// //###########################################################################
FILE: RAM_management_cpu01.c
TITLE: RAM management Example for F2837xD.
//This example shows how to assign shared RAM for use by both the CPU02
//and CPU01 core. //使用CPU1与CPU2进行通信
//Shared RAM regions are defined in both the CPU02 and CPU01 linker files.
// In this example GS0 and GS14 are assigned to/owned by CPU02. The remaining
// shared RAM regions are owned by CPU01.
//! In this example:
//!
//! A pattern is written to c1_r_w_array and then IPC flag is sent to notify
//! CPU02 that data is ready to be read. CPU02 then reads the data from
//! c2_r_array and writes a modified pattern to c2_r_w_array. Once CPU02 acknowledges
//! the IPC flag to , CPU01 reads the data from c1_r_array and compares with expected
//! result.
//!
//! A Timed ISR is also serviced in both CPUs. The ISRs are copied into the shared
//! RAM region owned by the respective CPUs. Each ISR toggles a GPIO. Watch GPIO31
//! and GPIO34 on oscilloscope. If using the control card watch LED1 and LED2 blink
//! at different rates.
//! - c1_r_w_array[] is mapped to shared RAM GS1
//! - c1_r_array[] is mapped to shared RAM GS0
//! - c2_r_array[] is mapped to shared RAM GS1
//! - c2_r_w_array[] is mapped to shared RAM GS0
//! - cpu_timer0_isr in CPU02 is copied to shared RAM GS14 , toggles GPIO31
//! - cpu_timer0_isr in CPU01 is copied to shared RAM GS15 , toggles GPIO34
//!
//! \b Watch \b Variables
//!
//! - error Indicates that the data written is not correctly received by the other CPU.
//
//###########################################################################
// $TI Release: F2837xD Support Library v190 $
// $Release Date: Mon Feb 1 16:51:57 CST 2016 $
// $Copyright: Copyright (C) 2013-2016 Texas Instruments Incorporated -
// http://www.ti.com/ ALL RIGHTS RESERVED $
//###########################################################################;
以上文档说明指出
#include "F28x_Project.h"
#include "F2837xD_Ipc_drivers.h"
// Data exchange arrays 32*256=2^12
uint16_t c1_r_array[256];
uint16_t c1_r_w_array[256];
#pragma DATA_SECTION(c1_r_array,"SHARERAMGS0"); // 分配到GS0(CPU2)
#pragma DATA_SECTION(c1_r_w_array,"SHARERAMGS1");// 分配到GS1(CPU1)
// Global variables
uint16_t error;
uint16_t multiplier;
// External variables declared by linker.
extern uint16_t isrfuncLoadStart;
extern uint16_t isrfuncLoadEnd;
extern uint16_t isrfuncRunStart;
extern uint16_t isrfuncLoadSize;
// Prototype statements for functions found within this file.
__interrupt void cpu_timer0_isr(void);
#pragma CODE_SECTION(cpu_timer0_isr,"isrfunc") //中断程序放置到GS14
// Functions to read and write data
void Shared_Ram_dataRead_c1(void);
void Shared_Ram_dataWrite_c1(void);
void main(void)
{
//1.初始化程序
InitSysCtrl();
#ifdef _STANDALONE
#ifdef _FLASH
// Send boot command to allow the CPU02 application to begin execution
IPCBootCPU2(C1C2_BROM_BOOTMODE_BOOT_FROM_FLASH);
#else
// Send boot command to allow the CPU02 application to begin execution
IPCBootCPU2(C1C2_BROM_BOOTMODE_BOOT_FROM_RAM);
#endif
#endif //引导CPU2启动
// 2.初始化GPIO:
InitGpio(); // Skipped for this example
// 3.关中断
DINT;
// 初始化PIE
InitPieCtrl();
// 清除中断
IER = 0x0000;
IFR = 0x0000;
// 初始化PIE向量表
InitPieVectTable();
// GPIO31属于CPU2
GPIO_SetupPinMux(31,GPIO_MUX_CPU2,0);
GPIO_SetupPinOptions(31, GPIO_OUTPUT,0);
// GPIO34属于CPU1
GPIO_SetupPinMux(34,GPIO_MUX_CPU1,0);
GPIO_SetupPinOptions(34, GPIO_OUTPUT,0);
// 将GS0和GS14控制权给CPU2
while( !(MemCfgRegs.GSxMSEL.bit.MSEL_GS0 &
MemCfgRegs.GSxMSEL.bit.MSEL_GS14))
{
EALLOW;
MemCfgRegs.GSxMSEL.bit.MSEL_GS0 = 1;//0:CPU1 is master for this memory
//1:CPU2 is master for this memory
MemCfgRegs.GSxMSEL.bit.MSEL_GS14 = 1;
EDIS;
}
// 将中断函数拷贝进入GS14 RAM空间
memcpy(&isrfuncRunStart, &isrfuncLoadStart, (uint32_t)&isrfuncLoadSize);
//指定中断函数
EALLOW; // This is needed to write to EALLOW protected registers
PieVectTable.TIMER0_INT = &cpu_timer0_isr;
EDIS; // This is needed to disable write to EALLOW protected registers
///初始化定时器
InitCpuTimers(); // For this example, only initialize the Cpu Timers
//设置定时器2s
ConfigCpuTimer(&CpuTimer0, 200, 2000000);
//启动定时器
CpuTimer0Regs.TCR.all = 0x4000; // Use write-only instruction to set TSS bit = 0
// 开始中断
IER |= M_INT1;
// 开PIE
PieCtrlRegs.PIEIER1.bit.INTx7 = 1;
// Enable global Interrupts and higher priority real-time debug events:
EINT; // 开全局中断
ERTM; // 开启实时中断
// Main Code
error = 0;
multiplier = 0;
Shared_Ram_dataWrite_c1(); //给c1_r_w_array数组中写入数据内容为[0]:multiplier,[1]-[255]=1-255
IPCLtoRFlagSet(IPC_FLAG10); /挂起中断信号FLAG10
while(1)
{
// 如果没有挂起中断标志(代表CPU2已经操作完毕,ACK了FLAG10)
if(IPCLtoRFlagBusy(IPC_FLAG10) == 0)
{
Shared_Ram_dataRead_c1(); //读取c1_r_array中的数据
if(multiplier++ > 255)
{
multiplier = 0;
} //multipliter++,单只能在0-255中间循环
//给c1_r_w_array数组中写入数据内容为[0]:multiplier,[1]-[255]=1-255
Shared_Ram_dataWrite_c1();
IPCLtoRFlagSet(IPC_FLAG10);
}
}
}
__interrupt void cpu_timer0_isr(void)
{
EALLOW;
CpuTimer0.InterruptCount++; //记录进入中断次数
GpioDataRegs.GPBTOGGLE.bit.GPIO34 = 1; //GPIO34翻转
EDIS;
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1; //清除中断标志
}
void Shared_Ram_dataWrite_c1(void) //写入c1_r_w_array中数据
{
uint16_t index;
// Use first location to write a multiplier.
c1_r_w_array[0] = multiplier; //0
for(index = 1; index < 256; index++)
{
c1_r_w_array[index] = index;
//the following code will attempt to write to a shared RAM
//assigned to cpu2 and as a result will cause an error.
//c1_r_array[index] = 1000 + index;
}
}
//读取CPU2处理后的数据并进行校验是否进行了乘法
void Shared_Ram_dataRead_c1(void)
{
uint16_t index;
if(c1_r_array[0] == multiplier)
{
for(index = 1; index < 256; index++)
{
if(c1_r_array[index] != multiplier*c1_r_w_array[index])
{
error = 1;
}
}
}
else
{
error = 1;
}
}
#include "F28x_Project.h"
#include "F2837xD_Ipc_drivers.h"
uint16_t c2_r_w_array[256];
uint16_t c2_r_array[256];
#pragma DATA_SECTION(c2_r_array,"SHARERAMGS1"); //分配给GS1(CPU1)
#pragma DATA_SECTION(c2_r_w_array,"SHARERAMGS0"); //分配给GS0(CPU2)
// External variables declared by linker.
extern uint16_t isrfuncLoadStart;
extern uint16_t isrfuncLoadEnd;
extern uint16_t isrfuncRunStart;
extern uint16_t isrfuncLoadSize;
// Prototype statements for functions found within this file.
__interrupt void cpu_timer0_isr(void);
#pragma CODE_SECTION(cpu_timer0_isr,"isrfunc")
void Shared_Ram_dataWrite_c2(void);// function to write data from shared RAM owned by c2
void main(void)
{
// InitSysCtrl();
// InitGpio(); // Skipped for this example
DINT;
InitPieCtrl();
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable();
// CPU1未分配RAM就一直等待
while(!( MemCfgRegs.GSxMSEL.bit.MSEL_GS0 &
MemCfgRegs.GSxMSEL.bit.MSEL_GS14 ) )
{
}
// 将中断拷贝进入RAM
memcpy(&isrfuncRunStart, &isrfuncLoadStart, (uint32_t)&isrfuncLoadSize);
EALLOW; // This is needed to write to EALLOW protected registers
PieVectTable.TIMER0_INT = &cpu_timer0_isr;
EDIS; // This is needed to disable write to EALLOW protected registers
InitCpuTimers(); // For this example, only initialize the Cpu Timers
//定时器设置为1s
ConfigCpuTimer(&CpuTimer0, 200, 1000000);
// 启动定时器
CpuTimer0Regs.TCR.all = 0x4000; // Use write-only instruction to set TSS bit = 0
// Step 5. User specific code, enable interrupts:
// Enable CPU int1 which is connected to CPU-Timer 0
IER |= M_INT1;
// Enable TINT0 in the PIE: Group 1 interrupt 7
PieCtrlRegs.PIEIER1.bit.INTx7 = 1;
// Enable global Interrupts and higher priority real-time debug events:
EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM
while(1)
{
//如果CPU1挂起了中断线FLAG10
if(IPCRtoLFlagBusy(IPC_FLAG10) == 1)
{
//Read c2_r_array and modify c2_r_w_array
Shared_Ram_dataWrite_c2(); //处理CPU1传送来的信息
IPCRtoLFlagAcknowledge (IPC_FLAG10); //应答
}
}
}
// function definitions
__interrupt void cpu_timer0_isr(void) //每1s进入一次中断程序
{
EALLOW;
CpuTimer0.InterruptCount++;
GpioDataRegs.GPATOGGLE.bit.GPIO31 = 1; //灯光闪烁一次
EDIS;
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}
// Read data from c2_r_array written by CPU01 and
// modify and write into c2_r_w_array
// c2_r_array[0] is used to hold the multiplier value.
void Shared_Ram_dataWrite_c2(void)
{
uint16_t index;
uint16_t multiplier;
multiplier = c2_r_array[0];
c2_r_w_array[0] = multiplier;
for(index = 1; index < 256; index ++)
{
c2_r_w_array[index] = multiplier*c2_r_array[index];
}
}
本博客仅供记录学习过程和分享学习心得使用,感谢提供源码的公司。
第一次开博客了,想记录一下学习的过程。坐标武汉小硕一名,目前在学习dsp。现在想的是做出双核程序,CPU1跑算法,CPU2通过IPC交互信息后跑通信。
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