#include <in430.h>
#include <intrinsics.h>
#include <msp430f1611.h>
#include <stdint.h>

void init();

int main(void) {
    WDTCTL = WDTPW | WDTHOLD;   // Stop watchdog timer

    init();
    U0TXBUF = '\n';
    while(1) {
        int i=0;
        for(;i<10000;i++);
    }
}


const char stringtosent[] = { "Hello World\r\n" };
char recvBuffer[5];

inline void init() {
    P3SEL |= 0x30;
    U0CTL |= SWRST;
    U0CTL |= CHAR; // 8-bit character
    U0TCTL |= SSEL1;
    BCSCTL2 |= SELS;
    ME1 |= UTXE0 | URXE0; // Enabled USART0 TXD RXD

    // Ustawienia dla 115200
    U0BR0 = 0x40;
    U0BR1 = 0x00;
    U0MCTL = 0x4A;
    U0CTL &= ~SWRST; // Wylaczenie software reset

    // DMA0 transmiting
    DMACTL0 |= DMA0TSEL_4; // transmit trigger transmit
    DMA0SA = (unsigned int)stringtosent; // Source block address
    DMA0DA = (unsigned int)&U0TXBUF; // Dest single address
    DMA0SZ = sizeof stringtosent-1; // Block size
    DMA0CTL |= DMASRCINCR_3 + DMASRCBYTE + DMADSTBYTE + DMALEVEL + DMAIE; // increment source, byte in, byte out, level triggered

    // DMA1 recv
    DMACTL0 |= DMA1TSEL_3; // recv trigger recv
    DMA1SA = (unsigned int)&U0RXBUF; // Source block address
    DMA1DA = (unsigned int)recvBuffer; // Dest single address
    DMA1SZ = sizeof recvBuffer-1; // Block size
    DMA1CTL |= DMADSTINCR_3 + DMASRCBYTE + DMADSTBYTE + DMALEVEL + DMAIE + DMAEN; // increment source, byte in, byte out, level triggered

    _EINT();
}

#pragma vector=DACDMA_VECTOR
__interrupt void dmaisr(void)
{
    if (DMA1CTL & DMAIFG) {
        DMA1CTL &= ~DMAIFG;
        DMA0SA = (unsigned int)recvBuffer; // Source block address
        DMA0DA = (unsigned int)&U0TXBUF; // Dest single address
        DMA0SZ = sizeof recvBuffer-1; // Block size
        DMA0CTL |= DMAEN;
    }
    if(DMA0CTL & DMAIFG) {
        DMA0CTL &= ~DMAIFG;
        DMA1CTL |= DMAEN; // Enable read again
    }
}