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Added emulation of Apple2Pi card v6.x based on Raspberry Pi Pico - see https://github.com/a2retrosystems/A2retroNET

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The Raspberry Pi Pico is connected to the Linux computer via its USB port, so every Linux computer with USB 1.1 ACM CDC virtual serial port (usually exposed as /dev/ttyACM0) support can be used.

For the Apple2Pi card v6.x see https://youtu.be/WHq4d5E-5p8?t=1083
This commit is contained in:
Oliver Schmidt 2022-08-25 10:30:18 +02:00
parent f9b513a838
commit 6951ff78d7
7 changed files with 543 additions and 0 deletions
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27
pipico/CMakeLists.txt Normal file
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set(PROJECT_NAME Apple-II-Pi)
cmake_minimum_required(VERSION 3.12)
include(pico_sdk_import.cmake)
pico_sdk_init()
project(${PROJECT_NAME} C CXX ASM)
add_executable(${PROJECT_NAME})
pico_add_extra_outputs(${PROJECT_NAME})
pico_enable_stdio_uart(${PROJECT_NAME} 0)
pico_enable_stdio_usb(${PROJECT_NAME} 1)
pico_generate_pio_header(${PROJECT_NAME} ${CMAKE_CURRENT_LIST_DIR}/bus.pio)
target_sources(${PROJECT_NAME} PRIVATE
main.c
board.c
incbin.S
)
target_link_libraries(${PROJECT_NAME} PRIVATE
pico_stdlib
pico_multicore
hardware_pio
)

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MIT License
Copyright (c) 2022 Oliver Schmidt (https://a2retro.de/)
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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/*
MIT License
Copyright (c) 2022 Oliver Schmidt (https://a2retro.de/)
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#include "bus.pio.h"
extern const __attribute__((aligned(4))) uint8_t firmware[];
static bool __not_in_flash( "active") active;
static uint32_t __not_in_flash("command") command;
static uint32_t __not_in_flash("control") control;
void __not_in_flash_func(board)() {
while (true) {
uint32_t enbl = pio_sm_get_blocking(pio0, sm_enbl);
uint32_t addr = enbl & 0x0FFF;
uint32_t io = enbl & 0x0F00; // IOSTRB or IOSEL
uint32_t strb = enbl & 0x0800; // IOSTRB
uint32_t read = enbl & 0x1000; // R/W
if (addr == 0x0FFF) {
active = false;
}
if (read) {
if (!io) { // DEVSEL
switch (addr & 0xF) {
case 0x8:
pio_sm_put(pio0, sm_read, sio_hw->fifo_rd);
break;
case 0x9:
// SIO_FIFO_ST_VLD_BITS _u(0x00000001)
// SIO_FIFO_ST_RDY_BITS _u(0x00000002)
pio_sm_put(pio0, sm_read, (sio_hw->fifo_st & 3) << 3);
break;
case 0xA:
pio_sm_put(pio0, sm_read, command);
break;
case 0xB:
pio_sm_put(pio0, sm_read, control);
break;
}
} else {
if (!strb || active) {
pio_sm_put(pio0, sm_read, firmware[addr]);
}
}
} else {
uint32_t data = pio_sm_get_blocking(pio0, sm_write);
if (!io) { // DEVSEL
switch (addr & 0xF) {
case 0x8:
sio_hw->fifo_wr = data;
break;
case 0xA:
command = data;
break;
case 0xB:
control = data;
break;
}
}
}
if (io && !strb) {
active = true;
}
gpio_put(gpio_led, active);
}
}

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///////////////////////////////////////////////////////////////////////////////
/*
MIT License
Copyright (c) 2022 Oliver Schmidt (https://a2retro.de/)
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
///////////////////////////////////////////////////////////////////////////////
.define public gpio_addr 2 // 12 pins
.define public gpio_rw 14
.define public gpio_data 15 // 8 pins
.define public gpio_led 25
.define public gpio_enbl 26 // DEVSEL | IOSEL | IOSTRB
.define public gpio_irq 27
.define public gpio_rdy 28
.define public size_addr 13 // incl. R/W
.define public size_data 8
.define public sm_enbl 0
.define public sm_read 1 // from Apple II perspective
.define public sm_write 2 // from Apple II perspective
.define irq_write 4
/*
Implementation of the Apple II peripheral bus protocol:
- /DEVSEL, /IOSEL and /IOSTRB are supposed to combined to ENBL via an AND gate.
- On the falling edge of ENBL, the lines A0-A11 and R/W are sampled and pushed
into the 'enable' state machine RX FIFO.
- In case of an Apple II write cycle, the lines D0-D7 are sampled ~300ns later
and pushed into the 'write' state machine RX FIFO.
- If a byte is pushed into the 'read' state machine TX FIFO, it is driven out
to the lines D0-D7 until the rising edge of ENBL.
*/
///////////////////////////////////////////////////////////////////////////////
.program enbl
.wrap_target
idle:
wait 1 gpio gpio_enbl // wait for ENBL to rise
wait 0 gpio gpio_enbl // wait for ENBL to fall
in pins, size_addr // shift A0-A11 + R/W into ISR
jmp pin idle // jump to idle if R/W is high
irq irq_write // Set 'write' IRQ
.wrap
% c-sdk {
static inline void enbl_program_init(uint offset) {
pio_sm_config c = enbl_program_get_default_config(offset);
// in_base: gpio_addr
sm_config_set_in_pins(&c, gpio_addr);
// shift_right: false
// autopush: true
// push_threshold: size_addr
sm_config_set_in_shift(&c, false, true, size_addr);
// pin: gpio_rw
sm_config_set_jmp_pin(&c, gpio_rw);
// state_machine: sm_enbl
// initial_pc: offset
pio_sm_init(pio0, sm_enbl, offset, &c);
// state_machine: sm_enbl
pio_sm_set_enabled(pio0, sm_enbl, true);
}
%}
///////////////////////////////////////////////////////////////////////////////
.program write
.wrap_target
wait 1 irq irq_write [31] // wait for 'write' IRQ to be set and clear it
// [31 cycles to allow 6502 to set up D0-D7]
in pins, size_data // shift D0-D7 into ISR
.wrap
% c-sdk {
static inline void write_program_init(uint offset) {
pio_sm_config c = write_program_get_default_config(offset);
// in_base: gpio_data
sm_config_set_in_pins(&c, gpio_data);
// shift_right: false
// autopush: true
// push_threshold: size_data
sm_config_set_in_shift(&c, false, true, size_data);
// state_machine: sm_write
// initial_pc: offset
pio_sm_init(pio0, sm_write, offset, &c);
// state_machine: sm_write
pio_sm_set_enabled(pio0, sm_write, true);
}
%}
///////////////////////////////////////////////////////////////////////////////
.program read
/*
Both set and set-side are limited to 5 pins each. So both set and side-set are
configured to set (the direction of) 4 pins. This approach allows to set the
direction of D0-D7 in one operation.
Note: The naive approach would have been
mov osr, ~x // move 0xFFFFFFFF to OSR
out pindirs, size_data // enable output of D0-D7
[...]
mov osr, x // move 0x00000000 to OSR
out pindirs, size_data // disable output of D0-D7
but this would have required two operations and destroyed OSR.
*/
.side_set (size_data / 2) opt pindirs
.wrap_target
pull block // pull data into OSR, block on empty FIFO
out pins, size_data // shift OSR out to D0-D7
set pindirs, 15 side 15 // enable output of D0-D7
wait 1 gpio gpio_enbl // wait for ENBL to rise
set pindirs, 0 side 0 // disable output of D0-D7
.wrap
% c-sdk {
static inline void read_program_init(uint offset) {
pio_sm_config c = read_program_get_default_config(offset);
// out_base: gpio_data
// out_count: size_data
sm_config_set_out_pins(&c, gpio_data, size_data);
// shift_right: true
// autopull: false
// pull_threshold: size_data
sm_config_set_out_shift(&c, true, false, size_data);
// set_base: gpio_data
// set_count: size_data / 2
sm_config_set_set_pins(&c, gpio_data, size_data / 2);
// sideset_base: gpio_data + size_data / 2
sm_config_set_sideset_pins(&c, gpio_data + size_data / 2);
// state_machine: sm_read
// initial_pc: offset
pio_sm_init(pio0, sm_read, offset, &c);
// state_machine: sm_read
pio_sm_set_enabled(pio0, sm_read, true);
}
%}
///////////////////////////////////////////////////////////////////////////////

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.section .time_critical.firmware
.global firmware
.type firmware, %object
.balign 4
firmware:
.incbin "../../pidrive/PIROM#062000"

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/*
MIT License
Copyright (c) 2022 Oliver Schmidt (https://a2retro.de/)
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#include <stdio.h>
#include "pico/printf.h"
#include "pico/stdlib.h"
#include "pico/multicore.h"
#include "bus.pio.h"
void board();
#ifdef TRACE
void uart_printf(uart_inst_t *uart, const char *format, ...) {
static char buffer[0x100];
va_list va;
va_start(va, format);
vsnprintf(buffer, sizeof(buffer), format, va);
va_end(va);
buffer[0xFF] = '\0';
uart_puts(uart, buffer);
}
#endif
int main() {
stdio_init_all();
stdio_set_translate_crlf(&stdio_usb, false);
#ifdef TRACE
uart_init(uart0, 115200);
uart_set_translate_crlf(uart0, true);
gpio_set_function(0, GPIO_FUNC_UART);
gpio_set_function(1, GPIO_FUNC_UART);
#endif
for (uint gpio = gpio_addr; gpio < gpio_addr + size_addr; gpio++) {
gpio_init(gpio);
gpio_set_pulls(gpio, false, false); // floating
}
for (uint gpio = gpio_data; gpio < gpio_data + size_data; gpio++) {
pio_gpio_init(pio0, gpio);
gpio_set_pulls(gpio, false, false); // floating
}
gpio_init(gpio_enbl);
gpio_set_pulls(gpio_enbl, false, false); // floating
gpio_init(gpio_irq);
gpio_pull_up(gpio_irq);
gpio_init(gpio_rdy);
gpio_pull_up(gpio_rdy);
gpio_init(gpio_led);
gpio_set_dir(gpio_led, GPIO_OUT);
uint offset;
offset = pio_add_program(pio0, &enbl_program);
enbl_program_init(offset);
offset = pio_add_program(pio0, &write_program);
write_program_init(offset);
offset = pio_add_program(pio0, &read_program);
read_program_init(offset);
multicore_launch_core1(board);
while (true) {
if (multicore_fifo_rvalid()) {
uint32_t data = multicore_fifo_pop_blocking();
putchar(data);
#ifdef TRACE
uart_printf(uart0, "> %02X\n", data);
#endif
}
if (multicore_fifo_wready()) {
int data = getchar_timeout_us(0);
if (data != PICO_ERROR_TIMEOUT) {
multicore_fifo_push_blocking(data);
#ifdef TRACE
uart_printf(uart0, "< %02X\n", data);
#endif
}
}
}
return 0;
}

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# This is a copy of <PICO_SDK_PATH>/external/pico_sdk_import.cmake
# This can be dropped into an external project to help locate this SDK
# It should be include()ed prior to project()
if (DEFINED ENV{PICO_SDK_PATH} AND (NOT PICO_SDK_PATH))
set(PICO_SDK_PATH $ENV{PICO_SDK_PATH})
message("Using PICO_SDK_PATH from environment ('${PICO_SDK_PATH}')")
endif ()
if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT} AND (NOT PICO_SDK_FETCH_FROM_GIT))
set(PICO_SDK_FETCH_FROM_GIT $ENV{PICO_SDK_FETCH_FROM_GIT})
message("Using PICO_SDK_FETCH_FROM_GIT from environment ('${PICO_SDK_FETCH_FROM_GIT}')")
endif ()
if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_PATH} AND (NOT PICO_SDK_FETCH_FROM_GIT_PATH))
set(PICO_SDK_FETCH_FROM_GIT_PATH $ENV{PICO_SDK_FETCH_FROM_GIT_PATH})
message("Using PICO_SDK_FETCH_FROM_GIT_PATH from environment ('${PICO_SDK_FETCH_FROM_GIT_PATH}')")
endif ()
set(PICO_SDK_PATH "${PICO_SDK_PATH}" CACHE PATH "Path to the Raspberry Pi Pico SDK")
set(PICO_SDK_FETCH_FROM_GIT "${PICO_SDK_FETCH_FROM_GIT}" CACHE BOOL "Set to ON to fetch copy of SDK from git if not otherwise locatable")
set(PICO_SDK_FETCH_FROM_GIT_PATH "${PICO_SDK_FETCH_FROM_GIT_PATH}" CACHE FILEPATH "location to download SDK")
if (NOT PICO_SDK_PATH)
if (PICO_SDK_FETCH_FROM_GIT)
include(FetchContent)
set(FETCHCONTENT_BASE_DIR_SAVE ${FETCHCONTENT_BASE_DIR})
if (PICO_SDK_FETCH_FROM_GIT_PATH)
get_filename_component(FETCHCONTENT_BASE_DIR "${PICO_SDK_FETCH_FROM_GIT_PATH}" REALPATH BASE_DIR "${CMAKE_SOURCE_DIR}")
endif ()
# GIT_SUBMODULES_RECURSE was added in 3.17
if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.17.0")
FetchContent_Declare(
pico_sdk
GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
GIT_TAG master
GIT_SUBMODULES_RECURSE FALSE
)
else ()
FetchContent_Declare(
pico_sdk
GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
GIT_TAG master
)
endif ()
if (NOT pico_sdk)
message("Downloading Raspberry Pi Pico SDK")
FetchContent_Populate(pico_sdk)
set(PICO_SDK_PATH ${pico_sdk_SOURCE_DIR})
endif ()
set(FETCHCONTENT_BASE_DIR ${FETCHCONTENT_BASE_DIR_SAVE})
else ()
message(FATAL_ERROR
"SDK location was not specified. Please set PICO_SDK_PATH or set PICO_SDK_FETCH_FROM_GIT to on to fetch from git."
)
endif ()
endif ()
get_filename_component(PICO_SDK_PATH "${PICO_SDK_PATH}" REALPATH BASE_DIR "${CMAKE_BINARY_DIR}")
if (NOT EXISTS ${PICO_SDK_PATH})
message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' not found")
endif ()
set(PICO_SDK_INIT_CMAKE_FILE ${PICO_SDK_PATH}/pico_sdk_init.cmake)
if (NOT EXISTS ${PICO_SDK_INIT_CMAKE_FILE})
message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' does not appear to contain the Raspberry Pi Pico SDK")
endif ()
set(PICO_SDK_PATH ${PICO_SDK_PATH} CACHE PATH "Path to the Raspberry Pi Pico SDK" FORCE)
include(${PICO_SDK_INIT_CMAKE_FILE})