【芯昇科技RISC-V生态开发板试用体验】引脚与定时器输出组合生成简易方波的稳定性测试

方波

方波

今天心血来潮想测试下芯昇科技RISC-V生态开发板的引脚输出及定时器的稳定性，最终以输出的简易方波为测试的结果。

首先在开发板随意且随机的找个引脚，

我这里用的是PB5引脚

而后打印实例的程序基础上加以修改，代码如下：


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/**

[url=home.php?mod=space&uid=1455510]@file[/url] main.c
[url=home.php?mod=space&uid=40524]@author[/url] CMIOT Firmware Team
[url=home.php?mod=space&uid=644434]@version[/url] v1.0.0
[url=home.php?mod=space&uid=855824]@copyright[/url] Copyright (c) 2020, CMIOT. All rights reserved.
*/
#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("\n\rhello world!\n\r");

while (1)
{

GPIO_SetBits(GPIOB,GPIO_PIN_5);//
 delay_us(180);
 GPIO_ResetBits(GPIOB,GPIO_PIN_5);//
 delay_us(160);
//
// GPIO_SetBits(GPIOB,GPIO_PIN_5);
// delay_ms(50);
// GPIO_ResetBits(GPIOB,GPIO_PIN_5);
// delay_ms(50);
//
// GPIO_SetBits(GPIOB,GPIO_PIN_6);
// delay_ms(50);
// GPIO_ResetBits(GPIOB,GPIO_PIN_6);
// delay_ms(50);
//
// GPIO_SetBits(GPIOB,GPIO_PIN_7);
// delay_ms(50);
// GPIO_ResetBits(GPIOB,GPIO_PIN_7);
// delay_ms(50);
//
//
//
//
//
// GPIO_SetBits(GPIOB,GPIO_PIN_7);
// delay_ms(50);
// GPIO_ResetBits(GPIOB,GPIO_PIN_7);
// delay_ms(50);
//
// GPIO_SetBits(GPIOB,GPIO_PIN_6);
// delay_ms(50);
// GPIO_ResetBits(GPIOB,GPIO_PIN_6);
// delay_ms(50);
//
// GPIO_SetBits(GPIOB,GPIO_PIN_5);
// delay_ms(50);
// GPIO_ResetBits(GPIOB,GPIO_PIN_5);
// delay_ms(50);
//
// GPIO_SetBits(GPIOA,GPIO_PIN_0);
// delay_ms(50);
// GPIO_ResetBits(GPIOA,GPIO_PIN_0);
// delay_ms(50);

}
}

/**

@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_11| 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;
}

/**

@}
*/
/**

@}
/
/******************************************************************************/