crazyflie 2.0 eprintf float values

[almaz_1c]

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

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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:

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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:

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

I get output:

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asd, 777, 0.0

It seems like

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          num = va_arg(ap, double);

always return zero.
Where i am mistaken?

[arnaud]

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:

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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:

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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).