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More commenting around the BK chip registers

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OneOfEleven
2023-09-18 16:58:36 +01:00
parent f55c63e2af
commit 39c0f0afac
6 changed files with 118 additions and 39 deletions
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26
driver/bk4819.c
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@ -58,8 +58,30 @@ void BK4819_Init(void)
BK4819_WriteRegister(BK4819_REG_7D, 0xE940);
// RX AF level
BK4819_WriteRegister(BK4819_REG_48, 0xB3A8);
//
// REG_48 <15:12> 11 ??????
//
// REG_48 <11:10> 0 AF Rx Gain-1
// 0 = 0dB
// 1 = -6dB
// 2 = -12dB
// 3 = -18dB
//
// REG_48 <9:4> 60 AF Rx Gain-2 -26dB ~ 5.5dB 0.5dB/step
// 63 = max
// 0 = mute
//
// REG_48 <3:0> 15 AF DAC Gain (after Gain-1 and Gain-2)
// 15 = max
// 0 = min
// approx 2dB/step
//
BK4819_WriteRegister(BK4819_REG_48, // 0xB3A8); // 1011 00 111010 1000
(11u << 12) | // ???
( 0u << 10) | // AF Rx Gain-1
(58u << 4) | // AF Rx Gain-2
( 8u << 0)); // AF DAC Gain (after Gain-1 and Gain-2)
const uint8_t dtmf_coeffs[] = {0x6F,0x6B,0x67,0x62,0x50,0x47,0x3A,0x2C,0x41,0x37,0x25,0x17,0xE4,0xCB,0xB5,0x9F};
for (unsigned int i = 0; i < ARRAY_SIZE(dtmf_coeffs); i++)
BK4819_WriteRegister(BK4819_REG_09, (i << 12) | dtmf_coeffs[i]);