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https://github.com/V2RetroComputing/analog.git
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40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
#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 "common/buffers.h"
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#include "serial/businterface.h"
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#include "serial/serialbuffer.h"
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static inline void __time_critical_func(serial_read)(uint32_t address) {
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switch(address & 0x7) {
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case 8: // Read Data from RX FIFO
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serial_rx_advance();
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break;
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}
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}
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static inline void __time_critical_func(serial_write)(uint32_t address, uint32_t value) {
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switch(address & 0x7) {
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case 8: // Write Data to TX FIFO
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serial_tx_push(value & 0xff);
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break;
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case 9:
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serial_reg[9] &= ACIA_STATUS_RXOVER;
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break;
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}
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}
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void __time_critical_func(serial_businterface)(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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serial_write(address, value);
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} else {
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serial_read(address);
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}
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}
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}
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}
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