/** * Copyright (c) 2020 Raspberry Pi (Trading) Ltd. * * SPDX-License-Identifier: BSD-3-Clause */ #include <stdio.h> #include "pico/stdlib.h" #include "pico/util/queue.h" #include "pico/multicore.h" #define FLAG_VALUE 123 typedef struct { int32_t (*func)(int32_t); int32_t data; } queue_entry_t; queue_t call_queue; queue_t results_queue; void core1_entry() { while (1) { // Function pointer is passed to us via the queue_entry_t which also // contains the function parameter. // We provide an int32_t return value by simply pushing it back on the // return queue which also indicates the result is ready. queue_entry_t entry; queue_remove_blocking(&call_queue, &entry); int32_t result = entry.func(entry.data); queue_add_blocking(&results_queue, &result); } } int32_t factorial(int32_t n) { int32_t f = 1; for (int i = 2; i <= n; i++) { f *= i; } return f; } int32_t fibonacci(int32_t n) { if (n == 0) return 0; if (n == 1) return 1; int n1 = 0, n2 = 1, n3 = 0; for (int i = 2; i <= n; i++) { n3 = n1 + n2; n1 = n2; n2 = n3; } return n3; } #define TEST_NUM 10 int main() { int32_t res; stdio_init_all(); printf("Hello, multicore_runner using queues!\n"); // This example dispatches arbitrary functions to run on the second core // To do this we run a dispatcher on the second core that accepts a function // pointer and runs it. The data is passed over using the queue library from // pico_utils queue_init(&call_queue, sizeof(queue_entry_t), 2); queue_init(&results_queue, sizeof(int32_t), 2); multicore_launch_core1(core1_entry); queue_entry_t entry = {factorial, TEST_NUM}; queue_add_blocking(&call_queue, &entry); // We could now do a load of stuff on core 0 and get our result later queue_remove_blocking(&results_queue, &res); printf("Factorial %d is %d\n", TEST_NUM, res); // Now try a different function entry.func = fibonacci; queue_add_blocking(&call_queue, &entry); queue_remove_blocking(&results_queue, &res); printf("Fibonacci %d is %d\n", TEST_NUM, res); return 0; }

This firmware image was imported from the pico-examples repository. 


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