SMT32 - UART1 설정

UART설정하려면,

/* Enable GPIO clock */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);
/* Enable UART clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);

 

2가지를 꼭 해주어야하는데,

USART1이 AHB1,APB2,... 어디 붙어있는지 알기위해서는, 데이터시트를 뒤지던가, 코드를 뒤지던가 해야한다.

이럴때, 헤더파일만 찾아보면, 쉽게 알 수 있다.

stm32f2xx_rcc.h
/** @defgroup RCC_APB2_Peripherals 

  * @{

  */ 

#define RCC_APB2Periph_TIM1              ((uint32_t)0x00000001)

#define RCC_APB2Periph_TIM8              ((uint32_t)0x00000002)

#define RCC_APB2Periph_USART1            ((uint32_t)0x00000010)

#define RCC_APB2Periph_USART6            ((uint32_t)0x00000020)

#define RCC_APB2Periph_ADC               ((uint32_t)0x00000100)

#define RCC_APB2Periph_ADC1              ((uint32_t)0x00000100)

#define RCC_APB2Periph_ADC2              ((uint32_t)0x00000200)

#define RCC_APB2Periph_ADC3              ((uint32_t)0x00000400)

#define RCC_APB2Periph_SDIO              ((uint32_t)0x00000800)

#define RCC_APB2Periph_SPI1              ((uint32_t)0x00001000)

#define RCC_APB2Periph_SYSCFG            ((uint32_t)0x00004000)

#define RCC_APB2Periph_TIM9              ((uint32_t)0x00010000)

#define RCC_APB2Periph_TIM10             ((uint32_t)0x00020000)

#define RCC_APB2Periph_TIM11             ((uint32_t)0x00040000)

#define IS_RCC_APB2_PERIPH(PERIPH) ((((PERIPH) & 0xFFF8A0CC) == 0x00) && ((PERIPH) != 0x00))

#define IS_RCC_APB2_RESET_PERIPH(PERIPH) ((((PERIPH) & 0xFFF8A6CC) == 0x00) && ((PERIPH) != 0x00))

 

//TX=PA9,RX=PA10
#define UART1_GPIOx    GPIOA
//#define UART1_BaudRate	115200
//#define UART1_BaudRate	57600
//#define UART1_BaudRate	38400
#define UART1_BaudRate    9600
void UART1_Init()
{
    USART_InitTypeDef ui;GPIO_InitTypeDef g;NVIC_InitTypeDef n;

    /* Enable GPIO clock */
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);
    /* Enable UART clock */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);

    /* Connect PXx to USARTx_Tx*/
    GPIO_PinAFConfig(UART1_GPIOx,GPIO_PinSource9,GPIO_AF_USART1);
    /* Connect PXx to USARTx_Rx*/
    GPIO_PinAFConfig(UART1_GPIOx,GPIO_PinSource10,GPIO_AF_USART1);

    /* Configure USART Tx as alternate function  */
    g.GPIO_OType=GPIO_OType_PP;
    g.GPIO_PuPd=GPIO_PuPd_UP;
    g.GPIO_Mode=GPIO_Mode_AF;
    g.GPIO_Pin=GPIO_Pin_9;
    g.GPIO_Speed=GPIO_Speed_2MHz;//GPIO_Speed_50MHz;
    GPIO_Init(UART1_GPIOx,&g);

    /* Configure USART Rx as alternate function  */
    g.GPIO_Mode=GPIO_Mode_AF;
    g.GPIO_Pin=GPIO_Pin_10;
    GPIO_Init(UART1_GPIOx,&g);

    /* Enable USART Interrupt */
    n.NVIC_IRQChannel=USART1_IRQn;
    n.NVIC_IRQChannelPreemptionPriority=15;//0~15 lower priority value indicates a higher priority
    n.NVIC_IRQChannelSubPriority=15;
    n.NVIC_IRQChannelCmd=ENABLE;
    NVIC_Init(&n);

    /* USART configuration */
    ui.USART_BaudRate=UART1_BaudRate;
    ui.USART_WordLength=USART_WordLength_8b;
    ui.USART_StopBits=USART_StopBits_1;
    ui.USART_Parity=USART_Parity_No;
    ui.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
    ui.USART_Mode=USART_Mode_Rx | USART_Mode_Tx;
    USART_Init(USART1,&ui);

    /* Enable Receive interrupts */
    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//Receive Data register not empty interrupt
    //USART_ITConfig(UART1_GPIOx, USART_IT_TXE, ENABLE);//Transmit Data Register empty interrupt
    //USART_ITConfig(UART1_GPIOx, USART_IT_TC, ENABLE);//Transmission complete interrupt

    /* Enable USART */
    USART_Cmd(USART1,ENABLE);
}
void UART1_write(void *pdata,int len)
{
    byte *p=(byte*)pdata;
    while(len)
    {
        UART1_WRITE_BYTE(*p);
        p++;
        len--;
        while(UART1_IS_TX_END()==0)
        {
            CPU_sleep();
        }
    }
}
void UART1_putch(char a)
{
    UART1_write(&a,1);
}
void UART1_puts(char *s)
{
    UART1_write(s,strlen(s));
}