GD32E230的datasheet中可以看到PB和PB7是可以复用到USART0的，然后使用官方的例程，将官方例程默认引进从PA9、PA10改成PB6、PB7，结果串口就不打印了。用PA9、PA10却可以。
请教一下有没有人知道PB6、PB7怎么当串口0使用？
以下是官方例程，我将引脚宏定义改成PB6和PB7：
/* definition for COM, connected to USART0 */
#define EVAL_COM USART0
#define EVAL_COM_CLK RCU_USART0
#define EVAL_COM_TX_PIN GPIO_PIN_6
#define EVAL_COM_RX_PIN GPIO_PIN_7
#define EVAL_COM_GPIO_PORT GPIOB
#define EVAL_COM_GPIO_CLK RCU_GPIOB
#define EVAL_COM_AF GPIO_AF_1
/*!
\brief configure COM port
\param[in] com: COM on the board
\arg EVAL_COM: COM on the board
\param[out] none
\retval none
*/
void gd_eval_com_init(uint32_t com)
{
uint32_t COM_ID;
COM_ID = 0U;
/* enable COM GPIO clock */
rcu_periph_clock_enable(EVAL_COM_GPIO_CLK);
/* enable USART clock */
rcu_periph_clock_enable(COM_CLK[COM_ID]);
/* connect port to USARTx_Tx */
gpio_af_set(EVAL_COM_GPIO_PORT, EVAL_COM_AF, COM_TX_PIN[COM_ID]);
/* connect port to USARTx_Rx */
gpio_af_set(EVAL_COM_GPIO_PORT, EVAL_COM_AF, COM_RX_PIN[COM_ID]);
/* configure USART Tx as alternate function push-pull */
gpio_mode_set(EVAL_COM_GPIO_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, COM_TX_PIN[COM_ID]);
gpio_output_options_set(EVAL_COM_GPIO_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, COM_TX_PIN[COM_ID]);
/* configure USART Rx as alternate function push-pull */
gpio_mode_set(EVAL_COM_GPIO_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, COM_RX_PIN[COM_ID]);
gpio_output_options_set(EVAL_COM_GPIO_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, COM_RX_PIN[COM_ID]);
/* USART configure */
usart_deinit(com);
usart_baudrate_set(com, 115200U);
usart_receive_config(com, USART_RECEIVE_ENABLE);
usart_transmit_config(com, USART_TRANSMIT_ENABLE);
usart_enable(com);
}
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