Tms320F28335中ＰＷＭ触发ADC１６路级联顺序采样

/************* 2021.12.20 *******************
-------- 主要功能： 16路ADC顺序采样 ---------
1. 定时中断0，驱动48口LED闪烁，低电平有效；
2. 在IO2和IO4口上产生125Hz，占空比为50%的方波;
3. 将IO2与ADC1口连接，IO4与ADC2口连接，脉搏传感器的s端与ADC0连接，-端与33脚连接，+与3V3连接;
4. A0口采集脉搏信号，A1和A2口分别采集不同频率的方波;
5. 采用1500Hz频率进行采样,将产生的方波连接到不同的端子上，即可采集不同的信号。
************* end *******************/

#include "DSP2833x_Device.h" // DSP2833x Headerfile Include File
#include "DSP2833x_Examples.h" // DSP2833x Examples Include File

interrupt void AdcIsr(void); //ADC中断服务子函数声明
interrupt void cpu_timer0_isr(void); //定时器0中断服务子函数声明
void InitMyGpio(); //GPIO48口初始化函数声明,LED闪烁
void InitEPWM(); //EPWM2初始化函数声明
void InitMyAdc(void); //ADC初始化函数声明
#define startCpuTimer0() CpuTimer0Regs.TCR.bit.TSS=0 //定时器0启动指令宏定义
#define BUF_SIZE 256 // 信号缓存区长度
#define TimerPeriod 1000 //定时器1000us=1ms
// ADC时钟初始参数设置,对SYSCLKOUT分频后形成HSPCLK，用于ADC
#if (CPU_FRQ_150MHZ) // Default - 150 MHz SYSCLKOUT
#define ADC_MODCLK 0x0 // 当ADC_MODCLK2=3，HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 150/(2*3) = 25.0 MHz
// 当ADC_MODCLK2=0，HSPCLK = SYSCLKOUT
#endif
#if (CPU_FRQ_100MHZ)
#define ADC_MODCLK 0x0 // 当ADC_MODCLK2=2， HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 100/(2*2) = 25.0 MHz
#endif
#define ADC_SHCLK 0x1 // S/H width in ADC module periods

float SampleTable0[BUF_SIZE];
float SampleTable1[BUF_SIZE];
float SampleTable2[BUF_SIZE];
float SampleTable3[BUF_SIZE];
float SampleTable4[BUF_SIZE];
float SampleTable5[BUF_SIZE];
float SampleTable6[BUF_SIZE];
float SampleTable7[BUF_SIZE];

float SampleTable8[BUF_SIZE];
float SampleTable9[BUF_SIZE];
float SampleTable10[BUF_SIZE];
float SampleTable11[BUF_SIZE];
float SampleTable12[BUF_SIZE];
float SampleTable13[BUF_SIZE];
float SampleTable14[BUF_SIZE];
float SampleTable15[BUF_SIZE];

Uint16 SampleDone=0;
void main(void)

{
Uint16 i;
//-----1.系统和中断向量表初始化
InitSysCtrl();
DINT;
InitPieCtrl();
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable();
//-----2.中断服务地址重新映射
//2.1 中断映射
EALLOW;
PieVectTable.TINT0 = &cpu_timer0_isr;//定时器0中断映射
PieVectTable.ADCINT = &AdcIsr;//ADC中断映射
//PieVectTable.XINT13 = &cpu_timer1_isr;
//PieVectTable.TINT2 = &cpu_timer2_isr;
EDIS;

//-----3.在PIE级和CPU级，开全局中断
PieCtrlRegs.PIEIER1.bit.INTx6 = 1;//使能ADC中断(INT1.6)
PieCtrlRegs.PIEIER1.bit.INTx7 = 1;//定时器0中断（INT1.6）
IER |= M_INT1;
EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM
//------4.ADC初始化
//4.1.ADC初始时钟设置
EALLOW;
SysCtrlRegs.HISPCP.all = ADC_MODCLK; // HSPCLK = SYSCLKOUT/（2*ADC_MODCLK） ;复位默认，HSPCLK=SysCLKOUT/2
EDIS;
//4.2使能AD时钟、完成AD校准及上电，该程序可见TI例程DSP2833x_Adc.c文件
InitAdc();
//4.3 详细配置ADC
InitMyAdc();
//------5.GPIO初始化
InitMyGpio(); //配置GPIO48为IOs输出功能，GPIO2为PWM模式
//------6.定时器初始化及启动
//6.1 定时器初始化
InitCpuTimers(); // For this example, only initialize the Cpu Timers
//6.2 定时器定时周期初始化
#if (CPU_FRQ_150MHZ)
// Configure CPU-Timer 0, 1, and 2 to interrupt every 1000 usecond:
// 150MHz CPU Freq, 1 second Period (in uSeconds)
ConfigCpuTimer(&CpuTimer0, 150, TimerPeriod);
//ConfigCpuTimer(&CpuTimer1, 150, 1000000);
//ConfigCpuTimer(&CpuTimer2, 150, 1000000);
#endif
#if (CPU_FRQ_100MHZ)
// Configure CPU-Timer 0, 1, and 2 to interrupt every 100 usecond:
// 100MHz CPU Freq, 1 second Period (in uSeconds)
ConfigCpuTimer(&CpuTimer0, 100, TimerPeriod)
//ConfigCpuTimer(&CpuTimer1, 100, 1000000);
//ConfigCpuTimer(&CpuTimer2, 100, 1000000);
#endif

//6.3 启动定时器
startCpuTimer0();
//------7.初始化PWM2模块
InitEPWM(); //配置ePWM2模块
//------8.清空缓存区
for (i=0; i<BUF_SIZE; i++)
{
SampleTable0[i] = 0;
SampleTable1[i] = 0;
SampleTable2[i] = 0;
SampleTable3[i] = 0;
SampleTable4[i] = 0;
SampleTable5[i] = 0;
SampleTable6[i] = 0;
SampleTable7[i] = 0;
SampleTable8[i] = 0;
SampleTable9[i] = 0;
SampleTable10[i] = 0;
SampleTable11[i] = 0;
SampleTable12[i] = 0;
SampleTable13[i] = 0;
SampleTable14[i] = 0;
SampleTable15[i] = 0;
}
while(1)
{
if (SampleDone==1)
{ for ( i=0; i<BUF_SIZE-1; i++)
{
SampleTable0[i] = SampleTable0[i+1];
SampleTable1[i] = SampleTable1[i+1];
SampleTable2[i] = SampleTable2[i+1];
SampleTable3[i] = SampleTable3[i+1];
SampleTable4[i] = SampleTable4[i+1];
SampleTable5[i] = SampleTable5[i+1];
SampleTable6[i] = SampleTable6[i+1];
SampleTable7[i] = SampleTable7[i+1];
SampleTable8[i] = SampleTable8[i+1];
SampleTable9[i] = SampleTable9[i+1];
SampleTable10[i] = SampleTable10[i+1];
SampleTable11[i] = SampleTable11[i+1];
SampleTable12[i] = SampleTable12[i+1];
SampleTable13[i] = SampleTable13[i+1];
SampleTable14[i] = SampleTable14[i+1];
SampleTable15[i] = SampleTable15[i+1];
}
SampleDone=0;
}
}
}

interrupt void cpu_timer0_isr(void)
{
CpuTimer0.InterruptCount++; //中断计数器，用于计算中断的响应次数
if(CpuTimer0.InterruptCount==500) //每个1sLED闪烁一次
{
GpioDataRegs.GPBTOGGLE.bit.GPIO48 = 1;
CpuTimer0.InterruptCount=0;
}
// Acknowledge this interrupt to receive more interrupts from group 1
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
CpuTimer0Regs.TCR.bit.TIF=1;//清除中断标志位
CpuTimer0Regs.TCR.bit.TRB=1;//重新装载初值
}

void InitMyGpio()
{
EALLOW;
// 配置GPIO48为普通IO口输出功能
GpioCtrlRegs.GPBMUX2.all=0x00000000; //功能选择寄存器普通IO使用,GPIO48属于GPBMUX2
GpioCtrlRegs.GPBDIR.all=0xFFFFFFFF; //设置为输出模式

//配置GPIO2为EPWM2a功能
GpioCtrlRegs.GPAPUD.bit.GPIO2 = 0; //使能上拉
GpioCtrlRegs.GPAMUX1.bit.GPIO2 = 1; //作为EPWM2a功能
//配置GPIO4为EPWM3a功能
GpioCtrlRegs.GPAPUD.bit.GPIO4 = 0; //使能上拉
GpioCtrlRegs.GPAMUX1.bit.GPIO4 = 1; //作为EPWM3a功能

EDIS;
}

void InitEPWM()
{
EPwm2Regs.TBCTL.bit.CTRMODE = 0; //连续增计数模式
EPwm2Regs.TBCTL.bit.HSPCLKDIV = 3; //配置高速时钟/6分频；=2*k,k=1-7,k=0时1分频
EPwm2Regs.TBCTL.bit.CLKDIV = 2; //对输入时钟/4分频，2的k次方,k=0-7
EPwm2Regs.AQCTLA.bit.ZRO = 2; //计数值为0时，EPWM2a输出高电平
EPwm2Regs.AQCTLA.bit.CAU = 1; //计数值为比较值时，EPWM2a输出低电平
EPwm2Regs.TBPRD = 49999; //配置周期值，信号频率为150M / (6*4)/ (TBPRD+1) = 1250Hz
EPwm2Regs.CMPA.half.CMPA = (EPwm2Regs.TBPRD+1)/2;//配置比较值

EPwm3Regs.TBCTL.bit.CTRMODE = 0; //连续增计数模式
EPwm3Regs.TBCTL.bit.HSPCLKDIV = 3; //配置高速时钟/6分频
EPwm3Regs.TBCTL.bit.CLKDIV = 2; //对输入时钟/4分频
EPwm3Regs.AQCTLA.bit.ZRO = 2; //计数值为0时，EPWM3a输出高电平
EPwm3Regs.AQCTLA.bit.CAU = 1; //计数值为比较值时，EPWM3a输出低电平
EPwm3Regs.TBPRD = 49999; //配置周期值，信号频率为150M / (6*4)/ (TBPRD+1) = 1250Hz
EPwm3Regs.CMPA.half.CMPA= (EPwm2Regs.TBPRD+1)/2;//配置比较值
}

void InitMyAdc(void)
{
AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK; // Sequential mode: Sample rate = 1/[(2+ACQ_PS)*ADC clock in ns]
// = 1/(3*6.67ns) =49.97MHz (for 150 MHz SYSCLKOUT)
// = 1/(3*10ns) =33.33MHz (for 100 MHz SYSCLKOUT)
// If Simultaneous mode enabled: Sample rate = 1/[(3+ACQ_PS)*ADC clock in ns]
AdcRegs.ADCTRL1.bit.CPS = 1; //内核时钟/2分频=75MHz
AdcRegs.ADCTRL3.bit.ADCCLKPS = 1; //AdcClk =75MHz/(2*(1+1))=18.75Mhz
AdcRegs.ADCTRL3.bit.SMODE_SEL= 0; //设置为顺序采样
AdcRegs.ADCTRL1.bit.CONT_RUN= 0; //设置为非连续运行方式
AdcRegs.ADCTRL1.bit.SEQ_CASC = 1; //设置为级联工作方式
AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 15; //设置最大通道数
AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x0; //SEQ1对应CONV00-03
AdcRegs.ADCCHSELSEQ1.bit.CONV01 = 0x1;
AdcRegs.ADCCHSELSEQ1.bit.CONV02 = 0x2;
AdcRegs.ADCCHSELSEQ1.bit.CONV03 = 0x3;
AdcRegs.ADCCHSELSEQ2.bit.CONV04 = 0x4; //SEQ2对应CONV04-07
AdcRegs.ADCCHSELSEQ2.bit.CONV05 = 0x5;
AdcRegs.ADCCHSELSEQ2.bit.CONV06 = 0x6;
AdcRegs.ADCCHSELSEQ2.bit.CONV07 = 0x7;
AdcRegs.ADCCHSELSEQ3.bit.CONV08 = 0x8; //SEQ3对应CONV08-11
AdcRegs.ADCCHSELSEQ3.bit.CONV09 = 0x9;
AdcRegs.ADCCHSELSEQ3.bit.CONV10 = 0xA;
AdcRegs.ADCCHSELSEQ3.bit.CONV11 = 0xB;
AdcRegs.ADCCHSELSEQ4.bit.CONV12 = 0xC; //SEQ4对应CONV012-15
AdcRegs.ADCCHSELSEQ4.bit.CONV13 = 0xD;
AdcRegs.ADCCHSELSEQ4.bit.CONV14 = 0xE;
AdcRegs.ADCCHSELSEQ4.bit.CONV15 = 0xF;

AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 0x1; //打开SEQ1中断
AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1 = 0x1; //使能 PWMA SOC触发

// 配置ePWM1触发ADC
EPwm1Regs.ETSEL.bit.SOCAEN = 1; // 使能ePWMa触发AD转换
EPwm1Regs.ETSEL.bit.SOCASEL = 4; // 选择当计数值递增至CMPA作为触发事件
EPwm1Regs.ETPS.bit.SOCAPRD = 1; // 在第一个触发事件后即产生触发脉冲
EPwm1Regs.TBCTL.bit.CTRMODE = 0; // 增计数模式
EPwm1Regs.TBCTL.bit.HSPCLKDIV = 1; //HSPCLKDIV选择2分频
EPwm1Regs.TBCTL.bit.CLKDIV = 0; //CLKDIV选择不分频
EPwm1Regs.TBPRD = 49999; //设置周期值，采样频率为150M / (1*2)/ (TBPRD+1) = 1500Hz
EPwm1Regs.CMPA.half.CMPA = EPwm1Regs.TBPRD /2; // 设置比较值
}
interrupt void AdcIsr(void)
{
SampleDone=1;
SampleTable0[BUF_SIZE-1] = 3.0*(AdcRegs.ADCRESULT0 >>4)/4095;
SampleTable1[BUF_SIZE-1] = 3.0*(AdcRegs.ADCRESULT1 >>4)/4095;
SampleTable2[BUF_SIZE-1] = 3.0*(AdcRegs.ADCRESULT2 >>4)/4095;
SampleTable3[BUF_SIZE-1] = 3.0*(AdcRegs.ADCRESULT3 >>4)/4095;
SampleTable4[BUF_SIZE-1] = 3.0*(AdcRegs.ADCRESULT4 >>4)/4095;
SampleTable5[BUF_SIZE-1] = 3.0*(AdcRegs.ADCRESULT5 >>4)/4095;
SampleTable6[BUF_SIZE-1] = 3.0*(AdcRegs.ADCRESULT6 >>4)/4095;
SampleTable7[BUF_SIZE-1] = 3.0*(AdcRegs.ADCRESULT7 >>4)/4095;

SampleTable8[BUF_SIZE-1] = 3.0*(AdcRegs.ADCRESULT8 >>4)/4095;
SampleTable9[BUF_SIZE-1] = 3.0*(AdcRegs.ADCRESULT9 >>4)/4095;
SampleTable10[BUF_SIZE-1] = 3.0*(AdcRegs.ADCRESULT10 >>4)/4095;
SampleTable11[BUF_SIZE-1] = 3.0*(AdcRegs.ADCRESULT11 >>4)/4095;
SampleTable12[BUF_SIZE-1] = 3.0*(AdcRegs.ADCRESULT12 >>4)/4095;
SampleTable13[BUF_SIZE-1] = 3.0*(AdcRegs.ADCRESULT13 >>4)/4095;
SampleTable14[BUF_SIZE-1] = 3.0*(AdcRegs.ADCRESULT14 >>4)/4095;
SampleTable15[BUF_SIZE-1] = 3.0*(AdcRegs.ADCRESULT15 >>4)/4095;

AdcRegs.ADCTRL2.bit.RST_SEQ1 = 1; // 复位排序器至CONV00
AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1; // 清除SEQ1中断标志位
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1; // 应答PIE分组中断
}

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