From 6e6bb662a9117567d0898d1795e943fe9117b666 Mon Sep 17 00:00:00 2001
From: Daniel Friesel <daniel.friesel@uos.de>
Date: Thu, 14 Oct 2021 16:12:17 +0200
Subject: Add Pervasive Aurora Mb E-Paper driver

---
 src/driver/Kconfig                |   4 ++
 src/driver/pervasive_aurora_mb.cc | 126 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 130 insertions(+)
 create mode 100644 src/driver/pervasive_aurora_mb.cc

(limited to 'src')

diff --git a/src/driver/Kconfig b/src/driver/Kconfig
index 3c96d9e..b2d57e9 100644
--- a/src/driver/Kconfig
+++ b/src/driver/Kconfig
@@ -72,6 +72,10 @@ config driver_nrf24l01
 bool "nRF24L01+ 2.4GHz Radio"
 depends on meta_driver_spi
 
+config driver_pervasive_aurora_mb
+bool "Pervasive Aurora Mb"
+depends on ( arch_msp430fr5969lp || arch_msp430fr5994lp ) && meta_driver_spi
+
 # resistive_load is AEMR-specific and not included in Kconfig
 
 # s5851a is broken and incomplete
diff --git a/src/driver/pervasive_aurora_mb.cc b/src/driver/pervasive_aurora_mb.cc
new file mode 100644
index 0000000..c244a72
--- /dev/null
+++ b/src/driver/pervasive_aurora_mb.cc
@@ -0,0 +1,126 @@
+/*
+ * Copyright 2021 Daniel Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Driver for Pervasive Aurora Mb E-Paper displays with internal Timing
+ * Controller (iTC). Configured for the 300x400px 4.2" variant.
+ */
+#include "driver/pervasive_aurora_mb.h"
+#include "driver/spi.h"
+#include "driver/gpio.h"
+#include "arch.h"
+
+void PervasiveAuroraMb::setup()
+{
+	gpio.output(PERVASIVE_AURORA_RESET_PIN, 0);
+	gpio.output(PERVASIVE_AURORA_CS_PIN, 0);
+	gpio.output(PERVASIVE_AURORA_DC_PIN, 0);
+	gpio.output(PERVASIVE_AURORA_VCC_PIN, 0);
+	gpio.input(PERVASIVE_AURORA_BUSY_PIN);
+}
+
+void PervasiveAuroraMb::powerOn()
+{
+	gpio.write(PERVASIVE_AURORA_VCC_PIN, 1);
+	arch.delay_ms(5);
+	gpio.write(PERVASIVE_AURORA_RESET_PIN, 1);
+	arch.delay_ms(1);
+	gpio.write(PERVASIVE_AURORA_CS_PIN, 1);
+}
+
+void PervasiveAuroraMb::initialize(signed char temperature)
+{
+	// "Input Temperature"
+	spiWrite(0xe5, (const unsigned char*)&temperature, 1);
+
+	// "Active Temperature"
+	spiWrite(0xe0, (const unsigned char[]){0x02}, 1);
+
+	// "Panel Settings"
+	spiWrite(0x00, (const unsigned char[]){0x0f}, 1);
+
+	// "Panel Settings"
+	spiWrite(0x00, (const unsigned char[]){0x0f}, 1);
+
+	// "Booster soft start settings"
+	spiWrite(0x06, (const unsigned char[]){0x17, 0x17, 0x27}, 3);
+
+	// "Resolution settings": 300 x 400 -> 0x12c x 0x190
+	spiWrite(0x61, (const unsigned char[]){0x01, 0x90, 0x01, 0x2c}, 4);
+
+	// "Vcom and data interval setting"
+	spiWrite(0x50, (const unsigned char[]){0x87}, 1);
+
+	// "Power Saving"
+	spiWrite(0xe3, (const unsigned char[]){0x88}, 1);
+}
+
+void PervasiveAuroraMb::sendImage(unsigned char *frame)
+{
+	unsigned char null_int[2] = {0x00, 0x00};
+	spiWrite(0x10, 0, 0);
+
+	gpio.write(PERVASIVE_AURORA_CS_PIN, 0);
+	spi.xmit(300*(400/8), frame, 0, frame);
+	gpio.write(PERVASIVE_AURORA_CS_PIN, 1);
+
+	/*
+	 * Second Pass: All zeroes (-> update entire display).
+	 * A 1 bit indicates that the corresponding pixel should be skipped.
+	 */
+	spiWrite(0x13, 0, 0);
+	gpio.write(PERVASIVE_AURORA_CS_PIN, 0);
+	for (unsigned int i = 0; i < 300*(400/16); i++) {
+		spi.xmit(2, null_int, 0, frame);
+	}
+	gpio.write(PERVASIVE_AURORA_CS_PIN, 1);
+}
+
+void PervasiveAuroraMb::sendUpdate()
+{
+	while (isBusy()) ;
+
+	spiWrite(0x04, 0, 0);
+
+	while (isBusy()) ;
+
+	spiWrite(0x12, 0, 0);
+
+	while (isBusy()) ;
+}
+
+void PervasiveAuroraMb::powerOff()
+{
+	spiWrite(0x02, 0, 0);
+	while (isBusy()) ;
+	gpio.output(PERVASIVE_AURORA_RESET_PIN, 0);
+	gpio.output(PERVASIVE_AURORA_CS_PIN, 0);
+	gpio.output(PERVASIVE_AURORA_DC_PIN, 0);
+	gpio.output(PERVASIVE_AURORA_VCC_PIN, 0);
+}
+
+bool PervasiveAuroraMb::isBusy()
+{
+	return !gpio.read(PERVASIVE_AURORA_BUSY_PIN);
+}
+
+void PervasiveAuroraMb::spiWrite(unsigned char reg, const unsigned char *txbuf, unsigned int length)
+{
+	gpio.write(PERVASIVE_AURORA_DC_PIN, 0);
+	gpio.write(PERVASIVE_AURORA_CS_PIN, 0);
+
+	spi.xmit(1, &reg, 0, 0);
+
+	gpio.write(PERVASIVE_AURORA_CS_PIN, 1);
+	gpio.write(PERVASIVE_AURORA_DC_PIN, 1);
+
+	if (length) {
+		arch.delay_us(1);
+		gpio.write(PERVASIVE_AURORA_CS_PIN, 0);
+		spi.xmit(length, (unsigned char*)txbuf, 0, 0);
+		gpio.write(PERVASIVE_AURORA_CS_PIN, 1);
+	}
+}
+
+PervasiveAuroraMb pervasiveAuroraMb;
-- 
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