Matthias Blankertz
7f8282315e
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The python and C modules that are supposed to be built into the firmware image (i.e. those that are in manifest.py or in USER_C_MODULES) have been moved to the software/modules directory. The software/src directory should now only contain python scripts and other files that should be installed to the Picos flash filesystem. The idea is that these should be those scripts that implement the application behaviour, as these are the ones that a user who does not want to build the whole firmware themself wants to modify.
60 lines
1.6 KiB
Plaintext
60 lines
1.6 KiB
Plaintext
// SPDX-License-Identifier: MIT
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// Copyright (c) 2024 Matthias Blankertz <matthias@blankertz.org>
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.program i2s_max98357
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.side_set 2
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.lang_opt python sideset_init = pico.PIO.OUT_LOW
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.lang_opt python out_init = pico.PIO.OUT_LOW
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.lang_opt python out_shiftdir = pcio.PIO.SHIFT_LEFT
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.lang_opt python autopull = True
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// data - DOUT
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// sideset - 2-BCLK, 1-LRCLK
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set x,15 side 0
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nop side 1
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startup_loop:
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nop side 2
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jmp x-- startup_loop side 3
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nop side 0
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set x, 14 side 1
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left_loop:
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.wrap_target
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out pins, 1 side 0
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jmp x-- left_loop side 1
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out pins, 1 side 2
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set x, 14 side 3
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right_loop:
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out pins, 1 side 2
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jmp x-- right_loop side 3
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out pins, 1 side 0
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set x, 14 side 1
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.wrap
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% c-sdk {
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#include "hardware/clocks.h"
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static inline void i2s_max98357_program_init(PIO pio, uint sm, uint offset, uint pin, uint sideset, uint samplerate) {
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pio_gpio_init(pio, pin);
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pio_gpio_init(pio, sideset);
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pio_gpio_init(pio, sideset+1);
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pio_sm_set_consecutive_pindirs(pio, sm, pin, 1, true);
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pio_sm_set_consecutive_pindirs(pio, sm, sideset, 2, true);
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pio_sm_config c = i2s_max98357_program_get_default_config(offset);
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sm_config_set_out_pins(&c, pin, 1);
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sm_config_set_sideset_pins(&c, sideset);
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sm_config_set_out_shift(&c, false, true, 32);
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sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
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const unsigned i2s_freq = samplerate * 2 * 16 * 2;
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const float div = clock_get_hz(clk_sys) / (float)i2s_freq;
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sm_config_set_clkdiv(&c, div);
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pio_sm_init(pio, sm, offset, &c);
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//pio_sm_set_enabled(pio, sm, true);
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}
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%}
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