AD7771 STM32 sample project example

Hi Aalakh ,

Attaching the example code. I hope this helps.

ad777x_iio-application.zip

I am using no_os ad7779 driver with STM32H745 MCU

Facing following issues in stm32_spi.c source file.

'SPI_CR1_BR_Pos' undeclared (first use in this function); did you mean 'SPI_CFG1_MBR_Pos'?

'SPI_SR_RXNE' undeclared (first use in this function); did you mean 'SPI_SR_RXWNE'?

'SPI_SR_TXE' undeclared (first use in this function); did you mean 'SPI_SR_TXP'?  

'SPI_TypeDef' has no member named 'DR'; did you mean 'SR'?    

Macros are not defined in stm32h7xx_hal.h

DR is not a member in SPI_TypeDef

Can you please check and confirm whether these drivers supports stm32H7 platform

Hi Aalakh ,

I believe the drivers do not support the STM32H7 platform.

But as a temporary solution, the macro SPI_CR1_BR_Pos can be replaced with the  SPI_CFG1_MBR_Pos.

The stm32_spi_write_and_read() function can be replaced with the following:

int32_t stm32_spi_write_and_read(struct spi_desc *desc,
                 uint8_t *data,
                 uint16_t bytes_number)
{
    int32_t ret;
    struct stm32_spi_desc *sdesc;
    if (!desc || !desc->extra || !data)
        return -EINVAL;
    if (!bytes_number)
        return 0;
    sdesc = desc->extra;
    ret = gpio_set_value(sdesc->chip_select, GPIO_LOW);
    if (ret < 0)
        goto error;
    ret = HAL_SPI_TransmitReceive(&sdesc->hspi, data, data, bytes_number,
                      HAL_MAX_DELAY);
    if (ret != HAL_OK) {
        if (ret == HAL_TIMEOUT)
            ret = -ETIMEDOUT;
        else
            ret = -EIO;
    }
error:
    return gpio_set_value(sdesc->chip_select, GPIO_HIGH);
}

Hi can you provide conversion of raw ADC counts to input voltage formula for bipolar input configuration?

Hi Aalakh ,

The data output format for this part is Two's complement. The following thread might help more on this.

ez.analog.com/.../445512

Right now it is developed for polling method. 

Do you have driver with DMA method or any suggestion to make it work with DMA

Aalakh - we do not have this implementation using SPI DMA.

The TDM Mode in this code works with the support of DMA

hello sunil, is there any resources available to kick start interfacing esp32 with ad4111 ic ?

hello sunil, is there any resources available to kick start interfacing esp32 with ad4111 ic ?

hello sunil, is there any resources available to kick start interfacing esp32 with ad4111 ic ?