I used SPI. 8 bit. HCLK / PCLK1 / PCLK2 is 1 MHz from HSI. I've run the standard code many times:SPI->CR1 = 0;
SPI->CR1 = (0x7 << 3) | (1u << 2);
SPI->CR2 = (1 << 2); // Without OVR.
SPI->CR1 |= 1 << 6; // Enable.It worked. Many launches after tha...
