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7 years, 6 months ago.
i2c or PA_6, PA_5 pins configuration bug in NUCLEO_F031K6
Hi, guys!
The problem exists in NUCLEO_F031K6. I am using mbed-dev. If you try to work with i2c on PB_7, PB_6 pin everything OK. But if you try to declare DigitalOut on PA_6 (or PA_5) it will broke i2c (return from i2c.write & i2c.read with error). I do not know how pins PA_6 and PB_7, PB_6 is connected in mbed configuration. Please help to fix or give some advice where to search the problem roots.
bug reproduce
#include "mbed.h"
I2C i2c(PB_7, PB_6);
//if you declare DigitalOut on PA_6 pin read/write i2c operation will fail.
DigitalOut tryToBrokeI2c(PA_6);
int main() {
//!!! use your code to work with your i2c device
int address = 0x62;
char data[2];
data[0] = 0;
data[1] = 1;
if(i2c.write(address, data, 2))
printf("i2c write fail");
if(i2c.read(address, data, 2))
printf("i2c read fail");
}
1 Answer
7 years, 6 months ago.
Of course check the manual and schematic http://www.st.com/content/ccc/resource/technical/document/user_manual/e3/0e/88/05/e8/74/43/a0/DM00231744.pdf/files/DM00231744.pdf/jcr:content/translations/en.DM00231744.pdf
See pages 20 and 21. It appears PA5 and PA6 cannot be used as a digital output unless you remove bridge SB16 and SB18. Page 22 suggests you might have more luck with say, PA_4. There are no special notes for that pin.