_BKR_MOE = 1; //启用主输出。
// TIM1_CR1_OPM = 1;
TIM1_CR1_CEN = 1;
}


//
//主程序循环
//
void main（）
{
//
//初始化系统。
//
__disable_interrupt（）;
InitialiseSystemClock（）;
InitialiseTimer1（）;
SetupTimer1（）;
__enable_interrupt（）;
而（1）
{
__wait_for_interrupt（）;
}
}
＃stm8s103f3发现定时器



以下为原文





I have been developing some applications for the STM8S103F3 which I have on breadboard and I have recently transferred one of the projects to the STM8S Discovery board and I am finding a difference in behaviour which I cannot work out.


The program uses PWM Mode 2 to output a 60 uS square wave on timer 1 channel3.  On the STM8S103F3 on breadboard the program works fine and I get a 0 to 3.3V square wave.

On the Discovery board I have the square wave with the right frequency but the output voltage is only 280 mV peak-to-peak.  The only things I have connected to the Discovery board are the USB connection and the scope connected to the timer output and ground.

I am using IAR as the development environment and I have modified the include files and project options accordingly.

Any ideas where I could be going wrong? Am I correct in assuming that if the app runs on the STM8S103F3 then it will run on the Discovery board assuming I change the include file and target chip?

The code for the application is included below.

Regards,
Mark

&sharpinclude
&sharpinclude


//
//  Setup the system clock to run at 16MHz using the internal oscillator.
//
void InitialiseSystemClock()
{
    CLK_ICKR = 0;                       //  Reset the Internal Clock Register.
    CLK_ICKR_HSIEN = 1;                 //  Enable the HSI.
    CLK_ECKR = 0;                       //  Disable the external clock.
    while (CLK_ICKR_HSIRDY == 0);       //  Wait for the HSI to be ready for use.
    CLK_CKDIVR = 0;                     //  Ensure the clocks are running at full speed.
    CLK_PCKENR1 = 0xff;                 //  Enable all peripheral clocks.
    CLK_PCKENR2 = 0xff;                 //  Ditto.
    CLK_CCOR = 0;                       //  Turn off CCO.
    CLK_HSITRIMR = 0;                   //  Turn off any HSIU trimming.
    CLK_SWIMCCR = 0;                    //  Set SWIM to run at clock / 2.
    CLK_SWR = 0xe1;                     //  Use HSI as the clock source.
    CLK_SWCR = 0;                       //  Reset the clock switch control register.
    CLK_SWCR_SWEN = 1;                  //  Enable switching.
    while (CLK_SWCR_SWBSY != 0);        //  Pause while the clock switch is busy.
}


//
//  Initialise Timer 1.
//
void InitialiseTimer1()
{
    TIM1_CR1 = 0;
    TIM1_CR2 = 0;
    TIM1_SMCR = 0;
    TIM1_ETR = 0;
    TIM1_IER  = 0;
    TIM1_SR2  = 0;
    TIM1_CCER1 = 0;
    TIM1_CCER2 = 0;
    TIM1_CCMR1 = 0;
    TIM1_CCMR2 = 0;
    TIM1_CCMR3 = 0;
    TIM1_CCMR4 = 0;
    TIM1_CCER1 = 0;
    TIM1_CCER2 = 0;
    TIM1_CCMR1 = 0;
    TIM1_CCMR2 = 0;
    TIM1_CCMR3 = 0;
    TIM1_CCMR4 = 0;
    TIM1_CNTRH = 0;
    TIM1_CNTRL = 0;
    TIM1_PSCRH = 0;
    TIM1_PSCRL = 0;
    TIM1_ARRH  = 0;
    TIM1_ARRL  = 0;
    TIM1_CCR1H = 0;
    TIM1_CCR1L = 0;
    TIM1_CCR2H = 0;
    TIM1_CCR2L = 0;
    TIM1_CCR3H = 0;
    TIM1_CCR3L = 0;
    TIM1_CCR4H = 0;
    TIM1_CCR4L = 0;
    TIM1_OISR  = 0;
    TIM1_EGR   = 0x01;
    TIM1_DTR   = 0;
    TIM1_BKR   = 0;
    TIM1_RCR   = 0;
    TIM1_SR1   = 0;
}


//
//  Set up Timer 1, channel 3 to output a single pulse lasting 30 uS.
//
void SetupTimer1()
{
    TIM1_ARRH = 0x03;       //  Reload counter = 960
    TIM1_ARRL = 0xc0;
    TIM1_PSCRH = 0;         //  Prescalar = 0 (i.e. 1)
    TIM1_PSCRL = 0;
    TIM1_CR1_DIR = 0;       //  Up counter.
    TIM1_CR1_CMS = 0;       //  Edge aligned counter.
    TIM1_RCR = 0;           //  No repetition.
    //
    //  Now configure Timer 1, channel 3.
    //
    TIM1_CCMR3_OC3M = 7;    //  Set up to use PWM mode 2.
    TIM1_CCER2_CC3E = 1;    //  Output is enabled.
    TIM1_CCER2_CC3P = 0;    //  Active is defined as high.
    TIM1_CCR3H = 0x01;      //  480 = 50% duty cycle (based on TIM1_ARR).
    TIM1_CCR3L = 0xe0;
    TIM1_BKR_MOE = 1;       //  Enable the main output.
//    TIM1_CR1_OPM = 1;
    TIM1_CR1_CEN = 1;
}


//
//  Main program loop.
//
void main()
{
    //
    //  Initialise the system.
    //
    __disable_interrupt();
    InitialiseSystemClock();
    InitialiseTimer1();
    SetupTimer1();
    __enable_interrupt();
    while (1)
    {
        __wait_for_interrupt();
    }
}  
#stm8s103f3-discovery-timer

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