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/*
* Copyright 2020 Daniel Friesel
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "driver/stdout.h"
#include <msp430.h>
/*
* Baud rate calculation according to datasheet:
* N := f_{BRCLK} / Baudrate = F_CPU / 115200 in our case
* if N <= 16: OS16 = 0, UCBR0 = int(N)
* if N > 16: OS16 = 1, UCBR0 = int(N/16), UCBRF0 = int(((n/16) - int(n/16)) * 16) = int(N)%16
* Set UCBRS0 according to table 21-4
*/
void StandardOutput::setup()
{
UCA0CTLW0 |= UCSWRST;
#if F_CPU == 16000000UL && F_UART == 115200UL
// 16M / 115200 == 138.88889 -> UCOS16 = 1, UCBR0 = 16, UCBRF0 = 10, UCBRS0 = 0xf7 ("0.8751"). -0.32% / 0.32% TX error
UCA0CTLW0 = UCSWRST | UCSSEL__SMCLK;
UCA0MCTLW = UCOS16 | (10<<4) | 0xF700;
UCA0BR0 = 8;
#elif F_CPU == 8000000UL && F_UART == 115200UL
// 8M / 115200 == 69.444444 -> UCOS16 = 1, UCBR0 = 4, UCBRF0 = 5, UCBRS0 = 0x55 ("0.4378"). -0.8% / 0.64% TX error
UCA0CTLW0 = UCSWRST | UCSSEL__SMCLK;
UCA0MCTLW = UCOS16 | (5<<4) | 0x5500;
UCA0BR0 = 4;
#elif F_CPU == 8000000UL && F_UART == 9600UL
UCA0CTLW0 = UCSWRST | UCSSEL__SMCLK;
UCA0MCTLW = UCOS16 | (1<<4) | 0x4900;
UCA0BR0 = 52;
#elif F_CPU == 4000000UL && F_UART == 115200UL
// 4M / 115200 == 34.722222 -> UCOS16 = 1, UCBR0 = 2, UCBRF0 = 2, UCBRS0 = 0xbb ("0.7147")
UCA0CTLW0 = UCSWRST | UCSSEL__SMCLK;
UCA0MCTLW = UCOS16 | (2<<4) | 0xbb00;
UCA0BR0 = 2;
#elif F_CPU == 1000000UL && F_UART == 115200UL
// 1M / 115200 == 8.6805556 -> UCOS16 = 0, UCBR0 = 8, UCBRF0 = 0, UCBRS0 = 0xd6 ("0.6667")
UCA0CTLW0 = UCSWRST | UCSSEL__SMCLK;
UCA0MCTLW = 0x5500;
UCA0BR0 = 8;
#elif F_CPU == 32768UL && F_UART == 9600UL
// Limited to 9600 Baud
// 32768 / 9600 == 3.413333 -> UCOS16 = 0, UCBR0 = 3, UCBRF0 = 0, UCBRS0 = 0x92 ("0.4003")
UCA0CTLW0 = UCSWRST | UCSSEL__SMCLK;
UCA0MCTLW = 0x9200;
UCA0BR0 = 3;
#else
#error Unsupported F_CPU and F_UART combination
#endif
UCA0IRCTL = 0;
UCA0ABCTL = 0;
P2SEL0 &= ~(BIT0 | BIT1);
P2SEL1 |= BIT0 | BIT1;
P2DIR |= BIT0;
UCA0CTLW0 &= ~UCSWRST;
#if 0
if (CSCTL5 & LFXTOFFG) {
kout << "! LFXT fault" << endl;
}
if (CSCTL5 & HFXTOFFG) {
kout << "! HFXT fault" << endl;
}
#endif
//UCA0IE |= UCRXIE;
}
void StandardOutput::put(char c)
{
while (!(UCA0IFG & UCTXIFG));
UCA0TXBUF = c;
if (c == '\n') {
put('\r');
}
}
StandardOutput kout;
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