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6502-emu
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Only try interpreting control sequences in interactive mode

This commit is contained in:
David Buchanan 2022-06-11 18:27:53 +01:00
parent e9cdef2b48
commit 8905c49b98
2 changed files with 13 additions and 9 deletions
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2
6502-emu.c
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@ -175,7 +175,7 @@ int main(int argc, char *argv[])
}
//init_tables();
init_uart();
init_uart(interactive);
reset_cpu(a, x, y, sp, sr, pc);
run_cpu(cycles, verbose, mem_dump, break_pc, fast);

20
6850.c
View File

@ -9,8 +9,9 @@
static int n;
static union UartStatusReg uart_SR;
static uint8_t incoming_char;
static int interactive;
void init_uart() {
void init_uart(int is_interactive) {
memory[DATA_ADDR] = 0;
uart_SR.byte = 0;
@ -19,6 +20,7 @@ void init_uart() {
uart_SR.bits.RDRF = 0;
incoming_char = 0;
interactive = is_interactive;
}
int stdin_ready() {
@ -40,17 +42,19 @@ void step_uart() {
}
/* update input register if empty */
if ((n++ % 10000) == 0) { // polling stdin every cycle is performance intensive. This is a bit of a dirty hack.
if ((n++ % 100) == 0) { // polling stdin every cycle is performance intensive. This is a bit of a dirty hack.
if (!uart_SR.bits.RDRF && stdin_ready()) { // the real hardware has no buffer. Remote the RDRF check for more accurate emulation.
if (read(0, &incoming_char, 1) != 1) {
printf("Warning: read() returned 0\n");
}
if (incoming_char == 0x18) { // CTRL+X
printf("\r\n");
exit(0);
}
if (incoming_char == 0x7F) { // Backspace
incoming_char = '\b';
if (interactive) {
if (incoming_char == 0x18) { // CTRL+X
printf("\r\n");
exit(0);
}
if (incoming_char == 0x7F) { // Backspace
incoming_char = '\b';
}
}
uart_SR.bits.RDRF = 1;
}