Julian Daube
41ee7ab012
firmware accepts commands over usb and switches inputs based on button presses
75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
/*
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* bd3491.c
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*
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* Created on: 20.10.2019
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* Author: julian
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*/
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#include "bd3491.h"
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// BD3491 driver
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void bd_write_reg(I2C_HandleTypeDef * handle, uint8_t reg, uint8_t data) {
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uint8_t out[] = {
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reg,
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data
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};
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HAL_I2C_Master_Transmit(handle, 0b10000010, out, sizeof(out), HAL_MAX_DELAY);
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}
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void bd_set_input(I2C_HandleTypeDef * handle, uint8_t number) {
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if (number > 5) {
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return;
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}
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bd_write_reg(handle, 0x04, number);
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}
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#define BD_GAIN_TABLE(a) \
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a( 0, 0) \
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a( 2, 1) \
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a( 4, 2) \
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a( 6, 3) \
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a( 8, 4) \
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a(12, 6) \
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a(16, 8) \
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a(20, 10)
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int bd_set_gain(I2C_HandleTypeDef * handle, uint8_t gain_in_db) {
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uint8_t regvalue = 0;
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if (gain_in_db > BD_MAX_GAIN) gain_in_db = BD_MAX_GAIN;
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#define FINDREG(db, reg) if (gain_in_db <= db) { gain_in_db = db; regvalue = reg; } else
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BD_GAIN_TABLE(FINDREG) {
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// gain not in table (should not happen)
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}
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#undef FINDREG
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bd_write_reg(handle, 0x06, regvalue<<1);
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return gain_in_db;
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}
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uint8_t bd_set_attenuation(I2C_HandleTypeDef * handle, uint8_t right_channel, uint8_t attenuation_in_db) {
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if ((attenuation_in_db&0x7F) > 87)
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attenuation_in_db = BD_INF_ATTENUATION;
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bd_write_reg(handle, 0x21 + right_channel, attenuation_in_db | 0x80);
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return attenuation_in_db;
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}
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// when gain == 0, cut bass boost
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void bd_set_bass_boost(I2C_HandleTypeDef * handle, uint8_t gain) {
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bd_write_reg(handle, 0x51, (gain == 0)?(0x80):(0x00) | (gain&0x07) << 1);
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}
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// when gain == 0, cut treble boost
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void bd_set_treble_boost(I2C_HandleTypeDef * handle, uint8_t gain) {
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bd_write_reg(handle, 0x57, (gain == 0)?(0x80):(0x00) | (gain&0x07) << 1);
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}
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void bd_set_sourround(I2C_HandleTypeDef * handle, enum BD_SOURROUND_GAIN gain) {
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uint8_t enable = (gain != BD_SOURROUND_OFF)?0x80:0;
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bd_write_reg(handle, 0x78, enable | gain);
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}
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