1 files changed, 135 insertions, 0 deletions
diff --git a/src/app/lora32u4ii/main.cc b/src/app/lora32u4ii/main.cc
new file mode 100644
index 0000000..b44652b
--- /dev/null
+++ b/src/app/lora32u4ii/main.cc
@@ -0,0 +1,135 @@
+/*
+ * Copyright 2021 Daniel Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#include "arch.h"
+#include "driver/gpio.h"
+#include "driver/stdout.h"
+#include "driver/uptime.h"
+#include "driver/adc.h"
+#include "driver/spi.h"
+
+#define CFG_eu868 1
+#define CFG_sx1276_radio 1
+
+#include "radio.h"
+#include "oslmic.h"
+
+unsigned char txbuf[4];
+unsigned char rxbuf[4];
+
+// DIYMall BSFrance LoRa32u4 II v1.3
+// See also: arduino packages/adafruit/hardware/avr/1.4.13/variants/feather32u4/pins_arduino.h
+// PB0 -> Charger enable and Vbat/2 measurement voltage divider enable
+// PB0 is also the !SS pin, so it must be configured as output in order to use SPI.
+// PB5 "D9" <- Vbat/2 via voltage divider. Appears to also have a connection to the user LED
+// PC7 "D13" -> User LED
+const GPIO::Pin rstpin = GPIO::pd4; // "D4" -> RST
+const GPIO::Pin  cspin = GPIO::pb4; // "D8" -> NSS
+const GPIO::Pin dio0pin = GPIO::pe6; // "D7" <- DIO0 / IRQ
+const GPIO::Pin dio1pin = GPIO::pc6; // "D5" <- DIO1
+
+static void writeReg (u1_t addr, u1_t data) {
+	txbuf[0] = addr | 0x80;
+	txbuf[1] = data;
+	gpio.write(cspin, 0);
+	spi.xmit(2, txbuf, 0, rxbuf);
+	gpio.write(cspin, 1);
+}
+
+static u1_t readReg (u1_t addr) {
+	txbuf[0] = addr & 0x7f;
+	gpio.write(cspin, 0);
+	spi.xmit(1, txbuf, 2, rxbuf);
+	gpio.write(cspin, 1);
+	return rxbuf[1];
+}
+/*
+static void writeBuf (u1_t addr, xref2u1_t buf, u1_t len) {
+	txbuf[0] = addr | 0x80;
+	for (uint8_t i = 0; i < len; i++) {
+		txbuf[i+1] = buf[i];
+	}
+	spi.xmit(len+1, txbuf, 0, rxbuf);
+}
+
+static void readBuf (u1_t addr, xref2u1_t buf, u1_t len) {
+	txbuf[0] = addr & 0x7f;
+	spi.xmit(1, txbuf, len, buf);
+}
+*/
+
+static void writeOpmode(u1_t mode) {
+	u1_t const maskedMode = mode & OPMODE_MASK;
+	writeReg(RegOpMode, mode);
+}
+
+static void opmode (u1_t mode) {
+	writeOpmode((readReg(RegOpMode) & ~OPMODE_MASK) | mode);
+}
+
+
+
+bool radio_init()
+{
+	// requestModuleActive(1); not required for sx yadayada
+	gpio.output(cspin, 1);
+#ifdef CFG_sx1276_radio
+	gpio.output(rstpin, 0);
+#else
+	gpio.output(rstpin, 1);
+#endif
+	arch.delay_ms(1);
+	gpio.input(rstpin);
+	gpio.write(rstpin, 0); // disable pull-up
+	arch.delay_ms(5);
+	opmode(OPMODE_SLEEP);
+
+	u1_t v = readReg(RegVersion);
+#ifdef CFG_sx1276_radio
+	if(v != 0x12 ) {
+		kout << "Radio version mismatch: expected " << hex << 0x12 << ", got " << v << endl;
+		return false;
+	}
+#elif CFG_sx1272_radio
+	if(v != 0x22) {
+		kout << "Radio version mismatch: expected " << hex << 0x22 << ", got " << v << endl;
+		return false;
+	}
+#else
+#error Missing CFG_sx1272_radio/CFG_sx1276_radio
+#endif
+	return true;
+}
+
+void loop(void)
+{
+	//gpio.led_toggle(1);
+#ifdef TIMER_S
+	kout << dec << uptime.get_s() << endl;
+#else
+	kout << "beep boop" << endl;
+#endif
+	kout << "VCC  = " << adc.getVCC_mV() << " mV" << endl;
+	kout << "Vbat = " << adc.getVBat_mV(false) << " mV" << endl;
+	gpio.led_toggle(0);
+}
+
+int main(void)
+{
+	arch.setup();
+	gpio.setup();
+	kout.setup();
+	spi.setup();
+	gpio.input(GPIO::pb5);
+
+	radio_init();
+
+	kout << "Hello, World!" << endl;
+	kout << "Test, World!" << endl;
+
+	arch.idle_loop();
+
+	return 0;
+}