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allow use of characters 0-31 #155

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allow use of characters 0-31 #155

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2 changes: 2 additions & 0 deletions video/agon.h
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,8 @@
#define VDP_RTC 0x87 // RTC
#define VDP_KEYSTATE 0x88 // Keyboard repeat rate and LED status
#define VDP_MOUSE 0x89 // Mouse data
#define VDP_UDG 0x90 // User defined characters
#define VDP_UDG_RESET 0x91 // Reset UDGs
#define VDP_BUFFERED 0xA0 // Buffered commands
#define VDP_UPDATER 0xA1 // Update VDP
#define VDP_LOGICALCOORDS 0xC0 // Switch BBC Micro style logical coords on and off
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33 changes: 33 additions & 0 deletions video/agon_fonts.h
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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,39 @@ namespace fabgl {
uint8_t FONT_AGON_DATA[256*8];

static const uint8_t FONT_AGON_BITMAP[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //

0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
0x18, 0x18, 0x18, 0x18, 0x18, 0x00, 0x18, 0x00, // !
0x6c, 0x6c, 0x6c, 0x00, 0x00, 0x00, 0x00, 0x00, // "
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2 changes: 1 addition & 1 deletion video/graphics.h
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Original file line number Diff line number Diff line change
Expand Up @@ -30,7 +30,7 @@ uint8_t palette[64]; // Storage for the palette
// Copy the AGON font data from Flash to RAM
//
void copy_font() {
memcpy(fabgl::FONT_AGON_DATA + 256, fabgl::FONT_AGON_BITMAP, sizeof(fabgl::FONT_AGON_BITMAP));
memcpy(fabgl::FONT_AGON_DATA, fabgl::FONT_AGON_BITMAP, sizeof(fabgl::FONT_AGON_BITMAP));
}

// Redefine a character in the font
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9 changes: 6 additions & 3 deletions video/vdu.h
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Original file line number Diff line number Diff line change
Expand Up @@ -10,13 +10,12 @@
// Handle VDU commands
//
void VDUStreamProcessor::vdu(uint8_t c) {

// We want to send raw chars back to the debugger
// this allows binary (faster) data transfer in ZDI mode
// to inspect memory and register values
//
if(consoleMode) {
DBGSerial.write (c);
if (consoleMode) {
DBGSerial.write(c);
}

switch(c) {
Expand Down Expand Up @@ -86,6 +85,10 @@ void VDUStreamProcessor::vdu(uint8_t c) {
case 0x1A: // Reset text and graphics viewports
vdu_resetViewports();
break;
case 0x1B: { // VDU 27
auto b = readByte_t(); if (b == -1) return;
plotCharacter(b);
} break;
case 0x1C: // Define a text viewport
vdu_textViewport();
break;
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9 changes: 9 additions & 0 deletions video/vdu_sys.h
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Original file line number Diff line number Diff line change
Expand Up @@ -147,6 +147,15 @@ void VDUStreamProcessor::vdu_sys_video() {
case VDP_MOUSE: { // VDU 23, 0, &89, command, <args>
vdu_sys_mouse();
} break;
case VDP_UDG: { // VDU 23, 0, &90, c, <args>
auto c = readByte_t(); // Redefine a display character
if (c >= 0) {
vdu_sys_udg(c);
}
} break;
case VDP_UDG_RESET: { // VDU 23, 0, &91
copy_font(); // Reset UDGs
} break;
case VDP_BUFFERED: { // VDU 23, 0, &A0, bufferId; command, <args>
vdu_sys_buffered();
} break;
Expand Down