TFT液晶显示问题求助大家，写不进去变量，会白屏卡住。

河马沫沫 · 发表于 2020-5-17 10:48:22

刚接触STM32没多久还是个小白，希望大家指导一下，用的原子哥的mini板，串口2接收角度模块的数据，串口1打印出来，目前在串口助手查看是可以正确读取到的。
我想在TFTLCD上把读到的变量数据显示出来，LCD_ShowString写的静态的字符串可以正确显示，但是加进去LCD_ShowNum显示变量就会白屏或者一直是0，
用Jlink调试了一下，设置的显示变量都是正常变化的，也尝试过把变量转换成字符串用

LCD_ShowString显示，还是不行。

下边红色代码是我尝试显示的其中一条信息，不知道怎么写函数才能正确实现，希望大家指点一下我。。谢谢啦

#include "stm32f10x.h"
#include "string.h"
#include "delay.h"
#include "LED.h"
#include "usart.h"
#include "stdio.h"
#include "lcd.h"
/*
Keil: MDK5.10.0.2
MCU:stm32f103c8
????:
GY---STM32
1GY_RX---STM32_TX2(PIN_A2),STM32
2GY_TX---STM32_RX2(PIN_A3)
3STM32_TX1(PIN_A9)---FT232_RX,STM32
*/

static void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_X;
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
NVIC_X.NVIC_IRQChannel = USART2_IRQn;//????
  NVIC_X.NVIC_IRQChannelPreemptionPriority = 0;//?????
  NVIC_X.NVIC_IRQChannelSubPriority = 0;//?????
  NVIC_X.NVIC_IRQChannelCmd = ENABLE;//??????
  NVIC_Init(&NVIC_X);
}
/*
void send_Instruction(void)
{
uint8_t send_data[4]={0};
send_data[0]=0xa5;
send_data[1]=0x55;
send_data[2]=0x50;
send_data[3]=0x4a;
USART_Send_bytes(send_data,4);//????/???????

delay_ms(100);

send_data[0]=0xa5;
send_data[1]=0x56;
send_data[2]=0x02;
send_data[3]=0xfd;
USART_Send_bytes(send_data,4);//????????
delay_ms(100);
}*/
int fputc(int ch, FILE *f)
{
while (!(USART1->SR & USART_FLAG_TXE));
USART_SendData(USART1, (unsigned char) ch);//
return (ch);
}
int main(void)
{
short ROLL;
char str[20];
// u8 ROL[12];
uint8_t data_buf[50]={0},count=0;
int16_t rpy[3],Acc[3],Gyr[3],Mag[3],Q[4],Temp=0,Altitude=0;
// uint32_t pressure=0;
delay_init(72);//72M
LED_Int(GPIOB,GPIO_Pin_9,RCC_APB2Periph_GPIOB);//led
Usart_Int(9600);//115200
Usart_Int2(9600);
LCD_Init();
LCD_ShowString(30,200,200,16,16," Temp: . C");
  LCD_ShowString(30,220,200,16,16,"Pitch: . C");
  LCD_ShowString(30,240,200,16,16," Roll: . C");
  LCD_ShowString(30,260,200,16,16," Yaw : . C");
NVIC_Configuration();//设置串口中断
//send_Instruction();//
GPIO_SetBits(GPIOB,GPIO_Pin_9);
while(1)
{
  GPIO_SetBits(GPIOB,GPIO_Pin_9);//LED
  if(!stata)
continue;
stata=0;
  if(CHeck(data_buf))
  {
count=0;
   if(data_buf[2]&0x01) //ACC
{
   Acc[0]=(data_buf[4]<<8)|data_buf[5];
   Acc[1]=(data_buf[6]<<8)|data_buf[7];
   Acc[2]=(data_buf[8]<<8)|data_buf[9];
//  printf("GYRO: %.2f,%.2f ,%.2f ",(float) Acc[0]/32767,(float) Acc[1]/32767,(float) Acc[2]/32767);
      count=6;
}
   if(data_buf[2]&0x02) //GYRO
{
   Gyr[0]=(data_buf[4+count]<<8)|data_buf[5+count];
   Gyr[1]=(data_buf[6+count]<<8)|data_buf[7+count];
   Gyr[2]=(data_buf[8+count]<<8)|data_buf[9+count];
//  printf("GYRO: %.2f,%.2f ,%.2f ",(float) Gyr[0]/2000,(float) Gyr[1]/2000,(float) Gyr[2]/2000);
      count+=6;
}
//    if(data_buf[2]&0x04) //MAG
// {
//    Mag[0]=(data_buf[4+count]<<8)|data_buf[5+count];
//    Mag[1]=(data_buf[6+count]<<8)|data_buf[7+count];
//    Mag[2]=(data_buf[8+count]<<8)|data_buf[9+count];
//       count+=6;
// }

   if(data_buf[2]&0x10) //???
{
   rpy[0]=(data_buf[4+count]<<8)|data_buf[5+count];
   rpy[1]=(data_buf[6+count]<<8)|data_buf[7+count];
   rpy[2]=(data_buf[8+count]<<8)|data_buf[9+count];
   ROLL=rpy[0]/100;
   LCD_ShowNum(100,160,ROLL,10,16);
   printf("RPY: %.2f,%.2f ,%.2f ",(float) rpy[0]/100,(float) rpy[1]/100,(float) rpy[2]/100);
      count+=6;
}
   if(data_buf[2]&0x40) //??
{
   Temp=(data_buf[4+count]<<8)|data_buf[5+count];
   printf(" ,Temp: %.2f ? \r\n",(float) Temp/100);
      count+=2;
}
delay_ms(10);
  }

}

}

把完整程序上传给大家看一下，感谢！