rda1826dongle: added register write and read subs (not working yet)

git-svn-id: https://svn.spreadspace.org/mur.sat@683 7de4ea59-55d0-425e-a1af-a3118ea81d4c

1 files changed, 83 insertions, 0 deletions

diff --git a/software/rda1846dongle/rda1846.c b/software/rda1846dongle/rda1846.c
new file mode 100644
index 0000000..f12c40f
--- /dev/null
+++ b/software/rda1846dongle/rda1846.c
@@ -0,0 +1,83 @@
+/*
+ *  spreadspace avr utils
+ *
+ *
+ *  Copyright (C) 2013 Christian Pointner <equinox@spreadspace.org>
+ *                     Othmar Gsenger <otti@wirdorange.org>
+ *
+ *  This file is part of spreadspace avr utils.
+ *
+ *  spreadspace avr utils is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  any later version.
+ *
+ *  spreadspace avr utils is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "LUFA/Drivers/Peripheral/TWI.h"
+#include <stdio.h>
+
+#include "rda1846.h"
+
+#define RDA1846_CHIP_ADDR  0xE2
+#define RDA1846_ADDR_W    (0<<7)
+#define RDA1846_ADDR_R    (1<<7)
+
+uint8_t rda1846_write_register(const uint8_t addr, const uint16_t data)
+{
+  if(TWI_StartTransmission(RDA1846_CHIP_ADDR | TWI_ADDRESS_WRITE,10) != TWI_ERROR_NoError)
+    return 1;
+
+  if(addr >= 0x7F)
+    goto i2c_error; // no support for this at the moment !!!
+
+  if(!TWI_SendByte(addr | RDA1846_ADDR_W))
+    goto i2c_error;
+  if(!TWI_SendByte((uint8_t)(data>>8)))
+    goto i2c_error;
+  if(!TWI_SendByte((uint8_t)data))
+    goto i2c_error;
+
+  TWI_StopTransmission();
+  return 0;
+
+i2c_error:
+  TWI_StopTransmission();
+  return 1;
+}
+
+uint8_t rda1846_read_register(const uint8_t addr, uint16_t* data)
+{
+  if(TWI_StartTransmission(RDA1846_CHIP_ADDR | TWI_ADDRESS_WRITE,10) != TWI_ERROR_NoError)
+    return 1;
+
+  if(addr >= 0x7F)
+    goto i2c_error; // no support for this at the moment !!!
+
+  if(!TWI_SendByte(addr | RDA1846_ADDR_R))
+    goto i2c_error;
+
+  if(TWI_StartTransmission(RDA1846_CHIP_ADDR | TWI_ADDRESS_READ,10) != TWI_ERROR_NoError)
+    goto i2c_error;
+
+      // TODO read data
+
+  TWI_StopTransmission();
+  return 0;
+
+i2c_error:
+  TWI_StopTransmission();
+  return 1;
+}
+
+void rda1846_init(void)
+{
+  TWI_Init(TWI_BIT_PRESCALE_1, TWI_BITLENGTH_FROM_FREQ(1, 200000));
+}