add a prompt and command processing stub

cdc_acm_usb_interface.c

@@ -180,11 +180,8 @@ USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t debug_buffer[BUFFER_SIZE];
 volatile bool ep_tx_busy_flag = false;
 volatile bool ep_dbg_tx_busy_flag = false;
 
-// TODO: Remove these. Debugging only
-volatile uint8_t debug_val_1 = 0;
-volatile uint8_t debug_val_2 = 0;
-volatile uint32_t debug_val32_1 = 0;
-volatile uint32_t debug_val32_2 = 0;
+void (*data_received_ptr)(uint32_t, uint8_t *) = NULL;
+void (*dtr_changed_ptr)(bool);
 
 #ifdef CONFIG_USB_HS
 #define CDC_MAX_MPS 512
@@ -203,17 +200,17 @@ void usbd_configure_done_callback(void)
 
 void usbd_cdc_acm_bulk_out(uint8_t ep, uint32_t nbytes)
 {
-  debug_val_1 = ep; debug_val32_1 = nbytes;
   USB_LOG_RAW("actual out len:%d\r\n", nbytes);
   debuglog("Bytes received from host. actual out len:%d\r\n", nbytes);
 
+  if (data_received_ptr != NULL) (*data_received_ptr)(nbytes, read_buffer);
+
   /* setup next out ep read transfer */
   usbd_ep_start_read(ep, read_buffer, BUFFER_SIZE);
 }
 
 void usbd_cdc_acm_bulk_in(uint8_t ep, uint32_t nbytes)
 {
-  debug_val_2 = ep; debug_val32_2 = nbytes;
   USB_LOG_RAW("actual in len:%d\r\n", nbytes);
 
   if ((nbytes % CDC_MAX_MPS) == 0 && nbytes) {
@@ -287,13 +284,17 @@ void usbd_cdc_acm_set_dtr(uint8_t intf, bool dtr)
 {
   /* Based on above init, intf = 0 is normal, intf = 2 is debug */
   if (dtr) {
+    debuglog("Data terminal ready (DTR enabled) on intf: %d\r\n", intf);
     if (intf == 0) {
       dtr_enable = 1;
+      if (dtr_changed_ptr != NULL) { (*dtr_changed_ptr)(dtr); }
     } else {
       dtr_dbg_enable = 1;
     }
   } else {
+    debuglog("DTR disabled on intf: %d\r\n", intf);
     if (intf == 0) {
+      if (dtr_changed_ptr != NULL) { (*dtr_changed_ptr)(dtr); }
       dtr_enable = 0;
     } else {
       dtr_dbg_enable = 0;
@@ -347,7 +348,6 @@ void nprintf(uint8_t lvl, const uint8_t ep,  const char *fmt, va_list ap) {
   } else {
     buffer = &debug_buffer[0];
     ep_dbg_tx_busy_flag = true;
-    // TODO: Add debug prefix to buffer here...
   }
   int len = prefix(ep == CDC_IN_DBG_EP, lvl, buffer);
   len += vsnprintf(
@@ -358,6 +358,19 @@ void nprintf(uint8_t lvl, const uint8_t ep,  const char *fmt, va_list ap) {
     );
   len = suffix(ep == CDC_IN_DBG_EP, lvl, buffer, len);
   usbd_ep_start_write(ep, buffer, len);
+  if (ep == CDC_IN_EP) {
+    //while (ep_tx_busy_flag) {}
+  }else {
+    //while (ep_dbg_tx_busy_flag) {}
+  }
+}
+
+void raw_output(size_t len, uint8_t *data) {
+  if (!dtr_enable) return;
+
+  ep_tx_busy_flag = true;
+  usbd_ep_start_write(CDC_IN_EP, data, len);
+  //while (ep_dbg_tx_busy_flag) {}
 }
 
 void output(const char *fmt, ...) {

main.c

@@ -10,27 +10,85 @@ extern void output(const char *, ...);
 extern void debuglog(const char *, ...);
 extern void debugwarn(const char *, ...);
 extern void debugerror(const char *, ...);
+extern void (*dtr_changed_ptr)(bool);
+extern void (*data_received_ptr)(uint32_t, uint8_t *);
+extern void raw_output(size_t, uint8_t *);
 
 uint32_t buffer_init(char *);
 
-USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t write_buffer_main[2048];
+char *prompt = "C:\\> ";
 
-int main(void)
-{
-  board_init();
+USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t cmd_buffer[1024];
+volatile bool display_prompt = false;
+volatile uint32_t curr_char = 0;
 
-  uint32_t inx = 0;
-  cdc_acm_init();
-  debuglog("Initialized"); 
-  while (1) {
-    if (inx++ >= 2000){
-      output("Hello world\r\n");
-      debuglog("Hello to debuggers!\r\n");
-      debugwarn("Warning to debuggers!\r\n");
-      debugerror("Oh no - an error!\r\n");
-      inx = 0;
-    }
-    bflb_mtimer_delay_ms(1);
+void process_cmd(uint8_t *cmd, uint32_t cmd_len){
+  int prefix_len = strlen("echo ");
+  if (strncmp((char *)cmd, "echo ", prefix_len) == 0){
+    raw_output(cmd_len - prefix_len + 1, cmd + prefix_len);
+    bflb_mtimer_delay_ms(1); /* There is a microsecond delay as well */
+    output("\r\n");
+    return;
+  }
+}
+
+void data_received(uint32_t nbytes, uint8_t *bytes) {
+  /* I think we're getting an SOH after our output, but not sure why exactly */
+  /* This if statement is a bit fragile (e.g. it doesn't cover SOH + data) */
+  /* so we may need some further processing */
+  if (curr_char == 0 && nbytes == 1 && *bytes == 0x01) return;
+  /* if (nbytes == 1) */
+  /*   debuglog("Received the letter '%c'. curr_char %d\r\n", *bytes, curr_char); */
+  if (curr_char + nbytes >= 1024) {
+    /* We will overflow - bail */
+    debugerror("command too long");
+    output("\r\nCOMMAND TOO LONG\r\n%s", prompt);
+    curr_char = 0;
+    return;
+  }
+  /* Process new data */
+  memcpy(&cmd_buffer[curr_char], bytes, nbytes);
+  raw_output(nbytes, &cmd_buffer[curr_char]); /* Echo data back to console */
+  if (nbytes == 1 && cmd_buffer[curr_char] == '\r') {
+    /* User hit enter, process command */
+    output("\r\n");
+    bflb_mtimer_delay_ms(1); /* There is a microsecond delay as well */
+    cmd_buffer[curr_char] = '\0';
+    debuglog("Processing command '%s'\r\n", &cmd_buffer[0]);
+    process_cmd(&cmd_buffer[0], curr_char - 1);
+    output("%s", prompt);
+    curr_char = 0;
+    return;
+  }
+  curr_char += nbytes;
+}
+
+void dtr_changed(bool dtr) {
+  if (dtr) {
+    debuglog("DTR enabled: requesting prompt\r\n");
+    display_prompt = true;
+  }
+}
+
+int main(void) {
+  board_init();
+
+  cdc_acm_init();
+  debuglog("Initialized");
+  dtr_changed_ptr = &dtr_changed;
+  data_received_ptr = &data_received;
+  while (1) {
+    if (display_prompt) {
+      /* We can't display directly on the dtr_enabled interrupt, must be on the
+       * main loop. Without any delay, we will not see a prompt. But even 1ms
+       * is enough
+       */
+      display_prompt = false;
+      bflb_mtimer_delay_ms(1);
+      output(prompt);
+      debuglog("displayed prompt\r\n");
+      curr_char = 0;
+    }
   }
 }