test USART with ringbuffer - OK; TODO: rewrite all proto for usage USB & USART

F3:F303/MLX90640-allsky/usart.h

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+/*
+ * This file is part of the ir-allsky project.
+ * Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "hardware.h"
+
+// timeout of TXrdy waiting
+#define RXRDY_TMOUT     (100)
+// DMA transmission and reception buffers' size
+#define UARTBUFSZI  (128)
+#define UARTBUFSZO  (256)
+// and circular buffer for big transmissions - 5k
+#define DMARBSZ     (5120)
+
+int usart_ovr(); // RX overfull occured
+void usart_process(); // send next data portion
+int usart_setup(uint32_t speed); // set USART1 with given speed
+char *usart_getline(int *len); // read from rbin to buf
+int usart_sendstr(const char *str);
+int usart_putchar(const char ch);
+void usart_stop();