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fix: restore 'lost' radio sensitivity

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This commit is contained in:
bricky149 2023-10-24 20:35:53 +01:00
parent a94f99130f
commit 315bf4c9be
3 changed files with 88 additions and 108 deletions
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2
Makefile
View File

@ -254,7 +254,7 @@ CFLAGS =
ifeq ($(ENABLE_CLANG),0)
#CFLAGS += -Os -Wall -Werror -mcpu=cortex-m0 -fno-builtin -fshort-enums -fno-delete-null-pointer-checks -std=c11 -MMD
CFLAGS += -Os -Werror -mcpu=cortex-m0 -std=c11 -MMD
CFLAGS += -Os -Werror -mcpu=cortex-m0 -fmodulo-sched -freorder-blocks-algorithm=stc -std=c11 -MMD
else
# Oz needed to make it fit on flash
CFLAGS += -Oz -Werror -mcpu=cortex-m0 -fno-builtin -fshort-enums -fno-delete-null-pointer-checks -std=c11 -MMD

191
driver/bk4819.c
View File

@ -53,8 +53,8 @@ void BK4819_Init(void)
BK4819_WriteRegister(BK4819_REG_37, 0x1D0F);
BK4819_WriteRegister(BK4819_REG_36, 0x0022);
// BK4819_SetAGC(0);
BK4819_SetAGC(1); // ???
// BK4819_DisableAGC();
BK4819_EnableAGC();
BK4819_WriteRegister(BK4819_REG_19, 0x1041); // 0001 0000 0100 0001 <15> MIC AGC 1 = disable 0 = enable
@ -261,119 +261,98 @@ void BK4819_WriteU16(uint16_t Data)
}
}
void BK4819_SetAGC(uint8_t Value)
void BK4819_DisableAGC()
{
if (Value == 0)
{
// REG_10
//
// 0x0038 Rx AGC Gain Table[0]. (Index Max->Min is 3,2,1,0,-1)
//
// <15:10> ???
//
// <9:8> LNA Gain Short
// 3 = 0dB <<<
// 2 = -24dB // was -11
// 1 = -30dB // was -16
// 0 = -33dB // was -19
//
// <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
//
BK4819_WriteRegister(BK4819_REG_13, (3u << 8) | (2u << 5) | (3u << 3) | (6u << 0)); // 000000 11 101 11 110
// REG_10
//
// 0x0038 Rx AGC Gain Table[0]. (Index Max->Min is 3,2,1,0,-1)
//
// <15:10> ???
//
// <9:8> LNA Gain Short
// 3 = 0dB <<<
// 2 = -24dB // was -11
// 1 = -30dB // was -16
// 0 = -33dB // was -19
//
// <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
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
// undoes BK4819_EnableAGC reg write
//BK4819_WriteRegister(BK4819_REG_7E, (0u << 15));
BK4819_WriteRegister(BK4819_REG_49, 0x2A38);
BK4819_WriteRegister(BK4819_REG_7B, 0x8420);
}
else
if (Value == 1)
{ // what does this do ???
BK4819_WriteRegister(BK4819_REG_13, (3u << 8) | (2u << 5) | (3u << 3) | (6u << 0)); // 000000 11 101 11 110
unsigned int i;
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
// REG_10
//
// 0x0038 Rx AGC Gain Table[0]. (Index Max->Min is 3,2,1,0,-1)
//
// (15:10> ???
//
// <9:8> LNA Gain Short
// 3 = 0dB << original
// 2 = -24dB // was -11
// 1 = -30dB // was -16
// 0 = -33dB // was -19
//
// <7:5> LNA Gain
// 7 = 0dB
// 6 = -2dB
// 5 = -4dB
// 4 = -6dB
// 3 = -9dB
// 2 = -14dB << original
// 1 = -19dB
// 0 = -24dB
//
// <4:3> MIXER Gain
// 3 = 0dB << original
// 2 = -3dB
// 1 = -6dB
// 0 = -8dB
//
// <2:0> PGA Gain
// 7 = 0dB
// 6 = -3dB << original
// 5 = -6dB
// 4 = -9dB
// 3 = -15dB
// 2 = -21dB
// 1 = -27dB
// 0 = -33dB
//
BK4819_WriteRegister(BK4819_REG_13, (3u << 8) | (2u << 5) | (3u << 3) | (6u << 0));
// undocumented ?
BK4819_WriteRegister(BK4819_REG_49, 0x2A38);
BK4819_WriteRegister(BK4819_REG_7B, 0x8420);
}
BK4819_WriteRegister(BK4819_REG_12, 0x037C); // 000000 11 011 11 100
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, 0x0018); // 000000 00 000 11 000
void BK4819_EnableAGC()
{
// TODO: See if this attenuates overloading
// signals as well as boosting weak ones
//
// REG_7E
//
// <15> 0 AGC Fix Mode.
// 1=Fix; 0=Auto.
//
// <14:12> 0b011 AGC Fix Index.
// 011=Max, then 010,001,000,111,110,101,100(min).
//
// <5:3> 0b101 DC Filter Band Width for Tx (MIC In).
// 000=Bypass DC filter;
//
// <2:0> 0b110 DC Filter Band Width for Rx (IF In).
// 000=Bypass DC filter;
BK4819_WriteRegister(BK4819_REG_49, 0x2A38);
BK4819_WriteRegister(BK4819_REG_7B, 0x318C);
// default fix index too strong, set to min (011->100)
//BK4819_WriteRegister(BK4819_REG_7E, (1u << 15) | (4u << 12) | (5u << 3) | (6u << 0));
BK4819_WriteRegister(BK4819_REG_7C, 0x595E);
BK4819_WriteRegister(BK4819_REG_20, 0x8DEF);
BK4819_WriteRegister(BK4819_REG_12, 0x037C);
BK4819_WriteRegister(BK4819_REG_11, 0x027B);
BK4819_WriteRegister(BK4819_REG_10, 0x007A);
BK4819_WriteRegister(BK4819_REG_14, 0x0018);
for (i = 0; i < 8; i++)
// Bug? The bit 0x2000 below overwrites the (i << 13)
BK4819_WriteRegister(BK4819_REG_06, ((i << 13) | 0x2500u) + 0x036u);
}
// undocumented ?
BK4819_WriteRegister(BK4819_REG_49, 0x2A38);
BK4819_WriteRegister(BK4819_REG_7B, 0x318C);
BK4819_WriteRegister(BK4819_REG_7C, 0x595E);
BK4819_WriteRegister(BK4819_REG_20, 0x8DEF);
// fagci had the answer to why we weren't as sensitive!
for (unsigned int i = 0; i < 8; i++) {
BK4819_WriteRegister(0x06, (i & 7) << 13 | 0x4A << 7 | 0x36);
}
}
void BK4819_set_GPIO_pin(bk4819_gpio_pin_t Pin, bool bSet)

3
driver/bk4819.h
View File

@ -67,7 +67,8 @@ void BK4819_WriteRegister(bk4819_register_t Register, uint16_t Data);
void BK4819_WriteU8(uint8_t Data);
void BK4819_WriteU16(uint16_t Data);
void BK4819_SetAGC(uint8_t Value);
void BK4819_DisableAGC();
void BK4819_EnableAGC();
void BK4819_set_GPIO_pin(bk4819_gpio_pin_t Pin, bool bSet);