add circuitpython code

1 files changed, 51 insertions, 0 deletions

diff --git a/circuitpython/shared/runtime/semihosting.h b/circuitpython/shared/runtime/semihosting.h
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+++ b/circuitpython/shared/runtime/semihosting.h
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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Ayke van Laethem
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef MICROPY_INCLUDED_LIB_UTILS_SEMIHOSTING_H
+#define MICROPY_INCLUDED_LIB_UTILS_SEMIHOSTING_H
+
+/*
+
+To use semi-hosting for a replacement UART:
+- Add lib/semihosting/semihosting.c to the Makefile sources.
+- Call mp_semihosting_init() in main(), around the time UART is initialized.
+- Replace mp_hal_stdin_rx_chr and similar in mphalport.c with the semihosting equivalent.
+- Include lib/semihosting/semihosting.h in the relevant files.
+
+Then make sure the debugger is attached and enables semihosting.  In OpenOCD this is
+done with ARM semihosting enable followed by reset.  The terminal will need further
+configuration to work with MicroPython (bash: stty raw -echo).
+
+*/
+
+#include <stddef.h>
+#include <stdint.h>
+
+void mp_semihosting_init();
+int mp_semihosting_rx_char();
+uint32_t mp_semihosting_tx_strn(const char *str, size_t len);
+uint32_t mp_semihosting_tx_strn_cooked(const char *str, size_t len);
+
+#endif // MICROPY_INCLUDED_LIB_UTILS_SEMIHOSTING_H