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Update uart.c #36

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Update uart.c #36

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21 changes: 17 additions & 4 deletions uart/uart.c
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Original file line number Diff line number Diff line change
Expand Up @@ -19,11 +19,24 @@
#define PGM_READ_BYTE(x) pgm_read_byte(x)
#endif

// Just enable the UART Tx and set baud rate for 38400 on 3.6864MHz (STK500)
// Just enable the UART Tx and set baud rate for 9600 on F_CPU
// https://www.electronicwings.com/avr-atmega/atmega1632-usart

void UART_init(void) {
UCSRB = (1 << TXEN0);
UBRRL = USE_UART; // SEE HERE: http://wormfood.net/avrbaudcalc.php
#define USART_BAUDRATE 9600
#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1)

void UART_init(void)
{
#ifdef USE_UART
UCSRB |= (1 << TXEN0); /* Turn on transmission and reception */
//UCSRC |= (1 << URSEL) | (1 << UCSZ0) | (1 << UCSZ1);/* Use 8-bit char size */
UBRRL = BAUD_PRESCALE; /* Load lower 8-bits of the baud rate */
UBRRH = (BAUD_PRESCALE >> 8); /* Load upper 8-bits*/
/*
UCSRB = (1 << TXEN0);
UBRRL = USE_UART; // SEE HERE: http://wormfood.net/avrbaudcalc.php
*/
#endif
}

// The classic Tx one character routine
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