[HAL][I2C] Update HAL I2C driver to prefetch data before starting the transmission: implementation of errata sheet workaround I2C2-190208 : Transmission stalled after first byte
diff --git a/Src/stm32l0xx_hal_i2c.c b/Src/stm32l0xx_hal_i2c.c
index 1bff29d..842d865 100644
--- a/Src/stm32l0xx_hal_i2c.c
+++ b/Src/stm32l0xx_hal_i2c.c
@@ -1115,6 +1115,7 @@
uint16_t Size, uint32_t Timeout)
{
uint32_t tickstart;
+ uint32_t xfermode;
if (hi2c->State == HAL_I2C_STATE_READY)
{
@@ -1138,18 +1139,39 @@
hi2c->XferCount = Size;
hi2c->XferISR = NULL;
- /* Send Slave Address */
- /* Set NBYTES to write and reload if hi2c->XferCount > MAX_NBYTE_SIZE and generate RESTART */
if (hi2c->XferCount > MAX_NBYTE_SIZE)
{
hi2c->XferSize = MAX_NBYTE_SIZE;
- I2C_TransferConfig(hi2c, DevAddress, (uint8_t)hi2c->XferSize, I2C_RELOAD_MODE,
- I2C_GENERATE_START_WRITE);
+ xfermode = I2C_RELOAD_MODE;
}
else
{
hi2c->XferSize = hi2c->XferCount;
- I2C_TransferConfig(hi2c, DevAddress, (uint8_t)hi2c->XferSize, I2C_AUTOEND_MODE,
+ xfermode = I2C_AUTOEND_MODE;
+ }
+
+ if (hi2c->XferSize > 0U)
+ {
+ /* Preload TX register */
+ /* Write data to TXDR */
+ hi2c->Instance->TXDR = *hi2c->pBuffPtr;
+
+ /* Increment Buffer pointer */
+ hi2c->pBuffPtr++;
+
+ hi2c->XferCount--;
+ hi2c->XferSize--;
+
+ /* Send Slave Address */
+ /* Set NBYTES to write and reload if hi2c->XferCount > MAX_NBYTE_SIZE and generate RESTART */
+ I2C_TransferConfig(hi2c, DevAddress, (uint8_t)(hi2c->XferSize + 1U), xfermode,
+ I2C_GENERATE_START_WRITE);
+ }
+ else
+ {
+ /* Send Slave Address */
+ /* Set NBYTES to write and reload if hi2c->XferCount > MAX_NBYTE_SIZE and generate RESTART */
+ I2C_TransferConfig(hi2c, DevAddress, (uint8_t)hi2c->XferSize, xfermode,
I2C_GENERATE_START_WRITE);
}
@@ -1672,7 +1694,26 @@
/* Send Slave Address */
/* Set NBYTES to write and reload if hi2c->XferCount > MAX_NBYTE_SIZE */
- I2C_TransferConfig(hi2c, DevAddress, (uint8_t)hi2c->XferSize, xfermode, I2C_GENERATE_START_WRITE);
+ if (hi2c->XferSize > 0U)
+ {
+ /* Preload TX register */
+ /* Write data to TXDR */
+ hi2c->Instance->TXDR = *hi2c->pBuffPtr;
+
+ /* Increment Buffer pointer */
+ hi2c->pBuffPtr++;
+
+ hi2c->XferCount--;
+ hi2c->XferSize--;
+
+ I2C_TransferConfig(hi2c, DevAddress, (uint8_t)(hi2c->XferSize + 1U), xfermode,
+ I2C_GENERATE_START_WRITE);
+ }
+ else
+ {
+ I2C_TransferConfig(hi2c, DevAddress, (uint8_t)hi2c->XferSize, xfermode,
+ I2C_GENERATE_START_WRITE);
+ }
/* Process Unlocked */
__HAL_UNLOCK(hi2c);
@@ -1895,6 +1936,7 @@
{
uint32_t xfermode;
HAL_StatusTypeDef dmaxferstatus;
+ uint32_t sizetoxfer = 0U;
if (hi2c->State == HAL_I2C_STATE_READY)
{
@@ -1929,6 +1971,20 @@
if (hi2c->XferSize > 0U)
{
+ /* Preload TX register */
+ /* Write data to TXDR */
+ hi2c->Instance->TXDR = *hi2c->pBuffPtr;
+
+ /* Increment Buffer pointer */
+ hi2c->pBuffPtr++;
+
+ sizetoxfer = hi2c->XferSize;
+ hi2c->XferCount--;
+ hi2c->XferSize--;
+ }
+
+ if (hi2c->XferSize > 0U)
+ {
if (hi2c->hdmatx != NULL)
{
/* Set the I2C DMA transfer complete callback */
@@ -1942,7 +1998,7 @@
hi2c->hdmatx->XferAbortCallback = NULL;
/* Enable the DMA channel */
- dmaxferstatus = HAL_DMA_Start_IT(hi2c->hdmatx, (uint32_t)pData, (uint32_t)&hi2c->Instance->TXDR,
+ dmaxferstatus = HAL_DMA_Start_IT(hi2c->hdmatx, (uint32_t)hi2c->pBuffPtr, (uint32_t)&hi2c->Instance->TXDR,
hi2c->XferSize);
}
else
@@ -1964,7 +2020,7 @@
{
/* Send Slave Address */
/* Set NBYTES to write and reload if hi2c->XferCount > MAX_NBYTE_SIZE and generate RESTART */
- I2C_TransferConfig(hi2c, DevAddress, (uint8_t)hi2c->XferSize, xfermode, I2C_GENERATE_START_WRITE);
+ I2C_TransferConfig(hi2c, DevAddress, (uint8_t)(hi2c->XferSize + 1U), xfermode, I2C_GENERATE_START_WRITE);
/* Update XferCount value */
hi2c->XferCount -= hi2c->XferSize;
@@ -2003,7 +2059,7 @@
/* Send Slave Address */
/* Set NBYTES to write and generate START condition */
- I2C_TransferConfig(hi2c, DevAddress, (uint8_t)hi2c->XferSize, I2C_AUTOEND_MODE,
+ I2C_TransferConfig(hi2c, DevAddress, (uint8_t)sizetoxfer, I2C_AUTOEND_MODE,
I2C_GENERATE_START_WRITE);
/* Process Unlocked */
@@ -3313,6 +3369,7 @@
{
uint32_t xfermode;
uint32_t xferrequest = I2C_GENERATE_START_WRITE;
+ uint32_t sizetoxfer = 0U;
/* Check the parameters */
assert_param(IS_I2C_TRANSFER_OPTIONS_REQUEST(XferOptions));
@@ -3344,6 +3401,20 @@
xfermode = hi2c->XferOptions;
}
+ if ((hi2c->XferSize > 0U) && ((XferOptions == I2C_FIRST_FRAME) || (XferOptions == I2C_FIRST_AND_LAST_FRAME)))
+ {
+ /* Preload TX register */
+ /* Write data to TXDR */
+ hi2c->Instance->TXDR = *hi2c->pBuffPtr;
+
+ /* Increment Buffer pointer */
+ hi2c->pBuffPtr++;
+
+ sizetoxfer = hi2c->XferSize;
+ hi2c->XferCount--;
+ hi2c->XferSize--;
+ }
+
/* If transfer direction not change and there is no request to start another frame,
do not generate Restart Condition */
/* Mean Previous state is same as current state */
@@ -3365,7 +3436,14 @@
}
/* Send Slave Address and set NBYTES to write */
- I2C_TransferConfig(hi2c, DevAddress, (uint8_t)hi2c->XferSize, xfermode, xferrequest);
+ if ((XferOptions == I2C_FIRST_FRAME) || (XferOptions == I2C_FIRST_AND_LAST_FRAME))
+ {
+ I2C_TransferConfig(hi2c, DevAddress, (uint8_t)sizetoxfer, xfermode, xferrequest);
+ }
+ else
+ {
+ I2C_TransferConfig(hi2c, DevAddress, (uint8_t)hi2c->XferSize, xfermode, xferrequest);
+ }
/* Process Unlocked */
__HAL_UNLOCK(hi2c);
@@ -3405,6 +3483,7 @@
uint32_t xfermode;
uint32_t xferrequest = I2C_GENERATE_START_WRITE;
HAL_StatusTypeDef dmaxferstatus;
+ uint32_t sizetoxfer = 0U;
/* Check the parameters */
assert_param(IS_I2C_TRANSFER_OPTIONS_REQUEST(XferOptions));
@@ -3436,6 +3515,20 @@
xfermode = hi2c->XferOptions;
}
+ if ((hi2c->XferSize > 0U) && ((XferOptions == I2C_FIRST_FRAME) || (XferOptions == I2C_FIRST_AND_LAST_FRAME)))
+ {
+ /* Preload TX register */
+ /* Write data to TXDR */
+ hi2c->Instance->TXDR = *hi2c->pBuffPtr;
+
+ /* Increment Buffer pointer */
+ hi2c->pBuffPtr++;
+
+ sizetoxfer = hi2c->XferSize;
+ hi2c->XferCount--;
+ hi2c->XferSize--;
+ }
+
/* If transfer direction not change and there is no request to start another frame,
do not generate Restart Condition */
/* Mean Previous state is same as current state */
@@ -3471,7 +3564,7 @@
hi2c->hdmatx->XferAbortCallback = NULL;
/* Enable the DMA channel */
- dmaxferstatus = HAL_DMA_Start_IT(hi2c->hdmatx, (uint32_t)pData, (uint32_t)&hi2c->Instance->TXDR,
+ dmaxferstatus = HAL_DMA_Start_IT(hi2c->hdmatx, (uint32_t)hi2c->pBuffPtr, (uint32_t)&hi2c->Instance->TXDR,
hi2c->XferSize);
}
else
@@ -3492,7 +3585,14 @@
if (dmaxferstatus == HAL_OK)
{
/* Send Slave Address and set NBYTES to write */
- I2C_TransferConfig(hi2c, DevAddress, (uint8_t)hi2c->XferSize, xfermode, xferrequest);
+ if ((XferOptions == I2C_FIRST_FRAME) || (XferOptions == I2C_FIRST_AND_LAST_FRAME))
+ {
+ I2C_TransferConfig(hi2c, DevAddress, (uint8_t)sizetoxfer, xfermode, xferrequest);
+ }
+ else
+ {
+ I2C_TransferConfig(hi2c, DevAddress, (uint8_t)hi2c->XferSize, xfermode, xferrequest);
+ }
/* Update XferCount value */
hi2c->XferCount -= hi2c->XferSize;
@@ -3531,8 +3631,14 @@
/* Send Slave Address */
/* Set NBYTES to write and generate START condition */
- I2C_TransferConfig(hi2c, DevAddress, (uint8_t)hi2c->XferSize, I2C_AUTOEND_MODE,
- I2C_GENERATE_START_WRITE);
+ if ((XferOptions == I2C_FIRST_FRAME) || (XferOptions == I2C_FIRST_AND_LAST_FRAME))
+ {
+ I2C_TransferConfig(hi2c, DevAddress, (uint8_t)sizetoxfer, xfermode, xferrequest);
+ }
+ else
+ {
+ I2C_TransferConfig(hi2c, DevAddress, (uint8_t)hi2c->XferSize, xfermode, xferrequest);
+ }
/* Process Unlocked */
__HAL_UNLOCK(hi2c);
@@ -4842,17 +4948,22 @@
hi2c->XferSize--;
hi2c->XferCount--;
}
- else if ((I2C_CHECK_FLAG(tmpITFlags, I2C_FLAG_TXIS) != RESET) && \
- (I2C_CHECK_IT_SOURCE(ITSources, I2C_IT_TXI) != RESET))
+ else if ((I2C_CHECK_FLAG(tmpITFlags, I2C_FLAG_TC) == RESET) && \
+ ((I2C_CHECK_FLAG(tmpITFlags, I2C_FLAG_TXIS) != RESET) && \
+ (I2C_CHECK_IT_SOURCE(ITSources, I2C_IT_TXI) != RESET)))
{
/* Write data to TXDR */
- hi2c->Instance->TXDR = *hi2c->pBuffPtr;
+ if (hi2c->XferCount != 0U)
+ {
+ /* Write data to TXDR */
+ hi2c->Instance->TXDR = *hi2c->pBuffPtr;
- /* Increment Buffer pointer */
- hi2c->pBuffPtr++;
+ /* Increment Buffer pointer */
+ hi2c->pBuffPtr++;
- hi2c->XferSize--;
- hi2c->XferCount--;
+ hi2c->XferSize--;
+ hi2c->XferCount--;
+ }
}
else if ((I2C_CHECK_FLAG(tmpITFlags, I2C_FLAG_TCR) != RESET) && \
(I2C_CHECK_IT_SOURCE(ITSources, I2C_IT_TCI) != RESET))
