int platform_uart_set_buffer( unsigned id, unsigned log2size )
{
if( id == SERMUX_PHYS_ID ) // mere mortals aren't allowed to mess with VUART physical interface buffering
return PLATFORM_ERR;
#ifdef BUF_ENABLE_UART
if( log2size == 0 )
{
if( id >= SERMUX_SERVICE_ID_FIRST ) // Virtual UARTs need buffers no matter what
return PLATFORM_ERR;
// Disable buffering
buf_set( BUF_ID_UART, id, BUF_SIZE_NONE, BUF_DSIZE_U8 );
}
else
{
// Enable buffering
if( buf_set( BUF_ID_UART, id, log2size, BUF_DSIZE_U8 ) == PLATFORM_ERR )
return PLATFORM_ERR;
if( id >= SERMUX_SERVICE_ID_FIRST ) // No need for aditional setup on virtual UARTs
return PLATFORM_OK;
// Enable UART RX interrupt
if( platform_cpu_set_interrupt( INT_UART_RX, id, PLATFORM_CPU_ENABLE ) != PLATFORM_INT_OK )
return PLATFORM_ERR;
// Setup our C handler
if( elua_int_get_c_handler( INT_UART_RX ) != cmn_uart_rx_inthandler )
prev_uart_rx_handler = elua_int_set_c_handler( INT_UART_RX, cmn_uart_rx_inthandler );
}
return PLATFORM_OK;
#else // BUF_ENABLE_UART
return PLATFORM_ERR;
#endif // BUF_ENABLE_UART
}
// Common interrupt handling
void cmn_int_handler( elua_int_id id, elua_int_resnum resnum )
{
elua_int_add( id, resnum );
#ifdef BUILD_C_INT_HANDLERS
elua_int_c_handler phnd = elua_int_get_c_handler( id );
if( phnd )
phnd( resnum );
#endif
}
// Setup the serial multiplexer
void cmn_uart_setup_sermux()
{
// Enable UART RX interrupt
if( platform_cpu_set_interrupt( INT_UART_RX, SERMUX_PHYS_ID, PLATFORM_CPU_ENABLE ) == PLATFORM_INT_OK )
{
// Setup our C handler
if( elua_int_get_c_handler( INT_UART_RX ) != cmn_uart_rx_inthandler )
prev_uart_rx_handler = elua_int_set_c_handler( INT_UART_RX, cmn_uart_rx_inthandler );
}
else // We don't have a choice but to get stuck here, as we can't print an error anyway, since the console most likely lives on a virtual UART
while( 1 );
}