UART function Error in D2000

[BMist2]

Hi,

I am trying this two functions (line 6 and 7) and both gave different results!

# define MyString ("AT\r\n")

.

.

.

qm_uart_write_buffer(QM_UART_0, (uint8_t *)MyString, sizeof(MyString));

QM_PRINTF("AT\r\n");

qm_uart_write_buffer(QM_UART_0, (uint8_t *)aString, sizeof(aString)); output : AT\r\n0

while QM_PRINTF("AT\r\n"); output : AT\r\n

FYI, I have used QM_UART_LC_8N1 = 0x03, /**< 8 data bits, no parity, 1 stop bit */ for Configuration. And there shouldn't be additional 0 at the end.

Wasted few hours debugging hardware while apparently it was software error!!

[MuhamadSof_B_Intel]

Hi ByteMaster,

I tried to reproduce back your issue but it seem like there no issue on my machine. Could you try to repair/reinstall back the ISSM 2016 to see if the issue still persist. If yes, please help to provide more details on the setup to reproduce back the issue.

Thanks.

Soffi

[BMist2]

Hi Soffi,

Try with Logic analyzer or oscilloscope..it appears in there.

Thanks

[Michelle_C_Intel]

Hi ,

It seems you are also seeing the null character that marks the end of the string -- Do you see the same issue is you use strlen rather than sizeof to calculate the length ?

It seems ok for me ..

# include

# include

# include

# define MyString ("AT\r\n")

int main(void)

{

qm_uart_write_buffer(QM_UART_0, (uint8_t *)MyString, strlen(MyString));

QM_PRINTF("AT\r\n");

return 0;

}

regards,

Michelle.

[BMist2]

Hi Michelle,

This make sense.

it works with strlen instead of sizeof

Please check the output of this three lines in attached pic.

qm_uart_write_buffer(QM_UART_0, (uint8_t *)MyString, sizeof(MyString)); /* Send "AT\r\n" */

qm_uart_write_buffer(QM_UART_0, (uint8_t *)MyString, strlen(MyString)); /* Send "AT\r\n" */

QM_PRINTF("AT\r\n"); /* Print "AT\r\n" */