git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/i2c_dev@3117 35acf78f-673a-0410-8e92-d51de3d6d3f4
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@ -28,6 +28,8 @@ I2CDriver I2CD2;
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/*===========================================================================*/
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/* Driver local variables. */
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/*===========================================================================*/
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static volatile uint16_t regSR1 = 0;
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static volatile uint16_t regSR2 = 0;
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/*===========================================================================*/
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/* Driver local functions. */
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@ -35,8 +37,8 @@ I2CDriver I2CD2;
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static uint32_t i2c_get_event(I2CDriver *i2cp){
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uint32_t regSR1 = i2cp->id_i2c->SR1;
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uint32_t regSR2 = i2cp->id_i2c->SR2;
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regSR1 = i2cp->id_i2c->SR1;
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regSR2 = i2cp->id_i2c->SR2;
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/* return the last event value from I2C status registers */
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return (I2C_EV_MASK & (regSR1 | (regSR2 << 16)));
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}
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@ -46,6 +48,10 @@ static void i2c_serve_event_interrupt(I2CDriver *i2cp) {
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#define txBuffp (i2cp->txbuff_p)
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#define rxBuffp (i2cp->rxbuff_p)
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/* debug variables */
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uint16_t sr1 = 0;
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uint16_t sr2 = 0;
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I2C_TypeDef *dp = i2cp->id_i2c;
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switch(i2c_get_event(i2cp)) {
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@ -148,6 +154,8 @@ static void i2c_serve_event_interrupt(I2CDriver *i2cp) {
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i2cp->flags |= I2C_FLG_3BTR;
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break;
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case 0:
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dp->CR2 &= (uint16_t)~I2C_CR2_ITEVTEN;
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dp->CR2 &= (uint16_t)~I2C_CR2_ITBUFEN;
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/* Portable I2C ISR code defined in the high level driver, note, it is a macro.*/
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_i2c_isr_code(i2cp, i2cp->id_slave_config);
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break;
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@ -166,7 +174,7 @@ static void i2c_serve_event_interrupt(I2CDriver *i2cp) {
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dp->CR1 &= (uint16_t)~I2C_CR1_ACK;
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/* Read the DataN-2
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* This clear the RXE & BFT flags and launch the DataN r
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* eception in the shift register (ending the SCL stretch) */
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* exception in the shift register (ending the SCL stretch) */
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*rxBuffp = dp->DR;
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rxBuffp++;
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/* Program the STOP */
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@ -183,6 +191,8 @@ static void i2c_serve_event_interrupt(I2CDriver *i2cp) {
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case I2C_EV7_3_MASTER_REC_2BYTES_TO_PROCESS: /* only for case of two bytes to be received */
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/* DataN-1 and DataN are received */
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chSysLockFromIsr();
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dp->CR2 &= (uint16_t)~I2C_CR2_ITEVTEN;
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dp->CR2 &= (uint16_t)~I2C_CR2_ITBUFEN;
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/* Program the STOP */
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dp->CR1 |= I2C_CR1_STOP;
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/* Read the DataN-1*/
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@ -198,6 +208,11 @@ static void i2c_serve_event_interrupt(I2CDriver *i2cp) {
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break;
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}
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break;
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default:
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sr1 = regSR1;
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sr2 = regSR2;
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// chDbgAssert(FALSE, "i2c_serve_event_interrupt(), #1", "unhandled flags");
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break;
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}
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#undef rxBuffp
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#undef txBuffp
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@ -528,6 +543,7 @@ void i2c_lld_stop(I2CDriver *i2cp) {
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* Bits 10-14 unused.
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* @param[in] txbytes number of bytes to be transmited
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* @param[in] rxbytes number of bytes to be received
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* TODO: other parameters
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*
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*/
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void i2c_lld_master_transmit(I2CDriver *i2cp, uint16_t slave_addr,
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@ -555,6 +571,10 @@ void i2c_lld_master_transmit(I2CDriver *i2cp, uint16_t slave_addr,
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i2cp->flags = 0;
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i2cp->errors = 0;
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/* enable ERR, EVT & BUF ITs */
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i2cp->id_i2c->CR2 |= (I2C_CR2_ITERREN|I2C_CR2_ITEVTEN|I2C_CR2_ITBUFEN);
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i2cp->id_i2c->CR1 &= ~I2C_CR1_POS;
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i2cp->id_i2c->CR1 |= I2C_CR1_START; /* send start bit */
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//#if !I2C_USE_WAIT
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@ -573,9 +593,7 @@ void i2c_lld_master_transmit(I2CDriver *i2cp, uint16_t slave_addr,
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chDbgAssert(timeout < I2C_START_TIMEOUT,
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"i2c_lld_master_transmit(), #1", "time is out");
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/* enable ERR, EVT & BUF ITs */
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i2cp->id_i2c->CR2 |= (I2C_CR2_ITERREN|I2C_CR2_ITEVTEN|I2C_CR2_ITBUFEN);
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i2cp->id_i2c->CR1 &= ~I2C_CR1_POS;
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}
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@ -589,6 +607,7 @@ void i2c_lld_master_transmit(I2CDriver *i2cp, uint16_t slave_addr,
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* Bits 10-14 unused.
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* @param[in] txbytes number of bytes to be transmited
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* @param[in] rxbytes number of bytes to be received
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* TODO: other parameters
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*
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*/
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void i2c_lld_master_receive(I2CDriver *i2cp, uint16_t slave_addr,
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@ -614,6 +633,11 @@ void i2c_lld_master_receive(I2CDriver *i2cp, uint16_t slave_addr,
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i2cp->flags = I2C_FLG_MASTER_RECEIVER;
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i2cp->errors = 0;
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/* enable ERR, EVT & BUF ITs */
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i2cp->id_i2c->CR2 |= (I2C_CR2_ITERREN|I2C_CR2_ITEVTEN|I2C_CR2_ITBUFEN);
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i2cp->id_i2c->CR1 |= I2C_CR1_ACK; /* acknowledge returned */
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i2cp->id_i2c->CR1 &= ~I2C_CR1_POS;
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/* Only one byte to be received */
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if(i2cp->rxbytes == 1) {
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i2cp->flags |= I2C_FLG_1BTR;
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@ -641,15 +665,10 @@ void i2c_lld_master_receive(I2CDriver *i2cp, uint16_t slave_addr,
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/* is timeout overflows? */
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chDbgAssert(timeout < I2C_START_TIMEOUT,
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"i2c_lld_master_receive(), #1", "time is out");
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/* enable ERR, EVT & BUF ITs */
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i2cp->id_i2c->CR2 |= (I2C_CR2_ITERREN|I2C_CR2_ITEVTEN|I2C_CR2_ITBUFEN);
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i2cp->id_i2c->CR1 |= I2C_CR1_ACK; /* acknowledge returned */
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i2cp->id_i2c->CR1 &= ~I2C_CR1_POS;
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}
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/* TODO: doxy strings or remove this redundant function */
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void i2c_lld_master_transceive(I2CDriver *i2cp){
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i2cp->flags = I2C_FLG_MASTER_RECEIVER;
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@ -664,10 +683,15 @@ void i2c_lld_master_transceive(I2CDriver *i2cp){
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/* Only two bytes to be received */
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else if(i2cp->rxbytes == 2) {
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i2cp->flags |= I2C_FLG_2BTR;
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i2cp->id_i2c->CR1 |= I2C_CR1_POS; /* Acknowledge Position */
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i2cp->id_i2c->CR1 |= I2C_CR1_POS; /* Acknowledge Position */
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}
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i2cp->id_i2c->CR1 |= I2C_CR1_START; /* send start bit */
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/* enable ERR, EVT & BUF ITs */
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i2cp->id_i2c->CR2 |= (I2C_CR2_ITERREN|I2C_CR2_ITEVTEN|I2C_CR2_ITBUFEN);
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i2cp->id_i2c->CR1 |= I2C_CR1_ACK; /* acknowledge returned */
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i2cp->id_i2c->CR1 &= ~I2C_CR1_POS;
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i2cp->id_i2c->CR1 |= I2C_CR1_START; /* send start bit */
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//#if !I2C_USE_WAIT
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// /* Wait until the START condition is generated on the bus:
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@ -684,11 +708,6 @@ void i2c_lld_master_transceive(I2CDriver *i2cp){
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/* is timeout overflows? */
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chDbgAssert(timeout < I2C_START_TIMEOUT,
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"i2c_lld_master_receive(), #1", "time is out");
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/* enable ERR, EVT & BUF ITs */
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i2cp->id_i2c->CR2 |= (I2C_CR2_ITERREN|I2C_CR2_ITEVTEN|I2C_CR2_ITBUFEN);
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i2cp->id_i2c->CR1 |= I2C_CR1_ACK; /* acknowledge returned */
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i2cp->id_i2c->CR1 &= ~I2C_CR1_POS;
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}
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@ -198,7 +198,8 @@ struct I2CDriver{
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/* Wait until BUSY flag is reset: a STOP has been generated on the bus
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* signaling the end of transmission
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* signaling the end of transmission. Normally this wait function
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* does not block thread, only if slave not response it does.
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*/
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#define i2c_lld_wait_bus_free(i2cp) { \
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uint32_t tmo = 0xffff; \
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@ -165,18 +165,18 @@ void i2cMasterTransmit(I2CDriver *i2cp,
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/* init slave config field in driver */
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i2cp->id_slave_config = i2cscfg;
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#if I2C_USE_WAIT
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#if CH_DBG_ENABLE_ASSERTS
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i2c_lld_wait_bus_free(i2cp);
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if(i2c_lld_bus_is_busy(i2cp)) {
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if(i2c_lld_bus_is_busy(i2cp)) { /* Probably slave locks up and need reset. */
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#ifdef PRINTTRACE
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print("I2C Bus busy!\n");
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return;
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#else
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/* the time is out */
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/* the time is out. Probably slave locks up. */
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chDbgAssert(FALSE, "i2cMasterTransmit(), #1", "time is out");
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#endif
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#endif /* PRINTTRACE */
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};
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#endif
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#endif /* CH_DBG_ENABLE_ASSERTS */
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chSysLock();
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chDbgAssert(i2cp->id_state == I2C_READY,
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@ -214,18 +214,17 @@ void i2cMasterReceive(I2CDriver *i2cp,
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/* init slave config field in driver */
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i2cp->id_slave_config = i2cscfg;
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#if I2C_USE_WAIT
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#if CH_DBG_ENABLE_ASSERTS
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i2c_lld_wait_bus_free(i2cp);
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if(i2c_lld_bus_is_busy(i2cp)) {
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#ifdef PRINTTRACE
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print("I2C Bus busy!\n");
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return;
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#else
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/* the time is out */
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chDbgAssert(FALSE, "i2cMasterReceive(), #1", "time is out");
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#endif
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#endif /* PRINTTRACE */
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};
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#endif
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#endif /* CH_DBG_ENABLE_ASSERTS */
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chSysLock();
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chDbgAssert(i2cp->id_state == I2C_READY,
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