67 lines
1.3 KiB
Markdown
67 lines
1.3 KiB
Markdown
# AVR_ATMEGA_USART
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---
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## Description:
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This is a asynchronous serial program for the ATMEGA seiries of mcu. The sotfware
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is tested and working.
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Over time, I'm planning to add support for multiple AVR MCUs, however that
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may end up requiring more memory, so extensive of use of define macros will
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likely end up being the end result.
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## Features:
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- Multiple Baud Rates: 300, 600, 1200, 2400, 9600 ...
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- Asynchronous Receive and Transmit.
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- Optional Parity checking.
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- 7-8 data bits.
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- Hardware abstraction API
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- No Interrupt service routines required.
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- BSD-3 Licensing, aka you can use this for whatevery you want pretty much.
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## Instructions
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### Example 1
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```C
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#include "avr_usart.h"
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/*
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*Description: Echos a single char back to the term.
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*/
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void echo_char(char* cmd) {
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init_usart();
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unsigned char data[1] = "0";
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uint8_t data_len = 1;
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//clear the buffer
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serial0_flush_rxbuf();
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//receive the char.
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serial0_read(data, data_len);
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//Now echo it.
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serial0_write(data, data_len);
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}
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int main() {
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while(1) {
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echo_char();
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}
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}
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```
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## ISSUES:
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It's required to set the fuses in the chip for 8Mhz, otherwise a baud rate
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of 9600 will result in errors at a 7% rate.
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Another is that I need to design a standard naming scheme.
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