上海航芯ACM32G103开发板学习笔记07(DAC输出)

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上海航芯ACM32G103开发板学习笔记07(DAC输出) [复制链接]

 

==9：DAC输出==

9.1：DAC概述和主要特性

概述：

主要特性：

9.2：软件设计

首先查看数据手册，找出DAC输出功能引脚。

软件设计思路：

1：配置DAC输出引脚

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void DAC_GPIO_Init(void)
{
    __RCC_GPIOA_CLK_ENABLE();
        /* Initialization GPIO */
        /**DAC1 GPIO Configuration    
        PA4  ------> DAC_OUT1 
        PA5  ------> DAC_OUT2 
        */
    GPIO_InitTypeDef GPIO_handle;
    GPIO_handle.Drive = GPIO_DRIVE_LEVEL3;
    GPIO_handle.Mode = GPIO_MODE_ANALOG;
    GPIO_handle.Pin = GPIO_PIN_4|GPIO_PIN_5;
    GPIO_handle.Pull = GPIO_NOPULL;
    GPIO_Init(GPIOA,&GPIO_handle);

}

2：DAC时钟使能

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__RCC_DAC1_CLK_ENABLE();

3：DAC输出配置

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/******************************************************************************
* <a href="https://bbs.eeworld.com.cn/home.php?mod=space&uid=159083" target="_blank">@brief</a> : DAC Output config.
* @param : None.
* @return: None
******************************************************************************/
void DAC_Config_OutPut()
{
    DAC_InitTypeDef sConfig={0}; 

    sConfig.DAC_Trigger = DAC_TRIGGER_T6_TRGO;
    sConfig.DAC_Trigger2 = DAC_TRIGGER_T8_TRGO; 
    sConfig.DAC_SampleAndHold = DAC_SAMPLEANDHOLD_DISABLE;
    sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_DISABLE;
    sConfig.DAC_ConnectOnChipPeripheral = DAC_CHIPCONNECT_EXTERNAL;
    sConfig.DAC_UserTrimming = DAC_TRIMMING_FACTORY;
    DAC_Init(DAC,DAC_CHANNEL_1, &sConfig);    
    DAC_Init(DAC,DAC_CHANNEL_2, &sConfig);  
    DAC_Cmd(DAC, DAC_CHANNEL_1,ENABLE);
    DAC_Cmd(DAC, DAC_CHANNEL_2,ENABLE); 

}

4：配置DAC输出电压

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/******************************************************************************
* @brief : DAC output voltage initialization.
* @param : None.
* @return: None
******************************************************************************/
void DAC_Config_OutPut_Voltage()
{

    DAC_InitTypeDef sConfig; 
    sConfig.DAC_Trigger = DAC_TRIGGER_SOFTWARE;
    sConfig.DAC_Trigger2 = DAC_TRIGGER_SOFTWARE;
    sConfig.DAC_SampleAndHold = DAC_SAMPLEANDHOLD_DISABLE;
    sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_DISABLE;
    sConfig.DAC_ConnectOnChipPeripheral = DAC_CHIPCONNECT_EXTERNAL;  
    sConfig.DAC_UserTrimming = DAC_TRIMMING_FACTORY;

    DAC_Init(DAC,DAC_CHANNEL_1, &sConfig); 
    DAC_Init(DAC,DAC_CHANNEL_2, &sConfig); 

    /* 自动校准，可根据需要开启/关闭 */
    SPL_DACEx_SelfCalibrate(DAC, &sConfig,DAC_CHANNEL_1);
    SPL_DACEx_SelfCalibrate(DAC, &sConfig,DAC_CHANNEL_2);
    Delay_Simple(500000);
}

5：设置自定义电压值

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/******************************************************************************
* @brief : DAC output voltage.
* @param : voltage ：output voltage value.
* @return: None
******************************************************************************/
void DAC_OutPutVoltage(float voltage)
{
    if( voltage > 3.3)
    {
        return;
    }
    uint16_t data=((voltage / 3.3) * 4095);
    DAC_SetDualChannelData(DAC,DAC_ALIGN_12B_R,data,data);
    DAC_Cmd(DAC, DAC_CHANNEL_1,ENABLE);
    DAC_Cmd(DAC, DAC_CHANNEL_2,ENABLE); 
    DAC_SoftwareTriggerCmd(DAC, DAC_CHANNEL_1,ENABLE);
    DAC_SoftwareTriggerCmd(DAC, DAC_CHANNEL_2,ENABLE);
}

9.3：测试输出

编辑代码，设置PA4，PA5指定输出2V。

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void  bsp_init(void)
{
    RCC_ClocksTypeDef RCC_Clocks;

    #if (INS_ACCELERATE_ENABLE == 1)
        System_EnableIAccelerate();
    #endif

    #if (DATA_ACCELERATE_ENABLE == 1)
        System_EnableDAccelerate();
    #endif     

    /* Set Interrupt Group Priority */
    NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);

    SystemClock_Config();    

    SystemCoreClockUpdate();

    RCC_GetClocksFreq(&RCC_Clocks);

    SysTick_Config(RCC_Clocks.HCLK_Frequency / 1000);    

    /*串口2初始化*/
    BSP_UART_Init(115200);

    #ifdef USE_BSP_DAC
    BSP_DAC_Init();
    DAC_OutPutVoltage(2.0);
    #endif    



    DEBUG_LOG("bsp_init_ok");
}

使用万用表来测试PA4和PA5的输出电压值。

PA4输出电压：

PA5输出电压：