Bitcraze Forums

Posted: **Wed Feb 04, 2015 10:51 pm**

Hello!I want to log out from quadcopter via expansion board using usart.
Function

void usart_send_char(uint8_t Data)
{
  /* Transmit Data */
	while((USART2->SR & USART_FLAG_TXE) == 0);
	USART2->DR = Data;
}

work as expected and send characters via TX2 pin on expansion board.
Now i try to implement eprintf as explained in eprintf.c file:

Code: Select all

int consolePutc(int c)
{
    usart_send_char((uint8_t)c);
    return (unsigned char)c;
}

#define consolePrintf(FMT, ...) eprintf(consolePutc, FMT, ## __VA_ARGS__)

So problem is that consolePrintf don't send correct float values. When i call:

Code: Select all

consolePrintf("%s, %d, %f\r\n", "asd", 777, 2.2 );

I get output:

Code: Select all

asd, 777, 0.0

It seems like

Code: Select all

          num = va_arg(ap, double);

always return zero.
Where i am mistaken?

Posted: **Thu Feb 05, 2015 9:02 am**

Hi,

I just tested to compile eprintf in my pc and run a test in the copter and for me it works. This is what I tested:

Code: Select all

diff --git a/modules/src/system.c b/modules/src/system.c
index 3e00801..2f01aaf 100644
--- a/modules/src/system.c
+++ b/modules/src/system.c
@@ -137,6 +137,8 @@ void systemTask(void *arg)
               *((int*)(MCU_ID_ADDRESS+8)), *((int*)(MCU_ID_ADDRESS+4)),
               *((int*)(MCU_ID_ADDRESS+0)), *((short*)(MCU_FLASH_SIZE_ADDRESS)));
 
+  DEBUG_PRINT("%s, %d, %f\r\n", "asd", 777, 2.2);
+
   commanderInit();
   stabilizerInit();
   expbrdInit();

And I got the correct thing in the console:

Code: Select all

SYS: asd, 777, 2.200000

Maybe you can try the same code to see if it works. I never saw this problem before, did you modify eprintf or maybe change the compilation option (we have not tested much the hardware floating point unit).

Bitcraze Forums

crazyflie 2.0 eprintf float values

crazyflie 2.0 eprintf float values

Re: crazyflie 2.0 eprintf float values