Help Me!
用的芯片是TMS320VC5509A，开发环境是CCS3.1，仿真器是合众达的SEED XDS510USB2.0，用C语言编写。在开发过程中遇到几个问题，希望大虾不吝赐教。
1. 在CCS3.1 SETUP下，选择C5509A XDS510 Emulator，启动CCS3.1，连接仿真器和目标板时，Messages窗口出现“GEL: Error while executing OnTargetConnect(): memory map prevented write to target memory at 0x0007FE@I/O.”。是什么原因？而在在CCS3.1 SETUP下，选择C5509 XDS510 Emulator，则没出现上述问题。
2. I2C外接AT24C256。DSP工作在MASTER MODE。利用CSL的API函数，初始化I2C模块时，程序如下：
#include <csl.h>
#include <csl_chip.h>
#include <csl_i2c.h>
#include <csl_pll.h>
//---------Global data definition---------
int x=1,y=1,z=1;
Uint16 databyte1[7] = {0,0x10,0x11,0x12,0x13,0x14,0x15};
Uint16 datareceive1[6]={0,0,0,0,0,0};
Uint16 databyte2[7] = {0,0x15,0x20,0x21,0x22,0x23,0x24};
Uint16 datareceive2[10]={0,0,0,0,0,0,0,0,0,0};
Uint16 slaveaddressreceive[2]={0,0x10};
// Create and initialize an PLL initialization structure
// DSP CLK = 12X24/2 = 144MHz
PLL_Config ConfigPLL = {
1,
1,
24,
1
};
// Create and initialize an I2C initialization structure
I2C_Setup Init_I2C = {
0, // 7 bit address mode
0x0000, // own address - don't care if master
144, // clkout value (Mhz)
200, // a number between 10 and 400
0, // 8 bits/byte to be received or transmitted
0, // DLB mode on
1 // FREE mode of operation on
};
//---------Function prototypes---------
void taskFunc(void);
void delay(void);
//---------main routine---------
void main(void)
{
CSL_init();
 LL_config(&ConfigPLL);
I2C_setup(&Init_I2C);
taskFunc();
while(1);
}
void taskFunc(void)
{
x=I2C_write(databyte1,7,1,0x50,1,30000);
y=I2C_write(slaveaddressreceive,2,1,0x50,2,30000);
z=I2C_read(datareceive1,5,1,0x50,3,30000,0);
I2C_sendStop();
x=I2C_write(databyte2,7,1,0x50,1,30000);
y=I2C_write(slaveaddressreceive,2,1,0x50,2,30000);
z=I2C_read(datareceive2,10,1,0x50,3,30000,0);
I2C_sendStop();
x=1;
}
以上程序在调试过程中遇到了2个问题：
1. 当注释掉PLL_config(&ConfigPLL)语句，或将其置于taskFunc()后，则程序能读写AT24C256，反之则不能正确读写；
2. 在能读写AT24C256的情况下，即注释掉PLL_config(&ConfigPLL)，第一次写I2C_write(databyte1,7,1,0x50,1,30000)能正确执行，因为I2C_read(datareceive1,5,1,0x50,3,30000,0)能正确读出写进的数据，但第二次写I2C_write(databyte2,7,1,0x50,1,30000)不能正确执行，因为z=I2C_read(datareceive2,10,1,0x50,3,30000,0)不能正确读出写进的数据。当注释掉 y=I2C_write(slaveaddressreceive,2,1,0x50,2,30000);
z=I2C_read(datareceive1,5,1,0x50,3,30000,0);
I2C_sendStop();
三条语句时，I2C_read(datareceive2,10,1,0x50,3,30000,0)能正确读出两次写入的数据。似乎I2C_read(datareceive2,10,1,0x50,3,30000,0)有问题，AT24C256输出数据完毕，最后要求MASTER发送NACK信号，I2C_read（）没有发。怎样解决该问题？帮帮忙，多谢了！
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