hide deprecated code; make USB snippet common for F0/F1/F3

F1:F103/deprecated/PL2303/main.c

@@ -0,0 +1,172 @@
+/*
+ * main.c
+ *
+ * Copyright 2017 Edward V. Emelianoff <eddy@sao.ru, 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 2 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#include "hardware.h"
+#include "usart.h"
+#include "usb.h"
+#include "usb_lib.h"
+
+volatile uint32_t Tms = 0;
+
+/* Called when systick fires */
+void sys_tick_handler(void){
+    ++Tms;
+}
+
+void iwdg_setup(){
+    uint32_t tmout = 16000000;
+    /* Enable the peripheral clock RTC */
+    /* (1) Enable the LSI (40kHz) */
+    /* (2) Wait while it is not ready */
+    RCC->CSR |= RCC_CSR_LSION; /* (1) */
+    while((RCC->CSR & RCC_CSR_LSIRDY) != RCC_CSR_LSIRDY){if(--tmout == 0) break;} /* (2) */
+    /* Configure IWDG */
+    /* (1) Activate IWDG (not needed if done in option bytes) */
+    /* (2) Enable write access to IWDG registers */
+    /* (3) Set prescaler by 64 (1.6ms for each tick) */
+    /* (4) Set reload value to have a rollover each 2s */
+    /* (5) Check if flags are reset */
+    /* (6) Refresh counter */
+    IWDG->KR = IWDG_START; /* (1) */
+    IWDG->KR = IWDG_WRITE_ACCESS; /* (2) */
+    IWDG->PR = IWDG_PR_PR_1; /* (3) */
+    IWDG->RLR = 1250; /* (4) */
+    tmout = 16000000;
+    while(IWDG->SR){if(--tmout == 0) break;} /* (5) */
+    IWDG->KR = IWDG_REFRESH; /* (6) */
+}
+
+#define USND(str)  do{USB_send((uint8_t*)str, sizeof(str)-1);}while(0)
+static const char *parse_cmd(const char *buf){
+    if(buf[1] != '\n') return buf;
+    switch(*buf){
+        case 'p':
+            pin_toggle(USBPU_port, USBPU_pin);
+            USND("USB pullup is ");
+            if(pin_read(USBPU_port, USBPU_pin)) USND("off\n");
+            else USND("on\n");
+            return NULL;
+        break;
+        case 'L':
+            USND("Very long test string for USB (it's length is more than 64 bytes).\n"
+                     "This is another part of the string! Can you see all of this?\n");
+            return "OK\n";
+        break;
+        case 'R':
+            USND("Soft reset\n");
+            NVIC_SystemReset();
+        break;
+        case 'S':
+            USND("Test string for USB\n");
+            return "OK\n";
+        break;
+        case 'W':
+            USND("Wait for reboot\n");
+            while(1){nop();};
+        break;
+        default: // help
+            return
+            "'p' - toggle USB pullup\n"
+            "'L' - send long string over USB\n"
+            "'R' - software reset\n"
+            "'S' - send short string over USB\n"
+            "'W' - test watchdog\n"
+            ;
+        break;
+    }
+    return NULL;
+}
+
+// usb getline
+char *get_USB(){
+    static char tmpbuf[512], *curptr = tmpbuf;
+    static int rest = 511;
+    uint8_t x = USB_receive((uint8_t*)curptr);
+    curptr[x] = 0;
+    if(!x) return NULL;
+    if(curptr[x-1] == '\n'){
+#ifdef EBUG
+        DBG("fullline");
+        IWDG->KR = IWDG_REFRESH;
+        SEND(tmpbuf);
+        transmit_tbuf();
+#endif
+        curptr = tmpbuf;
+        rest = 511;
+        return tmpbuf;
+    }
+    curptr += x; rest -= x;
+    if(rest <= 0){ // buffer overflow
+        curptr = tmpbuf;
+        rest = 511;
+    }
+    return NULL;
+}
+
+int main(void){
+    uint32_t lastT = 0;
+    sysreset();
+    StartHSE();
+    hw_setup();
+    SysTick_Config(72000);
+
+    usart_setup();
+    DBG("Start");
+    if(RCC->CSR & RCC_CSR_IWDGRSTF){ // watchdog reset occured
+        SEND("WDGRESET=1"); newline();
+    }
+    if(RCC->CSR & RCC_CSR_SFTRSTF){ // software reset occured
+        SEND("SOFTRESET=1"); newline();
+    }
+    RCC->CSR |= RCC_CSR_RMVF; // remove reset flags
+
+    USBPU_OFF();
+    USB_setup();
+    iwdg_setup();
+    USBPU_ON();
+
+    while (1){
+        IWDG->KR = IWDG_REFRESH; // refresh watchdog
+        if(lastT > Tms || Tms - lastT > 499){
+            LED_blink(LED0);
+            lastT = Tms;
+            USND("tick\n");
+            transmit_tbuf();
+        }
+        usb_proc();
+        char *txt, *ans;
+        if((txt = get_USB())){
+            IWDG->KR = IWDG_REFRESH;
+#ifdef EBUG
+            SEND("Got data: ");
+            SEND(txt); newline();
+            transmit_tbuf();
+#endif
+            ans = (char*)parse_cmd(txt);
+            if(ans){
+                uint16_t l = 0; char *p = ans;
+                while(*p++) l++;
+                USB_send((uint8_t*)ans, l);
+            }
+        }
+    }
+    return 0;
+}