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PICO-56 Code: Initial add
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‎.gitmodules‎

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[submodule "submodules/vrEmuTms9918"]
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path = submodules/vrEmuTms9918
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url = https://github.com/visrealm/vrEmuTms9918.git
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[submodule "submodules/vrEmu6502"]
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path = submodules/vrEmu6502
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url = https://github.com/visrealm/vrEmu6502.git
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[submodule "submodules/vrEmu6522"]
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path = submodules/vrEmu6522
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url = https://github.com/visrealm/vrEmu6522.git
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[submodule "submodules/sdcard"]
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path = submodules/sdcard
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url = https://github.com/visrealm/no-OS-FatFS-SD-SDIO-SPI-RPi-Pico.git
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[submodule "submodules/emu2149"]
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path = submodules/emu2149
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url = https://github.com/visrealm/emu2149.git

‎episodes/CMakeLists.txt‎

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add_subdirectory(ep00-intro)
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add_subdirectory(ep01-vga)
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add_subdirectory(ep02-tms)

‎episodes/ep00-intro/CMakeLists.txt‎

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set(EPISODE ep00-intro)
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add_subdirectory(${EPISODE}-00-blink)
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add_subdirectory(${EPISODE}-01-pio-blink)
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add_subdirectory(${EPISODE}-02-pio-dma-blink)

‎episodes/ep00-intro/ep00-intro-00-blink/CMakeLists.txt‎

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set(PROGRAM ${EPISODE}-00-blink)
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add_executable(${PROGRAM})
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target_sources(${PROGRAM} PRIVATE main.c)
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pico_add_extra_outputs(${PROGRAM})
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target_link_libraries(${PROGRAM} PRIVATE pico_stdlib)

‎episodes/ep00-intro/ep00-intro-00-blink/main.c‎

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/*
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* Project: pico-56 - episode 0
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*
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* Copyright (c) 2023 Troy Schrapel
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*
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* This code is licensed under the MIT license
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*
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* https://github.com/visrealm/pico-56
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*
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*/
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#include "pico/stdlib.h"
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int main(void)
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{
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// initialise the pin (standard io)
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gpio_init(PICO_DEFAULT_LED_PIN);
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// set as output
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gpio_set_dir(PICO_DEFAULT_LED_PIN, GPIO_OUT);
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while (1)
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{
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// on
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gpio_put(PICO_DEFAULT_LED_PIN, true);
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sleep_ms(500);
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// off
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gpio_put(PICO_DEFAULT_LED_PIN, false);
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sleep_ms(500);
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}
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return 0;
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}

‎episodes/ep00-intro/ep00-intro-01-pio-blink/CMakeLists.txt‎

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set(PROGRAM ${EPISODE}-01-pio-blink)
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add_executable(${PROGRAM})
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target_sources(${PROGRAM} PRIVATE main.c)
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# generate header file from pio
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pico_generate_pio_header(${PROGRAM} ${CMAKE_CURRENT_LIST_DIR}/blink.pio)
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pico_add_extra_outputs(${PROGRAM})
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target_link_libraries(${PROGRAM} PRIVATE pico_stdlib hardware_pio)

‎episodes/ep00-intro/ep00-intro-01-pio-blink/blink.pio‎

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/*
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* Project: pico-56
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*
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* Copyright (c) 2023 Troy Schrapel
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*
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* This code is licensed under the MIT license
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*
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* https://github.com/visrealm/pico-56
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*
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*/
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.program blink
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pull block
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.wrap_target
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set pins, 1
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mov x, osr
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onDelay:
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jmp x-- onDelay
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set pins, 0
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mov x, osr
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offDelay:
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jmp x-- offDelay
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.wrap
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% c-sdk {
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void blink_program_init(PIO pio, uint sm, uint offset, uint pin) {
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pio_gpio_init(pio, pin);
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pio_sm_set_consecutive_pindirs(pio, sm, pin, 1, true);
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pio_sm_config c = blink_program_get_default_config(offset);
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sm_config_set_set_pins(&c, pin, 1);
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pio_sm_init(pio, sm, offset, &c);
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}
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%}

‎episodes/ep00-intro/ep00-intro-01-pio-blink/main.c‎

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/*
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* Project: pico-56 - episode 0
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*
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* Copyright (c) 2023 Troy Schrapel
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*
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* This code is licensed under the MIT license
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*
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* https://github.com/visrealm/pico-56
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*
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*/
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#include "pico/stdlib.h"
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#include "hardware/pio.h"
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#include "hardware/clocks.h"
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#include "blink.pio.h"
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void blinkPinForever(PIO pio, uint offset, uint pin, float freq);
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int main() {
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uint offset = pio_add_program(pio0, &blink_program);
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blinkPinForever(pio0, offset, PICO_DEFAULT_LED_PIN, 4.0f);
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// here we can do whatever we want. the led will continue to blink
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return 0;
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}
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void blinkPinForever(PIO pio, uint offset, uint pin, float freq) {
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uint sm = pio_claim_unused_sm(pio, true);
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blink_program_init(pio, sm, offset, pin);
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pio_sm_set_enabled(pio, sm, true);
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uint delay = (uint)(clock_get_hz(clk_sys) / (2.0f * freq)) - 3.0f;
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pio_sm_put(pio, sm, delay);
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}

‎episodes/ep00-intro/ep00-intro-02-pio-dma-blink/CMakeLists.txt‎

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set(PROGRAM ${EPISODE}-02-pio-dma-blink)
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add_executable(${PROGRAM})
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target_sources(${PROGRAM} PRIVATE main.c)
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# generate header file from pio
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pico_generate_pio_header(${PROGRAM} ${CMAKE_CURRENT_LIST_DIR}/dma-blink.pio)
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pico_add_extra_outputs(${PROGRAM})
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target_link_libraries(${PROGRAM} PRIVATE pico_stdlib hardware_pio hardware_dma)

‎episodes/ep00-intro/ep00-intro-02-pio-dma-blink/dma-blink.pio‎

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/*
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* Project: pico-56
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*
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* Copyright (c) 2023 Troy Schrapel
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*
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* This code is licensed under the MIT license
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*
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* https://github.com/visrealm/pico-56
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*
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*/
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.program blink
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.wrap_target
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set pins, 1
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pull block
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mov x, osr
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onDelay:
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jmp x-- onDelay
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set pins, 0
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pull block
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mov x, osr
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offDelay:
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jmp x-- offDelay
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.wrap
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% c-sdk {
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void blink_program_init(PIO pio, uint sm, uint offset, uint pin) {
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pio_gpio_init(pio, pin);
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pio_sm_set_consecutive_pindirs(pio, sm, pin, 1, true);
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pio_sm_config c = blink_program_get_default_config(offset);
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sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
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sm_config_set_set_pins(&c, pin, 1);
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pio_sm_init(pio, sm, offset, &c);
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}
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%}

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