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Starting FMAC kills Systick in STM32G431
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2024-08-02 11:35 AM
I have the STM32G431 set up to sample ADC2, send the data to the FMAC and then out to DAC1. It works fine, I have tested all kinds of filters with it. However, none of the HAL functions that use SysTick work after I start the FMAC.
I'm using the small NUCLEO board. With the attached code, only "St" gets transmitted in the HAL_UART_Transmit call and the LD2 LED only blink once. However, if I just comment out the HAL_FMAC_FilterStart line, the LD2 LED blinks and the full "Starting..." message gets transmitted. The FMAC obviously stops working after that line is commented out.
I have tried re-creating the project several times and I get the same result. I've tried changing the priorities of the System tick timer and DMA interrupts without any success. I'm not seeing anything in the HAL_FMAC_FilterStart function that should affect SysTick.
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#define FILTER_OUT_BUFFER_SIZE 1
#define FILTER_IN_BUFFER_SIZE 1
#define FILTER_TAP 127
#define TXBUFFERSIZE 60 // UART TX buffer size
#define DLY_1S 1000 // 1 second delay (1000 microseconds)
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
ADC_HandleTypeDef hadc2;
DMA_HandleTypeDef hdma_adc2;
DAC_HandleTypeDef hdac1;
DMA_HandleTypeDef hdma_dac1_ch1;
FMAC_HandleTypeDef hfmac;
DMA_HandleTypeDef hdma_fmac_read;
TIM_HandleTypeDef htim7;
UART_HandleTypeDef huart2;
/* USER CODE BEGIN PV */
uint16_t ADC_data[FILTER_IN_BUFFER_SIZE]; // Data from ADC
uint16_t FMAC_out[FILTER_OUT_BUFFER_SIZE]; // Filter output data
/* https://fiiir.com/
*
* Low pass (windowed-sinc FIR)
* Window type: Blackman
* Sampling rate: 100kHz
* Cutoff: 25kHz
* Transition bandwidth: 3.65kHz
* Number of coefficients: 127
*
* Notes:
* -Coefficients must be in q1.15 format. -> value_q15 = (int16_t)(value_f32*0x8000)
* -Maximum 127 taps
*
* PROBABLY THE BEST AT 100KHZ!
*/
static int16_t FilterCoeffB[127] =
{0,0,0,0,-1,0,2,0,-3,0,5,0,-7,0,11,0,-15,0,21,0,-28,0,37,0,-48,0,61,0,-77,0,96,0,
-119,0,146,0,-177,0,215,0,-260,0,313,0,-377,0,455,0,-551,0,674,0,-837,0,1067,0,
-1417,0,2033,0,-3445,0,10420,16384,10420,0,-3445,0,2033,0,-1417,0,1067,0,-837,0,
674,0,-551,0,455,0,-377,0,313,0,-260,0,215,0,-177,0,146,0,-119,0,96,0,-77,0,61,
0,-48,0,37,0,-28,0,21,0,-15,0,11,0,-7,0,5,0,-3,0,2,0,-1,0,0,0,0
};
uint8_t TxBuffer[200];
int TxBufSize;
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_USART2_UART_Init(void);
static void MX_DAC1_Init(void);
static void MX_FMAC_Init(void);
static void MX_TIM7_Init(void);
static void MX_ADC2_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 */
/* 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_DMA_Init();
MX_USART2_UART_Init();
MX_DAC1_Init();
MX_FMAC_Init();
MX_TIM7_Init();
MX_ADC2_Init();
/* USER CODE BEGIN 2 */
uint16_t Filter_output_Size = FILTER_OUT_BUFFER_SIZE;
HAL_FMAC_FilterStart(&hfmac, (int16_t*)&FMAC_out, &Filter_output_Size); // Running the filter
HAL_ADCEx_Calibration_Start(&hadc2, ADC_SINGLE_ENDED); // Calibrating the ADC
HAL_ADC_Start_DMA(&hadc2, (uint32_t*)&FMAC->WDATA, FILTER_IN_BUFFER_SIZE); // We launch the ADC with DMA storage using the pointer to FMAC->WDATA
HAL_DAC_Start_DMA(&hdac1, DAC_CHANNEL_1, (uint32_t*)&FMAC_out, FILTER_OUT_BUFFER_SIZE, DAC_ALIGN_12B_R); // We output the input data of the FIR filter to the DAC
HAL_TIM_Base_Start(&htim7); // Start the timer
TxBufSize = sprintf(TxBuffer,"Starting...\n\r");
HAL_UART_Transmit(&huart2, TxBuffer, TxBufSize, DLY_1S);
HAL_Delay(1);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
HAL_GPIO_WritePin(LD2_GPIO_Port, LD2_Pin, GPIO_PIN_SET);
HAL_Delay(200);
HAL_GPIO_WritePin(LD2_GPIO_Port, LD2_Pin, GPIO_PIN_RESET);
HAL_Delay(200);
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Configure the main internal regulator output voltage
*/
HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV2;
RCC_OscInitStruct.PLL.PLLN = 25;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)
{
Error_Handler();
}
}
/**
* @brief ADC2 Initialization Function
* @PAram None
* @retval None
*/
static void MX_ADC2_Init(void)
{
/* USER CODE BEGIN ADC2_Init 0 */
/* USER CODE END ADC2_Init 0 */
ADC_ChannelConfTypeDef sConfig = {0};
/* USER CODE BEGIN ADC2_Init 1 */
/* USER CODE END ADC2_Init 1 */
/** Common config
*/
hadc2.Instance = ADC2;
hadc2.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;
hadc2.Init.Resolution = ADC_RESOLUTION_12B;
hadc2.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc2.Init.GainCompensation = 0;
hadc2.Init.ScanConvMode = ADC_SCAN_DISABLE;
hadc2.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc2.Init.LowPowerAutoWait = DISABLE;
hadc2.Init.ContinuousConvMode = DISABLE;
hadc2.Init.NbrOfConversion = 1;
hadc2.Init.DiscontinuousConvMode = DISABLE;
hadc2.Init.ExternalTrigConv = ADC_EXTERNALTRIG_T7_TRGO;
hadc2.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING;
hadc2.Init.DMAContinuousRequests = ENABLE;
hadc2.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;
hadc2.Init.OversamplingMode = DISABLE;
if (HAL_ADC_Init(&hadc2) != HAL_OK)
{
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Channel = ADC_CHANNEL_4;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_2CYCLES_5;
sConfig.SingleDiff = ADC_SINGLE_ENDED;
sConfig.OffsetNumber = ADC_OFFSET_NONE;
sConfig.Offset = 0;
if (HAL_ADC_ConfigChannel(&hadc2, &sConfig) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN ADC2_Init 2 */
/* USER CODE END ADC2_Init 2 */
}
/**
* @brief DAC1 Initialization Function
* @PAram None
* @retval None
*/
static void MX_DAC1_Init(void)
{
/* USER CODE BEGIN DAC1_Init 0 */
/* USER CODE END DAC1_Init 0 */
DAC_ChannelConfTypeDef sConfig = {0};
/* USER CODE BEGIN DAC1_Init 1 */
/* USER CODE END DAC1_Init 1 */
/** DAC Initialization
*/
hdac1.Instance = DAC1;
if (HAL_DAC_Init(&hdac1) != HAL_OK)
{
Error_Handler();
}
/** DAC channel OUT1 config
*/
sConfig.DAC_HighFrequency = DAC_HIGH_FREQUENCY_INTERFACE_MODE_AUTOMATIC;
sConfig.DAC_DMADoubleDataMode = DISABLE;
sConfig.DAC_SignedFormat = ENABLE;
sConfig.DAC_SampleAndHold = DAC_SAMPLEANDHOLD_DISABLE;
sConfig.DAC_Trigger = DAC_TRIGGER_T7_TRGO;
sConfig.DAC_Trigger2 = DAC_TRIGGER_NONE;
sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
sConfig.DAC_ConnectOnChipPeripheral = DAC_CHIPCONNECT_EXTERNAL;
sConfig.DAC_UserTrimming = DAC_TRIMMING_FACTORY;
if (HAL_DAC_ConfigChannel(&hdac1, &sConfig, DAC_CHANNEL_1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN DAC1_Init 2 */
/* USER CODE END DAC1_Init 2 */
}
/**
* @brief FMAC Initialization Function
* @PAram None
* @retval None
*/
static void MX_FMAC_Init(void)
{
/* USER CODE BEGIN FMAC_Init 0 */
/* USER CODE END FMAC_Init 0 */
/* USER CODE BEGIN FMAC_Init 1 */
/* USER CODE END FMAC_Init 1 */
hfmac.Instance = FMAC;
if (HAL_FMAC_Init(&hfmac) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN FMAC_Init 2 */
FMAC_FilterConfigTypeDef sFmacConfig; // declare a filter configuration structure
sFmacConfig.CoeffBaseAddress = 0; // Set the coefficient buffer base address
sFmacConfig.CoeffBufferSize = FILTER_TAP; // Set the coefficient buffer size to the number of coeffs
sFmacConfig.InputBaseAddress = FILTER_TAP; // Set the Input buffer base address to the next free address
sFmacConfig.InputBufferSize = FILTER_TAP + 1; // Set the input buffer size greater than the number of coeffs
sFmacConfig.InputThreshold = 0; // Set the input watermark to zero since we are using DMA
sFmacConfig.OutputBaseAddress = FILTER_TAP*2 + 1; // Set the Output buffer base address to the next free address
sFmacConfig.OutputBufferSize = FILTER_OUT_BUFFER_SIZE; // Set the output buffer size
sFmacConfig.OutputThreshold = 0; // Set the output watermark to zero since we are using DMA
sFmacConfig.pCoeffA = NULL; // No A coefficients since FIR
sFmacConfig.CoeffASize = 0;
sFmacConfig.pCoeffB = FilterCoeffB; // Pointer to the coefficients in memory
sFmacConfig.CoeffBSize = FILTER_TAP; // Number of coefficients
sFmacConfig.Filter = FMAC_FUNC_CONVO_FIR; // Select FIR filter function
sFmacConfig.InputAccess = FMAC_BUFFER_ACCESS_NONE; // Disable DMA input transfer
sFmacConfig.OutputAccess = FMAC_BUFFER_ACCESS_DMA; // Enable DMA output transfer
sFmacConfig.Clip = FMAC_CLIP_ENABLED; // Enable clipping of the output at 0x7FFF and 0x8000
sFmacConfig.P = FILTER_TAP; // P parameter contains number of coefficients
sFmacConfig.Q = 0; // Q parameter is not used
sFmacConfig.R = 0; // R parameter contains the post-shift value (none)
if (HAL_FMAC_FilterConfig(&hfmac, &sFmacConfig) != HAL_OK) // Configure the FMAC
Error_Handler(); // Configuration Error
/* USER CODE END FMAC_Init 2 */
}
/**
* @brief TIM7 Initialization Function
* @PAram None
* @retval None
*/
static void MX_TIM7_Init(void)
{
/* USER CODE BEGIN TIM7_Init 0 */
/* USER CODE END TIM7_Init 0 */
TIM_MasterConfigTypeDef sMasterConfig = {0};
/* USER CODE BEGIN TIM7_Init 1 */
/* USER CODE END TIM7_Init 1 */
htim7.Instance = TIM7;
htim7.Init.Prescaler = 0;
htim7.Init.CounterMode = TIM_COUNTERMODE_UP;
htim7.Init.Period = 999;
htim7.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_Base_Init(&htim7) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim7, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN TIM7_Init 2 */
/* USER CODE END TIM7_Init 2 */
}
/**
* @brief USART2 Initialization Function
* @PAram None
* @retval None
*/
static void MX_USART2_UART_Init(void)
{
/* USER CODE BEGIN USART2_Init 0 */
/* USER CODE END USART2_Init 0 */
/* USER CODE BEGIN USART2_Init 1 */
/* USER CODE END USART2_Init 1 */
huart2.Instance = USART2;
huart2.Init.BaudRate = 9600;
huart2.Init.WordLength = UART_WORDLENGTH_8B;
huart2.Init.StopBits = UART_STOPBITS_1;
huart2.Init.Parity = UART_PARITY_NONE;
huart2.Init.Mode = UART_MODE_TX_RX;
huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart2.Init.OverSampling = UART_OVERSAMPLING_16;
huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
huart2.Init.ClockPrescaler = UART_PRESCALER_DIV1;
huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if (HAL_UART_Init(&huart2) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_SetTxFifoThreshold(&huart2, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_SetRxFifoThreshold(&huart2, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_DisableFifoMode(&huart2) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN USART2_Init 2 */
/* USER CODE END USART2_Init 2 */
}
/**
* Enable DMA controller clock
*/
static void MX_DMA_Init(void)
{
/* DMA controller clock enable */
__HAL_RCC_DMAMUX1_CLK_ENABLE();
__HAL_RCC_DMA1_CLK_ENABLE();
/* DMA interrupt init */
/* DMA1_Channel1_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);
/* DMA1_Channel2_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA1_Channel2_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Channel2_IRQn);
/* DMA1_Channel3_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA1_Channel3_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Channel3_IRQn);
}
/**
* @brief GPIO Initialization Function
* @PAram None
* @retval None
*/
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* USER CODE BEGIN MX_GPIO_Init_1 */
/* USER CODE END MX_GPIO_Init_1 */
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(LD2_GPIO_Port, LD2_Pin, GPIO_PIN_RESET);
/*Configure GPIO pin : LD2_Pin */
GPIO_InitStruct.Pin = LD2_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(LD2_GPIO_Port, &GPIO_InitStruct);
/* USER CODE BEGIN MX_GPIO_Init_2 */
/* USER CODE END MX_GPIO_Init_2 */
}
/* USER CODE BEGIN 4 */
/* USER CODE END 4 */
/**
* @brief This function is executed in case of error occurrence.
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
__disable_irq();
while (1)
{
}
/* USER CODE END Error_Handler_Debug */
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @PAram file: pointer to the source file name
* @PAram line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* USER CODE BEGIN 6 */
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
HAL_StatusTypeDef HAL_FMAC_FilterStart(FMAC_HandleTypeDef *hfmac, int16_t *pOutput, uint16_t *pOutputSize)
{
uint32_t tmpcr = 0U;
HAL_StatusTypeDef status;
/* Check the START bit state */
if (FMAC_GET_START_BIT(hfmac) != 0U)
{
return HAL_ERROR;
}
/* Check that a valid configuration was done previously */
if (hfmac->FilterParam == 0U)
{
return HAL_ERROR;
}
/* Check handle state is ready */
if (hfmac->State == HAL_FMAC_STATE_READY)
{
/* Change the FMAC state */
hfmac->State = HAL_FMAC_STATE_BUSY;
/* CR: Configure the input access (error interruptions enabled only for IT or DMA) */
if (hfmac->InputAccess == FMAC_BUFFER_ACCESS_DMA)
{
tmpcr |= FMAC_DMA_WEN;
}
else if (hfmac->InputAccess == FMAC_BUFFER_ACCESS_IT)
{
tmpcr |= FMAC_IT_WIEN;
}
else
{
/* nothing to do */
}
/* CR: Configure the output access (error interruptions enabled only for IT or DMA) */
if (hfmac->OutputAccess == FMAC_BUFFER_ACCESS_DMA)
{
tmpcr |= FMAC_DMA_REN;
}
else if (hfmac->OutputAccess == FMAC_BUFFER_ACCESS_IT)
{
tmpcr |= FMAC_IT_RIEN;
}
else
{
/* nothing to do */
}
/* CR: Write the configuration */
MODIFY_REG(hfmac->Instance->CR, \
FMAC_IT_RIEN | FMAC_IT_WIEN | FMAC_DMA_REN | FMAC_CR_DMAWEN, \
tmpcr);
/* Register the new output buffer */
status = FMAC_ConfigFilterOutputBufferUpdateState(hfmac, pOutput, pOutputSize);
if (status == HAL_OK)
{
/* PARAM: Start the filter ( this can generate interrupts before the end of the HAL_FMAC_FilterStart ) */
WRITE_REG(hfmac->Instance->PARAM, (uint32_t)(hfmac->FilterParam));
}
/* Reset the busy flag (do not overwrite the possible write and read flag) */
hfmac->State = HAL_FMAC_STATE_READY;
}
else
{
status = HAL_ERROR;
}
return status;
}
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2024-08-02 12:50 PM - edited 2024-08-02 12:51 PM
> sConfig.SamplingTime = ADC_SAMPLETIME_2CYCLES_5;
Try increasing sampling time to max.
Where is hdma_adc2 getting initialized? I don't see it in your code anywhere.
Should be able to debug, run, hit pause, see where code is at. Likely it's stuck in interrupts that happen so fast it can't make any progress.
If you feel a post has answered your question, please click "Accept as Solution".
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2024-08-02 12:50 PM - edited 2024-08-02 12:51 PM
> sConfig.SamplingTime = ADC_SAMPLETIME_2CYCLES_5;
Try increasing sampling time to max.
Where is hdma_adc2 getting initialized? I don't see it in your code anywhere.
Should be able to debug, run, hit pause, see where code is at. Likely it's stuck in interrupts that happen so fast it can't make any progress.
If you feel a post has answered your question, please click "Accept as Solution".
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2024-08-02 01:22 PM
Yes, something was maxed out. Increasing the sample time got things working, but at a lower sampling rate. In order to maintain the 100kHz sampling rate, I had to up the clock to 170MHz from 100MHz.
Guessing this is an issue due to the way the ADC is feeding the samples to the FMAC one at a time.
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