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[ISSUE-27]: DHT22 RMT RX RAM address calculation fixed. #28

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Merged
merged 1 commit into from
Jan 29, 2025
Merged

[ISSUE-27]: DHT22 RMT RX RAM address calculation fixed. #28

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11 changes: 6 additions & 5 deletions modules/dht22.c
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Original file line number Diff line number Diff line change
Expand Up @@ -82,11 +82,12 @@ static void _rxstart(void *pvParam) {

static void _rxready(void *pvParam) {
SDht22Descriptor *psParam = (SDht22Descriptor*)pvParam;

RegAddr prData = rmt_ram_addr(psParam->eChannel, 1, 0);
uint32_t u32RecvSize = gpsRMT->asStatus[psParam->eChannel].u9RxIdx;
uint32_t u32DataOfs = u32RecvSize - (DHT22_DATA_LEN * 8) - 1;
bool bLowEnd = (prData[u32RecvSize - 1] & RMT_ENTRYMAX) == 0;
// Note, here we use _absolute_ RMT RAM addresses.
// This works fine since the received data fits into a single RMT RAM block.
RegAddr prData = rmt_ram_block(RMT_CH0);
uint32_t u32RecvEnd = gpsRMT->asStatus[psParam->eChannel].u9RxIdx;
uint32_t u32DataOfs = u32RecvEnd - (DHT22_DATA_LEN * 8) - 1;
bool bLowEnd = (prData[u32RecvEnd - 1] & RMT_ENTRYMAX) == 0;
uint8_t u8Shr = bLowEnd ? 0 : 16;

memset(&psParam->sData, 0, sizeof (psParam->sData));
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