From 9942173a2b46d5eb28fc41faf1627afc9929902d Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Mon, 22 Jun 2020 21:43:00 +0200
Subject: loratest app. TODO: move SerialOutput and SerialInput to separate
 class

Or rather: TODO: make stdin/stdout configurable so it also works for eUSCI_A1.
---
 src/app/loratest/Makefile.inc |   1 +
 src/app/loratest/main.cc      | 165 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 166 insertions(+)
 create mode 100644 src/app/loratest/Makefile.inc
 create mode 100644 src/app/loratest/main.cc

(limited to 'src')

diff --git a/src/app/loratest/Makefile.inc b/src/app/loratest/Makefile.inc
new file mode 100644
index 0000000..2cb8a42
--- /dev/null
+++ b/src/app/loratest/Makefile.inc
@@ -0,0 +1 @@
+loop ?= 1
diff --git a/src/app/loratest/main.cc b/src/app/loratest/main.cc
new file mode 100644
index 0000000..5b03425
--- /dev/null
+++ b/src/app/loratest/main.cc
@@ -0,0 +1,165 @@
+#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;
+}
-- 
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