找到了407的例程了，串口可以打印数据了，把我的结果代码贴出来
与大家分享：

void COM1Init(u32 BaudRate) {   GPIO_InitTypeDef GPIO_InitStructure;   USART_InitTypeDef USART_InitStructure;      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);   GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1);     GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;   GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;   GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;   GPIO_Init(GPIOA, &GPIO_InitStructure);       USART_InitStructure.USART_BaudRate = BaudRate;//波特率设置   USART_InitStructure.USART_WordLength = USART_WordLength_8b;   USART_InitStructure.USART_StopBits = USART_StopBits_1;   USART_InitStructure.USART_Parity = USART_Parity_No;   USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;   USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;    USART_Init(USART1, &USART_InitStructure);   USART_Cmd(USART1, ENABLE);   USART_ClearFlag(USART1, USART_FLAG_TC); }
void TracePrintfln(char *format, ... ) { char str_temp[256]; va_list vaotr; int i, len; va_start(vaotr, format); vsprintf(str_temp, format, vaotr); va_end(vaotr); //h83029_sci1_UART_send_string(str_temp); len = strlen(str_temp); for (i = 0; i < len; i++) { USART_SendData(USART1, str_temp); while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET); }
USART_SendData(USART1, ' '); while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET); }
使用的时候：
COM1Init(115200);
TracePrintfln("trace function ok!");

但是还有一个问题，我要打印的字符串的第一个字符丢失了，就是说，
上面语句打印出来的结果是 "race function ok!"。
不知道是怎么回事。