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import { CPU } from './cpu';
import { AVRUSART, usart0Config } from './usart';
const FREQ_16MHZ = 16e6;
const FREQ_11_0529MHZ = 11059200;
describe('USART', () => {
it('should correctly calculate the baudRate from UBRR', () => {
const cpu = new CPU(new Uint16Array(1024));
const usart = new AVRUSART(cpu, usart0Config, FREQ_11_0529MHZ);
cpu.writeData(0xc5, 0); // UBRR0H <- 0
cpu.writeData(0xc4, 5); // UBRR0L <- 5
expect(usart.baudRate).toEqual(115200);
});
it('should correctly calculate the baudRate from UBRR in double-speed mode', () => {
const cpu = new CPU(new Uint16Array(1024));
const usart = new AVRUSART(cpu, usart0Config, FREQ_16MHZ);
cpu.writeData(0xc5, 3); // UBRR0H <- 3
cpu.writeData(0xc4, 64); // UBRR0L <- 64
cpu.writeData(0xc0, 2); // UCSR0A: U2X0
expect(usart.baudRate).toEqual(2400);
});
it('should return 5-bits per byte when UCSZ = 0', () => {
const cpu = new CPU(new Uint16Array(1024));
const usart = new AVRUSART(cpu, usart0Config, FREQ_16MHZ);
cpu.writeData(0xc0, 0);
expect(usart.bitsPerChar).toEqual(5);
});
it('should return 6-bits per byte when UCSZ = 1', () => {
const cpu = new CPU(new Uint16Array(1024));
const usart = new AVRUSART(cpu, usart0Config, FREQ_16MHZ);
cpu.writeData(0xc0, 0x2);
expect(usart.bitsPerChar).toEqual(6);
});
it('should return 7-bits per byte when UCSZ = 2', () => {
const cpu = new CPU(new Uint16Array(1024));
const usart = new AVRUSART(cpu, usart0Config, FREQ_16MHZ);
cpu.writeData(0xc0, 0x4);
expect(usart.bitsPerChar).toEqual(7);
});
it('should return 8-bits per byte when UCSZ = 3', () => {
const cpu = new CPU(new Uint16Array(1024));
const usart = new AVRUSART(cpu, usart0Config, FREQ_16MHZ);
cpu.writeData(0xc0, 0x6);
expect(usart.bitsPerChar).toEqual(8);
});
it('should return 9-bits per byte when UCSZ = 7', () => {
const cpu = new CPU(new Uint16Array(1024));
const usart = new AVRUSART(cpu, usart0Config, FREQ_16MHZ);
cpu.writeData(0xc0, 0x6);
cpu.writeData(0xc1, 0x4);
expect(usart.bitsPerChar).toEqual(9);
});
});
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