How to enable second page of DM?

Hi,

I'm experiencing an issue with writing to and reading from the upper page of DM0 memory on my ADAU1467 devices.

Current Setup:

I have two ADAU1467 DSP chips controlled by an STM32F446 uC via SPI. I've implemented a custom SIGMA_WRITE_REGISTER_BLOCK macro that works as follows: I pull the SS low to address one of the ICs, then send a message:
[ 0x00 for write or 0x01 for read | addr1 | addr0 | data ]
This implementation worked perfectly for both IC's.

The Problem:

As my project has grown, the SigmaStudio compiler has started using the upper page of DM0 on the second IC to store algorithms. The default_download_IC_2 function has following algorithm for writing to second page:

SIGMA_WRITE_REGISTER_BLOCK(DEVICE_ADDR_IC_2, REG_SECOND_PAGE_ENABLE_IC_2_ADDR,
REG_SECOND_PAGE_ENABLE_IC_2_BYTE, R61_SECOND_PAGE_ENABLE_IC_2_Default);
SIGMA_WRITE_REGISTER_BLOCK(DEVICE_ADDR_IC_2, DM0_UPPER_ADDR_IC_2,
DM0_UPPER_SIZE_IC_2, DM0_UPPER_Data_IC_2);
SIGMA_WRITE_REGISTER_BLOCK(DEVICE_ADDR_IC_2, REG_SECOND_PAGE_ENABLE_IC_2_ADDR,
REG_SECOND_PAGE_ENABLE_IC_2_BYTE, R63_SECOND_PAGE_ENABLE_IC_2_Default);

So we can see that to write or read from second page you need to set 0xF899 control register to 0x01, then send data, then disable second page with 0xF899 going 0x00.

My Implementation:

I attempted to apply the same approach (+ - new lines):

project_V1_IC_2_PARAM.h

#define MOD_OUTPUT16_INV_EQS300INVERT16INVERT_ADDR 1772

project_V1_IC_2.h

#define DM0_UPPER_ADDR_IC_2 1764

project_my_code.c

+ const uint8_t data_second_page_enable[2] = {0x00, 0x01};
+ const uint8_t data_second_page_disable[2] = {0x00, 0x00};

+ SIGMA_WRITE_REGISTER_BLOCK(DEVICE_ADDR_IC_2, REG_SECOND_PAGE_ENABLE_IC_2_ADDR,
REG_SECOND_PAGE_ENABLE_IC_2_BYTE, data_second_page_enable);

read_or_write_algo(MOD_OUTPUT16_INV_EQS300INVERT16INVERT_ADDR);

+ SIGMA_WRITE_REGISTER_BLOCK(DEVICE_ADDR_IC_2, REG_SECOND_PAGE_ENABLE_IC_2_ADDR,
REG_SECOND_PAGE_ENABLE_IC_2_BYTE, data_second_page_disable);

The Issue:

When I add this code, the second IC stops working entirely. Removing these lines restores normal operation, but the algorithms on the upper page remain inaccessible.

Could you help me identify what I'm doing wrong? Is there something I've overlooked in the second-page access procedure, or should I search for a problem in my custom SIGMA_WRITE_REGISTER_BLOCK implementation?

Edit Notes
Fixed spacing

[edited by: Richardmy at 11:12 AM (GMT -5) on 27 Jan 2026]

Audio Signal Processors

SECOND_PAGE_ENABLE

software

adau1467

sigma studio 4.7

SigmaDSP Audio Processors

0xF899

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