ffcb904b66
Includes the Source (as an Eclipse project) and the Hardware files (including schematic, layout, gerbers, and bill of materials.) The firmware is extremely incomplete. At this point the DDS chips work (with controlled phase relationship), the LCD (with fast-ish SPI, scrolling, and GFX, modified from Adafruit's library), the encoder knob, and LED work. The ADC is capturing, but not in a usable way, but it's enough to feed the DSP code and see a nice pretty waterfall. Timers, interrupts, and DACs are not working yet.
107 lines
3 KiB
C
107 lines
3 KiB
C
//
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// This file is part of the µOS++ III distribution.
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// Copyright (c) 2014 Liviu Ionescu.
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//
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#ifndef ARM_SEMIHOSTING_H_
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#define ARM_SEMIHOSTING_H_
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// ----------------------------------------------------------------------------
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// Semihosting operations.
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enum OperationNumber
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{
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// Regular operations
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SEMIHOSTING_EnterSVC = 0x17,
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SEMIHOSTING_ReportException = 0x18,
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SEMIHOSTING_SYS_CLOSE = 0x02,
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SEMIHOSTING_SYS_CLOCK = 0x10,
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SEMIHOSTING_SYS_ELAPSED = 0x30,
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SEMIHOSTING_SYS_ERRNO = 0x13,
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SEMIHOSTING_SYS_FLEN = 0x0C,
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SEMIHOSTING_SYS_GET_CMDLINE = 0x15,
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SEMIHOSTING_SYS_HEAPINFO = 0x16,
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SEMIHOSTING_SYS_ISERROR = 0x08,
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SEMIHOSTING_SYS_ISTTY = 0x09,
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SEMIHOSTING_SYS_OPEN = 0x01,
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SEMIHOSTING_SYS_READ = 0x06,
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SEMIHOSTING_SYS_READC = 0x07,
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SEMIHOSTING_SYS_REMOVE = 0x0E,
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SEMIHOSTING_SYS_RENAME = 0x0F,
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SEMIHOSTING_SYS_SEEK = 0x0A,
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SEMIHOSTING_SYS_SYSTEM = 0x12,
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SEMIHOSTING_SYS_TICKFREQ = 0x31,
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SEMIHOSTING_SYS_TIME = 0x11,
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SEMIHOSTING_SYS_TMPNAM = 0x0D,
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SEMIHOSTING_SYS_WRITE = 0x05,
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SEMIHOSTING_SYS_WRITEC = 0x03,
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SEMIHOSTING_SYS_WRITE0 = 0x04,
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// Codes returned by SEMIHOSTING_ReportException
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ADP_Stopped_ApplicationExit = ((2 << 16) + 38),
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ADP_Stopped_RunTimeError = ((2 << 16) + 35),
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};
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// ----------------------------------------------------------------------------
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// SWI numbers and reason codes for RDI (Angel) monitors.
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#define AngelSWI_ARM 0x123456
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#ifdef __thumb__
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#define AngelSWI 0xAB
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#else
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#define AngelSWI AngelSWI_ARM
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#endif
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// For thumb only architectures use the BKPT instruction instead of SWI.
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#if defined(__ARM_ARCH_7M__) \
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|| defined(__ARM_ARCH_7EM__) \
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|| defined(__ARM_ARCH_6M__)
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#define AngelSWIInsn "bkpt"
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#define AngelSWIAsm bkpt
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#else
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#define AngelSWIInsn "swi"
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#define AngelSWIAsm swi
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#endif
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static inline int
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__attribute__ ((always_inline))
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call_host (int reason, void* arg)
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{
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int value;
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asm volatile (
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" mov r0, %[rsn] \n"
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" mov r1, %[arg] \n"
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" " AngelSWIInsn " %[swi] \n"
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" mov %[val], r0"
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: [val] "=r" (value) /* Outputs */
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: [rsn] "r" (reason), [arg] "r" (arg), [swi] "i" (AngelSWI) /* Inputs */
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: "r0", "r1", "r2", "r3", "ip", "lr", "memory", "cc"
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// Clobbers r0 and r1, and lr if in supervisor mode
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);
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// Accordingly to page 13-77 of ARM DUI 0040D other registers
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// can also be clobbered. Some memory positions may also be
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// changed by a system call, so they should not be kept in
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// registers. Note: we are assuming the manual is right and
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// Angel is respecting the APCS.
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return value;
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}
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// ----------------------------------------------------------------------------
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// Function used in _exit() to return the status code as Angel exception.
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static inline void
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__attribute__ ((always_inline,noreturn))
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report_exception (int reason)
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{
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call_host (SEMIHOSTING_ReportException, (void*) reason);
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for (;;)
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;
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}
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// ----------------------------------------------------------------------------
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#endif // ARM_SEMIHOSTING_H_
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