请教关于STM32的JTAG编程问题
最近要做一个手持下载器，用AT89S52通过JTAG方式给STM32下载程序。由于原来没做过相关的东西，所以网上找了一下相关的资料，照着现有的历程测试了下，发现的以下几个问题

1，STM32对应的BSD文件中，写着
attribute INSTRUCTION_OPCODE of STM32F103C8: entity is
"BYPASS (11111)," &
"EXTEST (00000)," &
"SAMPLE (00010)," &
"PRELOAD (00010)," &
"IDCODE (00001)";
那么我用IDCODE指令去读取CPUID，代码如下
//P1_3 P1_5 P1_6引脚对应TDI TCK TMS
//P3_0对应TDO

#define JTAG_DELAY() _nop_()
#define JTAG_GET_TDO()((P3_0==1) ? 1:0)

void nvdJTAG_Set(unsigned char Control)
{
P1 = Control;
}

void JTAG_ReadId(void)
{
inti;
charid[32]；

JTAG_RunTestldleState();

nvdJTAG_Set(TDI_H | TMS_H | TCK_L);JTAG_DELAY();
nvdJTAG_Set(TDI_H | TMS_H | TCK_H);JTAG_DELAY(); // Select-DR Scan Status

nvdJTAG_Set(TDI_H | TMS_H | TCK_L);JTAG_DELAY();
nvdJTAG_Set(TDI_H | TMS_H | TCK_H);JTAG_DELAY(); // Select-IR Scan Status

nvdJTAG_Set(TDI_H | TMS_L | TCK_L);JTAG_DELAY();
nvdJTAG_Set(TDI_H | TMS_L | TCK_H);JTAG_DELAY(); // Capture-IR Status

nvdJTAG_Set(TDI_H | TMS_L | TCK_L);JTAG_DELAY();
nvdJTAG_Set(TDI_H | TMS_L | TCK_H);JTAG_DELAY(); // Shift-IR Status

//STM32F103XX IDCODE Instruction "00001"
nvdJTAG_Set(TDI_H | TMS_L | TCK_L);JTAG_DELAY();
nvdJTAG_Set(TDI_H | TMS_L | TCK_H);JTAG_DELAY(); // '1'

nvdJTAG_Set(TDI_L | TMS_L | TCK_L);JTAG_DELAY();
nvdJTAG_Set(TDI_L | TMS_L | TCK_H);JTAG_DELAY(); // '0'

nvdJTAG_Set(TDI_L | TMS_L | TCK_L);JTAG_DELAY();
nvdJTAG_Set(TDI_L | TMS_L | TCK_H);JTAG_DELAY(); // '0'

nvdJTAG_Set(TDI_L | TMS_L | TCK_L);JTAG_DELAY();
nvdJTAG_Set(TDI_L | TMS_L | TCK_H);JTAG_DELAY(); // '0'

nvdJTAG_Set(TDI_L | TMS_H | TCK_L);JTAG_DELAY();
nvdJTAG_Set(TDI_L | TMS_H | TCK_H);JTAG_DELAY(); // '0', //Exit1-IR

nvdJTAG_Set(TDI_H | TMS_H | TCK_L);JTAG_DELAY();
nvdJTAG_Set(TDI_H | TMS_H | TCK_H);JTAG_DELAY(); // Update_IR

nvdJTAG_Set(TDI_H | TMS_H | TCK_L);JTAG_DELAY();
nvdJTAG_Set(TDI_H | TMS_H | TCK_H);JTAG_DELAY(); // Select-DR-Scan

nvdJTAG_Set(TDI_H | TMS_L | TCK_L);JTAG_DELAY();
nvdJTAG_Set(TDI_H | TMS_L | TCK_H);JTAG_DELAY(); //Capture-DR

nvdJTAG_Set(TDI_H | TMS_L | TCK_L);JTAG_DELAY();
nvdJTAG_Set(TDI_H | TMS_L | TCK_H);JTAG_DELAY(); //Shift-DR

// Read IDcode..
for( i=0 ; i<=30 ; i++) {
nvdJTAG_Set(TDI_H | TMS_L | TCK_L);JTAG_DELAY();
nvdJTAG_Set(TDI_H | TMS_L | TCK_H);JTAG_DELAY(); //Shift-DR
id[i] = (char)JTAG_GET_TDO();
}

nvdJTAG_Set(TDI_H | TMS_H | TCK_L);JTAG_DELAY();
nvdJTAG_Set(TDI_H | TMS_H | TCK_H);JTAG_DELAY(); //Exit1_DR
id[i] = (char)JTAG_GET_TDO();

nvdJTAG_Set(TDI_H | TMS_H | TCK_L);JTAG_DELAY();
nvdJTAG_Set(TDI_H | TMS_H | TCK_H);JTAG_DELAY(); // Update_DR

nvdJTAG_Set(TDI_H | TMS_L | TCK_L);JTAG_DELAY(); //
nvdJTAG_Set(TDI_H | TMS_L | TCK_H);JTAG_DELAY(); // Run-Test/Idle
nvdJTAG_Set(TDI_H | TMS_L | TCK_L);JTAG_DELAY();
nvdJTAG_Set(TDI_H | TMS_L | TCK_H);JTAG_DELAY(); // Run-Test/Idle
nvdJTAG_Set(TDI_H | TMS_L | TCK_L);JTAG_DELAY();
nvdJTAG_Set(TDI_H | TMS_L | TCK_H);JTAG_DELAY(); // Run-Test/Idle
}

可是取到的32位ID值，每一位总是常为1，不是正确值。现在STM32的板子可以通过ULink正常写程序。
请问这是怎么回事，是不是JTAG_DELAY()函数的延时不对？还是硬件上需要有特殊的电路？


[解决办法]
您好
我现在也正在做stm32的手持下载器，一头雾水，能帮忙指点下吗，要访问stm32的flash寄存器，其jtag命令是什么？我的qq147171234 一起讨论下，我是用AVR单片机。
[解决办法]
没具体弄过这方面的东西，MARK

帮顶下、

[解决办法]
lz做下载器还是做加密器呀,读id,是为了加密吧

S52的flash 空间好像不大, 能下载什么给stm32单片机呀,

st的spi下载程序是开源的,你可以做串口下载器,或者加密器,

我做了一个串口的,硬件很简单,主要是软件实现的,你也可以自己做一个,

我做的是加密器,hoho,