mirror of
https://github.com/V2RetroComputing/analog.git
synced 2024-11-23 02:32:57 +00:00
87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
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#include <string.h>
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#include <hardware/pio.h>
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#include "common/config.h"
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#include "abus.pio.h"
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#include "z80/businterface.h"
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#include "z80/z80buf.h"
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static inline void __time_critical_func(pcpi_read)(uint32_t address) {
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switch(address & 0x7) {
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case 0: // Read Data from Z80
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clr_6502_stat;
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break;
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case 5: // Z80 Reset
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z80_res = 1;
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break;
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case 6: // Z80 INT
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//z80_irq = 1;
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break;
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case 7: // Z80 NMI
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z80_nmi = 1;
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break;
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}
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}
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static inline void __time_critical_func(pcpi_write)(uint32_t address, uint32_t value) {
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switch(address & 0x7) {
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case 0:
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case 2:
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case 3:
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case 4:
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break;
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case 1: // Write Data to Z80
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pcpi_reg[1] = value & 0xff;
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set_z80_stat;
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break;
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case 5:
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case 6:
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case 7:
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pcpi_read(address);
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break;
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}
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}
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static inline void __time_critical_func(shadow_memory)(uint32_t address, uint32_t value) {
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// Shadow parts of the Apple's memory by observing the bus write cycles
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if(CARD_SELECT) {
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if(CARD_DEVSEL) {
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if((value & (1u << CONFIG_PIN_APPLEBUS_RW-CONFIG_PIN_APPLEBUS_DATA_BASE)) == 0) {
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pcpi_write(address, value);
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} else {
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pcpi_read(address);
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}
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}
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// Config memory in card slot-rom address space
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if(CARD_IOSEL) {
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if((value & (1u << CONFIG_PIN_APPLEBUS_RW-CONFIG_PIN_APPLEBUS_DATA_BASE)) == 0) {
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config_memory[address & 0x1F] = value;
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if((address & 0xFF) == 0xFF)
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config_handler();
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}
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}
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}
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}
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void __time_critical_func(z80_businterface)() {
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while(v2mode == MODE_APPLICARD) {
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uint32_t value = pio_sm_get_blocking(CONFIG_ABUS_PIO, ABUS_MAIN_SM);
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uint32_t dout;
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uint32_t address = (value >> 10) & 0xffff;
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if((value & (1u << CONFIG_PIN_APPLEBUS_RW-CONFIG_PIN_APPLEBUS_DATA_BASE)) != 0) {
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if(CARD_SELECT) {
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dout = pcpi_reg[address & 0x7];
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// device read access
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pio_sm_put_blocking(CONFIG_ABUS_PIO, ABUS_DEVICE_READ_SM, dout);
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}
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}
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shadow_memory(address, value);
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}
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}
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