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Code Issues Releases Activity

Small fix: Write operations did have to time out before a new could be started

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git-svn-id: svn://svn.openpilot.org/OpenPilot/trunk@225 ebee16cc-31ac-478f-84a7-5cbb03baadba
This commit is contained in:
FredericG 2010-03-02 18:33:19 +00:00 committed by FredericG
parent 59dbc21410
commit b205ebd873
1 changed files with 41 additions and 4 deletions
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45
flight/PiOS/STM32F10x/pios_i2c.c
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@ -32,6 +32,9 @@
#if !defined(PIOS_DONT_USE_I2C)
/* Options */
//#define USE_DEBUG_PINS
/* Global Variables */
volatile uint32_t PIOS_I2C_UnexpectedEvent;
@ -73,6 +76,17 @@ static void ER_IRQHandler(I2CRecTypeDef *i2cx);
/* Local Variables */
static I2CRecTypeDef I2CRec;
/* Macros */
#ifdef USE_DEBUG_PINS
#define DEBUG_PIN_ISR 0
#define DEBUG_PIN_BUSY 1
#define DebugPinHigh(x) PIOS_DEBUG_PinHigh(x)
#define DebugPinLow(x) PIOS_DEBUG_PinLow(x)
#else
#define DebugPinHigh(x)
#define DebugPinLow(x)
#endif
/**
* Initializes IIC driver
* \param[in] mode currently only mode 0 supported
@ -147,6 +161,7 @@ static void PIOS_I2C_InitPeripheral(void)
/* Clear transfer state and error value */
i2cx->transfer_state.ALL = 0;
PIOS_DEBUG_PinLow(0);
i2cx->transfer_error = 0;
/* Configure I2C peripheral */
@ -162,7 +177,7 @@ static void PIOS_I2C_InitPeripheral(void)
*/
int32_t PIOS_I2C_TransferBegin(I2CSemaphoreTypeDef semaphore_type)
{
I2CRecTypeDef *i2cx = &I2CRec;
volatile I2CRecTypeDef *i2cx = &I2CRec;
int32_t status = -1;
do {
@ -324,6 +339,9 @@ int32_t PIOS_I2C_Transfer(I2CTransferTypeDef transfer, uint8_t address, uint8_t
return error + I2C_ERROR_PREV_OFFSET;
}
DebugPinLow(DEBUG_PIN_BUSY);
i2cx->transfer_state.BUSY = 0;
/* Disable interrupts */
I2C_ITConfig(i2cx->base, I2C_IT_EVT | I2C_IT_BUF | I2C_IT_ERR, DISABLE);
@ -365,6 +383,7 @@ int32_t PIOS_I2C_Transfer(I2CTransferTypeDef transfer, uint8_t address, uint8_t
i2cx->last_transfer_error = 0;
/* Notify that transfer has started */
DebugPinHigh(DEBUG_PIN_BUSY);
i2cx->transfer_state.BUSY = 1;
/* Send start condition */
@ -386,6 +405,8 @@ static void EV_IRQHandler(I2CRecTypeDef *i2cx)
{
uint8_t b;
DebugPinHigh(DEBUG_PIN_ISR);
/* Read SR1 and SR2 at the beginning (if not done so, flags may get lost) */
uint32_t event = I2C_GetLastEvent(i2cx->base);
@ -409,9 +430,11 @@ static void EV_IRQHandler(I2CRecTypeDef *i2cx)
/* Last byte received, disable interrupts and return. */
if(i2cx->transfer_state.STOP_REQUESTED) {
/* Transfer finished */
DebugPinLow(DEBUG_PIN_BUSY);
i2cx->transfer_state.BUSY = 0;
/* Disable all interrupts */
I2C_ITConfig(i2cx->base, I2C_IT_EVT | I2C_IT_BUF | I2C_IT_ERR, DISABLE);
DebugPinLow(DEBUG_PIN_ISR);
return;
}
@ -423,7 +446,7 @@ static void EV_IRQHandler(I2CRecTypeDef *i2cx)
I2C_GenerateSTOP(i2cx->base, ENABLE);
i2cx->transfer_state.STOP_REQUESTED = 1;
}
DebugPinLow(DEBUG_PIN_ISR);
return;
}
@ -439,7 +462,7 @@ static void EV_IRQHandler(I2CRecTypeDef *i2cx)
I2C_GenerateSTOP(i2cx->base, ENABLE);
i2cx->transfer_state.STOP_REQUESTED = 1;
}
DebugPinLow(DEBUG_PIN_ISR);
return;
}
@ -451,22 +474,28 @@ static void EV_IRQHandler(I2CRecTypeDef *i2cx)
/* Last byte already sent, disable interrupts and return. */
if(i2cx->transfer_state.STOP_REQUESTED) {
/* Transfer finished */
DebugPinLow(DEBUG_PIN_BUSY);
i2cx->transfer_state.BUSY = 0;
/* Disable all interrupts */
I2C_ITConfig(i2cx->base, I2C_IT_EVT | I2C_IT_BUF | I2C_IT_ERR, DISABLE);
DebugPinLow(DEBUG_PIN_ISR);
return;
}
if(i2cx->buffer_ix < i2cx->buffer_len) {
/* Checking tx_buffer_ptr for NULL is a failsafe measure. */
I2C_SendData(i2cx->base, (i2cx->tx_buffer_ptr == NULL) ? 0 : i2cx->tx_buffer_ptr[i2cx->buffer_ix++]);
DebugPinLow(DEBUG_PIN_ISR);
return;
}
/* Peripheral is transfering last byte, request stop condition / */
/* On write-without-stop transfer-type, request start condition instead */
if(!i2cx->transfer_state.WRITE_WITHOUT_STOP) {
DebugPinHigh(2);
I2C_GenerateSTOP(i2cx->base, ENABLE);
i2cx->transfer_state.STOP_REQUESTED = 1;
DebugPinLow(2);
} else {
I2C_GenerateSTART(i2cx->base, ENABLE);
i2cx->transfer_state.STOP_REQUESTED = 1;
@ -475,6 +504,7 @@ static void EV_IRQHandler(I2CRecTypeDef *i2cx)
if(i2cx->buffer_len == 0) {
/* Transfer finished */
i2cx->transfer_state.BUSY = 0;
DebugPinLow(DEBUG_PIN_BUSY);
/* Disable all interrupts */
I2C_ITConfig(i2cx->base, I2C_IT_EVT | I2C_IT_BUF | I2C_IT_ERR, DISABLE);
} else {
@ -483,7 +513,7 @@ static void EV_IRQHandler(I2CRecTypeDef *i2cx)
/* If this is not done, BUSY will be cleared before the transfer is finished */
I2C_ITConfig(i2cx->base, I2C_IT_BUF, DISABLE);
}
DebugPinLow(DEBUG_PIN_ISR);
return;
}
@ -494,8 +524,10 @@ static void EV_IRQHandler(I2CRecTypeDef *i2cx)
if(i2cx->transfer_state.STOP_REQUESTED) {
/* Transfer finished */
i2cx->transfer_state.BUSY = 0;
DebugPinLow(DEBUG_PIN_BUSY);
/* Disable all interrupts */
I2C_ITConfig(i2cx->base, I2C_IT_EVT | I2C_IT_BUF | I2C_IT_ERR, DISABLE);
DebugPinLow(DEBUG_PIN_ISR);
return;
}
@ -504,6 +536,7 @@ static void EV_IRQHandler(I2CRecTypeDef *i2cx)
(i2cx->i2c_address & 1)
? I2C_Direction_Receiver
: I2C_Direction_Transmitter);
DebugPinLow(DEBUG_PIN_ISR);
return;
}
@ -516,11 +549,14 @@ static void EV_IRQHandler(I2CRecTypeDef *i2cx)
PIOS_I2C_UnexpectedEvent = event;
i2cx->transfer_error = I2C_ERROR_UNEXPECTED_EVENT;
i2cx->transfer_state.BUSY = 0;
DebugPinLow(DEBUG_PIN_BUSY);
/* Do dummy read to send NAK + STOP condition */
I2C_AcknowledgeConfig(i2cx->base, DISABLE);
b = I2C_ReceiveData(i2cx->base);
I2C_GenerateSTOP(i2cx->base, ENABLE);
DebugPinLow(DEBUG_PIN_ISR);
}
@ -561,6 +597,7 @@ static void ER_IRQHandler(I2CRecTypeDef *i2cx)
/* Notify that transfer has finished (due to the error) */
i2cx->transfer_state.BUSY = 0;
DebugPinLow(DEBUG_PIN_BUSY);
}