--- /dev/null
+/***************************************************************************
+ * Copyright (C) 2008 by Dominic Rath *
+ * Dominic.Rath@gmx.de *
+ * Copyright (C) 2008 by Spencer Oliver *
+ * spen@spen-soft.co.uk *
+ * *
+ * 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., *
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
+ ***************************************************************************/
+
+#include "dcc_stdio.h"
+
+#if defined(__ARM_ARCH_7M__)
+
+/* we use the cortex_m3 DCRDR reg to simulate a arm7_9 dcc channel
+ * DCRDR[7:0] is used by target for status
+ * DCRDR[15:8] is used by target for write buffer
+ * DCRDR[23:16] is used for by host for status
+ * DCRDR[31:24] is used for by host for write buffer */
+
+#define DCRDR_WRSTS *((volatile u8*)0xE000EDF8)
+#define DCRDR_WRDAT *((volatile u8*)0xE000EDF9)
+
+#define BUSY 1
+
+void dbg_write(u32 dcc_data)
+{
+ int len = 4;
+
+ while (len--)
+ {
+ /* wait for data ready */
+ while (DCRDR_WRSTS & BUSY);
+
+ /* write our data */
+ DCRDR_WRDAT = (u8)(dcc_data & 0xff);
+ /* set write flag - tell host there is data */
+ DCRDR_WRSTS = BUSY;
+ dcc_data >>= 8;
+ }
+}
+
+#elif defined(__ARM_ARCH_4T__) || defined(__ARM_ARCH_5TE__)
+
+void dbg_write(u32 dcc_data)
+{
+ u32 dcc_status;
+
+ do {
+ asm volatile("mrc p14, 0, %0, c0, c0" : "=r" (dcc_status));
+ } while (dcc_status & 0x2);
+
+ asm volatile("mcr p14, 0, %0, c1, c0" : : "r" (dcc_data));
+}
+
+#else
+ #error unsupported target
+#endif
+
+
+void dbg_write_u32(u32 *val, u32 len)
+{
+ dbg_write(0x01 | 0x0400 | ((len & 0xffff) << 16));
+
+ while (len > 0)
+ {
+ dbg_write(*val);
+
+ val++;
+ len--;
+ }
+}
+
+void dbg_write_u16(u16 *val, u32 len)
+{
+ u32 dcc_data;
+
+ dbg_write(0x01 | 0x0200 | ((len & 0xffff) << 16));
+
+ while (len > 0)
+ {
+ dcc_data = val[0] | (val[1] << 8)
+ | ((len > 1) ? (val[2] | (val[3] << 8)) << 16 : 0x00);
+
+ dbg_write(dcc_data);
+
+ val += 2;
+ len -= 2;
+ }
+}
+
+void dbg_write_u8(u8 *val, u32 len)
+{
+ u32 dcc_data;
+
+ dbg_write(0x01 | 0x0100 | ((len & 0xffff) << 16));
+
+ while (len > 0)
+ {
+ dcc_data = val[0]
+ | ((len > 1) ? val[1] << 8 : 0x00)
+ | ((len > 2) ? val[2] << 16 : 0x00)
+ | ((len > 3) ? val[3] << 24 : 0x00);
+
+ dbg_write(dcc_data);
+
+ val += 2;
+ len -= 2;
+ }
+}
+
+void dbg_write_str(u8 *msg)
+{
+ int len;
+ u32 dcc_data;
+
+ for (len = 0; msg[len] && (len < 65536); len++);
+
+ dbg_write(0x01 | ((len & 0xffff) << 16));
+
+ while (len > 0)
+ {
+ dcc_data = msg[0]
+ | ((len > 1) ? msg[1] << 8 : 0x00)
+ | ((len > 2) ? msg[2] << 16 : 0x00)
+ | ((len > 3) ? msg[3] << 24 : 0x00);
+ dbg_write(dcc_data);
+
+ msg += 4;
+ len -= 4;
+ }
+}
+
+void dbg_write_char(u8 msg)
+{
+ dbg_write(0x02 | ((msg & 0xff) << 16));
+}
--- /dev/null
+/***************************************************************************
+ * Copyright (C) 2008 by Dominic Rath *
+ * Dominic.Rath@gmx.de *
+ * Copyright (C) 2008 by Spencer Oliver *
+ * spen@spen-soft.co.uk *
+ * *
+ * 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., *
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
+ ***************************************************************************/
+
+#ifndef DCC_STDIO_H
+#define DCC_STDIO_H
+
+typedef unsigned char u8;
+typedef unsigned short u16;
+typedef unsigned long u32;
+
+void dbg_write_u32(u32 *val, u32 len);
+void dbg_write_u16(u16 *val, u32 len);
+void dbg_write_u8(u8 *val, u32 len);
+
+void dbg_write_str(u8 *msg);
+void dbg_write_char(u8 msg);
+
+#endif /* DCC_STDIO_H */
--- /dev/null
+/***************************************************************************
+ * Copyright (C) 2008 by Spencer Oliver *
+ * spen@spen-soft.co.uk *
+ * *
+ * 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., *
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
+ ***************************************************************************/
+
+#include "dcc_stdio.h"
+
+int main(void)
+{
+ /* enable openocd debugmsg at the gdb prompt
+ * monitor target_request debugmsgs enable */
+
+ dbg_write_str("hello world");
+ dbg_write_char('a');
+
+ while(1) {}
+}
projects / openocd / commitdiff