KEIL ARM编译器对于sprintf函数，把float转换字符的问题。。

冰是睡着的水

            sprintf(ADC_BUFF,"ADC1_0:%5.3f,ADC1_1:%5.3f,ADC1_2:%5.3f,ADC1_3:5.3%f",
                              ADC_Voltage[0],ADC_Voltage[1],
                              ADC_Voltage[2],ADC_Voltage[3]);

ADC_BUFF内存缓存已经200了。。执行几次就到内存访问错误了。。。网上都找不到答案。。请教原子哥，各位大虾。。  

正点原子

访问错误？什么现象？

冰是睡着的水

回复【2楼】正点原子:
---------------------------------
死机了。。。程序不跑了。。。很奇怪。。。

SART1 CREATE
COMMAND CREATE
PROCESSTASK CREATE
ucGUI CREATE
ADC1_0:0.000,ADC1_1:0.000,ADC1_2:-0.000,ADC1_3:5.3-2.000000
ADC1_0:0.000,ADC1_1:-0.000,ADC1_2:-0.000,ADC1_3:5.32681562225727946500000
000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000.000000
ADC1_0:0.000,ADC1_1:-0.000,ADC1_2:-2.000,ADC1_3:5.32.000000
ADC1_0:0.000,ADC1_1:0.000,ADC1_2:2.000,ADC1_3:5.3-0.000000
ADC1_0:0.000,ADC1_1:0.000,ADC1_2:0.000,ADC1_3:5.32.000000
ADC1_0:0.000,ADC1_1:2.000,ADC1_2:-0.000,ADC1_3:5.32681562225727946500000000000
00000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000.000000
ADC1_0:0.000,ADC1_1:-0.000,ADC1_2:-0.000,ADC1_3:5.32.000000
ADC1_0:0.000,ADC1_1:0.000,ADC1_2:2.000,ADC1_3:5.3268156222572769520000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000
000000000000000000000000000000000000000000000000.000000ADC1_0:0.000,ADC1_1:2.000,ADC1_2:-0.000,ADC1_3:5.3-2.000000
ADC1_0:0.000,ADC1_1:-0.000,ADC1_2:2.000,ADC1_3:5.32.000000
ADC1_0:0.000,ADC1_1:0.000,ADC1_2:-2.000,ADC1_3:5.3-0.000000
ADC1_0:0.000,ADC1_1:2681562225728198300000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000000000000000
000000000000000000000000.000,ADC1_2:-0.000,ADC1_3:5.3-2.000000ADC1_0:0.000,ADC1_1:26815622257281983000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.000,ADC1_2:-0.000,ADC1_3:5.326815622257279465000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.000000[Hard fault handler]
R0 = 2000107c
R1 = 0
R2 = 0
R3 = 0
R12 = 0
LR = 800105b
PC = 30303034
PSR = 61000000
BFAR = e000ed38
CFSR = 100
HFSR = 40000000
DFSR = 0
AFSR = 0

冰是睡着的水

执行几次，打印出来的效果。。感觉是不是编译器的问题。。

冰是睡着的水

回复【2楼】正点原子:
---------------------------------
          /*  sprintf(ADC_BUFF,"ADC1_0:%5.3f,ADC1_1:%5.3f,ADC1_2:%5.3f,ADC1_3:5.3%f", //出问题。。
                              ADC_Voltage[0],ADC_Voltage[1],
                              ADC_Voltage[2],ADC_Voltage[3]); */
            sprintf(ADC_BUFF,"ADC1_0:%d.%03dV,ADC1_1:%d.%03dV,ADC1_2:%d.%03dV,ADC1_3:%d.%03dV",
                              (u8)ADC_Voltage[0],(u16)((ADC_Voltage[0]-(u8)ADC_Voltage[0])*1000),
                              (u8)ADC_Voltage[1],(u16)((ADC_Voltage[1]-(u8)ADC_Voltage[1])*1000),
                              (u8)ADC_Voltage[2],(u16)((ADC_Voltage[2]-(u8)ADC_Voltage[2])*1000),
                              (u8)ADC_Voltage[3],(u16)((ADC_Voltage[3]-(u8)ADC_Voltage[3])*1000)); 
        这样就OK了。。。编译器的问题。。。哎哎。。这样开销大啊。。
     原子哥有没有好的办法。。
     这个问题，网上都是一个迷。。哎哎

正点原子

你这个格式化好长啊...
看看是不是字节对齐的问题，adc_buf，强制为8字节对齐试试。

黑knight

可以尝试在target中不勾选use microLIB试试

手机早晚报

@正点原子
我也遇到这样的问题，对齐改了4,8位对齐都不行，扩大栈区大小程序能多跑一两轮最后还是死

正点原子

手机早晚报 发表于 2016-8-3 22:53
@正点原子
我也遇到这样的问题，对齐改了4,8位对齐都不行，扩大栈区大小程序能多跑一两轮最后还是死

试试更多字节对齐吧.