LPBAM_Status_t LPBAM_LPTIM_FillNodeConfig(LPBAM_LPTIM_ConfNode_t const *const pConfNode,
DMA_NodeConfTypeDef *const pDMANodeConfig)
{
LPBAM_Status_t status;
LPBAM_InfoDesc_t desc_info;
...in stm32_lpbam_lptim.c leaves desc_info uninitialized and calls
LPBAM_Status_t LPBAM_LPTIM_FillStructInfo(LPBAM_LPTIM_ConfNode_t const *const pConfNode,
LPBAM_InfoDesc_t *const pDescInfo)in stm32_ll_lpbam.c with reference to desc_info.
While LPBAM_LPTIM_FillStructInfo does not set pDescInfo->Request in case of LPBAM_LPTIM_CONFIG_ID with pConfNode->Config.State != ENABLE and pConfNode->Config.Mode != LPBAM_LPTIM_UE_MODE as it can be seen in the following code snippet.
...
/* Check node ID */
switch (pConfNode->NodeDesc.NodeInfo.NodeID)
{
/* LPBAM LPTIM Update Period node ID */
case LPBAM_LPTIM_CONFIG_ID:
{
/* Get control register value */
dummy = pConfNode->pInstance->CR;
/* Check LPTIM state */
if (pConfNode->Config.State == ENABLE)
{
/* Set LPTIM update event request */
pDescInfo->Request = DMA_REQUEST_SW;
/* Set LPTIM state */
dummy |= LPTIM_CR_ENABLE;
/* Check LPTIM start mode update */
if (pConfNode->Config.UpdateStartMode == ENABLE)
{
if (pConfNode->Config.StartMode == LPBAM_LPTIM_START_SINGLE)
{
/* Configure LPTIM to start in single mode */
dummy |= LPTIM_CR_SNGSTRT;
}
else
{
/* Configure LPTIM to start in continuous mode */
dummy |= LPTIM_CR_CNTSTRT;
}
}
}
else
{
/* Set LPTIM state */
dummy &= ~(LPTIM_CR_ENABLE);
/* Check LPTIM mode */
if (pConfNode->Config.Mode == LPBAM_LPTIM_UE_MODE)
{
/* Check LPTIM instance */
if (pConfNode->pInstance == LPTIM1)
{
/* Set LPTIM1 update event request */
pDescInfo->Request = LPDMA1_REQUEST_LPTIM1_UE;
}
else
{
/* Set LPTIM3 update event request */
pDescInfo->Request = LPDMA1_REQUEST_LPTIM3_UE;
}
}
}
/* Set value to be written */
*pConfNode->NodeDesc.pSrcVarReg = dummy;
/* Set DMA source address */
pDescInfo->SrcAddr = (uint32_t)pConfNode->NodeDesc.pSrcVarReg;
/* Set DMA destination address */
pDescInfo->DstAddr = lptim_descitem_tbl[pConfNode->NodeDesc.NodeInfo.NodeID].RegOffset +
(uint32_t)pConfNode->pInstance;
/* Set DMA data size */
pDescInfo->DataSize = lptim_descitem_tbl[pConfNode->NodeDesc.NodeInfo.NodeID].RegDataSize;
break;
}
....
Later code uses Request leading to undefined behavior. The fix that worked for me was adding
...
else
{
pDescInfo->Request = DMA_REQUEST_SW;
/* Set LPTIM state */
dummy &= ~(LPTIM_CR_ENABLE);
...essentially this problem occurred when adding a lptim stop node with "not from update event detection" in cubemx lpbam scenario.
in
stm32_lpbam_lptim.cleavesdesc_infouninitialized and callsin
stm32_ll_lpbam.cwith reference todesc_info.While
LPBAM_LPTIM_FillStructInfodoes not setpDescInfo->Requestin case ofLPBAM_LPTIM_CONFIG_IDwithpConfNode->Config.State != ENABLEandpConfNode->Config.Mode != LPBAM_LPTIM_UE_MODEas it can be seen in the following code snippet.Later code uses
Requestleading to undefined behavior. The fix that worked for me was adding... else { pDescInfo->Request = DMA_REQUEST_SW; /* Set LPTIM state */ dummy &= ~(LPTIM_CR_ENABLE); ...essentially this problem occurred when adding a lptim stop node with "not from update event detection" in cubemx lpbam scenario.