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How to Properly Implement printf?
2019 Community Moderator ElectionFreeRTOS queues for IO before scheduler starts (or after it stops)Looking for a pure c-version of math.h functions (no co-processor support)Porting newlib to a custom ARM setupnewlib printf function bugNewlib printf delaySTM32 hard faults when trying to printf numbers >= 10Newlib's Malloc is “ignoring” a whole bunch of free memoryHow to make printf work on STM32F103?printf in newlib is not working in baremetal ARM environmentUsing LTO with arm-none-eabi and newlib-nano
I've spent the good portion of the last 10 hours trying to wrap my head around printf and how it's supposed to be properly implemented and I need some assistance.
First off I would like to inform you that I am using printf from newlib. Whether there is another library out there that provides a variant of printf, I do not know, but just in case, this is where I am getting printf from.
I want to understand how printf is supposed to work in an embedded environment. For example, I now know that printf will print a string of characters to the STDOUT. Here is my first question:
What is considered STDOUT in an embedded system (MCU)?
Will printf do nothing until I tell printf where to send the string of characters? According to different articles and forums, I am apparently supposed to use the function _write to redirect the formatted output from printf.
If I am supposed to use _write to redirect printf, then why doesn't the newlib documentation explain how to properly use printf? Because I cannot find anywhere in the newlib documentation where it says that printf will not do anything until you implement _write.
newlib
asked 23 mins ago
cDreamercDreamer
759
add a comment |
I've spent the good portion of the last 10 hours trying to wrap my head around printf and how it's supposed to be properly implemented and I need some assistance.
First off I would like to inform you that I am using printf from newlib. Whether there is another library out there that provides a variant of printf, I do not know, but just in case, this is where I am getting printf from.
I want to understand how printf is supposed to work in an embedded environment. For example, I now know that printf will print a string of characters to the STDOUT. Here is my first question:
What is considered STDOUT in an embedded system (MCU)?
Will printf do nothing until I tell printf where to send the string of characters? According to different articles and forums, I am apparently supposed to use the function _write to redirect the formatted output from printf.
If I am supposed to use _write to redirect printf, then why doesn't the newlib documentation explain how to properly use printf? Because I cannot find anywhere in the newlib documentation where it says that printf will not do anything until you implement _write.
newlib
asked 23 mins ago
cDreamercDreamer
759
add a comment |
I've spent the good portion of the last 10 hours trying to wrap my head around printf and how it's supposed to be properly implemented and I need some assistance.
First off I would like to inform you that I am using printf from newlib. Whether there is another library out there that provides a variant of printf, I do not know, but just in case, this is where I am getting printf from.
I want to understand how printf is supposed to work in an embedded environment. For example, I now know that printf will print a string of characters to the STDOUT. Here is my first question:
What is considered STDOUT in an embedded system (MCU)?
Will printf do nothing until I tell printf where to send the string of characters? According to different articles and forums, I am apparently supposed to use the function _write to redirect the formatted output from printf.
If I am supposed to use _write to redirect printf, then why doesn't the newlib documentation explain how to properly use printf? Because I cannot find anywhere in the newlib documentation where it says that printf will not do anything until you implement _write.
newlib
asked 23 mins ago
cDreamercDreamer
759
I've spent the good portion of the last 10 hours trying to wrap my head around printf and how it's supposed to be properly implemented and I need some assistance.
First off I would like to inform you that I am using printf from newlib. Whether there is another library out there that provides a variant of printf, I do not know, but just in case, this is where I am getting printf from.
I want to understand how printf is supposed to work in an embedded environment. For example, I now know that printf will print a string of characters to the STDOUT. Here is my first question:
What is considered STDOUT in an embedded system (MCU)?
Will printf do nothing until I tell printf where to send the string of characters? According to different articles and forums, I am apparently supposed to use the function _write to redirect the formatted output from printf.
If I am supposed to use _write to redirect printf, then why doesn't the newlib documentation explain how to properly use printf? Because I cannot find anywhere in the newlib documentation where it says that printf will not do anything until you implement _write.
newlib
newlib
asked 23 mins ago
cDreamercDreamer
759
asked 23 mins ago
cDreamercDreamer
759
asked 23 mins ago
cDreamercDreamer
759
asked 23 mins ago
cDreamercDreamer
759
asked 23 mins ago
cDreamercDreamer
759
759
add a comment |
add a comment |
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