SPI driven 74595 shift register produces random output Hi folks,For the past 2 days, i tried to setup a simple SPI communication to feed a shift register with 7-segment data.I already have done this in the arduino IDE, using shiftOut.Now I want to make this more elegant with the CubeIDE. I set up an SPI1 and connected it to the SER input. Clk also connected to SPI Clk. I habe even a separate GPIO pin for the shift register latch SRCLK.Here is some code (it should count from 0-9, the segment data is in the digArray): spiBuffer[0] = digArray[count++];
if (count==10) {
count=0;
}
HAL_GPIO_WritePin(SRCLK_GPIO_Port, SRCLK_Pin, GPIO_PIN_RESET);
HAL_SPI_Transmit(&hspi1, spiBuffer, 1, 10);
HAL_GPIO_WritePin(SRCLK_GPIO_Port, SRCLK_Pin, GPIO_PIN_SET); The thing is, the 7-segment displays almost always random ***. I measured every signal with oscilloscope.The SPI is setup with MSB first which is like in my Arduino program. I struggle with the clock (I think it should have some "delay" and we need a rising edge). I set polarity l
