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samples: drivers: i2s: echo: Add MAX9867 codec support
Add MAX9867 codec initialization support to the sample to later use for MAX32655FTHR support Signed-off-by: Anuj Pathak <[email protected]>
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‎samples/drivers/i2s/echo/Kconfig‎

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# Copyright (c) 2021 Nordic Semiconductor ASA
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# Copyright (c) 2025 Croxel Inc.
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# SPDX-License-Identifier: Apache-2.0
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source "Kconfig.zephyr"
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config I2C
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default $(dt_compat_on_bus,$(DT_COMPAT_WOLFSON_WM8731),i2c)
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default $(dt_compat_on_bus,$(DT_COMPAT_WOLFSON_WM8731),i2c) \
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|| $(dt_compat_on_bus,$(DT_COMPAT_ADI_MAX9867),i2c)
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config TOGGLE_ECHO_EFFECT_SW0
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bool "Toggle echo effect when pressing sw0"

‎samples/drivers/i2s/echo/dts/bindings/adi,max9867.yaml‎

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# Copyright (c) 2021 Nordic Semiconductor ASA
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# Copyright (c) 2025 Croxel Inc.
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# SPDX-License-Identifier: Apache-2.0
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# This binding has been added solely for the purpose of the overlay files used
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# in the drivers/i2s/output sample. That's why it is located in this sample source
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# directory. It can be moved and made available more widely if the need arises.
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description: MAX9867 Audio CODEC
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compatible: "adi,max9867"
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include: i2c-device.yaml

‎samples/drivers/i2s/echo/src/codec.c‎

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/*
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* Copyright (c) 2021 Nordic Semiconductor ASA
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* Copyright (c) 2025 Croxel Inc
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
@@ -123,3 +124,190 @@ bool init_wm8731_i2c(void)
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}
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#endif /* DT_ON_BUS(WM8731_NODE, i2c) */
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#if DT_ON_BUS(MAX9867_NODE, i2c)
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#define MAX9867_I2C_NODE DT_BUS(MAX9867_NODE)
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#define MAX9867_I2C_ADDR DT_REG_ADDR(MAX9867_NODE)
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/* Register addresses */
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#define MAX9867_00_STATUS 0x00
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#define MAX9867_01_JACKSENSE 0x01
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#define MAX9867_02_AUX_HIGH 0x02
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#define MAX9867_03_AUX_LOW 0x03
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#define MAX9867_04_INT_EN 0x04
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#define MAX9867_05_SYS_CLK 0x05
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#define MAX9867_06_CLK_HIGH 0x06
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#define MAX9867_07_CLK_LOW 0x07
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#define MAX9867_08_DAI_FORMAT 0x08
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#define MAX9867_09_DAI_CLOCK 0x09
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#define MAX9867_0A_DIG_FILTER 0x0A
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#define MAX9867_0B_SIDETONE 0x0B
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#define MAX9867_0C_LVL_DAC 0x0C
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#define MAX9867_0D_LVL_ADC 0x0D
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#define MAX9867_0E_LVL_LINE_IN_LEFT 0x0E
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#define MAX9867_0F_LVL_LINE_IN_RIGHT 0x0F
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#define MAX9867_10_VOL_LEFT 0x10
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#define MAX9867_11_VOL_RIGHT 0x11
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#define MAX9867_12_MIC_GAIN_LEFT 0x12
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#define MAX9867_13_MIC_GAIN_RIGHT 0x13
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#define MAX9867_14_ADC_INPUT 0x14
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#define MAX9867_15_MIC 0x15
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#define MAX9867_16_MODE 0x16
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#define MAX9867_17_PWR_SYS 0x17
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#define MAX9867_FF_REV_ID 0xFF
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/* MAX9867_04_INT_EN */
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#define MAX9867_ICLD (1 << 7)
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#define MAX9867_SDODLY (1 << 2)
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/* MAX9867_05_SYS_CLK */
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#define MAX9867_PSCLK_POS 4
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/* MAX9867_06_CLK_HIGH */
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#define MAX9867_PLL (1 << 7)
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#define MAX9867_NI_UPPER_8KHZ 0x10
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#define MAX9867_NI_UPPER_16KHZ 0x20
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#define MAX9867_NI_UPPER_24KHZ 0x30
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#define MAX9867_NI_UPPER_32KHZ 0x40
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#define MAX9867_NI_UPPER_44p1KHZ 0x58
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#define MAX9867_NI_UPPER_48KHZ 0x60
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/* MAX9867_07_CLK_LOW */
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#define MAX9867_NI_LOWER_OTHER 0x00
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#define MAX9867_NI_LOWER_44p1KHZ 0x33
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/* MAX9867_08_DAI_FORMAT */
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#define MAX9867_MAS (1 << 7)
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#define MAX9867_WCI (1 << 6)
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#define MAX9867_BCI (1 << 5)
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#define MAX9867_DLY (1 << 4)
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#define MAX9867_HIZOFF (1 << 3)
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#define MAX9867_TDM (1 << 2)
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/* MAX9867_09_DAI_CLOCK */
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#define MAX9867_BSEL_PCLK_DIV8 0x06
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/* MAX9867_0D_LVL_ADC */
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#define MAX9867_AVL_POS 4
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#define MAX9867_AVR_POS 0
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/*
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* MAX9867_0E_LVL_LINE_IN_LEFT
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* MAX9867_0F_LVL_LINE_IN_RIGHT
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*/
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#define MAX9867_LI_MUTE (1 << 6)
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#define MAX9867_LI_GAIN_POS 0
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/*
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* MAX9867_10_VOL_LEFT
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* MAX9867_11_VOL_RIGHT
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*/
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#define MAX9867_VOL_POS 0
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/* MAX9867_14_ADC_INPUT */
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#define MAX9867_MXINL_POS 6
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#define MAX9867_MXINR_POS 4
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#define MAX9867_MXIN_DIS 0
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#define MAX9867_MXIN_ANALOG_MIC 1
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#define MAX9867_MXIN_LINE 2
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/* MAX9867_15_MIC */
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#define MAX9867_MICCLK_POS 6
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#define MAX9867_DIGMICL_POS 5
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#define MAX9867_DIGMICR_POS 4
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/* MAX9867_16_MODE */
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#define MAX9867_HPMODE_POS 0
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#define MAX9867_STEREO_SE_CLICKLESS 4
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#define MAX9867_MONO_SE_CLICKLESS 5
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/* MAX9867_17_PWR_SYS */
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#define MAX9867_SHDN (1 << 7)
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#define MAX9867_LNLEN (1 << 6)
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#define MAX9867_LNREN (1 << 5)
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#define MAX9867_DALEN (1 << 3)
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#define MAX9867_DAREN (1 << 2)
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#define MAX9867_ADLEN (1 << 1)
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#define MAX9867_ADREN (1 << 0)
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bool init_max9867_i2c(void)
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{
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const struct device *const i2c_dev = DEVICE_DT_GET(MAX9867_I2C_NODE);
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/* Initialization data for MAX9867 registers. */
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static const uint8_t init[][2] = {
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/* Shutdown MAX9867 during configuration */
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{MAX9867_17_PWR_SYS, 0x00},
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/*
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* Clear all regs to POR state. The MAX9867 does not not have an external
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* reset signal. So manually writing 0, from (0x04 - 0x17)
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*/
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{MAX9867_04_INT_EN, 0x00},
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{MAX9867_05_SYS_CLK, 0x00},
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{MAX9867_06_CLK_HIGH, 0x00},
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{MAX9867_07_CLK_LOW, 0x00},
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{MAX9867_08_DAI_FORMAT, 0x00},
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{MAX9867_09_DAI_CLOCK, 0x00},
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{MAX9867_0A_DIG_FILTER, 0x00},
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{MAX9867_0B_SIDETONE, 0x00},
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{MAX9867_0C_LVL_DAC, 0x00},
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{MAX9867_0D_LVL_ADC, 0x00},
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{MAX9867_0E_LVL_LINE_IN_LEFT, 0x00},
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{MAX9867_0F_LVL_LINE_IN_RIGHT, 0x00},
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{MAX9867_10_VOL_LEFT, 0x00},
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{MAX9867_11_VOL_RIGHT, 0x00},
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{MAX9867_12_MIC_GAIN_LEFT, 0x00},
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{MAX9867_13_MIC_GAIN_RIGHT, 0x00},
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{MAX9867_14_ADC_INPUT, 0x00},
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{MAX9867_15_MIC, 0x00},
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{MAX9867_16_MODE, 0x00},
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{MAX9867_17_PWR_SYS, 0x00},
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/*
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* Select MCLK prescaler. PSCLK divides MCLK to generate a PCLK between 10MHz and
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* 20MHz. Set prescaler, FREQ field is 0 for Normal or PLL mode, < 20MHz.
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*/
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{MAX9867_05_SYS_CLK, 0x01 << MAX9867_PSCLK_POS},
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/* Configure codec to generate 48kHz sampling frequency in master mode */
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{MAX9867_06_CLK_HIGH, MAX9867_NI_UPPER_44p1KHZ},
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{MAX9867_07_CLK_LOW, MAX9867_NI_LOWER_44p1KHZ},
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{MAX9867_09_DAI_CLOCK, MAX9867_BSEL_PCLK_DIV8},
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/* I2S format */
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{MAX9867_08_DAI_FORMAT, MAX9867_MAS | MAX9867_DLY | MAX9867_HIZOFF},
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/* */
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{MAX9867_0A_DIG_FILTER, 0xA2},
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/* Select Digital microphone input */
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{MAX9867_15_MIC, ((0x1 << MAX9867_DIGMICR_POS))},
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/* ADC level */
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{MAX9867_0D_LVL_ADC, (3 << MAX9867_AVL_POS) | (3 << MAX9867_AVR_POS)},
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/*Set line-in level, disconnect line input from playback amplifiers */
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{MAX9867_0E_LVL_LINE_IN_LEFT, (0x0C << MAX9867_LI_GAIN_POS) | MAX9867_LI_MUTE},
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{MAX9867_0F_LVL_LINE_IN_RIGHT, (0x0C << MAX9867_LI_GAIN_POS) | MAX9867_LI_MUTE},
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/* Headphone mode */
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{MAX9867_16_MODE, MAX9867_STEREO_SE_CLICKLESS << MAX9867_HPMODE_POS},
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/* Set playback volume */
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{MAX9867_10_VOL_LEFT, 0x04 << MAX9867_VOL_POS},
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{MAX9867_11_VOL_RIGHT, 0x04 << MAX9867_VOL_POS},
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/* Enable */
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{MAX9867_17_PWR_SYS, MAX9867_SHDN | MAX9867_DALEN | MAX9867_DAREN | MAX9867_ADLEN},
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};
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if (!device_is_ready(i2c_dev)) {
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printk("%s is not ready\n", i2c_dev->name);
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return false;
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}
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for (int i = 0; i < ARRAY_SIZE(init); ++i) {
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const uint8_t *entry = init[i];
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int ret;
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ret = i2c_reg_write_byte(i2c_dev, MAX9867_I2C_ADDR, entry[0], entry[1]);
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if (ret < 0) {
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printk("Initialization step %d failed with %d\n", i, ret);
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return false;
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}
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}
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return true;
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}
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#endif /* DT_ON_BUS(MAX9867_NODE, i2c) */

‎samples/drivers/i2s/echo/src/codec.h‎

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/*
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* Copyright (c) 2021 Nordic Semiconductor ASA
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* Copyright (c) 2025 Croxel Inc
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define WM8731_NODE DT_NODELABEL(wm8731)
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#define MAX9867_NODE DT_NODELABEL(max9867)
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#if DT_ON_BUS(WM8731_NODE, i2c)
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bool init_wm8731_i2c(void);
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#endif
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#if DT_ON_BUS(MAX9867_NODE, i2c)
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bool init_max9867_i2c(void);
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#endif

‎samples/drivers/i2s/echo/src/main.c‎

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k_msleep(1000);
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#endif
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#if DT_ON_BUS(MAX9867_NODE, i2c)
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if (!init_max9867_i2c()) {
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return 0;
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}
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#endif
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if (!init_buttons()) {
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return 0;
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}

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