DSP学习(一)GPIO操作00 建立开发版与仿真器的连接2 软件编程

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00 建立开发版与仿真器的连接

打开文件TMS320F28335.ccxml
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建立连接

显示下述信息说明连接成功

2 软件编程

1 系统时钟初始化

振荡器OSC和锁相环PLL初始化

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注意：
在写PLLCR寄存器前，PLLSTS[DIVSEL]必须是0。

初始化函数

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InitSysCtrl();

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void InitSysCtrl(void)
{
    //
    // Disable the watchdog
    //
    DisableDog();

    //
    // Initialize the PLL control: PLLCR and DIVSEL
    // DSP28_PLLCR and DSP28_DIVSEL are defined in DSP2833x_Examples.h
    //
    InitPll(DSP28_PLLCR, DSP28_DIVSEL); // f=30M * DSP28_PLLCR / DSP28_DIVSEL  =100MHZ

    //
    // Initialize the peripheral clocks
    //
    InitPeripheralClocks(); //使能外设时钟
}

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        // Optional: Wait for PLL to lock.
        // During this time the CPU will switch to OSCCLK/2 until
        // the PLL is stable.  Once the PLL is stable the CPU will
        // switch to the new PLL value.
        //
        // This time-to-lock is monitored by a PLL lock counter.
        //
        // Code is not required to sit and wait for the PLL to lock.
        // However, if the code does anything that is timing critical,
        // and requires the correct clock be locked, then it is best to
        // wait until this switching has completed.

//可选：等待PLL锁定。
//在此期间，CPU将切换至OSCCLK/2，直到
//锁相环是稳定的。一旦PLL稳定，CPU将
//切换到新的PLL值。
//
//锁定时间由PLL锁定计数器监控。
//
//代码不需要等待PLL锁定。
//但是，如果代码执行任何对时间至关重要的操作，
//并且需要锁定正确的时钟，那么最好
//等待此切换完成。

使能外设时钟

使能有关外设时钟的寄存器为PCLKCR0/1/3,GPIO初始化在PCLKCR3中
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SysCtrlRegs.PCLKCR3.bit.GPIOINENCLK = 1; // GPIO input clock

2 初始化GPIO

On the 2833x devices, up to three independent peripheral signals are multiplexed on a single GPIO-enabled pin in addition to individual pin bit I/O capability. There are three 32-bit I/O ports. Port A consists of GPIO0-GPIO31, port B consists of GPIO32-GPIO63, and port C consists of GPIO64-87.
Figure 4-1 shows the basic modes of operation for the GPIO module.
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初始化函数

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    InitGpio();

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void InitGpio(void)
{
    EALLOW;

//
    // Each GPIO pin can be:
    // a) a GPIO input/output
    // b) peripheral function 1
    // c) peripheral function 2
    // d) peripheral function 3
    // By default, all are GPIO Inputs
    //
    GpioCtrlRegs.GPAMUX1.all = 0x0000; // GPIO functionality GPIO0-GPIO15
    GpioCtrlRegs.GPAMUX2.all = 0x0000; // GPIO functionality GPIO16-GPIO31
    GpioCtrlRegs.GPBMUX1.all = 0x0000; // GPIO functionality GPIO32-GPIO39
    GpioCtrlRegs.GPBMUX2.all = 0x0000; // GPIO functionality GPIO48-GPIO63
    GpioCtrlRegs.GPCMUX1.all = 0x0000; // GPIO functionality GPIO64-GPIO79
    GpioCtrlRegs.GPCMUX2.all = 0x0000; // GPIO functionality GPIO80-GPIO95

GpioCtrlRegs.GPADIR.all = 0x0000; // GPIO0-GPIO31 are inputs
    GpioCtrlRegs.GPBDIR.all = 0x0000; // GPIO32-GPIO63 are inputs
    GpioCtrlRegs.GPCDIR.all = 0x0000; // GPI064-GPIO95 are inputs

//
    // Each input can have different qualification
    // a) input synchronized to SYSCLKOUT
    // b) input qualified by a sampling window
    // c) input sent asynchronously (valid for peripheral inputs only)
    //
    GpioCtrlRegs.GPAQSEL1.all = 0x0000; // GPIO0-GPIO15 Synch to SYSCLKOUT
    GpioCtrlRegs.GPAQSEL2.all = 0x0000; // GPIO16-GPIO31 Synch to SYSCLKOUT
    GpioCtrlRegs.GPBQSEL1.all = 0x0000; // GPIO32-GPIO39 Synch to SYSCLKOUT
    GpioCtrlRegs.GPBQSEL2.all = 0x0000; // GPIO48-GPIO63 Synch to SYSCLKOUT

//
    // Pull-ups can be enabled or disabled
    //
    GpioCtrlRegs.GPAPUD.all = 0x0000; // Pullup's enabled GPIO0-GPIO31
    GpioCtrlRegs.GPBPUD.all = 0x0000; // Pullup's enabled GPIO32-GPIO63
    GpioCtrlRegs.GPCPUD.all = 0x0000; // Pullup's enabled GPIO64-GPIO79
    // GpioCtrlRegs.GPAPUD.all = 0xFFFF;    // Pullup's disabled GPIO0-GPIO31
    // GpioCtrlRegs.GPBPUD.all = 0xFFFF;    // Pullup's disabled GPIO32-GPIO34
    // GpioCtrlRegs.GPCPUD.all = 0xFFFF;    // Pullup's disabled GPIO64-GPIO79

EDIS;
}

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void InitGpio(void)
{
    EALLOW;

    //
    // Each GPIO pin can be:
    // a) a GPIO input/output
    // b) peripheral function 1
    // c) peripheral function 2
    // d) peripheral function 3
    // By default, all are GPIO Inputs
    //
    GpioCtrlRegs.GPAMUX1.all = 0x0000; // GPIO functionality GPIO0-GPIO15
    GpioCtrlRegs.GPAMUX2.all = 0x0000; // GPIO functionality GPIO16-GPIO31
    GpioCtrlRegs.GPBMUX1.all = 0x0000; // GPIO functionality GPIO32-GPIO39
    GpioCtrlRegs.GPBMUX2.all = 0x0000; // GPIO functionality GPIO48-GPIO63
    GpioCtrlRegs.GPCMUX1.all = 0x0000; // GPIO functionality GPIO64-GPIO79
    GpioCtrlRegs.GPCMUX2.all = 0x0000; // GPIO functionality GPIO80-GPIO95

    GpioCtrlRegs.GPADIR.all = 0x0000; // GPIO0-GPIO31 are inputs
    GpioCtrlRegs.GPBDIR.all = 0x0000; // GPIO32-GPIO63 are inputs
    GpioCtrlRegs.GPCDIR.all = 0x0000; // GPI064-GPIO95 are inputs

    //
    // Each input can have different qualification
    // a) input synchronized to SYSCLKOUT
    // b) input qualified by a sampling window
    // c) input sent asynchronously (valid for peripheral inputs only)
    //
    GpioCtrlRegs.GPAQSEL1.all = 0x0000; // GPIO0-GPIO15 Synch to SYSCLKOUT
    GpioCtrlRegs.GPAQSEL2.all = 0x0000; // GPIO16-GPIO31 Synch to SYSCLKOUT
    GpioCtrlRegs.GPBQSEL1.all = 0x0000; // GPIO32-GPIO39 Synch to SYSCLKOUT
    GpioCtrlRegs.GPBQSEL2.all = 0x0000; // GPIO48-GPIO63 Synch to SYSCLKOUT

    //
    // Pull-ups can be enabled or disabled
    //
    GpioCtrlRegs.GPAPUD.all = 0x0000; // Pullup's enabled GPIO0-GPIO31
    GpioCtrlRegs.GPBPUD.all = 0x0000; // Pullup's enabled GPIO32-GPIO63
    GpioCtrlRegs.GPCPUD.all = 0x0000; // Pullup's enabled GPIO64-GPIO79
    // GpioCtrlRegs.GPAPUD.all = 0xFFFF;    // Pullup's disabled GPIO0-GPIO31
    // GpioCtrlRegs.GPBPUD.all = 0xFFFF;    // Pullup's disabled GPIO32-GPIO34
    // GpioCtrlRegs.GPCPUD.all = 0xFFFF;    // Pullup's disabled GPIO64-GPIO79

    EDIS;
}

3 清除所有中断和初始化 PIE 向量表

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    DINT;          // 禁用CPU中断
    InitPieCtrl(); // 初始化 PIE 控制寄存器到默认状态，默认状态是全部 PIE 中断被禁用和标志位被清除
    IER = 0x0000;  // 禁用 CPU 中断和清除所有 CPU 中断标志位:
    IFR = 0x0000;
    InitPieVectTable(); // 初始化 PIE 中断向量表

4 添加用户具体代码

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    LED_GPIO_Config(); // LED端口初始化

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void LED_GPIO_Config(void)
{
    EALLOW;
    GpioCtrlRegs.GPAMUX1.bit.GPIO0=0;//普通IO模式
    GpioCtrlRegs.GPAPUD.bit.GPIO0=0;//使能内部上拉
    GpioCtrlRegs.GPADIR.bit.GPIO0=1;//配置成输出

    GpioCtrlRegs.GPAMUX1.bit.GPIO1=0;//普通IO模式
    GpioCtrlRegs.GPAPUD.bit.GPIO1=0;//使能内部上拉
    GpioCtrlRegs.GPADIR.bit.GPIO1=1;//配置成输出

    GpioCtrlRegs.GPAMUX1.bit.GPIO2=0;//普通IO模式
    GpioCtrlRegs.GPAPUD.bit.GPIO2=0;//使能内部上拉
    GpioCtrlRegs.GPADIR.bit.GPIO2=1;//配置成输出

    GpioCtrlRegs.GPAMUX1.bit.GPIO3=0;//普通IO模式
    GpioCtrlRegs.GPAPUD.bit.GPIO3=0;//使能内部上拉
    GpioCtrlRegs.GPADIR.bit.GPIO3=1;//配置成输出

    GpioCtrlRegs.GPAMUX1.bit.GPIO4=0;//普通IO模式
    GpioCtrlRegs.GPAPUD.bit.GPIO4=0;//使能内部上拉
    GpioCtrlRegs.GPADIR.bit.GPIO4=1;//配置成输出

    GpioDataRegs. GPASET.bit.GPIO0=1; //输出高电平
    GpioDataRegs. GPASET.bit.GPIO1=1; //输出高电平
    GpioDataRegs. GPASET.bit.GPIO2=1;
    GpioDataRegs. GPASET.bit.GPIO3=1;
    GpioDataRegs. GPASET.bit.GPIO4=1;
    EDIS;
}

输出高电平

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GpioDataRegs. GPASET.bit.GPIO0 = 1; //输出高电平

输出低电平

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GpioCtrlRegs.GPACLEAR.bit.GPIO0 = 1;

5 编写主循环

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    while(1)
    {
        for ( i = 0; i < 5; i++)
        {
            GpioDataRegs.GPACLEAR.all = (0x01 << i);
            delay_1ms(1000);
            GpioDataRegs.GPASET.all = (0x01 << i);
            delay_1ms(1000);
        }
    }