F280049M外部GPIO触发ADC数据采集

72 阅读 0 评论 48 点赞

我是靠谱客的博主务实牛排，最近开发中收集的这篇文章主要介绍F280049M外部GPIO触发ADC数据采集，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

新手小白，刚刚开始学习DSP，将自己的过程记录下来。（自用记录，防止遗忘！）

1. 首先要了解GPIO模块

查阅手册可知，ADC转换的外部触发有以下5种，故若采用GPIO触发，需用到XINT2引脚。

– S/W - software immediate start

– All ePWMs - ADCSOC A or B

– GPIO XINT2

– CPU Timers 0/1/2

– ADCINT1/2

同时得知280049M的XINT2号引脚与input5 相连。因此在设置触发时，只需要将XINT2进行相关配置即可产生出发。

2. 在确认完相关手册信息后，再对GPIO进行初始化配置，结合上一章软件触发的程序进行修改即可。

下面是对GPIO15号引脚进行直接输入高电平触发（该程序可初步实现上电一次出发一次，但存在抖动等因素，具有非准确性，其实可以加一个延时函数，消抖动即可。后面本人采用了两个GPIO直接进行拉高拉低上电，解放双手。。。）

#include "driverlib.h"
#include "device.h"

uint16_t a1[1024] = {0};
uint16_t a2[1024] = {0};
uint16_t a3[1024] = {0};
uint16_t a4[1024] = {0};
uint16_t a5[1024] = {0};
uint16_t a6[1024] = {0};
uint16_t i = 0 ,j = 0 ;
uint16_t p = 0 ,q = 0 ;
uint16_t u = 0 ,v = 0 ;

void initADCs(void);
void initADCSOCs(void);
void initExintGPIO(void);

int testCount=0;
interrupt void xint2ISR(void)
{
    testCount++;

    Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP1);
}
void main(void)
{
    Device_init();                                       //初始化设备时钟和外设
    Device_initGPIO();                                   //禁用引脚锁并启用内部上拉
    Interrupt_initModule();                              //初始化PIE并清除PIE寄存器。禁用CPU中断。
    Interrupt_initVectorTable();                         //用指向shell中断的指针初始化PIE向量表ISR服务程序。

    // 初始化ADC，初始化SOC
    initADCs();
    initADCSOCs();
    initExintGPIO();

    EINT;                                                //打开全局中断
    ERTM;                                                //当使用仿真器调试时 开启DEBUG中断


    while(1)
    {
        // 等待ADC转换完成，并清除中断标志位
        while(ADC_getInterruptStatus(ADCA_BASE, ADC_INT_NUMBER1) == false)
        {
        }
        ADC_clearInterruptStatus(ADCA_BASE, ADC_INT_NUMBER1);

        while(ADC_getInterruptStatus(ADCB_BASE, ADC_INT_NUMBER1)== false)
        {
        }
        ADC_clearInterruptStatus(ADCB_BASE, ADC_INT_NUMBER1);

        while(ADC_getInterruptStatus(ADCC_BASE, ADC_INT_NUMBER1) == false)
        {
        }
        ADC_clearInterruptStatus(ADCC_BASE, ADC_INT_NUMBER1);

        a1[i++] = ADC_readResult(ADCARESULT_BASE, ADC_SOC_NUMBER0);
//        if(i >= sizeof(a1) / sizeof(a1[0]))  //(400/4=100)同i>=100,此方法不用修改两处，只用将定义数组处的数组内数据随意修改即可。
//存储结果
        if(i >= 1024)
        {
            i=0;
        }

        a2[j++] = ADC_readResult(ADCARESULT_BASE, ADC_SOC_NUMBER1);
        if(j >= 1024)
        {
            j=0;
        }

        a3[p++] = ADC_readResult(ADCBRESULT_BASE, ADC_SOC_NUMBER0);
        if(p >= 1024)
        {
            p=0;
        }

        a4[q++] = ADC_readResult(ADCBRESULT_BASE, ADC_SOC_NUMBER1);
        if(q >= 1024)
        {
            q=0;
        }

        a5[u++] = ADC_readResult(ADCCRESULT_BASE, ADC_SOC_NUMBER0);
        if(u >= 1024)
        {
            u=0;
        }

        a6[v++] = ADC_readResult(ADCCRESULT_BASE, ADC_SOC_NUMBER1);
        if(v >= 1024)
        {
            v=0;
        }
    }
}

// 初始化ADC
void initADCs(void)
{
    // ADC使用片内参考3.3V
    // Setup VREF as internal
    ADC_setVREF(ADCA_BASE, ADC_REFERENCE_INTERNAL, ADC_REFERENCE_3_3V);
    ADC_setVREF(ADCB_BASE, ADC_REFERENCE_INTERNAL, ADC_REFERENCE_3_3V);
    ADC_setVREF(ADCC_BASE, ADC_REFERENCE_INTERNAL, ADC_REFERENCE_3_3V);

    // ADC时钟4分频
    // Set ADCCLK divider to /4
    ADC_setPrescaler(ADCA_BASE, ADC_CLK_DIV_4_0);
    ADC_setPrescaler(ADCB_BASE, ADC_CLK_DIV_4_0);
    ADC_setPrescaler(ADCC_BASE, ADC_CLK_DIV_4_0);

    // 设置转换结束时触发中断
    // Set pulse positions to late
    ADC_setInterruptPulseMode(ADCA_BASE, ADC_PULSE_END_OF_CONV);
    ADC_setInterruptPulseMode(ADCB_BASE, ADC_PULSE_END_OF_CONV);
    ADC_setInterruptPulseMode(ADCC_BASE, ADC_PULSE_END_OF_CONV);

    // 启动AD并延迟1ms
    // Power up the ADCs and then delay for 1 ms
    ADC_enableConverter(ADCA_BASE);
    ADC_enableConverter(ADCB_BASE);
    ADC_enableConverter(ADCC_BASE);
    DEVICE_DELAY_US(1000);  //在ADC转换前要延迟一段时间
}

void initExintGPIO(void)
{

    Interrupt_register(INT_XINT2, &xint2ISR);
    Interrupt_enable(INT_XINT2);                      // 使能 XINT2 中断

    GPIO_setPinConfig(GPIO_15_GPIO15);             // GPIO15 复用为GPIO功能
    GPIO_setDirectionMode(15, GPIO_DIR_MODE_IN);   // GPIO15 设置为输入
    GPIO_setQualificationMode(15, GPIO_QUAL_SYNC);  //GPIO15 的时钟周期同系统时钟周期

    GPIO_setInterruptPin(15, GPIO_INT_XINT2);                          // XINT2 connected to GPIO15
//    GPIO_setInterruptType(GPIO_INT_XINT2, GPIO_INT_TYPE_FALLING_EDGE);  //下降沿
    GPIO_setInterruptType(GPIO_INT_XINT2, GPIO_INT_TYPE_RISING_EDGE);  // XINT2 对应GPIO 15 ，上升沿触发（因为电压起初是低电平）
    GPIO_enableInterrupt(GPIO_INT_XINT2);                              //使能XINT2 中断

}


// 初始化ADCSOC
void initADCSOCs(void)
{
    // 采样窗口持续10个系统时钟
    // - SOC0 will convert pin A0 with a sample window of 10 SYSCLK cycles.
    // - SOC1 will convert pin A1 with a sample window of 10 SYSCLK cycles.
    //
//    ADC_setupSOC(ADCA_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_SW_ONLY, ADC_CH_ADCIN0, 10);
//    ADC_setupSOC(ADCA_BASE, ADC_SOC_NUMBER1, ADC_TRIGGER_SW_ONLY, ADC_CH_ADCIN1, 10);
      ADC_setupSOC(ADCA_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_GPIO, ADC_CH_ADCIN0, 10);
      ADC_setupSOC(ADCA_BASE, ADC_SOC_NUMBER1, ADC_TRIGGER_GPIO, ADC_CH_ADCIN1, 10);

    // 设置中断为ADCINT1，并启用
    // Set SOC1 to set the interrupt 1 flag. Enable the interrupt and make
    // sure its flag is cleared.
    ADC_setInterruptSource(ADCA_BASE, ADC_INT_NUMBER1, ADC_SOC_NUMBER1);
    ADC_enableInterrupt(ADCA_BASE, ADC_INT_NUMBER1);
    ADC_clearInterruptStatus(ADCA_BASE, ADC_INT_NUMBER1);

    // 采样窗口持续10个系统时钟
    // - SOC0 will convert pin B0 with a sample window of 10 SYSCLK cycles.
    // - SOC1 will convert pin B1 with a sample window of 10 SYSCLK cycles.
    //
//    ADC_setupSOC(ADCB_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_SW_ONLY, ADC_CH_ADCIN0, 10);
//    ADC_setupSOC(ADCB_BASE, ADC_SOC_NUMBER1, ADC_TRIGGER_SW_ONLY, ADC_CH_ADCIN1, 10);
    ADC_setupSOC(ADCB_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_GPIO, ADC_CH_ADCIN0, 10);
    ADC_setupSOC(ADCB_BASE, ADC_SOC_NUMBER1, ADC_TRIGGER_GPIO, ADC_CH_ADCIN1, 10);
    // 设置中断为ADCINT1，并启用
    // Set SOC1 to set the interrupt 1 flag. Enable the interrupt and make
    // sure its flag is cleared.
    ADC_setInterruptSource(ADCB_BASE, ADC_INT_NUMBER1, ADC_SOC_NUMBER1);
    ADC_enableInterrupt(ADCB_BASE, ADC_INT_NUMBER1);
    ADC_clearInterruptStatus(ADCB_BASE, ADC_INT_NUMBER1);


//    ADC_setupSOC(ADCC_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_SW_ONLY, ADC_CH_ADCIN15, 10);
//    ADC_setupSOC(ADCC_BASE, ADC_SOC_NUMBER1, ADC_TRIGGER_SW_ONLY, ADC_CH_ADCIN15, 10);
    ADC_setupSOC(ADCC_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_GPIO, ADC_CH_ADCIN15, 10);
    ADC_setupSOC(ADCC_BASE, ADC_SOC_NUMBER1, ADC_TRIGGER_GPIO, ADC_CH_ADCIN15, 10);
    // 设置中断为ADCINT1，并启用
    // Set SOC1 to set the interrupt 1 flag. Enable the interrupt and make
    // sure its flag is cleared.
    ADC_setInterruptSource(ADCC_BASE, ADC_INT_NUMBER1, ADC_SOC_NUMBER1);
    ADC_enableInterrupt(ADCC_BASE, ADC_INT_NUMBER1);
    ADC_clearInterruptStatus(ADCC_BASE, ADC_INT_NUMBER1);
}