STM32F407串口通讯失败怎么回事

ddfha1 · 发表于 2023-11-13 15:43:40

本人现在用STM32F407寄存器版本进行串口通讯，从串口1-6通讯都失败，请问怎么回事

//------------------------------------------------------------------------------------------------------------------
#define UART5_TX_GPIO_PORT                GPIOC
#define UART5_TX_GPIO_PIN                SYS_GPIO_PIN12
#define UART5_TX_GPIO_AF                   7                         /* AF1|ÄüÑ¡Ôñ */
#define UART5_TX_GPIO_CLK_ENABLE()       do{ RCC->AHB1ENR |= 1 << 2; }while(0) /* PA¿úê±Öóê1Äü */

#define UART5_RX_GPIO_PORT                GPIOD
#define UART5_RX_GPIO_PIN                SYS_GPIO_PIN2
#define UART5_RX_GPIO_AF                   7                         /* AF1|ÄüÑ¡Ôñ */
#define UART5_RX_GPIO_CLK_ENABLE()       do{ RCC->AHB1ENR |= 1 << 3; }while(0) /* PA¿úê±Öóê1Äü */

#define UART5_UX                         UART5
#define UART5_UX_IRQn                      UART5_IRQn
#define UART5_UX_IRQHandler                UART5_IRQHandler
#define UART5_UX_CLK_ENABLE()             do{ RCC->APB1ENR |= 1 << 20; }while(0) /* USART1 ê±Öóê1Äü */

void uart5_init(uint32_t sclk, uint32_t baudrate)
{
uint32_t temp;
/* IO ¼° ê±ÖóÅäÖÃ */
UART5_TX_GPIO_CLK_ENABLE(); /* ê1Äü′®¿úTX½Åê±Öó */
UART5_RX_GPIO_CLK_ENABLE(); /* ê1Äü′®¿úRX½Åê±Öó */
UART5_UX_CLK_ENABLE();    /* ê1Äü′®¿úê±Öó */

sys_gpio_set(UART5_TX_GPIO_PORT, UART5_TX_GPIO_PIN,
               SYS_GPIO_MODE_AF, SYS_GPIO_OTYPE_PP, SYS_GPIO_SPEED_MID, SYS_GPIO_PUPD_PU); /* ′®¿úTX½Å Ä￡ê½éèÖÃ */

sys_gpio_set(UART5_RX_GPIO_PORT, UART5_RX_GPIO_PIN,
               SYS_GPIO_MODE_AF, SYS_GPIO_OTYPE_PP, SYS_GPIO_SPEED_MID, SYS_GPIO_PUPD_PU); /* ′®¿úRX½Å Ä￡ê½éèÖÃ */

sys_gpio_af_set(GPIOC, UART5_TX_GPIO_PIN, UART5_TX_GPIO_AF); /* TX½Å ¸′óÃ1|ÄüÑ¡Ôñ, ±ØDëéèÖÃÕyè· */
sys_gpio_af_set(GPIOD, UART5_RX_GPIO_PIN, UART5_RX_GPIO_AF); /* RX½Å ¸′óÃ1|ÄüÑ¡Ôñ, ±ØDëéèÖÃÕyè· */

temp = (sclk * 1000000 + baudrate / 2) / baudrate;             /* μÃμ½USARTDIV@OVER8 = 0, 2éóÃËÄéáÎåèë¼ÆËã */
/* 2¨ìØÂêéèÖÃ */
UART5_UX->BRR = temp;    /* 2¨ìØÂêéèÖÃ@OVER8 = 0 */
UART5_UX->CR1 = 0;       /* ÇåáãCR1¼Ä′æÆ÷ */
UART5_UX->CR1 |= 0 << 12; /* éèÖÃM = 0, Ñ¡Ôñ8Î»×Ö3¤ */
UART5_UX->CR1 |= 0 << 15; /* éèÖÃOVER8 = 0, 16±¶1y2éÑù */
UART5_UX->CR1 |= 1 << 3; /* ′®¿ú·￠Ëíê1Äü */

/* ê1Äü½óêÕÖD¶Ï */
UART5_UX->CR1 |= 1 << 2; /* ′®¿ú½óêÕê1Äü */
UART5_UX->CR1 |= 1 << 5; /* ½óêÕ»o3åÇø·Ç¿ÕÖD¶Ïê1Äü */
sys_nvic_init(3, 3, UART5_UX_IRQn, 2); /* ×é2￡¬×îμíóÅÏè¼¶ */

UART5_UX->CR1 |= 1 << 13; /* ′®¿úê1Äü */
}

void UART5_UX_IRQHandler(void)
{
uint8_t rxdata;

if (UART5_UX->SR & (1 << 5))             /* ½óêÕμ½êy¾Y */
{
      rxdata = UART5_UX->DR;

                  uart5_rx_buf[uart5_rx_counter] = rxdata; /* ′æ′￠êy¾Yμ½ g_usart_rx_buf */
                  uart5_rx_counter++;
  }

}

yangwang1025 · 发表于 2023-11-13 16:06:28

你说的通讯失败是什么说清楚一下，是你用串口调试助手发送数据，没进入接收中断服务函数还是没打印任何数据？

ddfha1 · 发表于 2023-11-13 17:26:48

串口助手有数据，但是单片机接收不到数据

阿侑kevin · 发表于 2023-11-14 11:02:29

中断、GPIO配置、外部电路挨个查一遍咯

帐号		自动登录	找回密码
密码			立即注册

STM32F407串口通讯失败怎么回事

原子哥极力推荐 /2