Question
STM32H7S3V8T6 timer triggered DMA
Hi All,
Trying to setup timer triggered DMA for the STM32H7S3V8T6 micro and cannot seem to get it working
I have tried a number of things and eventually resorted to asking chatGPT but so far no dice... What I want to achieve
1. Timer 1 toggles CH1 output (PA8) this works
2. I want the DMA to trigger off of the TIMER_CH1 and shove the word into GPIOA->BSRR to toggle the GPIOA pins 0,1,2,3
Here's my main. c code - really stumped as to what is causing this to not work... Any thoughts??
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : STM32H7S3 GPIO output driven by TIM1 using GPDMA1 linked-list
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include <stm32h7rsxx_hal_dma_ex.h>
/* Private variables ---------------------------------------------------------*/
DMA_HandleTypeDef handle_GPDMA1_Channel0;
TIM_HandleTypeDef htim1;
/* USER CODE BEGIN PV */
ALIGN_32BYTES(uint32_t waveform[] ) = {
0x00000001, 0x00010000, // PA0 high / low
0x00000002, 0x00020000, // PA1 high / low
0x00000004, 0x00040000, // PA2 high / low
0x00000008, 0x00080000 // PA3 high / low
};
#define WAVEFORM_WORDS (sizeof(waveform)/sizeof(waveform[0]))
DMA_NodeTypeDef Node;
DMA_QListTypeDef List;
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
static void MPU_Config(void);
static void MX_GPIO_Init(void);
static void MX_GPDMA1_Init(void);
static void MX_TIM1_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
int main(void)
{
/* MPU Configuration */
MPU_Config();
/* HAL Initialization */
HAL_Init();
SystemCoreClockUpdate();
/* Initialize peripherals */
MX_GPIO_Init();
MX_GPDMA1_Init();
MX_TIM1_Init();
/* Clean D-Cache for DMA buffer */
SCB_CleanDCache_by_Addr((uint32_t*)waveform, sizeof(waveform));
/* Build DMA linked-list node */
DMA_NodeConfTypeDef NodeConfig;
NodeConfig.NodeType = DMA_GPDMA_LINEAR_NODE;
NodeConfig.Init.Request = GPDMA1_REQUEST_TIM1_CH1;
NodeConfig.Init.Direction = DMA_MEMORY_TO_PERIPH;
NodeConfig.Init.Mode = DMA_NORMAL;
NodeConfig.Init.SrcInc = DMA_SINC_INCREMENTED;
NodeConfig.Init.DestInc = DMA_DINC_FIXED;
NodeConfig.Init.SrcDataWidth = DMA_SRC_DATAWIDTH_WORD;
NodeConfig.Init.DestDataWidth = DMA_DEST_DATAWIDTH_WORD;
NodeConfig.Init.SrcBurstLength = 1;
NodeConfig.Init.DestBurstLength = 1;
NodeConfig.Init.TransferEventMode = DMA_TCEM_LAST_LL_ITEM_TRANSFER;
NodeConfig.DataHandlingConfig.DataExchange = DMA_EXCHANGE_NONE;
NodeConfig.DataHandlingConfig.DataAlignment = DMA_DATA_RIGHTALIGN_ZEROPADDED;
NodeConfig.SrcAddress = (uint32_t)waveform;
NodeConfig.DstAddress = (uint32_t)&GPIOA->BSRR;
NodeConfig.DataSize = WAVEFORM_WORDS;
if(HAL_DMAEx_List_BuildNode(&NodeConfig, &Node) != HAL_OK) Error_Handler();
if(HAL_DMAEx_List_InsertNode_Tail(&List, &Node) != HAL_OK) Error_Handler();
if(HAL_DMAEx_List_SetCircularMode(&List) != HAL_OK) Error_Handler();
/* Initialize GPDMA1 channel 0 */
handle_GPDMA1_Channel0.Instance = GPDMA1_Channel0;
handle_GPDMA1_Channel0.InitLinkedList.Priority = DMA_LOW_PRIORITY_HIGH_WEIGHT;
handle_GPDMA1_Channel0.InitLinkedList.LinkStepMode = DMA_LSM_FULL_EXECUTION;
handle_GPDMA1_Channel0.InitLinkedList.LinkedListMode = DMA_LINKEDLIST_CIRCULAR;
handle_GPDMA1_Channel0.InitLinkedList.TransferEventMode = DMA_TCEM_LAST_LL_ITEM_TRANSFER;
if(HAL_DMAEx_List_Init(&handle_GPDMA1_Channel0) != HAL_OK) Error_Handler();
if(HAL_DMAEx_List_LinkQ(&handle_GPDMA1_Channel0, &List) != HAL_OK) Error_Handler();
__HAL_LINKDMA(&htim1, hdma[TIM_DMA_ID_CC1], handle_GPDMA1_Channel0);
/* Start DMA linked-list */
if(HAL_DMAEx_List_Start_IT(&handle_GPDMA1_Channel0) != HAL_OK) Error_Handler();
/* Enable TIM1 CC1 DMA request and start timer */
__HAL_TIM_ENABLE_DMA(&htim1, TIM_DMA_CC1);
if(HAL_TIM_OC_Start(&htim1, TIM_CHANNEL_1) != HAL_OK) Error_Handler();
/* Infinite loop */
while (1) {}
}
/* GPDMA1 Initialization Function */
static void MX_GPDMA1_Init(void)
{
__HAL_RCC_GPDMA1_CLK_ENABLE();
HAL_NVIC_SetPriority(GPDMA1_Channel0_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(GPDMA1_Channel0_IRQn);
}
/* TIM1 Initialization Function */
static void MX_TIM1_Init(void)
{
TIM_ClockConfigTypeDef sClockSourceConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};
TIM_OC_InitTypeDef sConfigOC = {0};
TIM_BreakDeadTimeConfigTypeDef sBreakDeadTimeConfig = {0};
htim1.Instance = TIM1;
htim1.Init.Prescaler = 0;
htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
htim1.Init.Period = 5000;
htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim1.Init.RepetitionCounter = 0;
htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if(HAL_TIM_Base_Init(&htim1) != HAL_OK) Error_Handler();
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if(HAL_TIM_ConfigClockSource(&htim1, &sClockSourceConfig) != HAL_OK) Error_Handler();
if(HAL_TIM_OC_Init(&htim1) != HAL_OK) Error_Handler();
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterOutputTrigger2 = TIM_TRGO2_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if(HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK) Error_Handler();
sConfigOC.OCMode = TIM_OCMODE_TOGGLE;
sConfigOC.Pulse = 0;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCNPolarity = TIM_OCNPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
sConfigOC.OCIdleState = TIM_OCIDLESTATE_RESET;
sConfigOC.OCNIdleState = TIM_OCNIDLESTATE_RESET;
if(HAL_TIM_OC_ConfigChannel(&htim1, &sConfigOC, TIM_CHANNEL_1) != HAL_OK) Error_Handler();
sBreakDeadTimeConfig.OffStateRunMode = TIM_OSSR_DISABLE;
sBreakDeadTimeConfig.OffStateIDLEMode = TIM_OSSI_DISABLE;
sBreakDeadTimeConfig.LockLevel = TIM_LOCKLEVEL_OFF;
sBreakDeadTimeConfig.DeadTime = 0;
sBreakDeadTimeConfig.BreakState = TIM_BREAK_DISABLE;
sBreakDeadTimeConfig.BreakPolarity = TIM_BREAKPOLARITY_HIGH;
sBreakDeadTimeConfig.BreakFilter = 0;
sBreakDeadTimeConfig.BreakAFMode = TIM_BREAK_AFMODE_INPUT;
sBreakDeadTimeConfig.Break2State = TIM_BREAK2_DISABLE;
sBreakDeadTimeConfig.Break2Polarity = TIM_BREAK2POLARITY_HIGH;
sBreakDeadTimeConfig.Break2Filter = 0;
sBreakDeadTimeConfig.Break2AFMode = TIM_BREAK_AFMODE_INPUT;
sBreakDeadTimeConfig.AutomaticOutput = TIM_AUTOMATICOUTPUT_DISABLE;
if(HAL_TIMEx_ConfigBreakDeadTime(&htim1, &sBreakDeadTimeConfig) != HAL_OK) Error_Handler();
HAL_TIM_MspPostInit(&htim1);
}
/* GPIO Initialization Function */
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
__HAL_RCC_GPIOA_CLK_ENABLE();
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3, GPIO_PIN_RESET);
GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}
/* MPU Configuration */
static void MPU_Config(void)
{
MPU_Region_InitTypeDef MPU_InitStruct = {0};
HAL_MPU_Disable();
MPU_InitStruct.Enable = MPU_REGION_ENABLE;
MPU_InitStruct.Number = MPU_REGION_NUMBER0;
MPU_InitStruct.BaseAddress = 0x0;
MPU_InitStruct.Size = MPU_REGION_SIZE_4GB;
MPU_InitStruct.SubRegionDisable = 0x0;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
}
/* Error Handler */
void Error_Handler(void)
{
__disable_irq();
while (1) {}
}