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6 years, 5 months ago.
STM32L073 Problems Using SPI
Hello,
This is my first post in the forum. I hope it makes sense.
It has become evident that when I try to use the SPI function in the target NUCLEO-L073RZ there is a conflict that is not capture in the compiler. I have the blink sample project and then added only the SPI declaration, having done that, the LED blink stops working. please see below the code:
#include "mbed.h"
DigitalOut led1(LED1);
//Uncomment any of the following two lines and the program will crash
//SPI spi( SPI_MOSI, SPI_MISO, SPI_SCK );
//SPI spi( PA_7, PA_6, PA_5 );
Serial pc(USBTX, USBRX);
int main() {
while (1) {
led1 = !led1;
wait(0.5);
}
}
Thanks!
1 Answer
6 years, 5 months ago.
Please use <<code>> and <</code>> tags on separate lines around your posted code to keep it readable.
See the board documentation here. That shows that the LED1 is on the same pin as PA_5 SPI_SCLK and thus there is a conflict with the DigitalOut(LED1) declaration . This should have been documented more clearly. You can solve that by using another pin for SPI_SCLK (ie PB_3).
Removing the DigitalOut for the LED1 may not work. Some reports say that the SCLK signal level on PA_5 is too low when the LED is mounted and communications fail. You can only solve that by disconnecting the LED.