Register usage conflict?

Projects Programming
1

Hello,
I am using a library that defines a lot of different variables manually (I think; correct me if I am wrong) -
for instance:

ad7124_st_reg ad7124_regs[57] = {
        {0x00, 0x00,   1, 2}, /* AD7124_Status */
        {0x01, 0x0000, 2, 1}, /* AD7124_ADC_Control */
        {0x02, 0x0000, 3, 2}, /* AD7124_Data */
        {0x03, 0x000000, 3, 1}, /* AD7124_IOCon1 */
        {0x04, 0x0000, 2, 1}, /* AD7124_IOCon2 */
        {0x05, 0x12,   1, 2}, /* AD7124_ID */
        {0x06, 0x0000, 3, 2}, /* AD7124_Error */
        {0x07, 0x000040, 3, 1}, /* AD7124_Error_En */
        {0x08, 0x00,   1, 2}, /* AD7124_Mclk_Count */
        {0x09, 0x8001, 2, 1}, /* AD7124_Channel_0 */
        {0x0A, 0x0001, 2, 1}, /* AD7124_Channel_1 */
        {0x0B, 0x0001, 2, 1}, /* AD7124_Channel_2 */
        {0x0C, 0x0001, 2, 1}, /* AD7124_Channel_3 */
        {0x0D, 0x0001, 2, 1}, /* AD7124_Channel_4 */
        {0x0E, 0x0001, 2, 1}, /* AD7124_Channel_5 */
        {0x0F, 0x0001, 2, 1}, /* AD7124_Channel_6 */
        {0x10, 0x0001, 2, 1}, /* AD7124_Channel_7 */
        {0x11, 0x0001, 2, 1}, /* AD7124_Channel_8 */
        {0x12, 0x0001, 2, 1}, /* AD7124_Channel_9 */
        {0x13, 0x0001, 2, 1}, /* AD7124_Channel_10 */
        {0x14, 0x0001, 2, 1}, /* AD7124_Channel_11 */
        {0x15, 0x0001, 2, 1}, /* AD7124_Channel_12 */
        {0x16, 0x0001, 2, 1}, /* AD7124_Channel_13 */
        {0x17, 0x0001, 2, 1}, /* AD7124_Channel_14 */
        {0x18, 0x0001, 2, 1}, /* AD7124_Channel_15 */
        {0x19, 0x0860, 2, 1}, /* AD7124_Config_0 */
        {0x1A, 0x0860, 2, 1}, /* AD7124_Config_1 */
        {0x1B, 0x0860, 2, 1}, /* AD7124_Config_2 */
        {0x1C, 0x0860, 2, 1}, /* AD7124_Config_3 */
        {0x1D, 0x0860, 2, 1}, /* AD7124_Config_4 */
        {0x1E, 0x0860, 2, 1}, /* AD7124_Config_5 */
        {0x1F, 0x0860, 2, 1}, /* AD7124_Config_6 */
        {0x20, 0x0860, 2, 1}, /* AD7124_Config_7 */
        {0x21, 0x060180, 3, 1}, /* AD7124_Filter_0 */
        {0x22, 0x060180, 3, 1}, /* AD7124_Filter_1 */
        {0x23, 0x060180, 3, 1}, /* AD7124_Filter_2 */
        {0x24, 0x060180, 3, 1}, /* AD7124_Filter_3 */
        {0x25, 0x060180, 3, 1}, /* AD7124_Filter_4 */
        {0x26, 0x060180, 3, 1}, /* AD7124_Filter_5 */
        {0x27, 0x060180, 3, 1}, /* AD7124_Filter_6 */
        {0x28, 0x060180, 3, 1}, /* AD7124_Filter_7 */
        {0x29, 0x800000, 3, 1}, /* AD7124_Offset_0 */
        {0x2A, 0x800000, 3, 1}, /* AD7124_Offset_1 */
        {0x2B, 0x800000, 3, 1}, /* AD7124_Offset_2 */
        {0x2C, 0x800000, 3, 1}, /* AD7124_Offset_3 */
        {0x2D, 0x800000, 3, 1}, /* AD7124_Offset_4 */
        {0x2E, 0x800000, 3, 1}, /* AD7124_Offset_5 */
        {0x2F, 0x800000, 3, 1}, /* AD7124_Offset_6 */
        {0x30, 0x800000, 3, 1}, /* AD7124_Offset_7 */
        {0x31, 0x500000, 3, 1}, /* AD7124_Gain_0 */
        {0x32, 0x500000, 3, 1}, /* AD7124_Gain_1 */
        {0x33, 0x500000, 3, 1}, /* AD7124_Gain_2 */
        {0x34, 0x500000, 3, 1}, /* AD7124_Gain_3 */
        {0x35, 0x500000, 3, 1}, /* AD7124_Gain_4 */
        {0x36, 0x500000, 3, 1}, /* AD7124_Gain_5 */
        {0x37, 0x500000, 3, 1}, /* AD7124_Gain_6 */
        {0x38, 0x500000, 3, 1}, /* AD7124_Gain_7 */
    };

Now my next question is:
If I make a sketch and include the library mentioned above,
When I then declare a variable (example uint32_t myVars[5]; ), does the Arduino automatically make sure that my variable occupies a "free" register(s) space so that no conflict occurs?
I am wondering about this because there is some problem with my code and I am troubleshooting...

Best regards - Einar.

2

yes the compiler knows where the variables are in memory and won't allocate them at the same place.

variables are in SRAM space, dedicated for variables, not in registers (except when optimisation occurs, but they are working registers and the compiler knows what's going on)

you big array is a list of 57 quadruplets, each representing something defined by the ad7124_st_reg type which is likely {register address, register value, register size, and Read/Write capabilities}. This array — as all variables — is in SRAM too

3

As you topic is far more related to programming than to Installation and Troubleshooting, it has been moved.

4

Cheers Jackson,
Thank you a lot for your reply and the answer provided!
Now I know the problem is not there at least :slight_smile:,
Kind regards - Einar

5

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