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[牛人杂谈] M051的模拟比较器 (ACMP)

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 楼主| zhuotuzi 发表于 2016-7-6 22:45 | 显示全部楼层 |阅读模式
ACM, 模拟比较器, 电压, ROM, 向量
模拟比较器 (ACMP)

NuMicro M05xxBN/DN/DE最多有4个比较器，可以在不同的配置下使用。当正端输入大于负端输入时，比较器输出逻辑”1”，否则输出”0”。 当比较器输出值改变，每个比较器可以配置发生中断。
特性
        模拟输入电压范围: 0~AVDD
        支持迟滞功能
        每个模拟比较器负端可以选择输入内部参考电压
        4/2个比较器共享2/1个中断向量


为何这里还多达呢，因为还要看具体型号。

  
  
M05xxBN
M05xxDN/DE
ACMP数量
2
4
ACMP 输出反转功能
-
●





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 楼主| zhuotuzi 发表于 2016-7-7 09:47 | 显示全部楼层
先看看普通用法。
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  1. /******************************************************************************
    

  2.  * [url=home.php?mod=space&uid=288409]@file[/url]     main.c
    

  3.  * [url=home.php?mod=space&uid=895143]@version[/url]  V3.00
    

  4.  * $Revision: 7 $
    

  5.  * $Date: 15/05/22 2:56p $
    

  6.  * [url=home.php?mod=space&uid=247401]@brief[/url]    Demonstrate how ACMP works with internal band-gap voltage.
    

  7.  *
    

  8.  * @note
    

  9.  * Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
    

  10. *****************************************************************************/
    

  11. #include <stdio.h>
    

  12. #include "M051Series.h"
    


  13. 

  14. /* Function prototype declaration */
    

  15. void SYS_Init(void);
    


  16. 

  17. int32_t main(void)
    

  18. {
    

  19.     /* Unlock protected registers */
    

  20.     SYS_UnlockReg();
    

  21.     /* Init System, IP clock and multi-function I/O. */
    

  22.     SYS_Init();
    

  23.     /* Lock protected registers */
    

  24.     SYS_LockReg();
    


  25. 

  26.     /* Configure UART0: 115200, 8-bit word, no parity bit, 1 stop bit. */
    

  27.     UART_Open(UART0, 115200);
    


  28. 

  29.     printf("\n\n");
    

  30.     printf("+---------------------------------------+\n");
    

  31.     printf("|         M051 ACMP Sample Code         |\n");
    

  32.     printf("+---------------------------------------+\n");
    


  33. 

  34.     printf("\nThis sample code demonstrates ACMP0 function. Using ACMP0_P (P1.5) as ACMP0\n");
    

  35.     printf("positive input and using internal band-gap voltage as the negative input\n");
    

  36.     printf("The compare result reflects on ACMP0_O (P3.6)\n");
    


  37. 

  38.     /* Configure ACMP0. Enable ACMP0 and select internal reference voltage as negative input. */
    

  39.     ACMP_Open(ACMP01, 0, ACMP_CR_VNEG_BANDGAP, ACMP_CR_HYSTERESIS_DISABLE);
    

  40.     /* Enable ACMP0 interrupt function */
    

  41.     ACMP_ENABLE_INT(ACMP01, 0);
    


  42. 

  43.     /* Enable ACMP01 interrupt */
    

  44.     NVIC_EnableIRQ(ACMP01_IRQn);
    


  45. 

  46.     while(1);
    


  47. 

  48. }
    


  49. 

  50. void ACMP01_IRQHandler(void)
    

  51. {
    

  52.     static uint32_t u32Cnt = 0;
    


  53. 

  54.     /* Clear ACMP 0 interrupt flag */
    

  55.     ACMP_CLR_INT_FLAG(ACMP01, 0);
    

  56.     /* Check Comparator 0 Output Status */
    

  57.     if(ACMP_GET_OUTPUT(ACMP01, 0))
    

  58.         printf("ACMP0_P voltage > Band-gap voltage (%d)\n", u32Cnt);
    

  59.     else
    

  60.         printf("ACMP0_P voltage <= Band-gap voltage (%d)\n", u32Cnt);
    


  61. 

  62.     u32Cnt++;
    

  63. }
    


  64. 


  65. 

  66. void SYS_Init(void)
    

  67. {
    

  68.     /*---------------------------------------------------------------------------------------------------------*/
    

  69.     /* Init System Clock                                                                                       */
    

  70.     /*---------------------------------------------------------------------------------------------------------*/
    


  71. 

  72.     /* Enable external 12MHz XTAL */
    

  73.     CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk);
    


  74. 

  75.     /* Waiting for clock ready */
    

  76.     CLK_WaitClockReady(CLK_CLKSTATUS_XTL12M_STB_Msk);
    


  77. 

  78.     /* Select HXT as the clock source of UART */
    

  79.     CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));
    


  80. 

  81.     /* Enable UART peripheral clock */
    

  82.     CLK_EnableModuleClock(UART0_MODULE);
    

  83.     /* Enable ACMP01 peripheral clock */
    

  84.     CLK_EnableModuleClock(ACMP01_MODULE);
    


  85. 

  86.     /* Update System Core Clock */
    

  87.     /* User can use SystemCoreClockUpdate() to calculate SystemCoreClock and CyclesPerUs automatically. */
    

  88.     SystemCoreClockUpdate();
    


  89. 


  90. 

  91.     /*---------------------------------------------------------------------------------------------------------*/
    

  92.     /* Init I/O Multi-function                                                                                 */
    

  93.     /*---------------------------------------------------------------------------------------------------------*/
    

  94.     /* Set P1.5 multi-function pin for ACMP0 positive input pin */
    

  95.     SYS->P1_MFP = SYS_MFP_P15_ACMP0_P;
    


  96. 

  97.     /* Disable digital input path of analog pin ACMP0_P to prevent leakage */
    

  98.     GPIO_DISABLE_DIGITAL_PATH(P1, BIT5);
    


  99. 

  100.     /* Set P3 multi-function pins for UART0 RXD, TXD and ACMP0 output */
    

  101.     SYS->P3_MFP = SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0 | SYS_MFP_P36_ACMP0_O;
    

  102. }
    


  103. 

  104. /*** (C) COPYRIGHT 2014 Nuvoton Technology Corp. ***/
    


  105.


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 楼主| zhuotuzi 发表于 2016-7-7 09:49 | 显示全部楼层
复制
  1. /******************************************************************************
    

  2.  * @file     main.c
    

  3.  * @version  V3.00
    

  4.  * $Revision: 7 $
    

  5.  * $Date: 15/05/22 2:56p $
    

  6.  * @brief    Demonstrate how ACMP works with internal band-gap voltage.
    

  7.  *
    

  8.  * @note
    

  9.  * Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
    

  10. *****************************************************************************/
    

  11. #include <stdio.h>
    

  12. #include "M051Series.h"
    


  13. 

  14. /* Function prototype declaration */
    

  15. void SYS_Init(void);
    


  16. 

  17. int32_t main(void)
    

  18. {
    

  19.     /* Unlock protected registers */
    

  20.     SYS_UnlockReg();
    

  21.     /* Init System, IP clock and multi-function I/O. */
    

  22.     SYS_Init();
    

  23.     /* Lock protected registers */
    

  24.     SYS_LockReg();
    


  25. 

  26.     /* Configure UART0: 115200, 8-bit word, no parity bit, 1 stop bit. */
    

  27.     UART_Open(UART0, 115200);
    


  28. 

  29.     printf("\n\n");
    

  30.     printf("+---------------------------------------+\n");
    

  31.     printf("|         M051 ACMP Sample Code         |\n");
    

  32.     printf("+---------------------------------------+\n");
    


  33. 

  34.     printf("\nThis sample code demonstrates ACMP0 function. Using ACMP0_P (P1.5) as ACMP0\n");
    

  35.     printf("positive input and using internal band-gap voltage as the negative input\n");
    

  36.     printf("The compare result reflects on ACMP0_O (P3.6)\n");
    


  37. 

  38.     /* Configure ACMP0. Enable ACMP0 and select internal reference voltage as negative input. */
    

  39.     ACMP_Open(ACMP01, 0, ACMP_CR_VNEG_BANDGAP, ACMP_CR_HYSTERESIS_DISABLE);
    

  40.     /* Enable ACMP0 interrupt function */
    

  41.     ACMP_ENABLE_INT(ACMP01, 0);
    


  42. 

  43.     /* Enable ACMP01 interrupt */
    

  44.     NVIC_EnableIRQ(ACMP01_IRQn);
    


  45. 

  46.     while(1);
    


  47. 

  48. }
    


  49. 

  50. void ACMP01_IRQHandler(void)
    

  51. {
    

  52.     static uint32_t u32Cnt = 0;
    


  53. 

  54.     /* Clear ACMP 0 interrupt flag */
    

  55.     ACMP_CLR_INT_FLAG(ACMP01, 0);
    

  56.     /* Check Comparator 0 Output Status */
    

  57.     if(ACMP_GET_OUTPUT(ACMP01, 0))
    

  58.         printf("ACMP0_P voltage > Band-gap voltage (%d)\n", u32Cnt);
    

  59.     else
    

  60.         printf("ACMP0_P voltage <= Band-gap voltage (%d)\n", u32Cnt);
    


  61. 

  62.     u32Cnt++;
    

  63. }
    


  64. 


  65. 

  66. void SYS_Init(void)
    

  67. {
    

  68.     /*---------------------------------------------------------------------------------------------------------*/
    

  69.     /* Init System Clock                                                                                       */
    

  70.     /*---------------------------------------------------------------------------------------------------------*/
    


  71. 

  72.     /* Enable external 12MHz XTAL */
    

  73.     CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk);
    


  74. 

  75.     /* Waiting for clock ready */
    

  76.     CLK_WaitClockReady(CLK_CLKSTATUS_XTL12M_STB_Msk);
    


  77. 

  78.     /* Select HXT as the clock source of UART */
    

  79.     CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));
    


  80. 

  81.     /* Enable UART peripheral clock */
    

  82.     CLK_EnableModuleClock(UART0_MODULE);
    

  83.     /* Enable ACMP01 peripheral clock */
    

  84.     CLK_EnableModuleClock(ACMP01_MODULE);
    


  85. 

  86.     /* Update System Core Clock */
    

  87.     /* User can use SystemCoreClockUpdate() to calculate SystemCoreClock and CyclesPerUs automatically. */
    

  88.     SystemCoreClockUpdate();
    


  89. 


  90. 

  91.     /*---------------------------------------------------------------------------------------------------------*/
    

  92.     /* Init I/O Multi-function                                                                                 */
    

  93.     /*---------------------------------------------------------------------------------------------------------*/
    

  94.     /* Set P1.5 multi-function pin for ACMP0 positive input pin */
    

  95.     SYS->P1_MFP = SYS_MFP_P15_ACMP0_P;
    


  96. 

  97.     /* Disable digital input path of analog pin ACMP0_P to prevent leakage */
    

  98.     GPIO_DISABLE_DIGITAL_PATH(P1, BIT5);
    


  99. 

  100.     /* Set P3 multi-function pins for UART0 RXD, TXD and ACMP0 output */
    

  101.     SYS->P3_MFP = SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0 | SYS_MFP_P36_ACMP0_O;
    

  102. }
    


  103. 

  104. /*** (C) COPYRIGHT 2014 Nuvoton Technology Corp. ***/
    


  105.


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 楼主| zhuotuzi 发表于 2016-7-7 09:51 | 显示全部楼层
This sample code demonstrates ACMP0 function. Using ACMP0_P (P1.5) as ACMP0positive input and using internal band-gap voltage as the negative input
The compare result reflects on ACMP0_O (P3.6)


    /* Configure ACMP0. Enable ACMP0 and select internal reference voltage as negative input. */
    ACMP_Open(ACMP01, 0, ACMP_CR_VNEG_BANDGAP, ACMP_CR_HYSTERESIS_DISABLE);
    /* Enable ACMP0 interrupt function */
    ACMP_ENABLE_INT(ACMP01, 0);

    /* Enable ACMP01 interrupt */
    NVIC_EnableIRQ(ACMP01_IRQn);


我们看到这个是会产生中断的。
中断处理函数为
void ACMP01_IRQHandler(void)
{
    static uint32_t u32Cnt = 0;

    /* Clear ACMP 0 interrupt flag */
    ACMP_CLR_INT_FLAG(ACMP01, 0);
    /* Check Comparator 0 Output Status */
    if(ACMP_GET_OUTPUT(ACMP01, 0))
        printf("ACMP0_P voltage > Band-gap voltage (%d)\n", u32Cnt);
    else
        printf("ACMP0_P voltage <= Band-gap voltage (%d)\n", u32Cnt);

    u32Cnt++;
}


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 楼主| zhuotuzi 发表于 2016-7-7 09:59 | 显示全部楼层
另外一个功能就是唤醒断电模式的系统了。就好比关机或者休眠后的唤醒。
复制
  1. /******************************************************************************
    

  2.  * @file     main.c
    

  3.  * @version  V3.00
    

  4.  * $Revision: 2 $
    

  5.  * $Date: 15/05/22 2:58p $
    

  6.  * @brief    Show how to wake up MCU from Power-down mode by ACMP wake-up function.
    

  7.  *
    

  8.  * @note
    

  9.  * Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
    

  10. *****************************************************************************/
    

  11. #include <stdio.h>
    

  12. #include "M051Series.h"
    


  13. 

  14. /* Function prototype declaration */
    

  15. void SYS_Init(void);
    

  16. void PowerDownFunction(void);
    

  17. int IsDebugFifoEmpty(void);
    


  18. 

  19. int32_t main(void)
    

  20. {
    

  21.     uint32_t u32DelayCount;
    


  22. 

  23.     /* Unlock protected registers */
    

  24.     SYS_UnlockReg();
    

  25.     /* Init System, IP clock and multi-function I/O. */
    

  26.     SYS_Init();
    

  27.     /* Lock protected registers */
    

  28.     SYS_LockReg();
    


  29. 

  30.     /* Configure UART0: 115200, 8-bit word, no parity bit, 1 stop bit. */
    

  31.     UART_Open(UART0, 115200);
    


  32. 

  33.     printf("\n\n");
    

  34.     printf("+---------------------------------------+\n");
    

  35.     printf("|         M051 ACMP Sample Code         |\n");
    

  36.     printf("+---------------------------------------+\n");
    


  37. 

  38.     printf("\nThis sample code demonstrates ACMP0 wake-up function. Using ACMP0_P (P1.5) as ACMP0\n");
    

  39.     printf("positive input and using internal band-gap voltage as the negative input.\n");
    

  40.     printf("The compare result reflects on ACMP0_O (P3.6).\n");
    


  41. 

  42.     printf("When the voltage of the positive input is greater than the voltage of the negative input,\n");
    

  43.     printf("the analog comparator outputs logical one; otherwise, it outputs logical zero.\n");
    

  44.     printf("This chip will be waked up from power down mode when detecting a transition of analog comparator's output.\n");
    

  45.     printf("Press any key to enter power down mode ...");
    

  46.     getchar();
    

  47.     printf("\n");
    


  48. 

  49.     /* Configure ACMP0. Enable ACMP0 and select internal reference voltage as negative input. */
    

  50.     ACMP_Open(ACMP01, 0, ACMP_CR_VNEG_BANDGAP, ACMP_CR_HYSTERESIS_DISABLE);
    

  51.     __NOP();
    

  52.     for(u32DelayCount = 0; u32DelayCount < 100; u32DelayCount++); /* For ACMP setup time */
    

  53.     __NOP();
    

  54.     /* Clear ACMP 0 interrupt flag */
    

  55.     ACMP_CLR_INT_FLAG(ACMP01, 0);
    

  56.     
    

  57.     /* Enable ACMP0 interrupt function */
    

  58.     ACMP_ENABLE_INT(ACMP01, 0);
    


  59. 

  60.     /* Enable ACMP01 interrupt */
    

  61.     NVIC_EnableIRQ(ACMP01_IRQn);
    


  62. 

  63.     /* To program PWRCTL register, it needs to disable register protection first. */
    

  64.     SYS_UnlockReg();
    

  65.     PowerDownFunction();
    

  66.     printf("Wake up by ACMP0!\n");
    

  67.     while(1);
    


  68. 

  69. }
    


  70. 

  71. void ACMP01_IRQHandler(void)
    

  72. {
    

  73.     printf("\nACMP0 interrupt!\n");
    

  74.     /* Disable interrupt */
    

  75.     ACMP_DISABLE_INT(ACMP01, 0);
    

  76.     /* Clear ACMP 0 interrupt flag */
    

  77.     ACMP_CLR_INT_FLAG(ACMP01, 0);
    

  78. }
    


  79. 


  80. 

  81. void SYS_Init(void)
    

  82. {
    

  83.     /*---------------------------------------------------------------------------------------------------------*/
    

  84.     /* Init System Clock                                                                                       */
    

  85.     /*---------------------------------------------------------------------------------------------------------*/
    


  86. 

  87.     /* Enable external 12MHz XTAL */
    

  88.     CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk);
    


  89. 

  90.     /* Waiting for clock ready */
    

  91.     CLK_WaitClockReady(CLK_CLKSTATUS_XTL12M_STB_Msk);
    


  92. 

  93.     /* Select HXT as the clock source of UART */
    

  94.     CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));
    


  95. 

  96.     /* Enable UART peripheral clock */
    

  97.     CLK_EnableModuleClock(UART0_MODULE);
    

  98.     /* Enable ACMP01 peripheral clock */
    

  99.     CLK_EnableModuleClock(ACMP01_MODULE);
    


  100. 

  101.     /* Update System Core Clock */
    

  102.     /* User can use SystemCoreClockUpdate() to calculate SystemCoreClock and CyclesPerUs automatically. */
    

  103.     SystemCoreClockUpdate();
    


  104. 


  105. 

  106.     /*---------------------------------------------------------------------------------------------------------*/
    

  107.     /* Init I/O Multi-function                                                                                 */
    

  108.     /*---------------------------------------------------------------------------------------------------------*/
    

  109.     /* Set P1.5 multi-function pin for ACMP0 positive input pin */
    

  110.     SYS->P1_MFP = SYS_MFP_P15_ACMP0_P;
    


  111. 

  112.     /* Disable digital input path of analog pin ACMP0_P to prevent leakage */
    

  113.     GPIO_DISABLE_DIGITAL_PATH(P1, BIT5);
    


  114. 

  115.     /* Set P3 multi-function pins for UART0 RXD, TXD and ACMP0 output */
    

  116.     SYS->P3_MFP = SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0 | SYS_MFP_P36_ACMP0_O;
    

  117. }
    


  118. 

  119. void PowerDownFunction(void)
    

  120. {
    

  121.     printf("\nSystem enter power-down mode ... ");
    


  122. 

  123.     /* To check if all the debug messages are finished */
    

  124.     while(IsDebugFifoEmpty() == 0);
    


  125. 

  126.     /* Deep sleep mode is selected */
    

  127.     SCB->SCR = SCB_SCR_SLEEPDEEP_Msk;
    


  128. 

  129.     /* To program PWRCTL register, it needs to disable register protection first. */
    

  130.     CLK->PWRCON &= ~(CLK_PWRCON_PD_WAIT_CPU_Msk | CLK_PWRCON_PWR_DOWN_EN_Msk);
    

  131.     CLK->PWRCON |= (CLK_PWRCON_PD_WAIT_CPU_Msk | CLK_PWRCON_PWR_DOWN_EN_Msk | CLK_PWRCON_PD_WU_INT_EN_Msk);
    


  132. 

  133.     __WFI();
    

  134. }
    


  135. 

  136. /*** (C) COPYRIGHT 2014 Nuvoton Technology Corp. ***/
    


  137.


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 楼主| zhuotuzi 发表于 2016-7-7 10:01 | 显示全部楼层
/* Configure ACMP0. Enable ACMP0 and select internal reference voltage as negative input. */
    ACMP_Open(ACMP01, 0, ACMP_CR_VNEG_BANDGAP, ACMP_CR_HYSTERESIS_DISABLE);
    __NOP();
    for(u32DelayCount = 0; u32DelayCount < 100; u32DelayCount++); /* For ACMP setup time */
    __NOP();
    /* Clear ACMP 0 interrupt flag */
    ACMP_CLR_INT_FLAG(ACMP01, 0);

    /* Enable ACMP0 interrupt function */
    ACMP_ENABLE_INT(ACMP01, 0);

    /* Enable ACMP01 interrupt */
    NVIC_EnableIRQ(ACMP01_IRQn);

    /* To program PWRCTL register, it needs to disable register protection first. */
    SYS_UnlockReg();
    PowerDownFunction();
    printf("Wake up by ACMP0!\n");
——————————————————————————
我们从这看，系统使用了断电函数。
其他地方是一样的，下面是中断处理的不同，这里有关闭中断，清除中断标志，这是因为这个就是一次实验。模拟系统通过这种方式开机。
void ACMP01_IRQHandler(void)
{
    printf("\nACMP0 interrupt!\n");
    /* Disable interrupt */
    ACMP_DISABLE_INT(ACMP01, 0);
    /* Clear ACMP 0 interrupt flag */
    ACMP_CLR_INT_FLAG(ACMP01, 0);
}


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 楼主| zhuotuzi 发表于 2016-7-7 10:06 | 显示全部楼层
当然系统初始化的时候是要配置功能的。

    /*---------------------------------------------------------------------------------------------------------*/
    /* Init I/O Multi-function                                                                                 */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Set P1.5 multi-function pin for ACMP0 positive input pin */
    SYS->P1_MFP = SYS_MFP_P15_ACMP0_P;

    /* Disable digital input path of analog pin ACMP0_P to prevent leakage */
    GPIO_DISABLE_DIGITAL_PATH(P1, BIT5);

    /* Set P3 multi-function pins for UART0 RXD, TXD and ACMP0 output */
    SYS->P3_MFP = SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0 | SYS_MFP_P36_ACMP0_O;
}

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 楼主| zhuotuzi 发表于 2016-7-7 10:08 | 显示全部楼层
配置时候可参看这个图。
1111.png 2.png
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 楼主| zhuotuzi 发表于 2016-7-7 10:11 | 显示全部楼层
断电的方式是
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  1. void PowerDownFunction(void)
    

  2. {
    

  3.     printf("\nSystem enter power-down mode ... ");
    


  4. 

  5.     /* To check if all the debug messages are finished */
    

  6.     while(IsDebugFifoEmpty() == 0);
    


  7. 

  8.     /* Deep sleep mode is selected */
    

  9.     SCB->SCR = SCB_SCR_SLEEPDEEP_Msk;
    


  10. 

  11.     /* To program PWRCTL register, it needs to disable register protection first. */
    

  12.     CLK->PWRCON &= ~(CLK_PWRCON_PD_WAIT_CPU_Msk | CLK_PWRCON_PWR_DOWN_EN_Msk);
    

  13.     CLK->PWRCON |= (CLK_PWRCON_PD_WAIT_CPU_Msk | CLK_PWRCON_PWR_DOWN_EN_Msk | CLK_PWRCON_PD_WU_INT_EN_Msk);
    


  14. 

  15.     __WFI();
    

  16. }


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Micachl 发表于 2016-7-9 20:59 | 显示全部楼层
这个单片机有没有类似模拟开关的功能？
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