STM32F446 and ADS8885 code help
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‎2020-01-26 08:12 AM
Hi
Please can someone help me with the code for STM32F446 and ADS8885 http://www.ti.com/lit/ds/sbas568a/sbas568a.pdf I'm not sure how to read the values ​​using SPI here is part of my code.
uint8_t adc_buff[3] = {0,0,0};
uint32_t adc_val = 0;
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_12, GPIO_PIN_RESET);
HAL_SPI_Receive(&hspi2, adc_buff, 3, 100);
adc_val = (adc_buff[0] << 10) | (adc_buff[1] << 2) | (adc_buff[2] & 0x03);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_12, GPIO_PIN_SET);
//SPI2 Setup
void MX_SPI2_Init(void)
{
hspi2.Instance = SPI2;
hspi2.Init.Mode = SPI_MODE_MASTER;
hspi2.Init.Direction = SPI_DIRECTION_2LINES;
hspi2.Init.DataSize = SPI_DATASIZE_8BIT;
hspi2.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi2.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi2.Init.NSS = SPI_NSS_SOFT;
hspi2.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_2;
hspi2.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi2.Init.TIMode = SPI_TIMODE_DISABLE;
hspi2.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi2.Init.CRCPolynomial = 10;
if (HAL_SPI_Init(&hspi2) != HAL_OK)
{
Error_Handler();
}
}
void HAL_SPI_MspInit(SPI_HandleTypeDef* spiHandle)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if(spiHandle->Instance==SPI2)
{
/* USER CODE BEGIN SPI2_MspInit 0 */
/* USER CODE END SPI2_MspInit 0 */
/* SPI2 clock enable */
__HAL_RCC_SPI2_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
/**SPI2 GPIO Configuration
PB13 ------> SPI2_SCK
PB14 ------> SPI2_MISO
PB15 ------> SPI2_MOSI
*/
GPIO_InitStruct.Pin = GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF5_SPI2;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
/* USER CODE BEGIN SPI2_MspInit 1 */
/* USER CODE END SPI2_MspInit 1 */
}
}
void HAL_SPI_MspDeInit(SPI_HandleTypeDef* spiHandle)
{
if(spiHandle->Instance==SPI2)
{
/* USER CODE BEGIN SPI2_MspDeInit 0 */
/* USER CODE END SPI2_MspDeInit 0 */
/* Peripheral clock disable */
__HAL_RCC_SPI2_CLK_DISABLE();
/**SPI2 GPIO Configuration
PB13 ------> SPI2_SCK
PB14 ------> SPI2_MISO
PB15 ------> SPI2_MOSI
*/
HAL_GPIO_DeInit(GPIOB, GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15);
/* USER CODE BEGIN SPI2_MspDeInit 1 */
/* USER CODE END SPI2_MspDeInit 1 */
}
}
- Labels:
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SPI
-
STM32F4 Series
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‎2020-01-27 01:50 PM
What is the observed behaviour? What are the waveforms on the SPI pins of the ADS8885? Do they match the description in the ADS8885 datasheet?
JW
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‎2020-01-27 04:16 PM
Hi
Manage it strangely when I connect pin 4 of AINN to GND so it works it doesn't work only in True-Differential when I use both AINP and AINN inputs.
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‎2020-01-28 07:18 PM
Hi
I'm adding a few photos that show my problem with ADC in the first two photos is ADC without the input signal on the other two is the signal OK until it exceeds a certain value and then the output data will start to deform as seen in the last two photos. The signal displayed on the Oscilloscope is measured on 3.4 ADC pins.
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‎2020-01-29 02:49 PM
Looks like signed values interpreted as unsigned.
JW