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F28335 的外设中断源
远远不止 12 个，共用 58 个。那么如何将这 58 个外设中断源分配给这 12 个中断线呢，
这就需要 F28335 的 PIE 外设中断扩展模块来完成。
PIE 级中断表。。。。。非常有用
每一组 ePWM 模块
GPIO输出配置LED
void LED_Init(void)
{
EALLOW;
SysCtrlRegs.PCLKCR3.bit.GPIOINENCLK = 1;// 开启GPIO时钟
//LED1端口配置
GpioCtrlRegs.GPCMUX1.bit.GPIO68=0;//设置为通用GPIO功能
GpioCtrlRegs.GPCDIR.bit.GPIO68=1;//设置GPIO方向为输出
GpioCtrlRegs.GPCPUD.bit.GPIO68=0;//使能GPIO上拉电阻
//LED2端口配置
GpioCtrlRegs.GPCMUX1.bit.GPIO67=0;
GpioCtrlRegs.GPCDIR.bit.GPIO67=1;
GpioCtrlRegs.GPCPUD.bit.GPIO67=0;
//LED3端口配置
GpioCtrlRegs.GPCMUX1.bit.GPIO66=0;
GpioCtrlRegs.GPCDIR.bit.GPIO66=1;
GpioCtrlRegs.GPCPUD.bit.GPIO66=0;
//LED4端口配置
GpioCtrlRegs.GPCMUX1.bit.GPIO65=0;
GpioCtrlRegs.GPCDIR.bit.GPIO65=1;
GpioCtrlRegs.GPCPUD.bit.GPIO65=0;
//LED5端口配置
GpioCtrlRegs.GPCMUX1.bit.GPIO64=0;
GpioCtrlRegs.GPCDIR.bit.GPIO64=1;
GpioCtrlRegs.GPCPUD.bit.GPIO64=0;
//LED6端口配置
GpioCtrlRegs.GPAMUX1.bit.GPIO10=0;
GpioCtrlRegs.GPADIR.bit.GPIO10=1;
GpioCtrlRegs.GPAPUD.bit.GPIO10=0;
//LED7端口配置
GpioCtrlRegs.GPAMUX1.bit.GPIO11=0;
GpioCtrlRegs.GPADIR.bit.GPIO11=1;
GpioCtrlRegs.GPAPUD.bit.GPIO11=0;
GpioDataRegs.GPCSET.bit.GPIO68=1;
GpioDataRegs.GPCSET.bit.GPIO67=1;
GpioDataRegs.GPCSET.bit.GPIO66=1;
GpioDataRegs.GPCSET.bit.GPIO65=1;
GpioDataRegs.GPCSET.bit.GPIO64=1;
GpioDataRegs.GPASET.bit.GPIO10=1;
GpioDataRegs.GPASET.bit.GPIO11=1;
EDIS;
}
GPIO输入配置KEY
void KEY_Init(void)
{
EALLOW;
SysCtrlRegs.PCLKCR3.bit.GPIOINENCLK = 1;// 开启GPIO时钟
//KEY端口配置
GpioCtrlRegs.GPAMUX1.bit.GPIO12=0;
GpioCtrlRegs.GPADIR.bit.GPIO12=0;
GpioCtrlRegs.GPAPUD.bit.GPIO12=0;
GpioCtrlRegs.GPAMUX1.bit.GPIO13=0;
GpioCtrlRegs.GPADIR.bit.GPIO13=0;
GpioCtrlRegs.GPAPUD.bit.GPIO13=0;
GpioCtrlRegs.GPAMUX1.bit.GPIO14=0;
GpioCtrlRegs.GPADIR.bit.GPIO14=0;
GpioCtrlRegs.GPAPUD.bit.GPIO14=0;
GpioCtrlRegs.GPBMUX2.bit.GPIO48=0;
GpioCtrlRegs.GPBDIR.bit.GPIO48=1;
GpioCtrlRegs.GPBPUD.bit.GPIO48=0;
GpioCtrlRegs.GPBMUX2.bit.GPIO49=0;
GpioCtrlRegs.GPBDIR.bit.GPIO49=1;
GpioCtrlRegs.GPBPUD.bit.GPIO49=0;
GpioCtrlRegs.GPBMUX2.bit.GPIO50=0;
GpioCtrlRegs.GPBDIR.bit.GPIO50=1;
GpioCtrlRegs.GPBPUD.bit.GPIO50=0;
EDIS;
GpioDataRegs.GPBSET.bit.GPIO48=1;
GpioDataRegs.GPBSET.bit.GPIO49=1;
GpioDataRegs.GPBSET.bit.GPIO50=1;
}
char KEY_Scan(char mode)
{
static char keyl1=1;
static char keyl2=1;
static char keyl3=1;
//第1列扫描
KEY_L1_SetL;
KEY_L2_SetH;
KEY_L3_SetH;
if(keyl1==1&&(KEY_H1==0||KEY_H2==0||KEY_H3==0))
{
DELAY_US(10000);
keyl1=0;
if(KEY_H1==0)
{
return KEY1_PRESS;
}
else if(KEY_H2==0)
{
return KEY4_PRESS;
}
else if(KEY_H3==0)
{
return KEY7_PRESS;
}
}
else if(KEY_H1==1&&KEY_H2==1&&KEY_H3==1)
{
keyl1=1;
}
if(mode)
keyl1=1;
//第2列扫描
KEY_L2_SetL;
KEY_L1_SetH;
KEY_L3_SetH;
if(keyl2==1&&(KEY_H1==0||KEY_H2==0||KEY_H3==0))
{
DELAY_US(10000);
keyl2=0;
if(KEY_H1==0)
{
return KEY2_PRESS;
}
else if(KEY_H2==0)
{
return KEY5_PRESS;
}
else if(KEY_H3==0)
{
return KEY8_PRESS;
}
}
else if(KEY_H1==1&&KEY_H2==1&&KEY_H3==1)
{
keyl2=1;
}
if(mode)
keyl2=1;
//第3列扫描
KEY_L3_SetL;
KEY_L1_SetH;
KEY_L2_SetH;
if(keyl3==1&&(KEY_H1==0||KEY_H2==0||KEY_H3==0))
{
DELAY_US(10000);
keyl3=0;
if(KEY_H1==0)
{
return KEY3_PRESS;
}
else if(KEY_H2==0)
{
return KEY6_PRESS;
}
else if(KEY_H3==0)
{
return KEY9_PRESS;
}
}
else if(KEY_H1==1&&KEY_H2==1&&KEY_H3==1)
{
keyl3=1;
}
if(mode)
keyl3=1;
return KEY_UNPRESS;
}
外设中断PIE配置
interrupt void EXTI1_IRQn(void)；
void EXTI1_Init(void)
{
EALLOW;
SysCtrlRegs.PCLKCR3.bit.GPIOINENCLK = 1; // GPIO input clock
EDIS;
EALLOW;
//KEY端口配置
GpioCtrlRegs.GPAMUX1.bit.GPIO12=0;
GpioCtrlRegs.GPADIR.bit.GPIO12=0;
GpioCtrlRegs.GPAPUD.bit.GPIO12=0;
GpioCtrlRegs.GPAQSEL1.bit.GPIO12 = 0; // 外部中断1（XINT1）与系统时钟SYSCLKOUT同步
GpioCtrlRegs.GPBMUX2.bit.GPIO48=0;
GpioCtrlRegs.GPBDIR.bit.GPIO48=1;
GpioCtrlRegs.GPBPUD.bit.GPIO48=0;
GpioDataRegs.GPBCLEAR.bit.GPIO48=1;//L
EDIS;
EALLOW;
GpioIntRegs.GPIOXINT1SEL.bit.GPIOSEL = 12; // XINT1是GPIO12
EDIS;
EALLOW; // 修改被保护的寄存器，修改前应添加EALLOW语句
PieVectTable.XINT1 = &EXTI1_IRQn;
EDIS; // EDIS的意思是不允许修改被保护的寄存器
PieCtrlRegs.PIEIER1.bit.INTx4 = 1; // 使能PIE组1的INT4
XIntruptRegs.XINT1CR.bit.POLARITY = 0; // 下降沿触发中断
XIntruptRegs.XINT1CR.bit.ENABLE= 1; // 使能XINT1
IER |= M_INT1; // 使能CPU中断1（INT1）
EINT; // 开全局中断
ERTM;
}
interrupt void EXTI1_IRQn(void)
{
Uint32 i;
for(i=0;i<10000;i++); //键盘消抖动
while(!KEY_H1);
LED2_TOGGLE;
PieCtrlRegs.PIEACK.bit.ACK1=1;
}
定时器0配置，1与2类比即可
interrupt void TIM0_IRQn(void)；
//定时器0初始化函数
//Freq：CPU时钟频率（150MHz）
//Period：定时周期值，单位us
void TIM0_Init(float Freq, float Period)
{
EALLOW;
SysCtrlRegs.PCLKCR3.bit.CPUTIMER0ENCLK = 1; // CPU Timer 0
EDIS;
//设置定时器0的中断入口地址为中断向量表的INT0
EALLOW;
PieVectTable.TINT0 = &TIM0_IRQn;
EDIS;
//指向定时器0的寄存器地址
CpuTimer0.RegsAddr = &CpuTimer0Regs;
//设置定时器0的周期寄存器值
CpuTimer0Regs.PRD.all = 0xFFFFFFFF;
//设置定时器预定标计数器值为0
CpuTimer0Regs.TPR.all = 0;
CpuTimer0Regs.TPRH.all = 0;
//确保定时器0为停止状态
CpuTimer0Regs.TCR.bit.TSS = 1;
//重载使能
CpuTimer0Regs.TCR.bit.TRB = 1;
// Reset interrupt counters:
CpuTimer0.InterruptCount = 0;
ConfigCpuTimer(&CpuTimer0, Freq, Period);
//开始定时器功能
CpuTimer0Regs.TCR.bit.TSS=0;
//开启CPU第一组中断并使能第一组中断的第7个小中断，即定时器0
IER |= M_INT1;
PieCtrlRegs.PIEIER1.bit.INTx7 = 1;
//使能总中断
EINT;
ERTM;
}
interrupt void TIM0_IRQn(void)
{
EALLOW;
LED2_TOGGLE;
PieCtrlRegs.PIEACK.bit.ACK1=1;
EDIS;
}
EPWM配置，外加PIE中断
interrupt void epwm1_timer_isr(void);
void EPWM1_Init(Uint16 tbprd)
{
EALLOW;
SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1; // Disable TBCLK within the ePWM
SysCtrlRegs.PCLKCR1.bit.EPWM1ENCLK = 1; // ePWM1
EDIS;
// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
EALLOW; // This is needed to write to EALLOW protected registers
PieVectTable.EPWM1_INT = &epwm1_timer_isr;
EDIS; // This is needed to disable write to EALLOW protected registers
EALLOW;
SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0; // Stop all the TB clocks
EDIS;
// Setup Sync
EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; // Pass through
// Allow each timer to be sync'ed
EPwm1Regs.TBCTL.bit.PHSEN = TB_ENABLE;
EPwm1Regs.TBPHS.half.TBPHS = 0;
EPwm1Regs.TBPRD = tbprd;
EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; // Count up
EPwm1Regs.TBCTL.bit.HSPCLKDIV=TB_DIV1;
EPwm1Regs.TBCTL.bit.CLKDIV=TB_DIV1;
EPwm1Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO; // Select INT on Zero event
EPwm1Regs.ETSEL.bit.INTEN = 1; // Enable INT
EPwm1Regs.ETPS.bit.INTPRD = ET_1ST; // Generate INT on 1st event
EALLOW;
SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1; // Start all the timers synced
EDIS;
// Enable CPU INT3 which is connected to EPWM1-6 INT:
IER |= M_INT3;
// Enable EPWM INTn in the PIE: Group 3 interrupt 1-6
PieCtrlRegs.PIEIER3.bit.INTx1 = 1;
// Enable global Interrupts and higher priority real-time debug events:
EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM
}
interrupt void epwm1_timer_isr(void)
{
static Uint16 cnt=0;
cnt++;
if(cnt==5000)
{
cnt=0;
LED3_TOGGLE;
}
// Clear INT flag for this timer
EPwm1Regs.ETCLR.bit.INT = 1;
// Acknowledge this interrupt to receive more interrupts from group 3
PieCtrlRegs.PIEACK.bit.ACK3 = 1;
}
ADC单路配置
void ADC_Init(void)
{
// Specific clock setting for this example:
EALLOW;
SysCtrlRegs.PCLKCR0.bit.ADCENCLK = 1; // ADC
EDIS;
// Specific clock setting for this example:
EALLOW;
SysCtrlRegs.HISPCP.all = ADC_MODCLK; // HSPCLK = SYSCLKOUT/(2*ADC_MODCLK)
EDIS;
InitAdc(); // For this example, init the ADC
// Specific ADC setup for this example:
AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK;
AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS;
AdcRegs.ADCTRL1.bit.SEQ_CASC = 1; // 1 Cascaded mode
AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x0;
AdcRegs.ADCTRL1.bit.CONT_RUN = 1; // Setup continuous run
AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0x0;
// Start SEQ1
AdcRegs.ADCTRL2.all = 0x2000;
}
Uint16 Read_ADCValue(void)
{
while (AdcRegs.ADCST.bit.INT_SEQ1== 0);
AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1;
return AdcRegs.ADCRESULT0>>4;
}