stuff

core_comm.h

@@ -3,15 +3,16 @@
 #include <stdbool.h>
 #include <stdint.h>
 
-// The RP2350 multicore FIFO holds eight 32-bit messages in each direction.
+// The RP2350 multicore FIFO is physically 32 bits wide. Each logical 64-bit
+// message is transferred low word first, followed by its high word.
 // These functions intentionally enforce the sending/receiving core roles.
 
 // Try to send one word from core 1. Returns false instead of waiting when the
 // FIFO is full.
-bool core1_to_core0_try_write(uint32_t data);
+bool core1_to_core0_try_write(uint64_t data);
 
 // Send one word from core 1, waiting until core 0 has made FIFO space.
-void core1_to_core0_write_blocking(uint32_t data);
+void core1_to_core0_write_blocking(uint64_t data);
 
 // Try to read one word on core 0. Returns false when no message is available.
-bool core0_try_read_from_core1(uint32_t *data);
+bool core0_try_read_from_core1(uint64_t *data);