I am working on a LPC804 with MCUXPRESSO.
I am using the Redlib (nohost -nf) - Library support with the following preprocessor defines:
I am using the printf - character by character with only interger only implementation.
It is redirected to work with a uart driver to print in a terminal. In the driver I have a software buffer of 20 bytes, and it works fine if I give it a for loop with 200 bytes, it just waits to have space to put the next byte and I can see all of them on the terminal.
If I use:
printf("Print this sequence that is longer then 20 bytes 012345678910111213141516171819\n\r");
- works just fine
printf("Print this sequence that is longer then 20 bytes")
for(uint8_t i = 0; i < 20; i++)
printf("%d, ", i);
- here some times I get HardFault or I get garbage
I saw that in the MCUXpresso_IDE_User_Guide.pdf on 15.5.1 Redlib printf Variants(page 136)
"It is possible to switch to using “character-by-character” versions of these functions (which do
not require heap space) by specifying the build define “CR_PRINTF_CHAR” (which should be
set at the project level). This can be useful, for example, if you are retargeting printf() to write
out over a UART (as detailed below)- as in this case it is pointless creating a temporary buffer to
store the whole string, only to then print it out over the UART one character at a time"
When the printf has arguments does it still uses malloc() to store the arguments?