HAL SPI Transmit Receive function not working correctly? - spi

Question

I am trying to create a data aqcuisition system for a load cell, using the INA128P amplifier, the LTC1296 12-bit ADC and a NUCLEO f401re with code on STM32CubeIDE. I have been having problems trying to make the SPI to work properly, since according to my logic analyser the input word to configure the ADC is not transmitted correctly and all the bits received are high. Below are my code and information from the LTC1296 datasheet
LTC1296 SPI information
/* USER CODE BEGIN Header */
/**
******************************************************************************
* #file : main.c
* #brief : Main program body
******************************************************************************
* #attention
*
* Copyright (c) 2022 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include <stdio.h>
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
SPI_HandleTypeDef hspi1;
UART_HandleTypeDef huart2;
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART2_UART_Init(void);
static void MX_SPI1_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/**
* #brief The application entry point.
* #retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
char uart_buf[100];
char boofer[100];
uint8_t ADC_buf[3];
//input word is 00010100 11000000
uint8_t input_word[3] = {0x14, 0xC0, 0x00};
int uart_buf_len;
int length;
uint16_t testdata[100];
uint8_t i = 0;
uint16_t sample;
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_USART2_UART_Init();
MX_SPI1_Init();
/* USER CODE BEGIN 2 */
// CS pin should default high
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_SET);
uart_buf_len = sprintf(uart_buf, "SPI test\r\n");
HAL_UART_Transmit(&huart2, (uint8_t *)uart_buf, uart_buf_len, 100);
HAL_Delay(1000);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_RESET);
HAL_SPI_TransmitReceive(&hspi1, input_word, ADC_buf, 3, 10);
//while(&hspi1.State == HAL_SPI_STATE_BUSY);
//HAL_SPI_Receive(&hspi1, ADC_buf, 3, 100);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_SET);
sample = (((uint16_t)ADC_buf[1] & (0b1111)) << 8) | (uint16_t)ADC_buf[2];
testdata[i] = sample;
//uart_buf_len = sprintf(uart_buf, testdata[i]);
//HAL_UART_Transmit_IT(&huart2, (uint16_t *)uart_buf, 2);
length =sprintf(boofer,"%d ",testdata[i]) + 1;
HAL_UART_Transmit(&huart2, &boofer, length, 100);
i++;
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}