demo of driving MAX2719 dot matrix displays with STM32F103 Bluepill
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f103-dotmatrix/project/com/iface_usart.h

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#pragma once
#include "main.h"
#include "com_iface.h"
// Hardware USART.
/**
* @brief Init an USART interface. Caller must configure GPIO's & AF manually.
* @param USARTx device
* @param baud baud rate (ex.: 9600)
* @param rxbuf_len receive buffer size, must be > 0
* @param txbuf_len send buffer size. If 0, tx is blocking.
* @return the iface structure
*/
ComIface *usart_iface_init(USART_TypeDef* USARTx, uint32_t baud, size_t rxbuf_len, size_t txbuf_len);
///** Set baud rate */
//void usart_iface_set_baudrate(ComIface *iface, uint32_t baud);