mirror of
https://github.com/V2RetroComputing/analog.git
synced 2025-02-18 06:30:33 +00:00
44 lines
1.4 KiB
C
44 lines
1.4 KiB
C
|
#include <string.h>
|
||
|
|
#include <hardware/pio.h>
|
||
|
|
#include "common/config.h"
|
||
|
|
#include "common/buffers.h"
|
||
|
|
#include "abus.pio.h"
|
||
|
|
#include "diag/businterface.h"
|
||
|
|
|
||
|
|
static inline void __time_critical_func(shadow_memory)(uint32_t address, uint32_t value) {
|
||
|
|
// Shadow parts of the Apple's memory by observing the bus write cycles
|
||
|
|
if(CARD_SELECT) {
|
||
|
|
if((value & (1u << CONFIG_PIN_APPLEBUS_RW-CONFIG_PIN_APPLEBUS_DATA_BASE)) == 0) {
|
||
|
|
apple_memory[address] = value;
|
||
|
|
}
|
||
|
|
// Config memory in card slot-rom address space
|
||
|
|
if(CARD_IOSEL) {
|
||
|
|
if((value & (1u << CONFIG_PIN_APPLEBUS_RW-CONFIG_PIN_APPLEBUS_DATA_BASE)) == 0) {
|
||
|
|
config_memory[address & 0x1F] = value;
|
||
|
|
if((address & 0xFF) == 0xFF)
|
||
|
|
config_handler();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
void __time_critical_func(diag_businterface)() {
|
||
|
|
while(v2mode == MODE_DIAG) {
|
||
|
|
uint32_t value = pio_sm_get_blocking(CONFIG_ABUS_PIO, ABUS_MAIN_SM);
|
||
|
|
uint32_t dout;
|
||
|
|
uint32_t address = (value >> 10) & 0xffff;
|
||
|
|
|
||
|
|
if((value & (1u << CONFIG_PIN_APPLEBUS_RW-CONFIG_PIN_APPLEBUS_DATA_BASE)) != 0) {
|
||
|
|
if(CARD_SELECT) {
|
||
|
|
dout = apple_memory[address];
|
||
|
|
|
||
|
|
// device read access
|
||
|
|
pio_sm_put_blocking(CONFIG_ABUS_PIO, ABUS_DEVICE_READ_SM, dout);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
shadow_memory(address, value);
|
||
|
|
}
|
||
|
|
}
|