diff options
Diffstat (limited to 'os/hal/platforms/LPC11xx/i2c_lld.c')
| -rw-r--r-- | os/hal/platforms/LPC11xx/i2c_lld.c | 438 |
1 files changed, 0 insertions, 438 deletions
diff --git a/os/hal/platforms/LPC11xx/i2c_lld.c b/os/hal/platforms/LPC11xx/i2c_lld.c deleted file mode 100644 index c68f11460..000000000 --- a/os/hal/platforms/LPC11xx/i2c_lld.c +++ /dev/null @@ -1,438 +0,0 @@ -/*
- ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
- LPC11xx I2C driver - Copyright (C) 2013 Marcin Jokel
-
- 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.
-*/
-
-/*
- Concepts and parts of this file have been contributed by Uladzimir Pylinsky
- aka barthess.
- */
-
-
-/**
- * @file LPC11xx/i2c_lld.h
- * @brief LPC11xx I2C subsystem low level driver header.
- *
- * @addtogroup I2C
- * @{
- */
-
-#include "ch.h"
-#include "hal.h"
-
-#if HAL_USE_I2C || defined(__DOXYGEN__)
-
-/*===========================================================================*/
-/* Driver local definitions. */
-/*===========================================================================*/
-
-/*===========================================================================*/
-/* Driver constants. */
-/*===========================================================================*/
-
-/*===========================================================================*/
-/* Driver exported variables. */
-/*===========================================================================*/
-
-/** @brief I2C1 driver identifier.*/
-I2CDriver I2CD1;
-
-/*===========================================================================*/
-/* Driver local variables. */
-/*===========================================================================*/
-
-/*===========================================================================*/
-/* Driver local functions. */
-/*===========================================================================*/
-
-/**
- * @brief Wakes up the waiting thread.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- * @param[in] msg wakeup message
- *
- * @notapi
- */
-#define wakeup_isr(i2cp, msg) { \
- chSysLockFromIsr(); \
- if ((i2cp)->thread != NULL) { \
- Thread *tp = (i2cp)->thread; \
- (i2cp)->thread = NULL; \
- tp->p_u.rdymsg = (msg); \
- chSchReadyI(tp); \
- } \
- chSysUnlockFromIsr(); \
-}
-
-/**
- * @brief Handling of stalled I2C transactions.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- *
- * @notapi
- */
-static void i2c_lld_safety_timeout(void *p) {
- I2CDriver *i2cp = (I2CDriver *)p;
-
- chSysLockFromIsr();
- if (i2cp->thread) {
- Thread *tp = i2cp->thread;
- i2cp->thread = NULL;
- tp->p_u.rdymsg = RDY_TIMEOUT;
- chSchReadyI(tp);
- }
- chSysUnlockFromIsr();
-}
-
-/**
- * @brief I2C error handler.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- *
- * @notapi
- */
-static void i2c_lld_serve_error_interrupt(I2CDriver *i2cp, uint32_t status) {
- i2cflags_t error = 0;
-
- switch (status) {
- case I2C_STATE_ARB_LOST:
- error = I2CD_ARBITRATION_LOST;
- break;
- case I2C_STATE_BUS_ERROR:
- error = I2CD_BUS_ERROR;
- break;
- case I2C_STATE_MS_SLAR_NACK:
- case I2C_STATE_MS_TDAT_NACK:
- case I2C_STATE_MS_SLAW_NACK:
- error = I2CD_ACK_FAILURE ;
- break;
- }
-
- /* If some error has been identified then sends wakes the waiting thread.*/
- i2cp->errors = error;
- wakeup_isr(i2cp, RDY_RESET);
-}
-
-/*===========================================================================*/
-/* Driver interrupt handlers. */
-/*===========================================================================*/
-/**
- * @brief I2C event interrupt handler.
- *
- * @notapi
- */
-CH_IRQ_HANDLER(Vector7C) {
- uint32_t status;
-
- CH_IRQ_PROLOGUE();
- status = LPC_I2C->STAT;
- switch(status) {
- case I2C_STATE_MS_START: /* A START condition has been transmitted. */
- if (I2CD1.txbytes > 0) {
- LPC_I2C->DAT = I2CD1.addr; /* Write slave address with WR bit. */
- }
- else {
- LPC_I2C->DAT = I2CD1.addr | I2C_RD_BIT; /* Write slave address with RD bit. */
- }
-
- LPC_I2C->CONCLR = I2C_CONCLR_STAC | I2C_CONCLR_SIC; /* Clear START and SI bit. */
- break;
-
- case I2C_STATE_MS_SLAR_NACK: /* NOT ACK has been received, Master will be transmitted STOP. */
- case I2C_STATE_MS_TDAT_NACK: /* NOT ACK has been received, Master will be transmitted STOP. */
- case I2C_STATE_MS_SLAW_NACK: /* NOT ACK has been received, Master will be transmitted STOP. */
- LPC_I2C->CONSET = I2C_CONSET_STO; /* Set STOP bit. */
- LPC_I2C->CONCLR = I2C_CONCLR_SIC; /* Clear SI bit. */
- i2c_lld_serve_error_interrupt(&I2CD1, status);
- break;
-
- case I2C_STATE_MS_SLAW_ACK: /* SLA + W has been transmitted, ACK has been received. */
- case I2C_STATE_MS_TDAT_ACK: /* Data byte has been transmitted, ACK has been received. */
- if (I2CD1.txbytes > 0) {
- LPC_I2C->DAT = *I2CD1.txbuf++; /* Write data. */
- I2CD1.txbytes--;
- }
- else {
- if (I2CD1.rxbytes > 0) {
- LPC_I2C->CONSET = I2C_CONSET_STO | I2C_CONSET_STA; /* Set START and STOP bit. */
- } /* STOP bit will be transmit, then START bit. */
- else {
- LPC_I2C->CONSET = I2C_CONSET_STO; /* Set STOP bit. */
- wakeup_isr(&I2CD1, RDY_OK);
- }
- }
- LPC_I2C->CONCLR = I2C_CONCLR_SIC; /* Clear SI bit. */
- break;
-
- case I2C_STATE_MS_SLAR_ACK: /* SLA + R has been transmitted, ACK has been received. */
- case I2C_STATE_MS_RDAT_ACK: /* Data byte has been received, ACK has been returned. */
- if (status == I2C_STATE_MS_RDAT_ACK) {
- *I2CD1.rxbuf++ = LPC_I2C->DAT; /* Read data */
- I2CD1.rxbytes--;
- }
- if (I2CD1.rxbytes == 1) {
- LPC_I2C->CONCLR = I2C_CONCLR_SIC | I2C_CONCLR_AAC; /* Clear SI and ACK bit. */
- }
- else {
- LPC_I2C->CONSET = I2C_CONSET_AA; /* Set ACK bit. */
- LPC_I2C->CONCLR = I2C_CONCLR_SIC; /* Clear SI bit. */
- }
- break;
-
- case I2C_STATE_MS_RDAT_NACK: /* Data byte has been received, NOT ACK has been returned. */
- *I2CD1.rxbuf++ = LPC_I2C->DAT; /* Read data. */
- I2CD1.rxbytes--;
- LPC_I2C->CONSET = I2C_CONSET_STO; /* Set STOP bit. */
- LPC_I2C->CONCLR = I2C_CONCLR_SIC; /* Clear SI bit. */
- wakeup_isr(&I2CD1, RDY_OK);
- break;
-
- case I2C_STATE_BUS_ERROR: /* Bus error. */
- case I2C_STATE_ARB_LOST: /* Arbitration lost. */
- LPC_I2C->CONCLR = I2C_CONCLR_SIC; /* Clear SI bit. */
- i2c_lld_serve_error_interrupt(&I2CD1, status);
- break;
-
- }
-
- CH_IRQ_EPILOGUE();
-}
-
-/*===========================================================================*/
-/* Driver exported functions. */
-/*===========================================================================*/
-
-/**
- * @brief Low level I2C driver initialization.
- *
- * @notapi
- */
-void i2c_lld_init(void) {
-
- i2cObjectInit(&I2CD1);
- I2CD1.thread = NULL;
- I2CD1.i2c = LPC_I2C;
-
- LPC_IOCON->PIO0_4 = 0x01; /* Set I2C SCL pin function */
- LPC_IOCON->PIO0_5 = 0x01; /* Set I2C SDA pin function */
-}
-
-/**
- * @brief Configures and activates the I2C peripheral.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- *
- * @notapi
- */
-void i2c_lld_start(I2CDriver *i2cp) {
- uint32_t i2cscl;
- uint32_t mulh, mull, div;
- LPC_I2C_TypeDef *dp = i2cp->i2c;
-
- /* Make sure I2C peripheral is disabled */
- dp->CONCLR = I2C_CONCLR_ENC;
-
- /* If in stopped state then enables the I2C clock. */
- if (i2cp->state == I2C_STOP) {
-
- if (&I2CD1 == i2cp) {
- LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 5); /* Enable clock. */
- LPC_SYSCON->PRESETCTRL &= ~(1 << 1); /* Reset I2C peripheral.*/
- __NOP();
- LPC_SYSCON->PRESETCTRL |= (1 << 1);
- nvicEnableVector(I2C_IRQn,
- CORTEX_PRIORITY_MASK(LPC11xx_I2C_IRQ_PRIORITY));
- }
-
- }
-
- /* Setup I2C clock parameters.*/
- i2cscl = (LPC11xx_SYSCLK/(i2cp->config->clock_timing));
- if (i2cp->config->mode == I2C_FAST_MODE) {
- div = 19;
- mull = 13;
- mulh = 6;
- } else if (i2cp->config->mode == I2C_FAST_MODE_PLUS) {
- div = 3;
- mull = 2;
- mulh = 1;
- } else { /* i2cp->config->mode == I2C_STANDARD_MODE */
- div = 2;
- mull = 1;
- mulh = 1;
- }
-
- dp->SCLH = (mulh * i2cscl) / div;
- dp->SCLL = (mull * i2cscl) / div;
-
- /* Enable I2C.*/
- dp->CONSET |= I2C_CONSET_EN;
-}
-
-/**
- * @brief Deactivates the I2C peripheral.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- *
- * @notapi
- */
-void i2c_lld_stop(I2CDriver *i2cp) {
-
- /* If not in stopped state then disables the I2C clock.*/
- if (i2cp->state != I2C_STOP) {
-
- /* I2C disable.*/
- i2cp->i2c->CONCLR = I2C_CONCLR_ENC;
-
- if (&I2CD1 == i2cp) {
- nvicDisableVector(I2C_IRQn);
- LPC_SYSCON->SYSAHBCLKCTRL &= ~(1 << 5);
- }
- }
-}
-
-/**
- * @brief Receives data via the I2C bus as master.
- * @details Number of receiving bytes must be more than 1 on STM32F1x. This is
- * hardware restriction.
- *
- * @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) {
- LPC_I2C_TypeDef *dp = i2cp->i2c;
- VirtualTimer vt;
-
- i2cp->addr = addr << 1;
- /* Global timeout for the whole operation.*/
- if (timeout != TIME_INFINITE)
- chVTSetI(&vt, timeout, i2c_lld_safety_timeout, (void *)i2cp);
-
- /* Releases the lock from high level driver.*/
- chSysUnlock();
-
- /* Initializes driver fields */
- i2cp->errors = 0;
- i2cp->rxbuf = rxbuf;
- i2cp->rxbytes = rxbytes;
-
- /* This lock will be released in high level driver.*/
- chSysLock();
-
- /* Atomic check on the timer in order to make sure that a timeout didn't
- happen outside the critical zone.*/
- if ((timeout != TIME_INFINITE) && !chVTIsArmedI(&vt))
- return RDY_TIMEOUT;
-
- /* Starts the operation.*/
- dp->CONSET = I2C_CONSET_STA;
-
- /* Waits for the operation completion or a timeout.*/
- i2cp->thread = chThdSelf();
- chSchGoSleepS(THD_STATE_SUSPENDED);
- if ((timeout != TIME_INFINITE) && chVTIsArmedI(&vt))
- chVTResetI(&vt);
-
- return chThdSelf()->p_u.rdymsg;
-}
-
-/**
- * @brief Transmits data via the I2C bus as master.
- * @details Number of receiving bytes must be 0 or more than 1 on STM32F1x.
- * This is hardware restriction.
- *
- * @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) {
- LPC_I2C_TypeDef *dp = i2cp->i2c;
- VirtualTimer vt;
-
- i2cp->addr = addr << 1;
- /* Global timeout for the whole operation.*/
- if (timeout != TIME_INFINITE)
- chVTSetI(&vt, timeout, i2c_lld_safety_timeout, (void *)i2cp);
-
- /* Releases the lock from high level driver.*/
- chSysUnlock();
-
- /* Initializes driver fields */
- i2cp->errors = 0;
- i2cp->txbuf = txbuf;
- i2cp->txbytes = txbytes;
- i2cp->rxbuf = rxbuf;
- i2cp->rxbytes = rxbytes;
-
- /* This lock will be released in high level driver.*/
- chSysLock();
-
- /* Atomic check on the timer in order to make sure that a timeout didn't
- happen outside the critical zone.*/
- if ((timeout != TIME_INFINITE) && !chVTIsArmedI(&vt))
- return RDY_TIMEOUT;
-
- /* Starts the operation.*/
- dp->CONSET = I2C_CONSET_STA;
-
- /* Waits for the operation completion or a timeout.*/
- i2cp->thread = chThdSelf();
- chSchGoSleepS(THD_STATE_SUSPENDED);
-
- if ((timeout != TIME_INFINITE) && chVTIsArmedI(&vt))
- chVTResetI(&vt);
-
- return chThdSelf()->p_u.rdymsg;
-}
-
-#endif /* HAL_USE_I2C */
-
-/** @} */
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