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author | marcoveeneman <marco-veeneman@hotmail.com> | 2014-10-13 23:01:10 +0200 |
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committer | marcoveeneman <marco-veeneman@hotmail.com> | 2014-10-13 23:01:10 +0200 |
commit | b74008c8490fbd6f27392c0badd3de5b6792fc09 (patch) | |
tree | 48ae35cc8b12b478edabb854bba972ce87961b98 /os/hal/ports/TIVA/LLD/i2c_lld.c | |
parent | ed9baddee35122aa2654f3178148fee0d65b9547 (diff) | |
download | ChibiOS-Contrib-b74008c8490fbd6f27392c0badd3de5b6792fc09.tar.gz ChibiOS-Contrib-b74008c8490fbd6f27392c0badd3de5b6792fc09.tar.bz2 ChibiOS-Contrib-b74008c8490fbd6f27392c0badd3de5b6792fc09.zip |
Added Tiva HAL files.
Diffstat (limited to 'os/hal/ports/TIVA/LLD/i2c_lld.c')
-rw-r--r-- | os/hal/ports/TIVA/LLD/i2c_lld.c | 854 |
1 files changed, 854 insertions, 0 deletions
diff --git a/os/hal/ports/TIVA/LLD/i2c_lld.c b/os/hal/ports/TIVA/LLD/i2c_lld.c new file mode 100644 index 0000000..4019a3b --- /dev/null +++ b/os/hal/ports/TIVA/LLD/i2c_lld.c @@ -0,0 +1,854 @@ +/* + Copyright (C) 2014 Marco Veeneman + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. +*/ + +/** + * @file TIVA/LLD/i2c_lld.c + * @brief TM4C123x/TM4C129x I2C subsystem low level driver source. + * + * @addtogroup I2C + * @{ + */ + +#include "hal.h" + +#if HAL_USE_I2C || defined(__DOXYGEN__) + +/*===========================================================================*/ +/* Driver local definitions. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Driver constants. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Driver exported variables. */ +/*===========================================================================*/ + +/** + * @brief I2C0 driver identifier. + */ +#if TIVA_I2C_USE_I2C0 || defined(__DOXYGEN__) +I2CDriver I2CD1; +#endif + +/** + * @brief I2C1 driver identifier. + */ +#if TIVA_I2C_USE_I2C1 || defined(__DOXYGEN__) +I2CDriver I2CD2; +#endif + +/** + * @brief I2C2 driver identifier. + */ +#if TIVA_I2C_USE_I2C2 || defined(__DOXYGEN__) +I2CDriver I2CD3; +#endif + +/** + * @brief I2C3 driver identifier. + */ +#if TIVA_I2C_USE_I2C3 || defined(__DOXYGEN__) +I2CDriver I2CD4; +#endif + +/** + * @brief I2C4 driver identifier. + */ +#if TIVA_I2C_USE_I2C4 || defined(__DOXYGEN__) +I2CDriver I2CD5; +#endif + +/** + * @brief I2C5 driver identifier. + */ +#if TIVA_I2C_USE_I2C5 || defined(__DOXYGEN__) +I2CDriver I2CD6; +#endif + +/** + * @brief I2C6 driver identifier. + */ +#if TIVA_I2C_USE_I2C6 || defined(__DOXYGEN__) +I2CDriver I2CD7; +#endif + +/** + * @brief I2C7 driver identifier. + */ +#if TIVA_I2C_USE_I2C7 || defined(__DOXYGEN__) +I2CDriver I2CD8; +#endif + +/** + * @brief I2C8 driver identifier. + */ +#if TIVA_I2C_USE_I2C8 || defined(__DOXYGEN__) +I2CDriver I2CD9; +#endif + +/** + * @brief I2C9 driver identifier. + */ +#if TIVA_I2C_USE_I2C9 || defined(__DOXYGEN__) +I2CDriver I2CD10; +#endif + +/*===========================================================================*/ +/* Driver local variables and types. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Driver local functions. */ +/*===========================================================================*/ + +/** + * @brief I2C shared ISR code. + * + * @param[in] i2cp pointer to the @p I2CDriver object + * + * @notapi + */ +static void i2c_lld_serve_interrupt(I2CDriver *i2cp) +{ + I2C_TypeDef *dp = i2cp->i2c; + uint32_t status; + + // clear MIS bit in MICR by writing 1 + dp->MICR = 1; + + // read interrupt status + status = dp->MCS; + + if (status & TIVA_MCS_ERROR) { + i2cp->errors |= I2C_BUS_ERROR; + } + if (status & TIVA_MCS_ARBLST) { + i2cp->errors |= I2C_ARBITRATION_LOST; + } + + if (i2cp->errors == I2C_NO_ERROR) { + // no error detected + switch(i2cp->intstate) { + case STATE_IDLE: { + _i2c_wakeup_isr(i2cp); + break; + } + case STATE_WRITE_NEXT: { + if (i2cp->txbytes == 1) { + i2cp->intstate = STATE_WRITE_FINAL; + } + dp->MDR = *(i2cp->txbuf); + i2cp->txbuf++; + i2cp->txbytes--; + // start transmission + dp->MCS = TIVA_I2C_BURST_SEND_CONTINUE; + break; + } + case STATE_WRITE_FINAL: { + if (i2cp->rxbytes == 0) { + i2cp->intstate = STATE_IDLE; + } + else if (i2cp->rxbytes == 1) { + i2cp->intstate = STATE_READ_ONE; + } + else { + i2cp->intstate = STATE_READ_FIRST; + } + dp->MDR = *(i2cp->txbuf); + i2cp->txbuf++; + // txbytes - 1 + i2cp->txbytes--; + // start transmission + dp->MCS = TIVA_I2C_BURST_SEND_FINISH; + break; + } + case STATE_WAIT_ACK: { + break; + } + case STATE_SEND_ACK: { + break; + } + case STATE_READ_ONE: { + i2cp->intstate = STATE_READ_WAIT; + // Initializes driver fields, LSB = 1 -> read. + i2cp->addr |= 1; + + // set slave address + dp->MSA = i2cp->addr; + i2cp->rxbytes--; + //start receiving + dp->MCS = TIVA_I2C_SINGLE_RECEIVE; + + break; + } + case STATE_READ_FIRST: { + if (i2cp->rxbytes == 2) { + i2cp->intstate = STATE_READ_FINAL; + } + else { + i2cp->intstate = STATE_READ_NEXT; + } + + // Initializes driver fields, LSB = 1 -> read. + i2cp->addr |= 1; + + // set slave address + dp->MSA = i2cp->addr; + i2cp->rxbytes--; + //start receiving + dp->MCS = TIVA_I2C_BURST_RECEIVE_START; + + break; + } + case STATE_READ_NEXT: { + if(i2cp->rxbytes == 0) { + i2cp->intstate = STATE_READ_FINAL; + } + *(i2cp->rxbuf) = dp->MDR; + i2cp->rxbuf++; + i2cp->rxbytes--; + //start receiving + dp->MCS = TIVA_I2C_BURST_RECEIVE_CONTINUE; + + break; + } + case STATE_READ_FINAL: { + i2cp->intstate = STATE_READ_WAIT; + *(i2cp->rxbuf) = dp->MDR; + i2cp->rxbuf++; + i2cp->rxbytes--; + //start receiving + dp->MCS = TIVA_I2C_BURST_RECEIVE_FINISH; + + break; + } + case STATE_READ_WAIT: { + i2cp->intstate = STATE_IDLE; + *(i2cp->rxbuf) = dp->MDR; + i2cp->rxbuf++; + _i2c_wakeup_isr(i2cp); + break; + } + } + } + else { + // error detected + _i2c_wakeup_error_isr(i2cp); + } +} + +/*===========================================================================*/ +/* Driver interrupt handlers. */ +/*===========================================================================*/ + +#if TIVA_I2C_USE_I2C0 || defined(__DOXYGEN__) +/** + * @brief I2C0 interrupt handler. + * + * @notapi + */ +OSAL_IRQ_HANDLER(TIVA_I2C0_HANDLER) +{ + OSAL_IRQ_PROLOGUE(); + + i2c_lld_serve_interrupt(&I2CD1); + + OSAL_IRQ_EPILOGUE(); +} +#endif /* TIVA_I2C_USE_I2C0 */ + +#if TIVA_I2C_USE_I2C1 || defined(__DOXYGEN__) +/** + * @brief I2C1 interrupt handler. + * + * @notapi + */ +OSAL_IRQ_HANDLER(TIVA_I2C1_HANDLER) +{ + OSAL_IRQ_PROLOGUE(); + + i2c_lld_serve_interrupt(&I2CD2); + + OSAL_IRQ_EPILOGUE(); +} +#endif /* TIVA_I2C_USE_I2C1 */ + +#if TIVA_I2C_USE_I2C2 || defined(__DOXYGEN__) +/** + * @brief I2C2 interrupt handler. + * + * @notapi + */ +OSAL_IRQ_HANDLER(TIVA_I2C2_HANDLER) +{ + OSAL_IRQ_PROLOGUE(); + + i2c_lld_serve_interrupt(&I2CD3); + + OSAL_IRQ_EPILOGUE(); +} +#endif /* TIVA_I2C_USE_I2C2 */ + +#if TIVA_I2C_USE_I2C3 || defined(__DOXYGEN__) +/** + * @brief I2C3 interrupt handler. + * + * @notapi + */ +OSAL_IRQ_HANDLER(TIVA_I2C3_HANDLER) +{ + OSAL_IRQ_PROLOGUE(); + + i2c_lld_serve_interrupt(&I2CD4); + + OSAL_IRQ_EPILOGUE(); +} +#endif /* TIVA_I2C_USE_I2C3 */ + +#if TIVA_I2C_USE_I2C4 || defined(__DOXYGEN__) +/** + * @brief I2C4 interrupt handler. + * + * @notapi + */ +OSAL_IRQ_HANDLER(TIVA_I2C4_HANDLER) +{ + OSAL_IRQ_PROLOGUE(); + + i2c_lld_serve_interrupt(&I2CD5); + + OSAL_IRQ_EPILOGUE(); +} +#endif /* TIVA_I2C_USE_I2C4 */ + +#if TIVA_I2C_USE_I2C5 || defined(__DOXYGEN__) +/** + * @brief I2C5 interrupt handler. + * + * @notapi + */ +OSAL_IRQ_HANDLER(TIVA_I2C5_HANDLER) +{ + OSAL_IRQ_PROLOGUE(); + + i2c_lld_serve_interrupt(&I2CD6); + + OSAL_IRQ_EPILOGUE(); +} +#endif /* TIVA_I2C_USE_I2C5 */ + +#if TIVA_I2C_USE_I2C6 || defined(__DOXYGEN__) +/** + * @brief I2C6 interrupt handler. + * + * @notapi + */ +OSAL_IRQ_HANDLER(TIVA_I2C6_HANDLER) +{ + OSAL_IRQ_PROLOGUE(); + + i2c_lld_serve_interrupt(&I2CD7); + + OSAL_IRQ_EPILOGUE(); +} +#endif /* TIVA_I2C_USE_I2C6 */ + +#if TIVA_I2C_USE_I2C7 || defined(__DOXYGEN__) +/** + * @brief I2C7 interrupt handler. + * + * @notapi + */ +OSAL_IRQ_HANDLER(TIVA_I2C7_HANDLER) +{ + OSAL_IRQ_PROLOGUE(); + + i2c_lld_serve_interrupt(&I2CD8); + + OSAL_IRQ_EPILOGUE(); +} +#endif /* TIVA_I2C_USE_I2C7 */ + +#if TIVA_I2C_USE_I2C8 || defined(__DOXYGEN__) +/** + * @brief I2C8 interrupt handler. + * + * @notapi + */ +OSAL_IRQ_HANDLER(TIVA_I2C8_HANDLER) +{ + OSAL_IRQ_PROLOGUE(); + + i2c_lld_serve_interrupt(&I2CD9); + + OSAL_IRQ_EPILOGUE(); +} +#endif /* TIVA_I2C_USE_I2C8 */ + +#if TIVA_I2C_USE_I2C9 || defined(__DOXYGEN__) +/** + * @brief I2C9 interrupt handler. + * + * @notapi + */ +OSAL_IRQ_HANDLER(TIVA_I2C9_HANDLER) +{ + OSAL_IRQ_PROLOGUE(); + + i2c_lld_serve_interrupt(&I2CD10); + + OSAL_IRQ_EPILOGUE(); +} +#endif /* TIVA_I2C_USE_I2C9 */ + +/*===========================================================================*/ +/* Driver exported functions. */ +/*===========================================================================*/ + +/** + * @brief Low level I2C driver initialization. + * + * @notapi + */ +void i2c_lld_init(void) { + +#if TIVA_I2C_USE_I2C0 + i2cObjectInit(&I2CD1); + I2CD1.thread = NULL; + I2CD1.i2c = I2C0; +#endif /* TIVA_I2C_USE_I2C0 */ + +#if TIVA_I2C_USE_I2C1 + i2cObjectInit(&I2CD2); + I2CD2.thread = NULL; + I2CD2.i2c = I2C1; +#endif /* TIVA_I2C_USE_I2C1 */ + +#if TIVA_I2C_USE_I2C2 + i2cObjectInit(&I2CD3); + I2CD3.thread = NULL; + I2CD3.i2c = I2C2; +#endif /* TIVA_I2C_USE_I2C2 */ + +#if TIVA_I2C_USE_I2C3 + i2cObjectInit(&I2CD4); + I2CD4.thread = NULL; + I2CD4.i2c = I2C3; +#endif /* TIVA_I2C_USE_I2C3 */ + +#if TIVA_I2C_USE_I2C4 + i2cObjectInit(&I2CD5); + I2CD5.thread = NULL; + I2CD5.i2c = I2C4; +#endif /* TIVA_I2C_USE_I2C4 */ + +#if TIVA_I2C_USE_I2C5 + i2cObjectInit(&I2CD6); + I2CD6.thread = NULL; + I2CD6.i2c = I2C5; +#endif /* TIVA_I2C_USE_I2C5 */ + +#if TIVA_I2C_USE_I2C6 + i2cObjectInit(&I2CD7); + I2CD7.thread = NULL; + I2CD7.i2c = I2C6; +#endif /* TIVA_I2C_USE_I2C6 */ + +#if TIVA_I2C_USE_I2C7 + i2cObjectInit(&I2CD8); + I2CD8.thread = NULL; + I2CD8.i2c = I2C7; +#endif /* TIVA_I2C_USE_I2C7 */ + +#if TIVA_I2C_USE_I2C8 + i2cObjectInit(&I2CD9); + I2CD9.thread = NULL; + I2CD9.i2c = I2C8; +#endif /* TIVA_I2C_USE_I2C8 */ + +#if TIVA_I2C_USE_I2C9 + i2cObjectInit(&I2CD10); + I2CD10.thread = NULL; + I2CD10.i2c = I2C9; +#endif /* TIVA_I2C_USE_I2C9 */ +} + +/** + * @brief Configures and activates the I2C peripheral. + * + * @param[in] i2cp pointer to the @p I2CDriver object + * + * @notapi + */ +void i2c_lld_start(I2CDriver *i2cp) +{ + I2C_TypeDef *dp = i2cp->i2c; + + /* If in stopped state then enables the I2C clocks.*/ + if (i2cp->state == I2C_STOP) { +#if TIVA_I2C_USE_I2C0 + if (&I2CD1 == i2cp) { + SYSCTL->RCGCI2C |= (1 << 0); + nvicEnableVector(TIVA_I2C0_NUMBER, TIVA_I2C_I2C0_IRQ_PRIORITY); + } +#endif /* TIVA_I2C_USE_I2C0 */ + +#if TIVA_I2C_USE_I2C1 + if (&I2CD2 == i2cp) { + SYSCTL->RCGCI2C |= (1 << 1); + nvicEnableVector(TIVA_I2C1_NUMBER, TIVA_I2C_I2C1_IRQ_PRIORITY); + } +#endif /* TIVA_I2C_USE_I2C1 */ + +#if TIVA_I2C_USE_I2C2 + if (&I2CD3 == i2cp) { + SYSCTL->RCGCI2C |= (1 << 2); + nvicEnableVector(TIVA_I2C2_NUMBER, TIVA_I2C_I2C2_IRQ_PRIORITY); + } +#endif /* TIVA_I2C_USE_I2C2 */ + +#if TIVA_I2C_USE_I2C3 + if (&I2CD4 == i2cp) { + SYSCTL->RCGCI2C |= (1 << 3); + nvicEnableVector(TIVA_I2C3_NUMBER, TIVA_I2C_I2C3_IRQ_PRIORITY); + } +#endif /* TIVA_I2C_USE_I2C3 */ + +#if TIVA_I2C_USE_I2C4 + if (&I2CD5 == i2cp) { + SYSCTL->RCGCI2C |= (1 << 4); + nvicEnableVector(TIVA_I2C4_NUMBER, TIVA_I2C_I2C4_IRQ_PRIORITY); + } +#endif /* TIVA_I2C_USE_I2C4 */ + +#if TIVA_I2C_USE_I2C5 + if (&I2CD6 == i2cp) { + SYSCTL->RCGCI2C |= (1 << 5); + nvicEnableVector(TIVA_I2C5_NUMBER, TIVA_I2C_I2C5_IRQ_PRIORITY); + } +#endif /* TIVA_I2C_USE_I2C5 */ + +#if TIVA_I2C_USE_I2C6 + if (&I2CD7 == i2cp) { + SYSCTL->RCGCI2C |= (1 << 6); + nvicEnableVector(TIVA_I2C6_NUMBER, TIVA_I2C_I2C6_IRQ_PRIORITY); + } +#endif /* TIVA_I2C_USE_I2C6 */ + +#if TIVA_I2C_USE_I2C7 + if (&I2CD8 == i2cp) { + SYSCTL->RCGCI2C |= (1 << 7); + nvicEnableVector(TIVA_I2C7_NUMBER, TIVA_I2C_I2C7_IRQ_PRIORITY); + } +#endif /* TIVA_I2C_USE_I2C7 */ + +#if TIVA_I2C_USE_I2C8 + if (&I2CD9 == i2cp) { + SYSCTL->RCGCI2C |= (1 << 8); + nvicEnableVector(TIVA_I2C8_NUMBER, TIVA_I2C_I2C8_IRQ_PRIORITY); + } +#endif /* TIVA_I2C_USE_I2C7 */ + +#if TIVA_I2C_USE_I2C9 + if (&I2CD10 == i2cp) { + SYSCTL->RCGCI2C |= (1 << 9); + nvicEnableVector(TIVA_I2C9_NUMBER, TIVA_I2C_I2C9_IRQ_PRIORITY); + } +#endif /* TIVA_I2C_USE_I2C7 */ + } + + dp->MCR = 0x10; + dp->MTPR = MTPR_VALUE; +} + +/** + * @brief Deactivates the I2C peripheral. + * + * @param[in] i2cp pointer to the @p I2CDriver object + * + * @notapi + */ +void i2c_lld_stop(I2CDriver *i2cp) +{ + I2C_TypeDef *dp = i2cp->i2c; + /* If not in stopped state then disables the I2C clock.*/ + if (i2cp->state != I2C_STOP) { + + /* I2C disable.*/ + // TODO: abort i2c operation + //i2c_lld_abort_operation(i2cp); + +#if TIVA_I2C_USE_I2C0 + if (&I2CD1 == i2cp) { + SYSCTL->RCGCI2C &= ~(1 << 0); + nvicDisableVector(TIVA_I2C0_NUMBER); + } +#endif /* TIVA_I2C_USE_I2C0 */ + +#if TIVA_I2C_USE_I2C1 + if (&I2CD2 == i2cp) { + SYSCTL->RCGCI2C &= ~(1 << 1); + nvicDisableVector(TIVA_I2C1_NUMBER); + } +#endif /* TIVA_I2C_USE_I2C1 */ + +#if TIVA_I2C_USE_I2C2 + if (&I2CD3 == i2cp) { + SYSCTL->RCGCI2C &= ~(1 << 2); + nvicDisableVector(TIVA_I2C2_NUMBER); + } +#endif /* TIVA_I2C_USE_I2C2 */ + +#if TIVA_I2C_USE_I2C3 + if (&I2CD4 == i2cp) { + SYSCTL->RCGCI2C &= ~(1 << 3); + nvicDisableVector(TIVA_I2C3_NUMBER); + } +#endif /* TIVA_I2C_USE_I2C3 */ + +#if TIVA_I2C_USE_I2C4 + if (&I2CD5 == i2cp) { + SYSCTL->RCGCI2C &= ~(1 << 4); + nvicDisableVector(TIVA_I2C4_NUMBER); + } +#endif /* TIVA_I2C_USE_I2C4 */ + +#if TIVA_I2C_USE_I2C5 + if (&I2CD6 == i2cp) { + SYSCTL->RCGCI2C &= ~(1 << 5); + nvicDisableVector(TIVA_I2C5_NUMBER); + } +#endif /* TIVA_I2C_USE_I2C5 */ + +#if TIVA_I2C_USE_I2C6 + if (&I2CD7 == i2cp) { + SYSCTL->RCGCI2C &= ~(1 << 6); + nvicDisableVector(TIVA_I2C6_NUMBER); + } +#endif /* TIVA_I2C_USE_I2C6 */ + +#if TIVA_I2C_USE_I2C7 + if (&I2CD8 == i2cp) { + SYSCTL->RCGCI2C &= ~(1 << 7); + nvicDisableVector(TIVA_I2C7_NUMBER); + } +#endif /* TIVA_I2C_USE_I2C7 */ + +#if TIVA_I2C_USE_I2C8 + if (&I2CD9 == i2cp) { + SYSCTL->RCGCI2C &= ~(1 << 8); + nvicDisableVector(TIVA_I2C8_NUMBER); + } +#endif /* TIVA_I2C_USE_I2C8 */ + +#if TIVA_I2C_USE_I2C9 + if (&I2CD10 == i2cp) { + SYSCTL->RCGCI2C &= ~(1 << 9); + nvicDisableVector(TIVA_I2C9_NUMBER); + } +#endif /* TIVA_I2C_USE_I2C9 */ + + dp->MCR = 0; + dp->MTPR = 0; + } +} + +/** + * @brief Receives data via the I2C bus as master. + * + * @param[in] i2cp pointer to the @p I2CDriver object + * @param[in] addr slave device address + * @param[out] rxbuf pointer to the receive buffer + * @param[in] rxbytes number of bytes to be received + * @param[in] timeout the number of ticks before the operation timeouts, + * the following special values are allowed: + * - @a TIME_INFINITE no timeout. + * . + * @return The operation status. + * @retval RDY_OK if the function succeeded. + * @retval RDY_RESET if one or more I2C errors occurred, the errors can + * be retrieved using @p i2cGetErrors(). + * @retval RDY_TIMEOUT if a timeout occurred before operation end. <b>After a + * timeout the driver must be stopped and restarted + * because the bus is in an uncertain state</b>. + * + * @notapi + */ +msg_t i2c_lld_master_receive_timeout(I2CDriver *i2cp, i2caddr_t addr, + uint8_t *rxbuf, size_t rxbytes, + systime_t timeout) +{ + I2C_TypeDef *dp = i2cp->i2c; + systime_t start, end; + + i2cp->rxbuf = rxbuf; + i2cp->rxbytes = rxbytes; + + /* Resetting error flags for this transfer.*/ + i2cp->errors = I2C_NO_ERROR; + + /* Initializes driver fields, LSB = 1 -> receive.*/ + i2cp->addr = (addr << 1) | 0x01; + + /* Releases the lock from high level driver.*/ + osalSysUnlock(); + + /* Calculating the time window for the timeout on the busy bus condition.*/ + start = osalOsGetSystemTimeX(); + end = start + OSAL_MS2ST(TIVA_I2C_BUSY_TIMEOUT); + + /* Waits until BUSY flag is reset or, alternatively, for a timeout + condition.*/ + while (true) { + osalSysLock(); + + /* If the bus is not busy then the operation can continue, note, the + loop is exited in the locked state.*/ + if ((dp->MCS & TIVA_MCS_BUSY) == 0) + break; + + /* If the system time went outside the allowed window then a timeout + condition is returned.*/ + if (!osalOsIsTimeWithinX(osalOsGetSystemTimeX(), start, end)) + return MSG_TIMEOUT; + + osalSysUnlock(); + } + + /* set slave address */ + dp->MSA = addr; + + /* Starts the operation.*/ + dp->MCS = TIVA_I2C_SINGLE_RECEIVE; + + /* Waits for the operation completion or a timeout.*/ + return osalThreadSuspendTimeoutS(&i2cp->thread, timeout); +} + +/** + * @brief Transmits data via the I2C bus as master. + * + * @param[in] i2cp pointer to the @p I2CDriver object + * @param[in] addr slave device address + * @param[in] txbuf pointer to the transmit buffer + * @param[in] txbytes number of bytes to be transmitted + * @param[out] rxbuf pointer to the receive buffer + * @param[in] rxbytes number of bytes to be received + * @param[in] timeout the number of ticks before the operation timeouts, + * the following special values are allowed: + * - @a TIME_INFINITE no timeout. + * . + * @return The operation status. + * @retval RDY_OK if the function succeeded. + * @retval RDY_RESET if one or more I2C errors occurred, the errors can + * be retrieved using @p i2cGetErrors(). + * @retval RDY_TIMEOUT if a timeout occurred before operation end. <b>After a + * timeout the driver must be stopped and restarted + * because the bus is in an uncertain state</b>. + * + * @notapi + */ +msg_t i2c_lld_master_transmit_timeout(I2CDriver *i2cp, i2caddr_t addr, + const uint8_t *txbuf, size_t txbytes, + uint8_t *rxbuf, size_t rxbytes, + systime_t timeout) +{ + I2C_TypeDef *dp = i2cp->i2c; + systime_t start, end; + + i2cp->rxbuf = rxbuf; + i2cp->rxbytes = rxbytes; + i2cp->txbuf = txbuf; + i2cp->txbytes = txbytes; + + /* Resetting error flags for this transfer.*/ + i2cp->errors = I2C_NO_ERROR; + + /* Releases the lock from high level driver.*/ + osalSysUnlock(); + + /* Calculating the time window for the timeout on the busy bus condition.*/ + start = osalOsGetSystemTimeX(); + end = start + OSAL_MS2ST(TIVA_I2C_BUSY_TIMEOUT); + + /* Waits until BUSY flag is reset or, alternatively, for a timeout + condition.*/ + while (true) { + osalSysLock(); + + /* If the bus is not busy then the operation can continue, note, the + loop is exited in the locked state.*/ + if ((dp->MCS & TIVA_MCS_BUSY) == 0) + break; + + /* If the system time went outside the allowed window then a timeout + condition is returned.*/ + if (!osalOsIsTimeWithinX(osalOsGetSystemTimeX(), start, end)) + return MSG_TIMEOUT; + + osalSysUnlock(); + } + + /* Initializes driver fields, LSB = 0 -> write.*/ + i2cp->addr = addr << 1 | 0; + + /* set slave address */ + dp->MSA = i2cp->addr; + + /* enable interrupts */ + dp->MIMR = TIVA_MIMR_IM; + + /* put data in register */ + dp->MDR = *(i2cp->txbuf); + + /* check if 1 or more bytes */ + if (i2cp->txbytes == 1) { + if (i2cp->rxbytes == 1) { + // one byte read + i2cp->intstate = STATE_READ_ONE; + } + else { + // multiple byte read + i2cp->intstate = STATE_READ_FIRST; + } + // single byte send + dp->MCS = TIVA_I2C_SIGNLE_SEND; + } + else { + if (i2cp->txbytes == 2) { + // 2 bytes + i2cp->intstate = STATE_WRITE_FINAL; + } + else { + // more then 2 bytes + i2cp->intstate = STATE_WRITE_NEXT; + } + // multiple bytes start send + dp->MCS = TIVA_I2C_BURST_SEND_START; + } + + i2cp->txbuf++; + i2cp->txbytes--; + + /* Waits for the operation completion or a timeout.*/ + return osalThreadSuspendTimeoutS(&i2cp->thread, timeout); +} + +#endif /* HAL_USE_I2C */ + +/** @} */ |