practic_les7_c_spi2_tx_dma

WeAct BlackPill STM32F411CEU6 HSI= 16MHz SPI2 - Send packet data DMA1 Stream4 Channel 0 - RM0383 page 170 * GPIOB Pin13 -> SCK * GPIOB Pin14 -> MISO * GPIOB Pin15 -> MOSI