此帖出自微控制器 MCU论坛
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之所以不能用,其实这个函数是由以下函数写的,把下面的函数所在的文件链接进去就可以用了
void
UARTprintf(const char *pcString, ...)
{
va_list vaArgP;
//
// Start the varargs processing.
//
va_start(vaArgP, pcString);
UARTvprintf(pcString, vaArgP);
//
// We're finished with the varargs now.
//
va_end(vaArgP);
}
void
UARTvprintf(const char *pcString, va_list vaArgP)
{
uint32_t ui32Idx, ui32Value, ui32Pos, ui32Count, ui32Base, ui32Neg;
char *pcStr, pcBuf[16], cFill;
//
// Check the arguments.
//
ASSERT(pcString != 0);
//
// Loop while there are more characters in the string.
//
while(*pcString)
{
//
// Find the first non-% character, or the end of the string.
//
for(ui32Idx = 0;
(pcString[ui32Idx] != '%') && (pcString[ui32Idx] != '\0');
ui32Idx++)
{
}
//
// Write this portion of the string.
//
UARTwrite(pcString, ui32Idx);
//
// Skip the portion of the string that was written.
//
pcString += ui32Idx;
//
// See if the next character is a %.
//
if(*pcString == '%')
{
//
// Skip the %.
//
pcString++;
//
// Set the digit count to zero, and the fill character to space
// (in other words, to the defaults).
//
ui32Count = 0;
cFill = ' ';
//
// It may be necessary to get back here to process more characters.
// Goto's aren't pretty, but effective. I feel extremely dirty for
// using not one but two of the beasts.
//
again:
//
// Determine how to handle the next character.
//
switch(*pcString++)
{
//
// Handle the digit characters.
//
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
{
//
// If this is a zero, and it is the first digit, then the
// fill character is a zero instead of a space.
//
if((pcString[-1] == '0') && (ui32Count == 0))
{
cFill = '0';
}
//
// Update the digit count.
//
ui32Count *= 10;
ui32Count += pcString[-1] - '0';
//
// Get the next character.
//
goto again;
}
//
// Handle the %c command.
//
case 'c':
{
//
// Get the value from the varargs.
//
ui32Value = va_arg(vaArgP, uint32_t);
//
// Print out the character.
//
UARTwrite((char *)&ui32Value, 1);
//
// This command has been handled.
//
break;
}
//
// Handle the %d and %i commands.
//
case 'd':
case 'i':
{
//
// Get the value from the varargs.
//
ui32Value = va_arg(vaArgP, uint32_t);
//
// Reset the buffer position.
//
ui32Pos = 0;
//
// If the value is negative, make it positive and indicate
// that a minus sign is needed.
//
if((int32_t)ui32Value < 0)
{
//
// Make the value positive.
//
ui32Value = -(int32_t)ui32Value;
//
// Indicate that the value is negative.
//
ui32Neg = 1;
}
else
{
//
// Indicate that the value is positive so that a minus
// sign isn't inserted.
//
ui32Neg = 0;
}
//
// Set the base to 10.
//
ui32Base = 10;
//
// Convert the value to ASCII.
//
goto convert;
}
//
// Handle the %s command.
//
case 's':
{
//
// Get the string pointer from the varargs.
//
pcStr = va_arg(vaArgP, char *);
//
// Determine the length of the string.
//
for(ui32Idx = 0; pcStr[ui32Idx] != '\0'; ui32Idx++)
{
}
//
// Write the string.
//
UARTwrite(pcStr, ui32Idx);
//
// Write any required padding spaces
//
if(ui32Count > ui32Idx)
{
ui32Count -= ui32Idx;
while(ui32Count--)
{
UARTwrite(" ", 1);
}
}
//
// This command has been handled.
//
break;
}
//
// Handle the %u command.
//
case 'u':
{
//
// Get the value from the varargs.
//
ui32Value = va_arg(vaArgP, uint32_t);
//
// Reset the buffer position.
//
ui32Pos = 0;
//
// Set the base to 10.
//
ui32Base = 10;
//
// Indicate that the value is positive so that a minus sign
// isn't inserted.
//
ui32Neg = 0;
//
// Convert the value to ASCII.
//
goto convert;
}
//
// Handle the %x and %X commands. Note that they are treated
// identically; in other words, %X will use lower case letters
// for a-f instead of the upper case letters it should use. We
// also alias %p to %x.
//
case 'x':
case 'X':
case 'p':
{
//
// Get the value from the varargs.
//
ui32Value = va_arg(vaArgP, uint32_t);
//
// Reset the buffer position.
//
ui32Pos = 0;
//
// Set the base to 16.
//
ui32Base = 16;
//
// Indicate that the value is positive so that a minus sign
// isn't inserted.
//
ui32Neg = 0;
//
// Determine the number of digits in the string version of
// the value.
//
convert:
for(ui32Idx = 1;
(((ui32Idx * ui32Base) 1) && (ui32Count < 16))
{
for(ui32Count--; ui32Count; ui32Count--)
{
pcBuf[ui32Pos++] = cFill;
}
}
//
// If the value is negative, then place the minus sign
// before the number.
//
if(ui32Neg)
{
//
// Place the minus sign in the output buffer.
//
pcBuf[ui32Pos++] = '-';
}
//
// Convert the value into a string.
//
for(; ui32Idx; ui32Idx /= ui32Base)
{
pcBuf[ui32Pos++] =
g_pcHex[(ui32Value / ui32Idx) % ui32Base];
}
//
// Write the string.
//
UARTwrite(pcBuf, ui32Pos);
//
// This command has been handled.
//
break;
}
//
// Handle the %% command.
//
case '%':
{
//
// Simply write a single %.
//
UARTwrite(pcString - 1, 1);
//
// This command has been handled.
//
break;
}
//
// Handle all other commands.
//
default:
{
//
// Indicate an error.
//
UARTwrite("ERROR", 5);
//
// This command has been handled.
//
break;
}
}
}
}
}
都在uartstdio.c里面
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回复
发表于 2014-11-18 17:32
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此帖出自微控制器 MCU论坛
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此帖出自微控制器 MCU论坛
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个人签名奋斗
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此帖出自微控制器 MCU论坛
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此帖出自微控制器 MCU论坛
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此帖出自微控制器 MCU论坛
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此帖出自微控制器 MCU论坛
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此帖出自微控制器 MCU论坛
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