Help implementing SPI using just registers Hello everyone,I am having trouble communicating with CC1101 radio SPI slave. With HAL, the transfers work well and I am able to read every register, but because I am using stm32f042 MCU, I'm low on flash memory because I'm also using USB CDC. So I'm trying to control the SPI1 peripheral using it's registers. Here is the code for the transfer and the init:void SPI1_Init(void) { /* full duplex master, 8 bit transfer, default phase and polarity */ SPI1->CR1 = SPI_CR1_MSTR | SPI_CR1_SPE | SPI_CR1_SSM | SPI_CR1_SSI; /* Disable receive FIFO*/ SPI1->CR2 = SPI_CR2_FRXTH;}void SPI1_Transfer(uint8_t *outp, uint8_t *inp, int count) { while(count--) { while(!(SPI1->SR & SPI_SR_TXE)) ; *(volatile uint8_t *)&SPI1->DR = *outp++; while(!(SPI1->SR & SPI_SR_RXNE)) ; *inp++ = *(volatile uint8_t *)&SPI1->DR; }} The problem is that it gets stuck on the while(!(SPI1->SR & SPI_SR_TXE)) loop. It seems the TXE flag is never set. I also have initialized MISO, MOSI
