Unverified Commit b452e3f5 authored by Birte Kristina Friesel's avatar Birte Kristina Friesel
Browse files

MSP430FR5969: Add driver for UART output on eUSCI_A1 (stdout1)

parent 7f98f3fd

include/arch/msp430fr5969lp/driver/stdout1.h

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/*

 * Copyright 2020 Birte Kristina Friesel

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#ifndef STANDARDOUTPUT1_H

#define STANDARDOUTPUT1_H



#include "object/outputstream.h"



class StandardOutput1 : public OutputStream {

	private:

		StandardOutput1(const StandardOutput1 &copy);



	public:

		StandardOutput1 () {}

		void setup();



		virtual void put(char c) override;

};



extern StandardOutput1 kout1;



#endif

src/arch/msp430fr5969lp/Kconfig

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@@ -27,8 +27,16 @@ config arch_msp430fr5969lp_driver_spi 
bool "SPI on eUSCI_B0"

select meta_driver_spi



config arch_msp430fr5969lp_driver_stdout1

bool "UART Output on eUSCI_A1 / P2.5"

help

  TX: P2.5 (eUSCI_A1 / UCA1TXD)

select meta_driver_stdout1



config arch_msp430fr5969lp_driver_stdin

bool "UART Input"

bool "UART Input on eUSCI_A0 / P2.1"

help

  RX: P2.1 (eUSCI_A0 / UCA0RXD)

select meta_driver_stdin



config arch_msp430fr5969lp_driver_timer

src/arch/msp430fr5969lp/Makefile.inc

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@@ -75,8 +75,12 @@ ifdef CONFIG_arch_msp430fr5969lp_driver_adc 
	CXX_TARGETS += src/arch/msp430fr5969lp/driver/adc.cc

endif



ifdef CONFIG_arch_msp430fr5969lp_driver_dmx

	CXX_TARGETS += src/arch/msp430fr5969lp/driver/dmx.cc

ifdef CONFIG_arch_msp430fr5969lp_driver_dmx1

	CXX_TARGETS += src/arch/msp430fr5969lp/driver/dmx1.cc

endif



ifdef CONFIG_arch_msp430fr5969lp_driver_stdout1

	CXX_TARGETS += src/arch/msp430fr5969lp/driver/stdout1.cc

endif



ifdef CONFIG_arch_msp430fr5969lp_driver_stdin

src/arch/msp430fr5969lp/driver/stdout1.cc

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/*

 * Copyright 2020 Birte Kristina Friesel

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#include "driver/stdout1.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 StandardOutput1::setup()

{

	UCA1CTLW0 |= UCSWRST;

#if F_CPU == 16000000UL

	// 16M / 115200 == 138.88889 -> UCOS16 = 1, UCBR0 = 16, UCBRF0 = 10, UCBRS0 = 0xf7 ("0.8751")

	UCA1CTLW0 = UCSWRST | UCSSEL__SMCLK;

	UCA1MCTLW = UCOS16 | (10<<4) | 0xF700;

	UCA1BR0 = 8;

#elif F_CPU == 8000000UL

	// 8M / 115200 == 69.444444 -> UCOS16 = 1, UCBR0 = 4, UCBRF0 = 5, UCBRS0 = 0x55 ("0.4378")

	UCA1CTLW0 = UCSWRST | UCSSEL__SMCLK;

	UCA1MCTLW = UCOS16 | (5<<4) | 0x5500;

	UCA1BR0 = 4;

#elif F_CPU == 4000000UL

	// 4M / 115200 == 34.722222 -> UCOS16 = 1, UCBR0 = 2, UCBRF0 = 2, UCBRS0 = 0xbb ("0.7147")

	UCA1CTLW0 = UCSWRST | UCSSEL__SMCLK;

	UCA1MCTLW = UCOS16 | (2<<4) | 0xbb00;

	UCA1BR0 = 2;

#elif F_CPU == 1000000UL

	// 1M / 115200 == 8.6805556 -> UCOS16 = 0, UCBR0 = 8, UCBRF0 = 0, UCBRS0 = 0xd6 ("0.6667")

	UCA1CTLW0 = UCSWRST | UCSSEL__SMCLK;

	UCA1MCTLW = 0x5500;

	UCA1BR0 = 8;

#else

#error Unsupported F_CPU

#endif



	UCA1IRCTL = 0;

	UCA1ABCTL = 0;



	P2SEL0 &= ~BIT5;

	P2SEL1 |= BIT5;

	P2DIR |= BIT5;



	UCA1CTLW0 &= ~UCSWRST;

}



void StandardOutput1::put(char c)

{

	while (!(UCA1IFG & UCTXIFG));

	UCA1TXBUF = c;



	if (c == '\n') {

		put('\r');

	}

}



StandardOutput1 kout1;