【芯昇科技RISC-V生态开发板试用体验】嵌入式工程师的helloWorld! 芯来芯片的流水点灯

本实例是直接在printf打印实例的基础上加的。

#include "main.h"

#include <stdio.h>

/** @addtogroup CM32M4xxR_StdPeriph_Examples

* @{

*/

/** @addtogroup USART_Printf

* @{

*/

typedef enum

{

FAILED = 0,

PASSED = !FAILED

} TestStatus;

#define countof(a)	(sizeof(a) / sizeof(*(a)))

USART_InitType USART_InitStructure;

void RCC_Configuration(void);

void GPIO_Configuration(void);

TestStatus Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength);

/**

* [url=home.php?mod=space&uid=2666770]@Brief[/url] Main function

*/

int main(void)

{

/* System Clocks Configuration */

RCC_Configuration();

/* Configure the GPIO ports */

GPIO_Configuration();

/* USARTy and USARTz configuration ------------------------------------------------------*/

USART_InitStructure.BaudRate            = 115200;

USART_InitStructure.WordLength          = USART_WL_8B;

USART_InitStructure.StopBits            = USART_STPB_1;

USART_InitStructure.Parity              = USART_PE_NO;

USART_InitStructure.HardwareFlowControl = USART_HFCTRL_NONE;

USART_InitStructure.Mode                = USART_MODE_RX | USART_MODE_TX;

/* Configure USARTx */

USART_Init(USARTx, &USART_InitStructure);

/* Enable the USARTx */

USART_Enable(USARTx, ENABLE);

/* Output a message on Hyperterminal using printf function */

printf("

hello world!

");

while (1)

{

//GPIO_SetBits(GPIOA,GPIO_PIN_0);

delay_ms(200);

GPIO_ResetBits(GPIOA,GPIO_PIN_0);

delay_ms(200);

GPIO_SetBits(GPIOB,GPIO_PIN_5);

delay_ms(200);

GPIO_ResetBits(GPIOB,GPIO_PIN_5);

delay_ms(200);

GPIO_SetBits(GPIOB,GPIO_PIN_6);

delay_ms(200);

GPIO_ResetBits(GPIOB,GPIO_PIN_6);

delay_ms(200);

GPIO_SetBits(GPIOB,GPIO_PIN_7);

delay_ms(200);

GPIO_ResetBits(GPIOB,GPIO_PIN_7);

delay_ms(200);

}

}

/**

* @brief  Configures the different system clocks.

*/

void RCC_Configuration(void)

{

/* Enable GPIO clock */

GPIO_APBxClkCmd(RCC_APB2_PERIPH_GPIOA|RCC_APB2_PERIPH_GPIOB, ENABLE);

/* Enable USARTy and USARTz Clock */

USART_APBxClkCmd(USARTx_CLK, ENABLE);

}

/**

* @brief  Configures the different GPIO ports.

*/

void GPIO_Configuration(void)

{

GPIO_InitType GPIO_InitStructure;

GPIO_ConfigPinRemap(GPIO_RMP_USART1,ENABLE);

/* Configure USARTx Tx as alternate function push-pull */

GPIO_InitStructure.Pin        = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_Out_PP;

GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.Pin        = GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_Out_PP;

GPIO_Init(GPIOB, &GPIO_InitStructure);

/* Configure USARTx Rx as input floating */

GPIO_InitStructure.Pin       = USARTx_RxPin;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

GPIO_Init(USARTx_GPIO, &GPIO_InitStructure);

GPIO_ConfigPinRemap(GPIO_RMP3_UART4, ENABLE);

}

/**

* @brief  Compares two buffers.
* [url=home.php?mod=space&uid=3142012]@param[/url]  pBuffer1, pBuffer2: buffers to be compared.
* @param  BufferLength buffer's length
* [url=home.php?mod=space&uid=1141835]@Return[/url] PASSED: pBuffer1 identical to pBuffer2
* 

FAILED: pBuffer1 differs from pBuffer2

**/

TestStatus Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength)

{

while (BufferLength--)

{

if (*pBuffer1 != *pBuffer2)

{

return FAILED;

}

pBuffer1++;

pBuffer2++;

}

return PASSED;

}

/**

* @brief  Redefine printf function.
  */
  int _put_char(int ch)
  {
  USART_SendData(USARTx, (uint8_t)ch);
  
  /* Loop until the end of transmission */
  while (USART_GetFlagStatus(USARTx, USART_FLAG_TXDE) == RESET)
  {
  
  }
  
  return ch;
  }