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board: mimxrt685_evk/mimxrt685s/hifi4: Add init code
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Add initialisation code for the HiFi 4 DSP domain of the mimxrt685_evk
board. Responsible for setting up signal sharing between Flexcomm zephyrproject-rtos#1 and
Flexcomm zephyrproject-rtos#3 peripherals both in the I2S mode (simultaneous audio
playback and capture).

Signed-off-by: Vit Stanicek <vit.stanicek@nxp.com>
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VitekST committed Jul 4, 2024
1 parent d8806b9 commit 6dcff4b
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1 change: 1 addition & 0 deletions boards/nxp/mimxrt685_evk/CMakeLists.txt
Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@ endif()

if(CONFIG_BOARD_MIMXRT685_EVK_MIMXRT685S_HIFI4)
zephyr_library()
zephyr_library_sources(hifi4/init.c)
endif()

if(CONFIG_NXP_IMXRT_BOOT_HEADER)
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49 changes: 49 additions & 0 deletions boards/nxp/mimxrt685_evk/hifi4/init.c
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/*
* Copyright 2020-2024 NXP
*
* SPDX-License-Identifier: Apache-2.0
*/

#include <zephyr/init.h>
#include <zephyr/devicetree.h>
#include <fsl_device_registers.h>

static int mimxrt685_evk_hifi4_init(void)
{
/* flexcomm1 and flexcomm3 are configured to loopback the TX signal to RX */
#if (DT_NODE_HAS_COMPAT_STATUS(DT_NODELABEL(flexcomm1), nxp_lpc_i2s, okay)) && \
(DT_NODE_HAS_COMPAT_STATUS(DT_NODELABEL(flexcomm3), nxp_lpc_i2s, okay)) && \
CONFIG_I2S

/* Set shared signal set 0 SCK, WS from Transmit I2S - Flexcomm3 */
SYSCTL1->SHAREDCTRLSET[0] = SYSCTL1_SHAREDCTRLSET_SHAREDSCKSEL(3) |
SYSCTL1_SHAREDCTRLSET_SHAREDWSSEL(3);

#ifdef CONFIG_I2S_TEST_SEPARATE_DEVICES
/* Select Data in from Transmit I2S - Flexcomm 3 */
SYSCTL1->SHAREDCTRLSET[0] |= SYSCTL1_SHAREDCTRLSET_SHAREDDATASEL(3);
/* Enable Transmit I2S - Flexcomm 3 for Shared Data Out */
SYSCTL1->SHAREDCTRLSET[0] |= SYSCTL1_SHAREDCTRLSET_FC3DATAOUTEN(1);
#endif

/* Set Receive I2S - Flexcomm 1 SCK, WS from shared signal set 0 */
SYSCTL1->FCCTRLSEL[1] = SYSCTL1_FCCTRLSEL_SCKINSEL(1) |
SYSCTL1_FCCTRLSEL_WSINSEL(1);

/* Set Transmit I2S - Flexcomm 3 SCK, WS from shared signal set 0 */
SYSCTL1->FCCTRLSEL[3] = SYSCTL1_FCCTRLSEL_SCKINSEL(1) |
SYSCTL1_FCCTRLSEL_WSINSEL(1);

#ifdef CONFIG_I2S_TEST_SEPARATE_DEVICES
/* Select Receive I2S - Flexcomm 1 Data in from shared signal set 0 */
SYSCTL1->FCCTRLSEL[1] |= SYSCTL1_FCCTRLSEL_DATAINSEL(1);
/* Select Transmit I2S - Flexcomm 3 Data out to shared signal set 0 */
SYSCTL1->FCCTRLSEL[3] |= SYSCTL1_FCCTRLSEL_DATAOUTSEL(1);
#endif

#endif

return 0;
}

SYS_INIT(mimxrt685_evk_hifi4_init, PRE_KERNEL_1, 0);

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