44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
/**
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* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <stdio.h>
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#include "pico/stdlib.h"
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#include "hardware/pio.h"
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#include "manchester_encoding.pio.h"
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// Manchester serial transmit/receive example. This transmits and receives at
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// 10 Mbps if sysclk is 120 MHz.
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// Need to connect a wire from GPIO2 -> GPIO3
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const uint pin_tx = 2;
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const uint pin_rx = 3;
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int main() {
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stdio_init_all();
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PIO pio = pio0;
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uint sm_tx = 0;
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uint sm_rx = 1;
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uint offset_tx = pio_add_program(pio, &manchester_tx_program);
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uint offset_rx = pio_add_program(pio, &manchester_rx_program);
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printf("Transmit program loaded at %d\n", offset_tx);
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printf("Receive program loaded at %d\n", offset_rx);
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manchester_tx_program_init(pio, sm_tx, offset_tx, pin_tx, 1.f);
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manchester_rx_program_init(pio, sm_rx, offset_rx, pin_rx, 1.f);
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pio_sm_set_enabled(pio, sm_tx, false);
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pio_sm_put_blocking(pio, sm_tx, 0);
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pio_sm_put_blocking(pio, sm_tx, 0x0ff0a55a);
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pio_sm_put_blocking(pio, sm_tx, 0x12345678);
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pio_sm_set_enabled(pio, sm_tx, true);
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for (int i = 0; i < 3; ++i)
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printf("%08x\n", pio_sm_get_blocking(pio, sm_rx));
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}
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