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OneOfEleven
2023-09-18 17:42:54 +01:00
parent 39c0f0afac
commit 06722a23d5
3 changed files with 158 additions and 19 deletions
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87
app/app.c
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@ -464,7 +464,7 @@ void APP_StartListening(FUNCTION_Type_t Function)
// RX AF level
//
// REG_48 <15:12> 11 ??????
// REG_48 <15:12> 11 ???
//
// REG_48 <11:10> 0 AF Rx Gain-1
// 0 = 0dB
@ -476,10 +476,9 @@ void APP_StartListening(FUNCTION_Type_t Function)
// 63 = max
// 0 = mute
//
// REG_48 <3:0> 15 AF DAC Gain (after Gain-1 and Gain-2)
// REG_48 <3:0> 15 AF DAC Gain (after Gain-1 and Gain-2) approx 2dB/step
// 15 = max
// 0 = min
// approx 2dB/step
//
BK4819_WriteRegister(BK4819_REG_48,
#if 0
@ -496,9 +495,44 @@ void APP_StartListening(FUNCTION_Type_t Function)
BK4819_WriteRegister(0x4B, BK4819_ReadRegister(0x4B) & ~(1u << 5)); // enable RX ALC
// help improve AM RX distorted audio by reducing the PGA gain (still bad with stronger signals
// help improve AM RX distorted audio by reducing the PGA gain (still very bad with stronge signals)
//
// I think the proper solution is to set the RX AGC to limit the front end/I.F gain
// I think a solution is to dynamically change these values as the RSSI moves up/down ?
// without a detailed datasheet on the chip it's very difficult to fix things
//
// REG_10 <15:0> 0x0038 Rx AGC Gain Table[0]. (Index Max->Min is 3,2,1,0,-1)
//
// <9:8> = LNA Gain Short
// 3 = 0dB
// 2 = -11dB
// 1 = -16dB
// 0 = -19dB
//
// <7:5> = LNA Gain
// 7 = 0dB
// 6 = -2dB
// 5 = -4dB
// 4 = -6dB
// 3 = -9dB
// 2 = -14dB
// 1 = -19dB
// 0 = -24dB
//
// <4:3> = MIXER Gain
// 3 = 0dB
// 2 = -3dB
// 1 = -6dB
// 0 = -8dB
//
// <2:0> = PGA Gain
// 7 = 0dB
// 6 = -3dB
// 5 = -6dB
// 4 = -9dB
// 3 = -15dB
// 2 = -21dB
// 1 = -27dB
// 0 = -33dB
//
// LNA_SHORT .. 0dB
// LNA ........ 14dB
@ -506,6 +540,10 @@ void APP_StartListening(FUNCTION_Type_t Function)
// PGA ........ -15dB
// LNA SHORT LNA MIXER PGA
BK4819_WriteRegister(BK4819_REG_13, (3u << 8) | (2u << 5) | (3u << 3) | (3u << 0));
//BK4819_WriteRegister(BK4819_REG_12, 0x037B); // 000000 11 011 11 011
//BK4819_WriteRegister(BK4819_REG_11, 0x027B); // 000000 10 011 11 011
//BK4819_WriteRegister(BK4819_REG_10, 0x007A); // 000000 00 011 11 010
//BK4819_WriteRegister(BK4819_REG_14, 0x0019); // 000000 00 000 11 001
gNeverUsed = 0;
}
@ -514,7 +552,7 @@ void APP_StartListening(FUNCTION_Type_t Function)
// RX AF level
//
// REG_48 <15:12> 11 ??????
// REG_48 <15:12> 11 ???
//
// REG_48 <11:10> 0 AF Rx Gain-1
// 0 = 0dB
@ -526,10 +564,9 @@ void APP_StartListening(FUNCTION_Type_t Function)
// 63 = max
// 0 = mute
//
// REG_48 <3:0> 15 AF DAC Gain (after Gain-1 and Gain-2)
// REG_48 <3:0> 15 AF DAC Gain (after Gain-1 and Gain-2) approx 2dB/step
// 15 = max
// 0 = min
// approx 2dB/step
//
BK4819_WriteRegister(BK4819_REG_48,
(11u << 12) | // ???
@ -539,6 +576,40 @@ void APP_StartListening(FUNCTION_Type_t Function)
BK4819_WriteRegister(0x4B, BK4819_ReadRegister(0x4B) | (1u << 5)); // disable RX ALC
// REG_10 <15:0> 0x0038 Rx AGC Gain Table[0]. (Index Max->Min is 3,2,1,0,-1)
//
// <9:8> = LNA Gain Short
// 3 = 0dB
// 2 = -11dB
// 1 = -16dB
// 0 = -19dB
//
// <7:5> = LNA Gain
// 7 = 0dB
// 6 = -2dB
// 5 = -4dB
// 4 = -6dB
// 3 = -9dB
// 2 = -14dB
// 1 = -19dB
// 0 = -24dB
//
// <4:3> = MIXER Gain
// 3 = 0dB
// 2 = -3dB
// 1 = -6dB
// 0 = -8dB
//
// <2:0> = PGA Gain
// 7 = 0dB
// 6 = -3dB
// 5 = -6dB
// 4 = -9dB
// 3 = -15dB
// 2 = -21dB
// 1 = -27dB
// 0 = -33dB
//
// LNA_SHORT .. 0dB
// LNA ........ 14dB
// MIXER ...... 0dB