62 lines
2.0 KiB
C
62 lines
2.0 KiB
C
/**
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* Copyright (c) 2021 mjcross
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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 "nec_transmit.h" // include the library headers
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#include "nec_receive.h"
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// Infrared loopback example ('NEC' format)
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//
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// Need to connect an IR LED to GPIO 14 via a suitable series resistor (e.g. 1.5k)
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// and an active-low IR detector to GPIO 15 (e.g. VS1838b)
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//
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// Output is sent to stdout
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int main() {
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stdio_init_all();
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PIO pio = pio0; // choose which PIO block to use (RP2040 has two: pio0 and pio1)
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uint tx_gpio = 14; // choose which GPIO pin is connected to the IR LED
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uint rx_gpio = 15; // choose which GPIO pin is connected to the IR detector
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// configure and enable the state machines
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int tx_sm = nec_tx_init(pio, tx_gpio); // uses two state machines, 16 instructions and one IRQ
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int rx_sm = nec_rx_init(pio, rx_gpio); // uses one state machine and 9 instructions
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if (tx_sm == -1 || rx_sm == -1) {
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printf("could not configure PIO\n");
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return -1;
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}
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// transmit and receive frames
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uint8_t tx_address = 0x00, tx_data = 0x00, rx_address, rx_data;
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while (true) {
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// create a 32-bit frame and add it to the transmit FIFO
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uint32_t tx_frame = nec_encode_frame(tx_address, tx_data);
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pio_sm_put(pio, tx_sm, tx_frame);
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printf("\nsent: %02x, %02x", tx_address, tx_data);
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// allow time for the frame to be transmitted (optional)
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sleep_ms(100);
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// display any frames in the receive FIFO
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while (!pio_sm_is_rx_fifo_empty(pio, rx_sm)) {
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uint32_t rx_frame = pio_sm_get(pio, rx_sm);
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if (nec_decode_frame(rx_frame, &rx_address, &rx_data)) {
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printf("\treceived: %02x, %02x", rx_address, rx_data);
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} else {
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printf("\treceived: %08x", rx_frame);
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}
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}
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sleep_ms(900);
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tx_data += 1;
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}
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}
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