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ChibiOS
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I2C. Fix problem with write only transactions. Code cleanups. 

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@3747 35acf78f-673a-0410-8e92-d51de3d6d3f4
This commit is contained in:
barthess 2012-01-06 11:49:21 +00:00
parent c56e9ea70a
commit 8fbd1c95e0
1 changed files with 13 additions and 4 deletions
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17
os/hal/platforms/STM32/i2c_lld.c
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@ -304,14 +304,15 @@ static uint32_t i2c_get_event(I2CDriver *i2cp) {
* @notapi
*/
static void i2c_lld_serve_event_interrupt(I2CDriver *i2cp) {
I2C_TypeDef *dp = i2cp->i2c;
switch (i2c_get_event(i2cp)) {
case I2C_EV5_MASTER_MODE_SELECT:
dp->DR = i2cp->addr;
i2cp->i2c->DR = i2cp->addr;
break;
case I2C_EV6_MASTER_REC_MODE_SELECTED:
dmaStreamEnable(i2cp->dmarx);
/* LAST bit needs only during receive phase. */
i2cp->i2c->CR2 |= I2C_CR2_LAST;
break;
case I2C_EV6_MASTER_TRA_MODE_SELECTED:
dmaStreamEnable(i2cp->dmatx);
@ -324,6 +325,7 @@ static void i2c_lld_serve_event_interrupt(I2CDriver *i2cp) {
i2cp->i2c->CR1 |= I2C_CR1_START | I2C_CR1_ACK;
return;
}
i2cp->i2c->CR2 &= ~I2C_CR2_ITEVTEN;
i2cp->i2c->CR1 |= I2C_CR1_STOP;
wakeup_isr(i2cp, RDY_OK);
break;
@ -352,6 +354,10 @@ static void i2c_lld_serve_rx_end_irq(I2CDriver *i2cp, uint32_t flags) {
#endif
dmaStreamDisable(i2cp->dmarx);
dmaStreamClearInterrupt(i2cp->dmarx);
i2cp->i2c->CR2 &= ~(I2C_CR2_LAST | I2C_CR2_ITEVTEN);
i2cp->i2c->CR1 &= ~I2C_CR1_ACK;
i2cp->i2c->CR1 |= I2C_CR1_STOP;
wakeup_isr(i2cp, RDY_OK);
}
@ -375,6 +381,7 @@ static void i2c_lld_serve_tx_end_irq(I2CDriver *i2cp, uint32_t flags) {
#endif
dmaStreamDisable(i2cp->dmatx);
dmaStreamClearInterrupt(i2cp->dmatx);
}
/**
@ -407,6 +414,7 @@ static void i2c_lld_serve_error_interrupt(I2CDriver *i2cp) {
}
if (i2cp->i2c->SR1 & I2C_SR1_AF) { /* Acknowledge fail. */
i2cp->i2c->SR1 &= ~I2C_SR1_AF;
i2cp->i2c->CR2 &= ~I2C_CR2_ITEVTEN;
i2cp->i2c->CR1 |= I2C_CR1_STOP; /* Setting stop bit. */
errors |= I2CD_ACK_FAILURE;
}
@ -668,8 +676,7 @@ void i2c_lld_start(I2CDriver *i2cp) {
/* Reset i2c peripheral.*/
i2cp->i2c->CR1 = I2C_CR1_SWRST;
i2cp->i2c->CR1 = 0;
i2cp->i2c->CR2 = I2C_CR2_ITERREN | I2C_CR2_ITEVTEN |
I2C_CR2_DMAEN | I2C_CR2_LAST;
i2cp->i2c->CR2 = I2C_CR2_ITERREN | I2C_CR2_DMAEN;
/* Setup I2C parameters.*/
i2c_lld_set_clock(i2cp);
@ -785,6 +792,7 @@ msg_t i2c_lld_master_receive_timeout(I2CDriver *i2cp, i2caddr_t addr,
return RDY_TIMEOUT;
/* Starts the operation.*/
i2cp->i2c->CR2 |= I2C_CR2_ITEVTEN;
i2cp->i2c->CR1 |= I2C_CR1_START | I2C_CR1_ACK;
/* Waits for the operation completion or a timeout.*/
@ -868,6 +876,7 @@ msg_t i2c_lld_master_transmit_timeout(I2CDriver *i2cp, i2caddr_t addr,
return RDY_TIMEOUT;
/* Starts the operation.*/
i2cp->i2c->CR2 |= I2C_CR2_ITEVTEN;
i2cp->i2c->CR1 |= I2C_CR1_START;
/* Waits for the operation completion or a timeout.*/