cmd: add conitrace command

The 'conitrace' command prints the codes received from the console input as
hexadecimal numbers.

This developer utility is useful for testing the handling of special keys
by keyboard drivers.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

diff --git a/cmd/Kconfig b/cmd/Kconfig
index 13d4c991bf8bf7fc82b601ebc81f23a9dbcee1b6..cf97a0f2be31f5ffb7d1d59c1d52d2127c44bb37 100644 (file)
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1338,6 +1338,12 @@ config CMD_CACHE
        help
          Enable the "icache" and "dcache" commands
 
+config CMD_CONITRACE
+       bool "conitrace - trace console input codes"
+       help
+         Enable the 'conitrace' command which displays the codes received
+         from the console input as hexadecimal numbers.
+
 config CMD_DISPLAY
        bool "Enable the 'display' command, for character displays"
        help

diff --git a/cmd/Makefile b/cmd/Makefile
index a61fab6583df4f4a5e0658d46eb6a00df74e42be..d3815abf26736665f55849b59ad9ea9425b05480 100644 (file)
--- a/cmd/Makefile
+++ b/cmd/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_CMD_CACHE) += cache.o
 obj-$(CONFIG_CMD_CBFS) += cbfs.o
 obj-$(CONFIG_CMD_CLK) += clk.o
 obj-$(CONFIG_CMD_CONFIG) += config.o
+obj-$(CONFIG_CMD_CONITRACE) += conitrace.o
 obj-$(CONFIG_CMD_CONSOLE) += console.o
 obj-$(CONFIG_CMD_CPU) += cpu.o
 obj-$(CONFIG_DATAFLASH_MMC_SELECT) += dataflash_mmc_mux.o

diff --git a/cmd/conitrace.c b/cmd/conitrace.c
new file mode 100644 (file)
index 0000000..85c5422
--- /dev/null
+++ b/cmd/conitrace.c
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * The 'conitrace' command prints the codes received from the console input as
+ * hexadecimal numbers.
+ *
+ * Copyright (c) 2018, Heinrich Schuchardt <xypron.glpk@gmx.de>
+ */
+#include <common.h>
+#include <command.h>
+
+static int do_conitrace(cmd_tbl_t *cmdtp, int flag, int argc,
+                       char * const argv[])
+{
+       bool first = true;
+
+       printf("Waiting for your input\n");
+       printf("To terminate type 'x'\n");
+
+       /* Empty input buffer */
+       while (tstc())
+               getc();
+
+       for (;;) {
+               int c = getc();
+
+               if (first && (c == 'x' || c == 'X'))
+                       break;
+
+               printf("%02x ", c);
+               first = false;
+
+               /* 1 ms delay - serves to detect separate keystrokes */
+               udelay(1000);
+               if (!tstc()) {
+                       printf("\n");
+                       first = true;
+               }
+       }
+
+       return CMD_RET_SUCCESS;
+}
+
+#ifdef CONFIG_SYS_LONGHELP
+static char conitrace_help_text[] = "";
+#endif
+
+U_BOOT_CMD_COMPLETE(
+       conitrace, 2, 0, do_conitrace,
+       "trace console input",
+       conitrace_help_text, NULL
+);