用其他芯片通过SWD协议给STM32F103RET6下载程序遇到的问题

fancy0411 提问时间：2020-4-13 13:33 /

问答
是否解决:

现在在做一个下载器，就是用STM32F405芯片模拟SWD协议给STM32F103RET6芯片下载程序，通过规格书发现F103系列芯片的闪存编程使能是半字的形式，但是SWD协议是4字节的，通过什么方式能给flash按照半字的形式下载程序。有谁研究过这个的，能不能给个DEMO程序看看。
这是我的一部分程序：
uint8_t swd_write_block(uint32_t address, uint8_t *data, uint32_t size)
{
   uint8_t tmp_in[4], req;
   uint32_t size_in_words,size_send;
   uint32_t i, ack,tmp;

   if (size==0)
      return 0;

   size_in_words = size/4;
   if (!swd_write_ap(AP_CSW, CSW_VALUE | CSW_SIZE16))
      {
      return 0;
   }
// TAR write
   req = SWD_REG_AP | SWD_REG_W | (1 << 2);
   int2array(tmp_in, address, 4);
   if (swd_transfer_retry(req, (uint32_t *)tmp_in) != 0x01)
               {
      return 0;
         }
   // DRW write
   req = SWD_REG_AP | SWD_REG_W | (3 << 2);
   for (i = 0; i < size_in_words; i++)
   {
   if (swd_transfer_retry(req,  (uint32_t *)data) != 0x01)
         {
         return 0;
      }
      data+=4;
}
   // dummy read
   req = SWD_REG_DP | SWD_REG_R | SWD_REG_ADR(DP_RDBUFF);
   ack = swd_transfer_retry(req, NULL);
   return (ack == 0x01);
}

赞收藏评论1 发布时间：2020-4-13 13:33

1个回答

跟风和天空对话回答时间：2020-4-14 11:37:55

不了解SWD原理，只是猜测
uint8_t swd_write_block(uint32_t address, uint8_t *data, uint32_t size)
{
uint8_t tmp_in[4], req;
uint32_t size_in_words,size_send;
uint32_t i, ack,tmp;

if (size==0)
return 0;

size_in_words = size/2;//计算半字数 //size_in_words = size/4;       //计算字数
if (!swd_write_ap(AP_CSW, CSW_VALUE | CSW_SIZE16))//？？
{
return 0;
}
// TAR write
req = SWD_REG_AP | SWD_REG_W | (1 << 2);

int2array(tmp_in, address, 2); //int2array(tmp_in, address, 4);
if (swd_transfer_retry(req, (uint32_t *)tmp_in) != 0x01)
{
      return 0;
}

// DRW write
req = SWD_REG_AP | SWD_REG_W | (3 << 2);
for (i = 0; i < size_in_words; i++)
{
if (swd_transfer_retry(req,  (uint32_t *)data) != 0x01)
{
return 0;
}
data+=2;//data+=4;
}
   // dummy read
req = SWD_REG_DP | SWD_REG_R | SWD_REG_ADR(DP_RDBUFF);
ack = swd_transfer_retry(req, NULL);
return (ack == 0x01);
}