Add video Pre-ADC gain setting

software/sys_controller/ossc/av_controller.c

@@ -339,7 +339,7 @@ status_t get_status(tvp_input_t input, video_format format)
         tvp_set_sync_lpf(tc.sync_lpf);
 
     if (memcmp(&tc.col, &cm.cc.col, sizeof(color_setup_t)))
-        tvp_set_fine_gain_offset(&tc.col);
+        tvp_set_gain_offset(&tc.col);
 
 #ifdef ENABLE_AUDIO
     if ((tc.audio_dw_sampl != cm.cc.audio_dw_sampl) ||

software/sys_controller/ossc/avconfig.c

@@ -59,6 +59,7 @@ const avconfig_t tc_default = {
         .r_f_off = DEFAULT_FINE_OFFSET,
         .g_f_off = DEFAULT_FINE_OFFSET,
         .b_f_off = DEFAULT_FINE_OFFSET,
+        .c_gain = DEFAULT_COARSE_GAIN,
     },
     .link_av = AV_LAST,
 };

software/sys_controller/ossc/avconfig.h

@@ -36,6 +36,7 @@
 #define SD_SYNC_WIN_MAX     255
 #define PLL_COAST_MAX       5
 #define REVERSE_LPF_MAX     31
+#define COARSE_GAIN_MAX     15
 
 #define SL_MODE_MAX         2
 #define SL_TYPE_MAX         2

software/sys_controller/ossc/menu.c

@@ -80,6 +80,7 @@ static void lt_disp(alt_u8 v) { strncpy(menu_row2, lt_desc[v], LCD_ROW_LEN+1); }
 static void aud_db_disp(alt_u8 v) { sniprintf(menu_row2, LCD_ROW_LEN+1, "%d dB", ((alt_8)v-AUDIO_GAIN_0DB)); }
 static void vm_display_name (alt_u8 v) { strncpy(menu_row2, video_modes[v].name, LCD_ROW_LEN+1); }
 static void link_av_desc (avinput_t v) { strncpy(menu_row2, v == AV_LAST ? "No link" : avinput_str[v], LCD_ROW_LEN+1); }
+static void coarse_gain_disp(alt_u8 v) { sniprintf(menu_row2, LCD_ROW_LEN+1, "%u.%u", ((v*10)+50)/100, (((v*10)+50)%100)/10); }
 
 static const arg_info_t vm_arg_info = {&vm_sel, VIDEO_MODES_CNT-1, vm_display_name};
 static const arg_info_t profile_arg_info = {&profile_sel_menu, MAX_PROFILE, value_disp};
@@ -106,6 +107,7 @@ MENU(menu_vinputproc, P99_PROTECT({ \
     { LNG("R/Pr gain","R/Pr ｹﾞｲﾝ"),             OPT_AVCONFIG_NUMVALUE,  { .num = { &tc.col.r_f_gain,  OPT_NOWRAP, 0, 0xFF, value_disp } } },
     { LNG("G/Y gain","G/Y ｹﾞｲﾝ"),               OPT_AVCONFIG_NUMVALUE,  { .num = { &tc.col.g_f_gain,  OPT_NOWRAP, 0, 0xFF, value_disp } } },
     { LNG("B/Pb gain","B/Pb ｹﾞｲﾝ"),             OPT_AVCONFIG_NUMVALUE,  { .num = { &tc.col.b_f_gain,  OPT_NOWRAP, 0, 0xFF, value_disp } } },
+    { LNG("Pre-ADC Gain","Pre-ADC Gain"),       OPT_AVCONFIG_NUMVALUE,  { .num = { &tc.col.c_gain,    OPT_NOWRAP, 0, COARSE_GAIN_MAX, coarse_gain_disp } } },
 }))
 
 MENU(menu_sampling, P99_PROTECT({ \

software/sys_controller/tvp7002/tvp7002.c

@@ -151,6 +151,7 @@ void tvp_init()
         .r_f_off = DEFAULT_FINE_OFFSET,
         .g_f_off = DEFAULT_FINE_OFFSET,
         .b_f_off = DEFAULT_FINE_OFFSET,
+        .c_gain = DEFAULT_COARSE_GAIN,
     };
 
     // disable output
@@ -201,20 +202,20 @@ void tvp_init()
     tvp_set_hpllcoast(DEFAULT_PRE_COAST, DEFAULT_POST_COAST);
 
     //set analog (coarse) gain to max recommended value (-> 91% of the ADC range with 0.7Vpp input)
-    tvp_writereg(TVP_BG_CGAIN, 0x88);
-    tvp_writereg(TVP_R_CGAIN, 0x08);
-
     //set rest of the gain digitally (fine) to utilize 100% of the range at the output (0.91*(1+(26/256)) = 1)
-    tvp_set_fine_gain_offset(&def_gain_offs);
+    tvp_set_gain_offset(&def_gain_offs);
 }
 
-void tvp_set_fine_gain_offset(color_setup_t *col) {
+void tvp_set_gain_offset(color_setup_t *col) {
+    tvp_writereg(TVP_BG_CGAIN, ((col->c_gain << 4) | (col->c_gain & 0xF)));
+    tvp_writereg(TVP_R_CGAIN, col->c_gain);
     tvp_writereg(TVP_R_FGAIN, col->r_f_gain);
     tvp_writereg(TVP_G_FGAIN, col->g_f_gain);
     tvp_writereg(TVP_B_FGAIN, col->b_f_gain);
     tvp_writereg(TVP_R_FOFFSET_MSB, col->r_f_off);
     tvp_writereg(TVP_G_FOFFSET_MSB, col->g_f_off);
     tvp_writereg(TVP_B_FOFFSET_MSB, col->b_f_off);
+
 }
 
 // Configure H-PLL (sampling rate, VCO gain and charge pump current)

software/sys_controller/tvp7002/tvp7002.h

@@ -33,6 +33,7 @@
 #define DEFAULT_SYNC_VTH        0x0B
 #define DEFAULT_FINE_GAIN       26
 #define DEFAULT_FINE_OFFSET     0x80
+#define DEFAULT_COARSE_GAIN     0x8
 
 #define TVP_INTCLK_HZ           6500000UL
 #define TVP_EXTCLK_HZ           27000000UL
@@ -68,6 +69,7 @@ typedef struct {
     alt_u8 r_f_gain;
     alt_u8 g_f_gain;
     alt_u8 b_f_gain;
+    alt_u8 c_gain;
 } __attribute__((packed)) color_setup_t;
 
 
@@ -89,7 +91,7 @@ inline void tvp_set_ssthold(alt_u8 vsdetect_thold);
 
 void tvp_init();
 
-void tvp_set_fine_gain_offset(color_setup_t *col);
+void tvp_set_gain_offset(color_setup_t *col);
 
 void tvp_setup_hpll(alt_u16 h_samplerate, alt_u16 refclks_per_line, alt_u8 plldivby2);