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fix(wire): ensure i2c bus is ready#1775

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Merged
fpistm merged 1 commit intostm32duino:mainfromfpistm:i2c_err
Jul 29, 2022
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42 changes: 36 additions & 6 deletionslibraries/Wire/src/utility/twi.c
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Original file line numberDiff line numberDiff line change
Expand Up@@ -848,6 +848,7 @@ i2c_status_e i2c_master_write(i2c_t *obj, uint8_t dev_address,
uint32_ttickstart=HAL_GetTick();
uint32_tdelta=0;
uint32_terr=0;
HAL_StatusTypeDefstatus=HAL_OK;

/* When size is 0, this is usually an I2C scan / ping to check if device is there and ready */
if (size==0) {
Expand All@@ -856,12 +857,26 @@ i2c_status_e i2c_master_write(i2c_t *obj, uint8_t dev_address,
#if defined(I2C_OTHER_FRAME)
uint32_tXferOptions=obj->handle.XferOptions;// save XferOptions value, because handle can be modified by HAL, which cause issue in case of NACK from slave
#endif

do {
#if defined(I2C_OTHER_FRAME)
if (HAL_I2C_Master_Seq_Transmit_IT(&(obj->handle),dev_address,data,size,XferOptions)==HAL_OK) {
status=HAL_I2C_Master_Seq_Transmit_IT(&(obj->handle),dev_address,data,size,XferOptions);
#else
if (HAL_I2C_Master_Transmit_IT(&(obj->handle),dev_address,data,size)==HAL_OK) {
status=HAL_I2C_Master_Transmit_IT(&(obj->handle),dev_address,data,size);
#endif
// Ensure i2c ready
if (status==HAL_BUSY) {
delta= (HAL_GetTick()-tickstart);
if (delta>I2C_TIMEOUT_TICK) {
ret=I2C_BUSY;
break;
}
}else {
ret= (status==HAL_OK) ?I2C_OK :I2C_ERROR;
}
}while (status==HAL_BUSY);

if (ret==I2C_OK) {
tickstart=HAL_GetTick();
// wait for transfer completion
while ((HAL_I2C_GetState(&(obj->handle))!=HAL_I2C_STATE_READY)&& (delta<I2C_TIMEOUT_TICK)) {
delta= (HAL_GetTick()-tickstart);
Expand DownExpand Up@@ -926,16 +941,31 @@ i2c_status_e i2c_master_read(i2c_t *obj, uint8_t dev_address, uint8_t *data, uin
uint32_ttickstart=HAL_GetTick();
uint32_tdelta=0;
uint32_terr=0;
HAL_StatusTypeDefstatus=HAL_OK;

#if defined(I2C_OTHER_FRAME)
uint32_tXferOptions=obj->handle.XferOptions;// save XferOptions value, because handle can be modified by HAL, which cause issue in case of NACK from slave
#endif

do {
#if defined(I2C_OTHER_FRAME)
if (HAL_I2C_Master_Seq_Receive_IT(&(obj->handle),dev_address,data,size,XferOptions)==HAL_OK) {
status=HAL_I2C_Master_Seq_Receive_IT(&(obj->handle),dev_address,data,size,XferOptions);
#else
if (HAL_I2C_Master_Receive_IT(&(obj->handle),dev_address,data,size)==HAL_OK) {
status=HAL_I2C_Master_Receive_IT(&(obj->handle),dev_address,data,size);
#endif
// Ensure i2c ready
if (status==HAL_BUSY) {
delta= (HAL_GetTick()-tickstart);
if (delta>I2C_TIMEOUT_TICK) {
ret=I2C_BUSY;
break;
}
}else {
ret= (status==HAL_OK) ?I2C_OK :I2C_ERROR;
}
}while (status==HAL_BUSY);

if (ret==I2C_OK) {
tickstart=HAL_GetTick();
// wait for transfer completion
while ((HAL_I2C_GetState(&(obj->handle))!=HAL_I2C_STATE_READY)&& (delta<I2C_TIMEOUT_TICK)) {
delta= (HAL_GetTick()-tickstart);
Expand Down
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