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F3:F303/BME280/proto.c

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+/*
+ * This file is part of the bme280 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/>.
+ */
+
+#include <stm32f3.h>
+#include <string.h>
+
+#include "spi.h"
+#include "strfunc.h"
+#include "usb_dev.h"
+#include "version.inc"
+
+#define LOCBUFFSZ       (32)
+// local buffer for SPI data to send
+static uint8_t locBuffer[LOCBUFFSZ];
+static const char *ERR = "ERR\n", *OK = "OK\n";
+extern volatile uint32_t Tms;
+
+const char *helpstring =
+        "https://github.com/eddyem/stm32samples/tree/master/F3:F303/xxx build#" BUILD_NUMBER " @ " BUILD_DATE "\n"
+        "i - [re]init SPI1\n"
+        "s - send up to 32 bytes of data and read answer\n"
+        "T - print current Tms\n"
+;
+
+// read N numbers from buf, @return 0 if wrong or none
+TRUE_INLINE uint16_t readNnumbers(const char *buf){
+    uint32_t D;
+    const char *nxt;
+    uint16_t N = 0;
+    while((nxt = getnum(buf, &D)) && nxt != buf && N < LOCBUFFSZ){
+        if(D > 0xff){ USND("Each number should be uint8_t"); return 0; }
+        buf = nxt;
+        locBuffer[N++] = (uint8_t) D&0xff;
+        USND("add byte: "); USND(uhex2str(D&0xff)); USND("\n");
+    }
+    USND("Send "); USND(u2str(N)); USND(" bytes\n");
+    return N;
+}
+
+TRUE_INLINE const char* spirdwr(const char *buf){
+    if(spi_status != SPI_READY){ USND("SPI not ready!"); return NULL; }
+    uint16_t got = readNnumbers(buf);
+    if(got < 1){ USND("Enter at least one uint8_t"); return NULL; }
+    if(!spi_writeread(locBuffer, got)) return ERR;
+    USND("Read data:");
+    hexdump(USB_sendstr, locBuffer, got);
+    return NULL;
+}
+
+const char *parse_cmd(const char *buf){
+    // "long" commands
+    if(buf[1]){
+        char c = *buf++;
+        switch(c){
+            case 's':
+                return spirdwr(buf);
+            default: return buf; // echo input
+        }
+    }
+  /*  switch(*buf){
+        case '':
+        break;
+    }*/
+    // "short" commands
+    switch(*buf){
+        case 'i':
+            spi_setup();
+            return OK;
+        case 'T':
+            USB_sendstr("T=");
+            USB_sendstr(u2str(Tms));
+            newline();
+        break;
+        default: // help
+            USB_sendstr(helpstring);
+        break;
+    }
+    return NULL;
+}