arm单片机w7500p如何使用gpio，通过按键来控制gpio，然后通过串口送出去。

按键按下去gpio为1，然后把gpio的数据1通过串口发送出去，然后在串口调试助手中显示1。
一下是我的代码我觉得逻辑没有问题，求大神指点

#include
#include "W7500x_uart.h"
#include "W7500x_gpio.h"
#include "W7500X_crg.h"
#include "print_x.h"__
#include "key.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/

GPIO_InitTypeDef GPIO_InitDef;
UART_InitTypeDef UART_InitStructure;
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

void delay_ms(__IO uint32_t nCount);

/**

• @brief Main program
• @param None

• @retval None
  */

  /* GPIO LED(B) Set */

int main()
{

unsigned char s='1';
    uint8_t i;
    uint16_t num;
    char str[10]="";
/*System clock configuration*/
    SystemInit();    

// *(volatile uint32_t *)(0x41001014) = 0x0060100; //clock setting 48MHz

/* CLK OUT Set */
PAD_AFConfig(PAD_PA,GPIO_Pin_12, PAD_AF1); // PAD Config - CLKOUT used 3nd Function    
/* UART0 and UART1 configuration*/
UART_StructInit(&UART_InitStructure);
/* Configure UART0 */
UART_Init(UART1,&UART_InitStructure);
    UART_ITConfig(UART1,UART_IT_FLAG_RXI,ENABLE);
     S_UART_Init(115200);
     //S_UART_SetBaud(115200);
     KEY_Init();
/* Retarget functions for GNU Tools for ARM Embedded Processors*/


    GPIO_InitDef.GPIO_Pin = GPIO_Pin_12; // Set to Pin_5 (LED(B))
GPIO_InitDef.GPIO_Mode = GPIO_Mode_OUT; // Set to Mode Output
GPIO_Init(GPIOC, &GPIO_InitDef);
PAD_AFConfig(PAD_PC,GPIO_Pin_12, PAD_AF1); // PAD Config - LED used 2nd Function

// GPIO_SetBits(GPIOC, GPIO_Pin_12); // LED(B) Off

    while(1)
    {
        if(KEY_Csan() == 0)
            i++;

            if(i%2 == 0)
            {
                GPIO_SetBits(GPIOC, GPIO_Pin_12);
                num=GPIO_ReadOutputData(GPIOC);
                UART_SendData(UART1,num);

                //S_UART_SendData(num);
                str[0]=num+48;
                prt_str(str);
            }
            else
            {
                GPIO_ResetBits(GPIOC, GPIO_Pin_12);
                num=GPIO_ReadOutputData(GPIOC);
                UART_SendData(UART1,num);

                //UART_SendData(num);
                str[0]=num+48;
                prt_str(str);
            }

    }
/*  
for(;;)
    {
        S_UART_SendData(s);

        printf("UART 1 Test(#1)\r\n");
        prt_str("\r\11\r\n");

    }

// UartPuts(UART1,"UART 1 Test(#1)\r\n");
*/

}

void delay_ms(__IO uint32_t nCount)
{
volatile uint32_t delay = nCount * 2500; // approximate loops per ms at 24 MHz, Debug config
for(; delay != 0; delay--)
__NOP();
}