84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
#include "header.h"
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// MACROS
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// USART
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#define USART_BAUDRATE 115200
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#define INPUT_SIZE 7
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// GLOBAL VARIABLES
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//
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// FUNCTIONS
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//
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void uart_init() {
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UBRR0H = (unsigned char) (BAUD_PRESCALER(USART_BAUDRATE) >> 8); // 20.11.5 : UBRRnL and UBRRnH – USART Baud Rate Registers
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UBRR0L = (unsigned char) BAUD_PRESCALER(USART_BAUDRATE);
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UCSR0C = DATA_EIGHT_BIT; // 20.11.4 : set Frame Format
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UCSR0B = TRANSMITTER_ENABLED; // 20.11.3 : enable Receiver, Transmitter, and interrupts
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}
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// char uart_rx(void) {
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// while (!TEST(UCSR0A, RXC0)); // 20.11.2 : do nothing until there are unread data in the receive buffer (UDRn), (RXCn flag in UCSRnA register set to 1 when buffer has data)
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// return UDR0; // 20.11.1 : get data in buffer, UDRn – USART I/O Data Register (read and write)
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// }
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void uart_tx(char c) {
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while (!TEST(UCSR0A, UDRE0)); // 20.11.2 : do nothing until UDRn buffer is empty, (UDREn flag in UCSRnA register set to 1 when buffer empty)
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UDR0 = (unsigned char) c; // 20.11.1 : Put data into buffer, UDRn – USART I/O Data Register (read and write)
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}
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void uart_printstr(const char* str) {
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while (*str) {
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uart_tx(*str);
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str++;
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}
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}
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void uart_printstr_endl(const char* str) {
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uart_printstr(str);
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uart_printstr("\r\n");
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}
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void uart_printstr_itoa_base(uint64_t value) {
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char buffer[17] = {0};
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int_to_string((uint16_t)value, buffer);
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uart_printstr(buffer);
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}
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// ISR(USART_RX_vect) { // Table 12-6 : we select the code for USART Receive
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// char received_char = UDR0; // read received character
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// if (received_char == '\b' || received_char == 127) { // if backspace is received
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// if (input_index <= 0) {
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// return;
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// }
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// if (input_index >= INPUT_SIZE) {
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// return;
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// }
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// remove_last_character();
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// input_index--;
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// uart_tx('\b'); // Move cursor back
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// uart_tx(' '); // Erase the character on screen
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// uart_tx('\b'); // Move cursor back again
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// } else if (received_char == '\n' || received_char == '\r') { // if enter is received
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// if (input_index != INPUT_SIZE) {
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// return;
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// }
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// set_color((char *)color_input);
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// reset_input();
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// } else { // any other character
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// if (input_index >= INPUT_SIZE) {
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// return;
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// }
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// if (!is_valid_color_input(received_char)) {
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// return;
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// }
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// fill_str(received_char);
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// uart_tx(received_char);
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// input_index++;
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// }
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// }
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// ISR(USART_TX_vect) { // Table 12-6 : we select the code for USART Transmit
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// char received_char = UDR0; // read received character
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// }
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