const char [] and char[] difference question

[focusdoit]

Hi, I wrote a small c program on a microcontroller, 32bit. I met a weird problem. I wrote code like:

const char strtest[] = "Test123\r\n"; //Global
UART_print(strtest); //in a loop

the output is fine, I can see the output on Teraterm(RS232 interface tool), like: Test123 Test123 .. But when I try code:

char str123[] = "Test123\r\n"; //Global
UART_print(strtest); //in a loop

The output is only the first element: TTTTTTTT Any hint is appreciated.

[David Crow]

focusdoit wrote:

char str123[] = "Test123\r\n"; //Global UART_print(strtest); //in a loop

Where is str123 used? What is the signature of UART_print()?

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[Lost User]

Please show the code for the UART_print function.

[Victor Nijegorodov]

focusdoit wrote:

But when I try code:

char str123[] = "Test123\r\n"; //Global
UART_print(strtest); //in a loop

You defined the variable str123 but you print the strtest. Where and how is this strtest defined?

[samzcs]

It's memory allocation problem. the MCU has 2 cpu inside, and one set of peripheral units, compiler put str123 in DMA Access prohibited area. Embedded programming, too many tricks. :)