small pioasm improvements (raspberrypi#2224)

- fix disassembly of `wait jmppin`
- fix incorrect error message
- make python output emit `word(x)` for all unsupported instructions

Author: kilograham

tools/pioasm/pio_assembler.cpp

@@ -63,7 +63,7 @@ void program::set_pio_version(const yy::location &l, int version) {
 
 void program::set_clock_div(const yy::location &l, float clock_div) {
     if (clock_div < 1.0f || clock_div >= 65536.0f) {
-        throw syntax_error(l, "clock divider must be between 1 and 65546");
+        throw syntax_error(l, "clock divider must be between 1 and 65535");
     }
     clock_div_int = (uint16_t)clock_div;
     if (clock_div_int == 0) {

tools/pioasm/pio_disassembler.cpp

@@ -56,7 +56,9 @@ std::string disassemble(uint inst, uint sideset_bits_including_opt, bool sideset
                     if (arg2 & 0x1cu) {
                         invalid = true;
                     } else if (arg2) {
-                        guts = "jmppin " + std::to_string(arg2 & 3u);
+                        guts = "jmppin + " + std::to_string(arg2 & 3u);
+                    } else {
+                        guts = "jmppin";
                     }
                     break;
             }
@@ -131,7 +133,7 @@ std::string disassemble(uint inst, uint sideset_bits_including_opt, bool sideset
                 op("mov");
                 std::string guts = dest + ", ";
                 if (operation == 1) {
-                    guts += "!";
+                    guts += "~";
                 } else if (operation == 2) {
                     guts += "::";
                 }
@@ -193,6 +195,9 @@ std::string disassemble(uint inst, uint sideset_bits_including_opt, bool sideset
     }
     delay &= ((1u << (5 - sideset_bits_including_opt)) - 1u);
     ss << std::left << std::setw(4) << (delay ? ("[" + std::to_string(delay) + "]") : "");
-    return ss.str();
+    // remove trailing spaces
+    auto str = ss.str();
+    str.erase(str.find_last_not_of(' ')+1);
+    return str;
 }
 

tools/pioasm/python_output.cpp

@@ -204,6 +204,9 @@ struct python_output : public output_format {
                             }
                         }
                         break;
+                    default:
+                        invalid = true;
+                        break;
                 }
                 if (!invalid) {
                     guts = ((arg1 & 4u) ? "1, " : "0, ") + guts;
@@ -254,23 +257,24 @@ struct python_output : public output_format {
                 uint operation = arg2 >> 3u;
                 if (source.empty() || dest.empty() || operation == 3) {
                     invalid = true;
-                }
-                if (dest == source && (arg1 == 1 || arg2 == 2) && operation == 0) {
-                    op("nop");
-                    op_guts("");
                 } else {
-                    op("mov");
-                    std::string guts = dest + ", ";
-                    if (operation == 1) {
-                        guts += "invert(";
-                    } else if (operation == 2) {
-                        guts += "reverse(";
-                    }
-                    guts += source;
-                    if (operation == 1 || operation == 2) {
-                        guts += ")";
+                    if (dest == source && (arg1 == 1 || arg2 == 2) && operation == 0) {
+                        op("nop");
+                        op_guts("");
+                    } else {
+                        op("mov");
+                        std::string guts = dest + ", ";
+                        if (operation == 1) {
+                            guts += "invert(";
+                        } else if (operation == 2) {
+                            guts += "reverse(";
+                        }
+                        guts += source;
+                        if (operation == 1 || operation == 2) {
+                            guts += ")";
+                        }
+                        op_guts(guts);
                     }
-                    op_guts(guts);
                 }
                 break;
             }
@@ -310,7 +314,9 @@ struct python_output : public output_format {
         if (invalid) {
             op("word");
             ss << std::hex;
-            op_guts(std::to_string(inst));
+            std::stringstream guts;
+            guts << std::hex << std::showbase << std::setfill('0') << std::setw(4) << inst;
+            op_guts(guts.str());
         }
         uint delay = ((uint) inst >> 8u) & 0x1f;
         ss << std::left << std::setw(9);

tools/pioasm/test/amethyst.pio

@@ -44,3 +44,10 @@ wait gpio 40
 .pio_version 1
 .mov_status txfifo < 12
 .mov_status irq next set 3
+
+.program python
+.pio_version 1
+wait 0 jmppin
+wait 0 jmppin + 3
+mov x, !x
+.word 0x1234