104 lines
2 KiB
C
104 lines
2 KiB
C
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#include "uart.h"
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#include <avr/io.h>
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#include "mystd.h"
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#include "utils.h"
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#define BAUD_RATE 115200
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#define UBRR_VALUE ((F_CPU / (8UL * BAUD_RATE)) - 1)
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// uart is 115200 baud rate, 8 bits per word, no parrity and 1 stop bit
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// 115200 8N1
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void uart_init(void) {
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// Set baud rate
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UBRR0H = (uint8_t)(UBRR_VALUE >> 8);
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UBRR0L = (uint8_t)(UBRR_VALUE);
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UCSR0A |= _BV(U2X0);
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// Enable transmitter
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UCSR0B = _BV(TXEN0) | _BV(RXEN0);
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// Set frame format: 8 data bits, no parity, 1 stop bit
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UCSR0C = _BV(UCSZ01) | _BV(UCSZ00);
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// Set TX (PD1) as output
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DDRD |= _BV(PD1);
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}
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void uart_tx(char data) {
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// wait for transmit buffer to be empty
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while (!(UCSR0A & _BV(UDRE0)))
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;
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// load data into transmit register
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UDR0 = data;
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}
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char uart_rx(void) {
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while (!(UCSR0A & _BV(RXC0)))
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;
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return UDR0;
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}
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void uart_sendstring(const char* str) {
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if (!str)
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return;
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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_send_u8(uint8_t val) {
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char buf[4] = {0, 0, 0, 0};
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uint8_t idx = 0;
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bool print = false;
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uint8_t modulus = 100;
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while (modulus) {
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uint8_t digit = val / modulus;
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if (print || digit != 0) {
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print = true;
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buf[idx++] = '0' + digit;
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}
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val %= modulus;
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modulus /= 10;
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}
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uart_sendstring(buf);
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}
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void uart_send_u16(uint16_t val) {
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char buf[6] = {0, 0, 0, 0, 0, 0};
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uint8_t idx = 0;
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bool print = false;
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uint16_t modulus = 10000;
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while (modulus) {
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uint8_t digit = val / modulus;
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if (print || digit != 0) {
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print = true;
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buf[idx++] = '0' + digit;
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}
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val %= modulus;
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modulus /= 10;
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}
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uart_sendstring(buf);
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}
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void uart_send_u8_hex(uint8_t val) {
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char buf[3] = {0, 0, 0};
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buf[0] = "0123456789abcdef"[(val >> 4) & 0x0F];
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buf[1] = "0123456789abcdef"[(val >> 0) & 0x0F];
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uart_sendstring(buf);
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}
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void uart_send_u16_hex(uint16_t val) {
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char buf[5] = {0, 0, 0, 0, 0};
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buf[0] = "0123456789abcdef"[(val >> 12) & 0x0F];
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buf[1] = "0123456789abcdef"[(val >> 8) & 0x0F];
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buf[2] = "0123456789abcdef"[(val >> 4) & 0x0F];
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buf[3] = "0123456789abcdef"[(val >> 0) & 0x0F];
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uart_sendstring(buf);
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}
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