Hi,all
I need help,I want to use USART2,but it's not working,thanks
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#include <stm32f10x_lib.h> /* STM32F10x Library Definitions */
#include <stdio.h>
unsigned char Clock1s;
extern int SendChar (int ch);
void _ttywrch (int ch) { SendChar(ch); }
void _sys_exit (int return_code) { for (;
; }
int fputc (int ch, FILE *f) { return (SendChar(ch)); }
int ferror (FILE *f) {
/* Your implementation of ferror */
return EOF;
}
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
void SetupClock (void)
{
RCC_DeInit (); /* RCC system reset(for debug purpose)*/
RCC_HSEConfig (RCC_HSE_ON); /* Enable HSE */
/* Wait till HSE is ready */
while (RCC_GetFlagStatus(RCC_FLAG_HSERDY) == RESET);
RCC_HCLKConfig (RCC_SYSCLK_Div1); /* HCLK = SYSCLK */
RCC_PCLK2Config (RCC_HCLK_Div1); /* PCLK2 = HCLK */
RCC_PCLK1Config (RCC_HCLK_Div2); /* PCLK1 = HCLK/2 */
RCC_ADCCLKConfig (RCC_PCLK2_Div4); /* ADCCLK = PCLK2/4 */
*(vu32 *)0x40022000 = 0x01; /* Flash 2 wait state */
/* PLLCLK = 8MHz * 9 = 72 MHz */
RCC_PLLConfig (RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
RCC_PLLCmd (ENABLE); /* Enable PLL */
/* Wait till PLL is ready */
while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
/* Select PLL as system clock source */
RCC_SYSCLKConfig (RCC_SYSCLKSource_PLLCLK);
/* Wait till PLL is used as system clock source */
while (RCC_GetSYSCLKSource() != 0x08);
/* Enable USART1 and GPIOA clock */
RCC_APB1PeriphClockCmd (RCC_APB1Periph_USART2 | RCC_APB2Periph_GPIOD, ENABLE);
/* SysTick event each 10 ms with input clock equal to 9MHz (HCLK/8) */
SysTick_SetReload(720000);
SysTick_ITConfig(ENABLE); /* Enable SysTick interrupt */
}
void SetupUART (void) {
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
/* Enable GPIOA clock */
RCC_APB1PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);
/* Configure USART1 Rx (PA10) as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOD, &GPIO_InitStructure);
/* Configure USART1 Tx (PA9) as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOD, &GPIO_InitStructure);
/* USART1 configured as follow:
- BaudRate = 115200 baud
- Word Length = 8 Bits
- One Stop Bit
- No parity
- Hardware flow control disabled (RTS and CTS signals)
- Receive and transmit enabled
- USART Clock disabled
- USART CPOL: Clock is active low
- USART CPHA: Data is captured on the middle
- USART LastBit: The clock pulse of the last data bit is not output to
the SCLK pin
*/
USART_InitStructure.USART_BaudRate = 115200;
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_InitStructure.USART_Clock = USART_Clock_Disable;
USART_InitStructure.USART_CPOL = USART_CPOL_Low;
USART_InitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_InitStructure.USART_LastBit = USART_LastBit_Disable;
USART_Init(USART2, &USART_InitStructure);
USART_Cmd(USART2, ENABLE);
/* Enable USART1 */
}
/* Implementation of putchar (also used by printf function to output data) */
int SendChar (int ch) { /* Write character to Serial Port */
USART_SendData(USART2, (unsigned char) ch);
while (!(USART2->SR & USART_FLAG_TXE));
return (ch);
}
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/* Includes ------------------------------------------------------------------*/
#include "stdio.h"
#include "stm32f10x_usart.h"
/* Private function prototypes -----------------------------------------------*/
void SetupUART (void);
void SetupClock (void);
int main(){
int m=0;
u16 i=0;
char j;
SetupClock ();
SetupUART ();
printf("\r\n Hello Embest---------");
while(1 )
{
if(USART_GetFlagStatus(USART2,USART_IT_RXNE)==SET)
{
i = USART_ReceiveData(USART2);
printf(" %c",i&0xFF); /* print the input char */
j=i&0xFF ;
}
if ( j=='0') /*if input char equal 0 then print 0 to 100 */
{ for (m=0 ;m<=100;m++)
printf("%d\t",m);
j='p';
}
}
}
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