fix(amp): drop the prototype EQ and restore the flat coefficients
The captured sample curves made the tone uneven. Rewrite the datasheet bypass values at boot because a software reset leaves the old coefficients in RAM. Co-authored-by: Cursor <cursoragent@cursor.com>
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yuquanjun
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4983a424e5
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49e30681cb
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@ -295,87 +295,27 @@ AD85020B_StatusTypeDef AD85020B_RamRead24(uint8_t ram_addr, uint8_t bank, uint32
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return AD85020B_OK;
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}
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/* 样机《音频DSP配置汇总》：每段 5 个 Q3.21 系数，地址顺序 A1 A2 B1 B2 A0。
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分母为 1 - B1·z^-1 - B2·z^-2。直通段也写入，避免软复位后 RAM 仍残留旧值。 */
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typedef struct
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/* 样机 EQ 会留在功放 RAM 里，软复位清不掉。写回手册直通，恢复样机表之前的功放音色。
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直通：A1/A2/B1/B2 = 0，A0 = 0x200000。覆盖两路 EQ1–EQ18。 */
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static AD85020B_StatusTypeDef AD85020B_RestoreDefaultEq(void)
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{
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uint8_t bank;
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uint8_t base;
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uint32_t a1;
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uint32_t a2;
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uint32_t b1;
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uint32_t b2;
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uint32_t a0;
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} AD85020B_EqBand;
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static const AD85020B_EqBand s_proto_eq[] =
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{
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/* CH1 bank0：EQ1–EQ5 为样机非直通，EQ6–EQ18 直通 */
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{0, 0x00, 0xC25937, 0x1ED364, 0x3D9BF6, 0xE24E65, 0x1ED364},
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{0, 0x05, 0xC2FCBC, 0x1D24C7, 0x3D0344, 0xE2DB39, 0x200000},
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{0, 0x0A, 0xCFC351, 0x137DEF, 0x303CAF, 0xEBC9F2, 0x20B81F},
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{0, 0x0F, 0xC454DD, 0x1DD591, 0x3B8646, 0xE43000, 0x1DD591},
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{0, 0x14, 0xDF8842, 0x0B92EF, 0x2077BE, 0xF215B2, 0x22575F},
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{0, 0x19, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{0, 0x1E, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{0, 0x23, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{0, 0x28, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{0, 0x2D, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{0, 0x32, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{0, 0x37, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{0, 0x3C, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{0, 0x41, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{0, 0x46, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{0, 0xA0, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{0, 0xA5, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{0, 0xAA, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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/* CH2 bank1：EQ1–EQ7 为样机非直通，EQ8–EQ18 直通 */
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{1, 0x00, 0x00F723, 0x007B91, 0x36BC77, 0xE75542, 0x007B91},
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{1, 0x05, 0xC0243C, 0x1FD490, 0x3FDBC4, 0xE02403, 0x20076D},
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{1, 0x0A, 0xC016F7, 0x1FF484, 0x3FE905, 0xE016F3, 0x1FF484},
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{1, 0x0F, 0xC21CAD, 0x1DF911, 0x3DE353, 0xE206EF, 0x200000},
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{1, 0x14, 0xC04043, 0x1FC9CB, 0x3FBFBD, 0xE03F7A, 0x1FF6BB},
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{1, 0x19, 0xC0E5B4, 0x1F1D69, 0x3F1A4C, 0xE0E297, 0x200000},
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{1, 0x1E, 0x00EB92, 0x0075C9, 0x342C97, 0xE9FC45, 0x0075C9},
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{1, 0x23, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{1, 0x28, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{1, 0x2D, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{1, 0x32, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{1, 0x37, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{1, 0x3C, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{1, 0x41, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{1, 0x46, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{1, 0xA0, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{1, 0xA5, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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{1, 0xAA, 0x000000, 0x000000, 0x000000, 0x000000, 0x200000},
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};
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static AD85020B_StatusTypeDef AD85020B_ApplyPrototypeEq(void)
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{
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uint16_t i;
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uint8_t k;
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uint8_t addr;
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AD85020B_StatusTypeDef status;
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status = AD85020B_I2C_Write(AD85020B_REG_SCTL4, AD85020B_SCTL4_PROTO_EQ);
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for (bank = 0U; bank < 2U; bank++)
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{
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for (addr = 0x00U; addr <= 0x4AU; addr++)
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{
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status = AD85020B_RamWrite24(addr, bank,
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((addr % 5U) == 4U) ? 0x200000UL : 0UL);
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if (status != AD85020B_OK)
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return status;
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for (i = 0; i < (uint16_t)(sizeof(s_proto_eq) / sizeof(s_proto_eq[0])); i++)
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}
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for (addr = 0xA0U; addr <= 0xAEU; addr++)
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{
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const uint32_t coef[5] =
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{
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s_proto_eq[i].a1,
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s_proto_eq[i].a2,
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s_proto_eq[i].b1,
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s_proto_eq[i].b2,
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s_proto_eq[i].a0
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};
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for (k = 0; k < 5U; k++)
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{
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status = AD85020B_RamWrite24((uint8_t)(s_proto_eq[i].base + k),
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s_proto_eq[i].bank,
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coef[k]);
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status = AD85020B_RamWrite24(addr, bank,
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((addr % 5U) == 4U) ? 0x200000UL : 0UL);
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if (status != AD85020B_OK)
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return status;
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}
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@ -469,8 +409,8 @@ AD85020B_StatusTypeDef AD85020B_Init(void)
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/* 样机 EQ：在解除静音前写入。写失败也要继续解除静音，否则拨片和琴弦无声 */
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(void)AD85020B_ApplyPrototypeEq();
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/* 写回直通 EQ。失败也要解除静音，否则拨片和琴弦无声 */
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(void)AD85020B_RestoreDefaultEq();
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/* 步骤6：解除静音（文档SCTL3，MMUTE=0，0x00） */
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status = AD85020B_I2C_Write(AD85020B_REG_SCTL3, 0x00);
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@ -39,12 +39,9 @@
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#define AD85020B_REG_SCTL3 0x02 // 静音控制
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#define AD85020B_SCTL3_MMUTE 0x40 /* B6=1：主静音，退出时芯片做淡入 */
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#define AD85020B_REG_MVOL 0x03 // 主音量控制
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#define AD85020B_REG_SCTL4 0x0C /* EQ / DEQ / 音调；样机 0x90：EQ 开、左右独立 */
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#define AD85020B_SCTL4_PROTO_EQ 0x90
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#define AD85020B_REG_HEADPHONEVOL 0x87 // 耳机音量控制
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/* 系数 RAM 间接访问（手册 0x1D~0x2D）
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寄存器表 CFA 为 8 位；RAM 图地址到 0xB0。按样机抓包把完整地址写入 0x1D。 */
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/* 系数 RAM 间接访问（手册 0x1D~0x2D）。CFA 按 8 位写入，RAM 图地址到 0xB0。 */
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#define AD85020B_REG_CFA 0x1D /* CFA[7:0] RAM 基址 */
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#define AD85020B_REG_A1_T 0x1E /* 系数 top [23:16] */
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#define AD85020B_REG_A1_M 0x1F /* 系数 middle [15:8] */
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