volatile uint8_t uart0_buffer_items = 0;
volatile uint8_t uart0_buffer[uart0_buffer_size];
+volatile uint8_t uart_configured = 0;
+
+
// ----- Interrupt Functions -----
}
+
// ----- Functions -----
void uart_serial_setup()
{
+ // Indication that the UART is not ready yet
+ uart_configured = 0;
+
// Setup the the UART interface for keyboard data input
SIM_SCGC4 |= SIM_SCGC4_UART0; // Disable clock gating
// Add interrupt to the vector table
NVIC_ENABLE_IRQ( IRQ_UART0_STATUS );
+
+ // UART is now ready to use
+ uart_configured = 1;
}
// Get the next character, or -1 if nothing received
int uart_serial_getchar()
{
+ if ( !uart_configured )
+ return -1;
+
unsigned int value = -1;
// Check to see if the FIFO has characters
// Transmit a character. 0 returned on success, -1 on error
int uart_serial_putchar( uint8_t c )
{
+ if ( !uart_configured )
+ return -1;
+
while ( !( UART0_SFIFO & UART_SFIFO_TXEMPT ) ); // Wait till there is room to send
UART0_D = c;
int uart_serial_write( const void *buffer, uint32_t size )
{
+ if ( !uart_configured )
+ return -1;
+
const uint8_t *data = (const uint8_t *)buffer;
uint32_t position = 0;