loratest app. TODO: move SerialOutput and SerialInput to separate class

loop ?= 1

#include "arch.h"

#include "driver/gpio.h"

#include "driver/stdout.h"

class SerialOutput : public OutputStream {

	private:

		SerialOutput(const SerialOutput &copy);

	public:

		SerialOutput () {}

		void setup();

		virtual void put(char c) override;

};

/*

 * 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 SerialOutput::setup()

{

	UCA1CTLW0 |= UCSWRST;

#if F_CPU == 16000000UL

	// 16M / 9600 == 1666.6667 -> UCOS16 = 1, UCBR0 = 104, UCBRF0 = 2, UCBRS0 = 0xd6 ("0.6667")

	UCA1CTLW0 = UCSWRST | UCSSEL__SMCLK;

	UCA1MCTLW = UCOS16 | (2<<4) | 0xd600;

	UCA1BR0 = 104;

#elif F_CPU == 8000000UL

	// 8M / 9600 == 833.3333 -> UCOS16 = 1, UCBR0 = 52, UCBRF0 = 1, UCBRS0 = 0x49 ("0.3335")

	UCA1CTLW0 = UCSWRST | UCSSEL__SMCLK;

	UCA1MCTLW = UCOS16 | (1<<4) | 0x4900;

	UCA1BR0 = 52;

#else

#error Unsupported F_CPU

#endif

	UCA1IRCTL = 0;

	UCA1ABCTL = 0;

	P2REN &= ~(BIT5 | BIT6);

	P2SEL0 &= ~(BIT5 | BIT6);

	P2SEL1 |= BIT5 | BIT6;

	UCA1CTLW0 &= ~UCSWRST;

	//UCA1IE |= UCRXIE;

}

void SerialOutput::put(char c)

{

	while (!(UCA1IFG & UCTXIFG));

	UCA1TXBUF = c;

	if (c == '\n') {

		put('\r');

	}

}

SerialOutput sout;

class SerialInput {

	private:

		SerialInput(const SerialInput &copy);

		char buffer[64];

		unsigned char write_pos, read_pos;

	public:

		SerialInput() : write_pos(0), read_pos(0) {}

		void setup();

		bool hasKey();

		char getKey();

		inline void addKey(char key) {

			buffer[write_pos++] = key;

			write_pos %= 64;

		}

};

void SerialInput::setup()

{

	UCA1IE |= UCRXIE;

}

bool SerialInput::hasKey()

{

	if (write_pos != read_pos) {

		return true;

	}

	return false;

}

char SerialInput::getKey()

{

	char ret = buffer[read_pos++];

	read_pos %= 64;

	return ret;

}

SerialInput sin;

__attribute__((interrupt(USCI_A1_VECTOR))) __attribute__((wakeup)) void handle_stdin()

{

	if (UCA1IFG & UCRXIFG) {

		sin.addKey(UCA1RXBUF);

	}

}

void loop(void)

{

	static unsigned int i = 0;

	gpio.led_off(0);

	// does not work on MSP430 3V3

	// works when connected to MSP430 5V0, AUX should be disconnected in that case

	// RX seems to work best without intermittent TX

	sout << "Hello! My value is " << i << endl;

	if (sin.hasKey()) {

		gpio.led_on(0);

		kout << "RX: ";

		while (sin.hasKey()) {

			kout << sin.getKey();

		}

		kout << endl;

	}

	i++;

}

int main(void)

{

	arch.setup();

	gpio.setup();

	kout.setup();

	sout.setup();

	sin.setup();

	gpio.led_on(1);

	// AUX

	gpio.input(GPIO::p4_2);

	// set module to sleep mode

	// M0

	gpio.output(GPIO::p2_4, 1);

	// M1

	gpio.output(GPIO::p4_3, 1);

	arch.delay_ms(100);

	sout << "\xc2\x00\x00\x1a\x17\x47";

	arch.delay_ms(50);

	gpio.write(GPIO::p2_4, 0);

	gpio.write(GPIO::p4_3, 0);

	arch.delay_ms(10);

	gpio.led_off(1);

	gpio.led_on(0);

	arch.idle_loop();

	return 0;

}