From 87e4480a590503b9b7feaf9c6d45089058c1eb95 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@mur.at>
Date: Tue, 17 Feb 2015 05:10:56 +0100
Subject: hhd70: getting/setting frequency

---
 software/avr.lib/cc1101.c          | 30 ++++++++++++++++++++++-----
 software/avr.lib/cc1101.h          |  3 +++
 software/hhd70dongle/hhd70dongle.c | 42 +++++++++++++++++++++++++++++++++++++-
 3 files changed, 69 insertions(+), 6 deletions(-)

diff --git a/software/avr.lib/cc1101.c b/software/avr.lib/cc1101.c
index 2023c01..9053417 100644
--- a/software/avr.lib/cc1101.c
+++ b/software/avr.lib/cc1101.c
@@ -32,7 +32,7 @@ static cc1101_driver_conf_t drv = {
   .spi_write_byte = NULL,
   .spi_read_byte = NULL,
   .spi_transfer_byte = NULL,
-  .freq_corr = 0.0
+  .freq_corr = 1.0
 };
 
 /*
@@ -103,10 +103,7 @@ void cc1101_init(cc1101_driver_conf_t conf)
 
 void cc1101_reg_init(void)
 {
-      // Set freq to 437.525 MHz
-  cc1101_spi_write_register(CC1101_REG_RW_FREQ2,0x10);   //Frequency Control Word, High Byte
-  cc1101_spi_write_register(CC1101_REG_RW_FREQ1,0xD3);   //Frequency Control Word, Middle Byte
-  cc1101_spi_write_register(CC1101_REG_RW_FREQ0,0xF0);   //Frequency Control Word, Low Byte
+      // TODO: init register depending on mode beacon vs. data
 }
 
 void cc1101_soft_reset(void)
@@ -119,6 +116,29 @@ void cc1101_powerdown(void)
   cc1101_spi_strobe_command(CC1101_CMD_SPWD);
 }
 
+void cc1101_set_freq_hz(uint32_t hz)
+{
+  uint32_t freq = (uint32_t)((float)hz / drv.freq_corr);
+  if(freq <= 0x3FFFFF)
+
+      // TODO: this is only allowed in idle mode
+  cc1101_spi_write_register(CC1101_REG_RW_FREQ0, freq & 0xFF);
+  cc1101_spi_write_register(CC1101_REG_RW_FREQ1, (freq >> 8) & 0xFF);
+  cc1101_spi_write_register(CC1101_REG_RW_FREQ2, (freq >> 16) & 0x3F);
+}
+
+uint32_t cc1101_get_freq_hz(void)
+{
+  uint32_t freq = 0;
+  freq = cc1101_spi_read_register(CC1101_REG_RW_FREQ2) & 0x3F;
+  freq = freq << 8;
+  freq |= cc1101_spi_read_register(CC1101_REG_RW_FREQ1);
+  freq = freq << 8;
+  freq |= cc1101_spi_read_register(CC1101_REG_RW_FREQ0);
+
+  return (uint32_t)((float)freq * drv.freq_corr);
+}
+
 static char* cc1101_config_reg_to_string(uint8_t addr)
 {
   switch(addr) {
diff --git a/software/avr.lib/cc1101.h b/software/avr.lib/cc1101.h
index c5690e0..2ac92bb 100644
--- a/software/avr.lib/cc1101.h
+++ b/software/avr.lib/cc1101.h
@@ -40,6 +40,9 @@ void cc1101_reg_init(void);
 void cc1101_soft_reset(void);
 void cc1101_powerdown(void);
 
+void cc1101_set_freq_hz(uint32_t hz);
+uint32_t cc1101_get_freq_hz(void);
+
 void cc1101_dump_register(void);
 
 #endif
diff --git a/software/hhd70dongle/hhd70dongle.c b/software/hhd70dongle/hhd70dongle.c
index 3db3c5c..2c239b4 100644
--- a/software/hhd70dongle/hhd70dongle.c
+++ b/software/hhd70dongle/hhd70dongle.c
@@ -44,7 +44,8 @@
 #include "cc1101.h"
 #include "cc1101_defines.h"
 
-#define DEFAULT_FREQ 437525
+#define DEFAULT_FREQ 437525000
+int32_t current_freq_hz = DEFAULT_FREQ;
 
 static void reset_hhd70(void)
 {
@@ -58,6 +59,32 @@ static void reinit_hhd70(void)
   cc1101_reg_init();
 }
 
+static uint32_t print_actual_freq(void)
+{
+  uint32_t f = cc1101_get_freq_hz();
+  uint16_t hz = f % 1000;
+  uint16_t mhz = f / 1000000;
+  uint16_t khz = (f % 1000000)/1000;
+  printf("actual frequency: %d.%03d%03d MHz\r\n", mhz, khz, hz);
+  return f;
+}
+
+static void update_current_freq(void)
+{
+  uint16_t hz = current_freq_hz % 1000;
+  uint16_t mhz = current_freq_hz / 1000000;
+  uint16_t khz = (current_freq_hz % 1000000)/1000;
+  printf("setting frequency to %d.%03d%03d MHz\r\n", mhz, khz, hz);
+
+      // TODO: goto idle mode
+
+  cc1101_set_freq_hz(current_freq_hz);
+
+      // TODO: if old mode wasn't idle go back to this mode
+
+  print_actual_freq();
+}
+
 static void print_status(void)
 {
   printf("HHD70 status:\r\n");
@@ -71,9 +98,22 @@ static void handle_cmd(uint8_t cmd)
   case '1': led_on(); printf("led ON\r\n"); break;
   case 't': led_toggle(); printf("led TOGGLE\r\n"); break;
   case '!': cc1101_soft_reset(); reset2bootloader(); break;
+
   case 'r': reset_hhd70(); break;
   case 'i': reinit_hhd70(); break;
+  case 'F': current_freq_hz = DEFAULT_FREQ; update_current_freq(); break;
+
+  case '#': current_freq_hz+=100000; update_current_freq(); break;
+  case '+': current_freq_hz+=10000; update_current_freq(); break;
+  case ':': current_freq_hz+=1000; update_current_freq(); break;
+  case '.': current_freq_hz-=1000; update_current_freq(); break;
+  case '-': current_freq_hz-=10000; update_current_freq(); break;
+  case '_': current_freq_hz-=100000; update_current_freq(); break;
+
   case 'P': cc1101_powerdown(); print_status(); break;
+
+  case 'f': print_actual_freq(); break;
+  case 's': print_status(); break;
   case 'D': cc1101_dump_register(); break;
 
   default: printf("unknown command\r\n"); return;
-- 
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