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copied!<p>Here is an example how to make C code completly unaware about what is actually used of HW for running the app. The main.c does the setup and then the free layer can be implemented on any compiler/arch. I think it is quite neat for abstracting C code a bit, so it does not get to be to spesific.</p> <p>Adding a complete compilable example here.</p> <pre><code>/* free.h */ #ifndef _FREE_H_ #define _FREE_H_ #include <stdio.h> #include <string.h> typedef unsigned char ubyte; typedef void (*F_ParameterlessFunction)() ; typedef void (*F_CommandFunction)(ubyte byte) ; void F_SetupLowerLayer ( F_ParameterlessFunction initRequest, F_CommandFunction sending_command, F_CommandFunction *receiving_command); #endif /* free.c */ static F_ParameterlessFunction Init_Lower_Layer = NULL; static F_CommandFunction Send_Command = NULL; static ubyte init = 0; void recieve_value(ubyte my_input) { if(init == 0) { Init_Lower_Layer(); init = 1; } printf("Receiving 0x%02x\n",my_input); Send_Command(++my_input); } void F_SetupLowerLayer ( F_ParameterlessFunction initRequest, F_CommandFunction sending_command, F_CommandFunction *receiving_command) { Init_Lower_Layer = initRequest; Send_Command = sending_command; *receiving_command = &recieve_value; } /* main.c */ int my_hw_do_init() { printf("Doing HW init\n"); return 0; } int my_hw_do_sending(ubyte send_this) { printf("doing HW sending 0x%02x\n",send_this); return 0; } F_CommandFunction my_hw_send_to_read = NULL; int main (void) { ubyte rx = 0x40; F_SetupLowerLayer(my_hw_do_init,my_hw_do_sending,&my_hw_send_to_read); my_hw_send_to_read(rx); getchar(); return 0; } </code></pre>

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