copy InterfaceBoard as 7CDCs template

F3:F303/Seven_CDCs.deprecated/usb.c

@@ -0,0 +1,129 @@
+/*
+ * This file is part of the SevenCDCs project.
+ * Copyright 2023 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/>.
+ */
+
+#include <string.h>
+
+#include "hardware.h"
+#include "strfunc.h"
+#include "usb.h"
+#include "usb_lib.h"
+
+static volatile uint8_t usbbuff[USB_TXBUFSZ]; // temporary buffer for sending data
+// ring buffers for incoming and outgoing data
+static uint8_t obuf[MAX_IDX][RBOUTSZ], ibuf[MAX_IDX][RBINSZ];
+#define OBUF(N)  {.data = obuf[N], .length = RBOUTSZ, .head = 0, .tail = 0}
+volatile ringbuffer rbout[MAX_IDX] = {OBUF(0), OBUF(1), OBUF(2), OBUF(3), OBUF(4), OBUF(5), OBUF(6)};
+#define IBUF(N)  {.data = ibuf[N], .length = RBINSZ, .head = 0, .tail = 0}
+volatile ringbuffer rbin[MAX_IDX] = {IBUF(0), IBUF(1), IBUF(2), IBUF(3), IBUF(4), IBUF(5), IBUF(6)};
+// transmission is succesfull
+volatile uint8_t bufisempty[MAX_IDX] = {1,1,1,1,1,1,1};
+volatile uint8_t bufovrfl[MAX_IDX] = {0};
+
+// here and later: ifNo is index of buffers, i.e. ifNo = epno-1 !!!
+void send_next(int ifNo){
+    if(bufisempty[ifNo]) return;
+    static uint8_t lastdsz[MAX_EPNO] = {0};
+    int buflen = RB_read((ringbuffer*)&rbout[ifNo], (uint8_t*)usbbuff, USB_TXBUFSZ);
+    if(!buflen){
+        if(lastdsz[ifNo] == USB_TXBUFSZ) EP_Write(ifNo+1, NULL, 0); // send ZLP after 64 bits packet when nothing more to send
+        lastdsz[ifNo] = 0;
+        bufisempty[ifNo] = 1;
+        return;
+    }
+    EP_Write(ifNo+1, (uint8_t*)usbbuff, buflen);
+    lastdsz[ifNo] = buflen;
+}
+
+// blocking send full content of ring buffer
+int USB_sendall(int ifNo){
+    while(!bufisempty[ifNo]){
+        if(!USBON(ifNo)) return 0;
+    }
+    return 1;
+}
+
+// put `buf` into queue to send
+int USB_send(int ifNo, const uint8_t *buf, int len){
+    if(!buf || !USBON(ifNo) || !len) return 0;
+    uint32_t T = Tms;
+    while(len){
+        int a = RB_write((ringbuffer*)&rbout[ifNo], buf, len);
+        if(a == 0 && Tms - T > 5){ // buffer overflow && timeout -> interface disconnected
+            usbON &= ~(1<<ifNo);
+            bufisempty[ifNo] = 0;
+            RB_clearbuf((ringbuffer*)&rbout[ifNo]);
+            return 0; // timeout - interface is down
+        }
+        len -= a;
+        buf += a;
+        if(bufisempty[ifNo]){
+            bufisempty[ifNo] = 0;
+            send_next(ifNo);
+        }
+    }
+    return 1;
+}
+
+int USB_putbyte(int ifNo, uint8_t byte){
+    if(!USBON(ifNo)) return 0;
+    while(0 == RB_write((ringbuffer*)&rbout[ifNo], &byte, 1)) send_next(ifNo);
+    if(bufisempty[ifNo]){
+        bufisempty[ifNo] = 0;
+        send_next(ifNo);
+    }
+    return 1;
+}
+
+int USB_sendstr(int ifNo, const char *string){
+    if(!string) return 0;
+    return USB_send(ifNo, (const uint8_t*)string, mystrlen(string));
+}
+
+/**
+ * @brief USB_receive - get binary data from receiving ring-buffer
+ * @param buf (i) - buffer for received data
+ * @param len - length of `buf`
+ * @return amount of received bytes (negative, if overfull happened)
+ */
+int USB_receive(int ifNo, uint8_t *buf, int len){
+    if(bufovrfl[ifNo]){
+        RB_clearbuf((ringbuffer*)&rbin[ifNo]);
+        bufovrfl[ifNo] = 0;
+        return -1;
+    }
+    int sz = RB_read((ringbuffer*)&rbin[ifNo], buf, len);
+    return sz;
+}
+
+/**
+ * @brief USB_receivestr - get string up to '\n' and replace '\n' with 0
+ * @param buf - receiving buffer
+ * @param len - its length
+ * @return strlen or negative value indicating overflow (if so, string won't be ends with 0 and buffer should be cleared)
+ */
+int USB_receivestr(int ifNo, char *buf, int len){
+    if(bufovrfl[ifNo]){
+        RB_clearbuf((ringbuffer*)&rbin[ifNo]);
+        bufovrfl[ifNo] = 0;
+        return -1;
+    }
+    int l = RB_readto((ringbuffer*)&rbin[ifNo], '\n', (uint8_t*)buf, len);
+    if(l < 1) return 0;
+    buf[--l] = 0; // replace '\n' with strend
+    return l;
+}