Add DS2482-100 Single-Channel 1-Wire Master driver

1 files changed, 58 insertions, 0 deletions

diff --git a/src/driver/ds2482.cc b/src/driver/ds2482.cc
new file mode 100644
index 0000000..92bd9dd
--- /dev/null
+++ b/src/driver/ds2482.cc
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2021 Daniel Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * DS2482-100 Single-Channel 1-Wire Master
+ */
+#include "driver/ds2482.h"
+#if defined(MULTIPASS_ARCH_HAS_I2C) && !defined(CONFIG_driver_softi2c)
+#include "driver/i2c.h"
+#else
+#include "driver/soft_i2c.h"
+#endif
+#include "arch.h"
+
+void DS2482::setup()
+{
+	txbuf[0] = 0xf0;
+	i2c.xmit(address, 1, txbuf, 0, rxbuf);
+	txbuf[0] = 0xd2;
+	txbuf[1] = 0xf0; // default setting: passive pull-up, standard speed
+	i2c.xmit(address, 2, txbuf, 0, rxbuf);
+}
+
+void DS2482::busReset()
+{
+	txbuf[0] = 0xb4;
+	i2c.xmit(address, 1, txbuf, 0, rxbuf);
+}
+
+unsigned char DS2482::status()
+{
+	txbuf[0] = 0xe1;
+	txbuf[0] = 0xf0;
+	i2c.xmit(address, 2, txbuf, 1, rxbuf);
+	return rxbuf[0];
+}
+
+void DS2482::readROM(unsigned char *data, unsigned char len)
+{
+	busReset();
+	arch.delay_ms(2); // reset low time (630us) + reset high time (614us)
+	txbuf[0] = 0xa5;
+	txbuf[1] = 0x33;
+	i2c.xmit(address, 2, txbuf, 0, rxbuf);
+	arch.delay_us(800);
+	for (unsigned char i = 0; i < len; i++) {
+		txbuf[0] = 0x96;
+		i2c.xmit(address, 1, txbuf, 0, rxbuf);
+		arch.delay_us(800);
+		txbuf[0] = 0xe1;
+		txbuf[1] = 0xe1;
+		i2c.xmit(address, 2, txbuf, 1, rxbuf);
+		data[i] = rxbuf[0];
+	}
+}
+
+DS2482 ds2482(0x18);