本帖最后由 xy清如许 于 2020-6-22 19:21 编辑
代码这里#include "DSP2833x_Device.h" // DSP2833x Headerfile Include File
#include "DSP2833x_Examples.h" // DSP2833x Examples Include File
#define BUF_SIZE 128 // Sample buffer size
#pragma DATA_SECTION(DMABuf1,"DMARAML4");
#pragma DATA_SECTION(DMABuf2,"ZONE7DATA");
volatile Uint16 DMABuf1[BUF_SIZE];
volatile Uint16 DMABuf2[BUF_SIZE];
Uint16 i;
volatile Uint16 *DMADest;
volatile Uint16 *DMASource;
interrupt void xint1_isr(void);
interrupt void xint2_isr(void);
void init_zone7(void);
main(void)
{
// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP2833x_SysCtrl.c file.
InitSysCtrl();
// Step 2. Initialize GPIO:
// This example function is found in the DSP2833x_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
// InitGpio(); // Skipped for this example
// Step 3. Clear all interrupts and initialize PIE vector table:
// Disable CPU interrupts
DINT;
// Initialize the PIE control registers to their default state.
// The default state is all PIE interrupts disabled and flags
// are cleared.
// This function is found in the DSP2833x_PieCtrl.c file.
InitPieCtrl();
// Disable CPU interrupts and clear all CPU interrupt flags:
IER = 0x0000;
IFR = 0x0000;
// Initialize the PIE vector table with pointers to the shell Interrupt
// Service Routines (ISR).
// This will populate the entire table, even if the interrupt
// is not used in this example. This is useful for debug purposes.
// The shell ISR routines are found in DSP2833x_DefaultIsr.c.
// This function is found in DSP2833x_PieVect.c.
InitPieVectTable();
// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
EALLOW; // Allow access to EALLOW protected registers
PieVectTable.XINT1= &xint1_isr;
PieVectTable.XINT2= &xint2_isr;
EDIS; // Disable access to EALLOW protected registers
IER |= M_INT1; //Enable INT1 (1.4 DMA Ch1)
EnableInterrupts();
PieCtrlRegs.PIEIER1.bit.INTx4 = 1; // 使能PIE组1的INT4
PieCtrlRegs.PIEIER1.bit.INTx5 = 1; // 使能PIE组1的INT5
//Step 5. User specific code, enable interrupts:
// Initialize DMA
DMAInitialize();
init_zone7();
// Initialize Tables
for (i=0; i<BUF_SIZE; i++)
{
DMABuf1 = 0;
DMABuf2 = 0;
}
// Configure DMA Channel
DMADest = &DMABuf1[0];
DMASource = &DMABuf2[0];
DMACH1AddrConfig(DMADest,DMASource);
DMACH1BurstConfig(15,1,1); //Will set up to use 16-bit datasize, pointers are based on 16-bit words
DMACH1TransferConfig(15,1,1); //so need to increment by 1 to grab the correct location
DMACH1WrapConfig(0xFFFF,0,0xFFFF,0);
//Use timer0 to start the x-fer.
//Since this is a static copy use one shot mode, so only one trigger is needed
//Also using 16-bit mode to decrease x-fer time
DMACH1ModeConfig(DMA_XINT1,PERINT_ENABLE,ONESHOT_ENABLE,CONT_ENABLE,SYNC_DISABLE,SYNC_SRC,OVRFLOW_DISABLE,SIXTEEN_BIT,CHINT_END,CHINT_ENABLE);
//rdreq输出给FIFO
EALLOW;
GpioCtrlRegs.GPBMUX1.bit.GPIO37 = 3; // 选择为片选信号
GpioCtrlRegs.GPBDIR.bit.GPIO37 = 1; // 方向定义为输出
EDIS;
//wrfull输入给DSP
EALLOW;
GpioCtrlRegs.GPAMUX2.bit.GPIO30 = 0; // 选择为通用I/O口
GpioCtrlRegs.GPADIR.bit.GPIO30 = 0; // 方向定义为输入
GpioCtrlRegs.GPAQSEL2.bit.GPIO30 = 0; // 外部中断1（XINT1）与系统时钟SYSCLKOUT同步
EDIS;
//rdempty输入给DSP
EALLOW;
GpioCtrlRegs.GPAMUX2.bit.GPIO29 = 0; // 选择为通用I/O口
GpioCtrlRegs.GPADIR.bit.GPIO29 = 0; // 方向定义为输入
GpioCtrlRegs.GPAQSEL2.bit.GPIO29 = 0; // 外部中断2（XINT1）与系统时钟SYSCLKOUT同步
EDIS;
// 通过GPIO外部中断选择寄存器，选择GPIO30为外部中断1
EALLOW;
GpioIntRegs.GPIOXINT1SEL.bit.GPIOSEL = 0x1e; // XINT1是GPIO30
GpioIntRegs.GPIOXINT2SEL.bit.GPIOSEL = 0x1d; // XINT2是GPIO29
EDIS;
// 配置外部中断1的中断控制寄存器
XIntruptRegs.XINT1CR.bit.POLARITY = 1; // 上升沿触发中断
XIntruptRegs.XINT2CR.bit.POLARITY = 1; // 上升沿触发中断
// 使能外部中断1
XIntruptRegs.XINT1CR.bit.ENABLE = 1; // 使能XINT1
XIntruptRegs.XINT2CR.bit.ENABLE = 1; // 使能XINT2
//步骤6：无限循环
for(;;);
}
//步骤7.在这里插入中断服务子程序，如果需要使用中断服务子程序，必须在步骤5中重新定义中断
//向量表中对应地地址
interrupt void xint1_isr(void)
{
StartDMACH1();
GpioDataRegs.GPBSET.bit.GPIO37 = 1; // 输出高电平,向FIFO发出读信号
// 应答寄存器的位1清0，以响应同组内其他中断；
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}
interrupt void xint2_isr(void)
{
GpioDataRegs.GPBCLEAR.bit.GPIO37 = 1; // 引脚清0
// 应答寄存器的位1清0，以响应同组内其他中断；
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}
void init_zone7(void)
{
EALLOW;
// Make sure the XINTF clock is enabled
SysCtrlRegs.PCLKCR3.bit.XINTFENCLK = 1;
EDIS;
// Configure the GPIO for XINTF with a 16-bit data bus
// This function is in DSP2833x_Xintf.c
InitXintf16Gpio();
/*******
EALLOW;
GpioDataRegs.GPCSET.bit.GPIO72 = 1;
EDIS; ********/
// All Zones---------------------------------
// Timing for all zones based on XTIMCLK = SYSCLKOUT/2
EALLOW;
XintfRegs.XINTCNF2.bit.XTIMCLK = 1;
// Buffer up to 3 writes
XintfRegs.XINTCNF2.bit.WRBUFF = 3;
// XCLKOUT is enabled
XintfRegs.XINTCNF2.bit.CLKOFF = 0;
// XCLKOUT = XTIMCLK/2
XintfRegs.XINTCNF2.bit.CLKMODE = 1;
// Zone 7------------------------------------
// When using ready, ACTIVE must be 1 or greater
// Lead must always be 1 or greater
// Zone write timing
XintfRegs.XTIMING7.bit.XWRLEAD = 1;
XintfRegs.XTIMING7.bit.XWRACTIVE = 2;
XintfRegs.XTIMING7.bit.XWRTRAIL = 1;
// Zone read timing
XintfRegs.XTIMING7.bit.XRDLEAD = 1;
XintfRegs.XTIMING7.bit.XRDACTIVE = 3;
XintfRegs.XTIMING7.bit.XRDTRAIL = 0;
// don't double all Zone read/write lead/active/trail timing
XintfRegs.XTIMING7.bit.X2TIMING = 0;
// Zone will not sample XREADY signal
XintfRegs.XTIMING7.bit.USEREADY = 0;
XintfRegs.XTIMING7.bit.READYMODE = 0;
// 1,1 = x16 data bus
// 0,1 = x32 data bus
// other values are reserved
XintfRegs.XTIMING7.bit.XSIZE = 3;
EDIS;
//Force a pipeline flush to ensure that the write to
//the last register configured occurs before returning.
asm(" RPT #7 || NOP");
}
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