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author | Fabio Utzig <utzig@utzig.org> | 2015-08-30 19:08:17 -0300 |
---|---|---|
committer | Fabio Utzig <utzig@utzig.org> | 2015-08-30 19:08:17 -0300 |
commit | 40014ce2c584274e5e1cee7d08f858bbfc0407f8 (patch) | |
tree | 0092e5f4e57742feb64e73d0521c0c1e94790368 /os/hal | |
parent | a0df184396524a8417ad28f0bae428c889792aa9 (diff) | |
parent | 69d3493ce69118f64ec59edf5c82d3fbb009ec0b (diff) | |
download | ChibiOS-Contrib-40014ce2c584274e5e1cee7d08f858bbfc0407f8.tar.gz ChibiOS-Contrib-40014ce2c584274e5e1cee7d08f858bbfc0407f8.tar.bz2 ChibiOS-Contrib-40014ce2c584274e5e1cee7d08f858bbfc0407f8.zip |
Merge I2C driver
Diffstat (limited to 'os/hal')
-rw-r--r-- | os/hal/boards/WVSHARE_BLE400/board.h | 3 | ||||
-rw-r--r-- | os/hal/ports/NRF51/NRF51822/i2c_lld.c | 446 | ||||
-rw-r--r-- | os/hal/ports/NRF51/NRF51822/i2c_lld.h | 222 | ||||
-rw-r--r-- | os/hal/ports/NRF51/NRF51822/nrf51_delay.h | 51 | ||||
-rw-r--r-- | os/hal/ports/NRF51/NRF51822/platform.mk | 3 |
5 files changed, 723 insertions, 2 deletions
diff --git a/os/hal/boards/WVSHARE_BLE400/board.h b/os/hal/boards/WVSHARE_BLE400/board.h index 0a93c20..57578b5 100644 --- a/os/hal/boards/WVSHARE_BLE400/board.h +++ b/os/hal/boards/WVSHARE_BLE400/board.h @@ -34,11 +34,12 @@ #define LED4 22 #define UART_TX 9 #define UART_RX 11 - #define SPI_SCK 25 #define SPI_MOSI 24 #define SPI_MISO 23 #define SPI_SS 30 +#define I2C_SCL 1 +#define I2C_SDA 0 #if !defined(_FROM_ASM_) #ifdef __cplusplus diff --git a/os/hal/ports/NRF51/NRF51822/i2c_lld.c b/os/hal/ports/NRF51/NRF51822/i2c_lld.c new file mode 100644 index 0000000..611a004 --- /dev/null +++ b/os/hal/ports/NRF51/NRF51822/i2c_lld.c @@ -0,0 +1,446 @@ +/*
+ Copyright (C) 2015 Stephen Caudle
+
+ 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 NRF51822/i2c_lld.c
+ * @brief NRF51822 I2C subsystem low level driver source.
+ *
+ * @addtogroup I2C
+ * @{
+ */
+
+#include "osal.h"
+#include "hal.h"
+#include "nrf51_delay.h"
+
+#if HAL_USE_I2C || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver local definitions. */
+/*===========================================================================*/
+
+/* These macros are needed to see if the slave is stuck and we as master send dummy clock cycles to end its wait */
+#define I2C_HIGH(p) do { NRF_GPIO->OUTSET = (1UL << (p)); } while(0) /*!< Pulls I2C line high */
+#define I2C_LOW(p) do { NRF_GPIO->OUTCLR = (1UL << (p)); } while(0) /*!< Pulls I2C line low */
+#define I2C_INPUT(p) do { NRF_GPIO->DIRCLR = (1UL << (p)); } while(0) /*!< Configures I2C pin as input */
+#define I2C_OUTPUT(p) do { NRF_GPIO->DIRSET = (1UL << (p)); } while(0) /*!< Configures I2C pin as output */
+
+#define I2C_PIN_CNF \
+ ((GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) \
+ | (GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) \
+ | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) \
+ | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) \
+ | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos))
+
+#define I2C_PIN_CNF_CLR \
+ ((GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) \
+ | (GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) \
+ | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) \
+ | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) \
+ | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos))
+
+#if NRF51_I2C_USE_I2C0
+#define I2C_IRQ_NUM SPI0_TWI0_IRQn
+#define I2C_IRQ_PRI NRF51_I2C_I2C0_IRQ_PRIORITY
+#elif NRF51_I2C_USE_I2C1
+#define I2C_IRQ_NUM SPI1_TWI1_IRQn
+#define I2C_IRQ_PRI NRF51_I2C_I2C1_IRQ_PRIORITY
+#endif
+
+/*===========================================================================*/
+/* Driver exported variables. */
+/*===========================================================================*/
+
+/**
+ * @brief I2C0 driver identifier.
+ */
+#if NRF51_I2C_USE_I2C0 || defined(__DOXYGEN__)
+I2CDriver I2CD1;
+#endif
+
+/**
+ * @brief I2C1 driver identifier.
+ */
+#if NRF51_I2C_USE_I2C1 || defined(__DOXYGEN__)
+I2CDriver I2CD2;
+#endif
+
+uint8_t tx_resume_count;
+uint8_t rx_resume_count;
+uint8_t stop_count;
+
+/*===========================================================================*/
+/* Driver local variables and types. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local functions. */
+/*===========================================================================*/
+
+/**
+ * @brief Function for detecting stuck slaves (SDA = 0 and SCL = 1) and tries to clear the bus.
+ *
+ * @return
+ * @retval false Bus is stuck.
+ * @retval true Bus is clear.
+ */
+static void i2c_clear_bus(I2CDriver *i2cp)
+{
+ const I2CConfig *cfg = i2cp->config;
+ int i;
+
+ NRF_GPIO->PIN_CNF[cfg->scl_pad] = I2C_PIN_CNF;
+ NRF_GPIO->PIN_CNF[cfg->sda_pad] = I2C_PIN_CNF;
+
+ I2C_HIGH(cfg->sda_pad);
+ I2C_HIGH(cfg->scl_pad);
+
+ NRF_GPIO->PIN_CNF[cfg->scl_pad] = I2C_PIN_CNF_CLR;
+ NRF_GPIO->PIN_CNF[cfg->sda_pad] = I2C_PIN_CNF_CLR;
+
+ nrf_delay_us(4);
+
+ for(i = 0; i < 9; i++) {
+ if (palReadPad(IOPORT1, cfg->sda_pad)) {
+ if(i > 0)
+ break;
+ else
+ return;
+ }
+
+ I2C_LOW(cfg->scl_pad);
+ nrf_delay_us(4);
+ I2C_HIGH(cfg->scl_pad);
+ nrf_delay_us(4);
+ }
+
+ I2C_LOW(cfg->sda_pad);
+ nrf_delay_us(4);
+ I2C_HIGH(cfg->sda_pad);
+}
+
+static inline void i2c_setup_shortcut(I2CDriver *i2cp)
+{
+ uint32_t rxbytes = i2cp->rxbytes;
+ uint32_t txbytes = i2cp->txbytes;
+
+ osalDbgAssert(rxbytes + txbytes, "transfer must be greater than zero");
+
+ if (txbytes > 1 || (!txbytes && rxbytes > 1))
+ i2cp->i2c->SHORTS = TWI_SHORTS_BB_SUSPEND_Enabled << TWI_SHORTS_BB_SUSPEND_Pos;
+ else if (((txbytes == 1) && !rxbytes) || ((rxbytes == 1) && !txbytes))
+ i2cp->i2c->SHORTS = TWI_SHORTS_BB_STOP_Enabled << TWI_SHORTS_BB_STOP_Pos;
+ else
+ i2cp->i2c->SHORTS = 0;
+}
+
+#if defined(__GNUC__)
+__attribute__((noinline))
+#endif
+/**
+ * @brief Common IRQ handler.
+ * @note Tries hard to clear all the pending interrupt sources, we don't
+ * want to go through the whole ISR and have another interrupt soon
+ * after.
+ *
+ * @param[in] i2cp pointer to an I2CDriver
+ */
+static void serve_interrupt(I2CDriver *i2cp) {
+
+ NRF_TWI_Type *i2c = i2cp->i2c;
+
+ if(i2c->EVENTS_TXDSENT) {
+
+ i2c->EVENTS_TXDSENT = 0;
+
+ if(--i2cp->txbytes) {
+
+ i2c->TXD = *i2cp->txptr++;
+ i2c_setup_shortcut(i2cp);
+ i2c->TASKS_RESUME = 1;
+ tx_resume_count++;
+ }
+ else if (i2cp->rxbytes) {
+
+ i2c_setup_shortcut(i2cp);
+ i2c->TASKS_STARTRX = 1;
+ }
+ }
+ if(i2c->EVENTS_RXDREADY) {
+
+ i2c->EVENTS_RXDREADY = 0;
+ *i2cp->rxptr++ = i2c->RXD;
+
+ if(--i2cp->rxbytes) {
+ i2c_setup_shortcut(i2cp);
+ i2c->TASKS_RESUME = 1;
+ rx_resume_count++;
+ }
+ }
+ if(i2c->EVENTS_ERROR) {
+
+ uint32_t err = i2c->ERRORSRC;
+ i2c->EVENTS_ERROR = 0;
+
+ if (err & TWI_ERRORSRC_OVERRUN_Msk)
+ i2cp->errors |= I2C_OVERRUN;
+ if (err & (TWI_ERRORSRC_ANACK_Msk | TWI_ERRORSRC_DNACK_Msk))
+ i2cp->errors |= I2C_ACK_FAILURE;
+
+ i2c->TASKS_STOP = 1;
+ _i2c_wakeup_error_isr(i2cp);
+ } else if(i2c->EVENTS_STOPPED) {
+
+ stop_count++;
+ i2c->EVENTS_STOPPED = 0;
+ _i2c_wakeup_isr(i2cp);
+ }
+}
+
+/*===========================================================================*/
+/* Driver interrupt handlers. */
+/*===========================================================================*/
+
+#if NRF51_I2C_USE_I2C0 || defined(__DOXYGEN__)
+
+OSAL_IRQ_HANDLER(Vector4C) {
+
+ OSAL_IRQ_PROLOGUE();
+ serve_interrupt(&I2CD1);
+ OSAL_IRQ_EPILOGUE();
+}
+
+#endif
+
+#if NRF51_I2C_USE_I2C1 || defined(__DOXYGEN__)
+
+OSAL_IRQ_HANDLER(Vector50) {
+
+ OSAL_IRQ_PROLOGUE();
+ serve_interrupt(&I2CD2);
+ OSAL_IRQ_EPILOGUE();
+}
+
+#endif
+
+/*===========================================================================*/
+/* Driver exported functions. */
+/*===========================================================================*/
+
+/**
+ * @brief Low level I2C driver initialization.
+ *
+ * @notapi
+ */
+void i2c_lld_init(void) {
+
+#if NRF51_I2C_USE_I2C0
+ i2cObjectInit(&I2CD1);
+ I2CD1.thread = NULL;
+ I2CD1.i2c = NRF_TWI0;
+#endif
+
+#if NRF51_I2C_USE_I2C1
+ i2cObjectInit(&I2CD2);
+ I2CD2.thread = NULL;
+ I2CD2.i2c = NRF_TWI1;
+#endif
+
+}
+
+/**
+ * @brief Configures and activates the I2C peripheral.
+ *
+ * @param[in] i2cp pointer to the @p I2CDriver object
+ *
+ * @notapi
+ */
+void i2c_lld_start(I2CDriver *i2cp) {
+
+ NRF_TWI_Type *i2c = i2cp->i2c;
+ const I2CConfig *cfg = i2cp->config;
+
+ if (i2cp->state != I2C_STOP)
+ return;
+
+ i2c_clear_bus(i2cp);
+
+ NRF_GPIO->PIN_CNF[cfg->scl_pad] = I2C_PIN_CNF;
+ NRF_GPIO->PIN_CNF[cfg->sda_pad] = I2C_PIN_CNF;
+
+ i2c->EVENTS_RXDREADY = 0;
+ i2c->EVENTS_TXDSENT = 0;
+ i2c->PSELSCL = cfg->scl_pad;
+ i2c->PSELSDA = cfg->sda_pad;
+
+ switch (cfg->clock) {
+ case 100000:
+ i2c->FREQUENCY = TWI_FREQUENCY_FREQUENCY_K100 << TWI_FREQUENCY_FREQUENCY_Pos;
+ break;
+ case 250000:
+ i2c->FREQUENCY = TWI_FREQUENCY_FREQUENCY_K250 << TWI_FREQUENCY_FREQUENCY_Pos;
+ break;
+ case 400000:
+ i2c->FREQUENCY = TWI_FREQUENCY_FREQUENCY_K400 << TWI_FREQUENCY_FREQUENCY_Pos;
+ break;
+ default:
+ osalDbgAssert(0, "invalid I2C frequency");
+ break;
+ };
+
+ nvicEnableVector(I2C_IRQ_NUM, I2C_IRQ_PRI);
+
+ i2c->INTENSET = TWI_INTENSET_TXDSENT_Msk | TWI_INTENSET_STOPPED_Msk |
+ TWI_INTENSET_ERROR_Msk | TWI_INTENSET_RXDREADY_Msk;
+
+ i2c->ENABLE = TWI_ENABLE_ENABLE_Enabled << TWI_ENABLE_ENABLE_Pos;
+}
+
+/**
+ * @brief Deactivates the I2C peripheral.
+ *
+ * @param[in] i2cp pointer to the @p I2CDriver object
+ *
+ * @notapi
+ */
+void i2c_lld_stop(I2CDriver *i2cp) {
+
+ NRF_TWI_Type *i2c = i2cp->i2c;
+ const I2CConfig *cfg = i2cp->config;
+
+ if (i2cp->state != I2C_STOP) {
+
+ i2c->ENABLE = TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos;
+
+ i2c->INTENCLR = TWI_INTENSET_TXDSENT_Msk | TWI_INTENSET_STOPPED_Msk |
+ TWI_INTENSET_ERROR_Msk | TWI_INTENSET_RXDREADY_Msk;
+
+ nvicDisableVector(I2C_IRQ_NUM);
+
+ NRF_GPIO->PIN_CNF[cfg->scl_pad] = I2C_PIN_CNF_CLR;
+ NRF_GPIO->PIN_CNF[cfg->sda_pad] = I2C_PIN_CNF_CLR;
+ }
+}
+
+static inline msg_t _i2c_txrx_timeout(I2CDriver *i2cp, i2caddr_t addr,
+ const uint8_t *txbuf, size_t txbytes,
+ uint8_t *rxbuf, size_t rxbytes,
+ systime_t timeout) {
+
+ NRF_TWI_Type *i2c = i2cp->i2c;
+
+ (void)timeout;
+ msg_t msg;
+
+ i2cp->errors = I2C_NO_ERROR;
+ i2cp->addr = addr;
+
+ i2cp->txptr = txbuf;
+ i2cp->txbytes = txbytes;
+
+ i2cp->rxptr = rxbuf;
+ i2cp->rxbytes = rxbytes;
+
+ i2c->ADDRESS = addr;
+
+ tx_resume_count = 0;
+ rx_resume_count = 0;
+ stop_count = 0;
+
+ if (i2cp->txbytes) {
+
+ i2c->TXD = *i2cp->txptr++;
+ i2c_setup_shortcut(i2cp);
+ i2c->TASKS_STARTTX = 1;
+ } else if (i2cp->rxbytes) {
+
+ i2c_setup_shortcut(i2cp);
+ i2c->TASKS_STARTRX = 1;
+ } else {
+
+ osalDbgAssert(0, "no bytes to transfer");
+ }
+
+ msg = osalThreadSuspendTimeoutS(&i2cp->thread, timeout);
+
+ if (msg == MSG_TIMEOUT)
+ i2c->TASKS_STOP = 1;
+
+ return msg;
+}
+
+/**
+ * @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 MSG_OK if the function succeeded.
+ * @retval MSG_RESET if one or more I2C errors occurred, the errors can
+ * be retrieved using @p i2cGetErrors().
+ * @retval MSG_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) {
+
+ return _i2c_txrx_timeout(i2cp, addr, NULL, 0, rxbuf, rxbytes, 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 MSG_OK if the function succeeded.
+ * @retval MSG_RESET if one or more I2C errors occurred, the errors can
+ * be retrieved using @p i2cGetErrors().
+ * @retval MSG_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) {
+
+ return _i2c_txrx_timeout(i2cp, addr, txbuf, txbytes, rxbuf, rxbytes, timeout);
+}
+
+#endif /* HAL_USE_I2C */
+
+/** @} */
diff --git a/os/hal/ports/NRF51/NRF51822/i2c_lld.h b/os/hal/ports/NRF51/NRF51822/i2c_lld.h new file mode 100644 index 0000000..be3ea5b --- /dev/null +++ b/os/hal/ports/NRF51/NRF51822/i2c_lld.h @@ -0,0 +1,222 @@ +/*
+ Copyright (C) 2015 Stephen Caudle
+
+ 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 NRF51822/i2c_lld.h
+ * @brief NRF51822 I2C subsystem low level driver header.
+ *
+ * @addtogroup I2C
+ * @{
+ */
+
+#ifndef _I2C_LLD_H_
+#define _I2C_LLD_H_
+
+#if HAL_USE_I2C || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver constants. */
+/*===========================================================================*/
+
+#define STATE_STOP 0x00
+#define STATE_SEND 0x01
+#define STATE_RECV 0x02
+#define STATE_DUMMY 0x03
+
+/*===========================================================================*/
+/* Driver pre-compile time settings. */
+/*===========================================================================*/
+
+/**
+ * @name Configuration options
+ * @{
+ */
+/**
+ * @brief I2C0 driver enable switch.
+ * @details If set to @p TRUE the support for I2C0 is included.
+ * @note The default is @p FALSE.
+ */
+#if !defined(NRF51_I2C_USE_I2C0) || defined(__DOXYGEN__)
+#define NRF51_I2C_USE_I2C0 FALSE
+#endif
+
+/**
+ * @brief I2C1 driver enable switch.
+ * @details If set to @p TRUE the support for I2C1 is included.
+ * @note The default is @p FALSE.
+ */
+#if !defined(NRF51_I2C_USE_I2C1) || defined(__DOXYGEN__)
+#define NRF51_I2C_USE_I2C1 FALSE
+#endif
+
+/**
+ * @brief I2C0 interrupt priority level setting.
+ */
+#if !defined(NRF51_I2C_I2C0_IRQ_PRIORITY) || defined(__DOXYGEN__)
+#define NRF51_I2C_I2C0_IRQ_PRIORITY 10
+#endif
+
+/**
+ * @brief I2C1 interrupt priority level setting.
+ */
+#if !defined(NRF51_I2C_I2C1_IRQ_PRIORITY) || defined(__DOXYGEN__)
+#define NRF51_I2C_I2C1_IRQ_PRIORITY 10
+#endif
+/** @} */
+
+/*===========================================================================*/
+/* Derived constants and error checks. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver data structures and types. */
+/*===========================================================================*/
+
+/* @brief Type representing I2C address. */
+typedef uint8_t i2caddr_t;
+
+/* @brief Type of I2C Driver condition flags. */
+typedef uint32_t i2cflags_t;
+
+/* @brief Type used to control the ISR state machine. */
+typedef uint8_t intstate_t;
+
+/**
+ * @brief Driver configuration structure.
+ * @note Implementations may extend this structure to contain more,
+ * architecture dependent, fields.
+ */
+
+/**
+ * @brief Driver configuration structure.
+ */
+typedef struct {
+
+ /* @brief Clock to be used for the I2C bus. */
+ uint32_t clock;
+ /* @brief Pad number for SCL */
+ uint8_t scl_pad;
+ /* @brief Pad number for SDA */
+ uint8_t sda_pad;
+
+} I2CConfig;
+
+/**
+ * @brief Type of a structure representing an I2C driver.
+ */
+typedef struct I2CDriver I2CDriver;
+
+/**
+ * @brief Structure representing an I2C driver.
+ */
+struct I2CDriver {
+ /**
+ * @brief Driver state.
+ */
+ i2cstate_t state;
+ /**
+ * @brief Current configuration data.
+ */
+ const I2CConfig *config;
+ /**
+ * @brief Error flags.
+ */
+ i2cflags_t errors;
+#if I2C_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
+#if CH_CFG_USE_MUTEXES || defined(__DOXYGEN__)
+ /**
+ * @brief Mutex protecting the bus.
+ */
+ mutex_t mutex;
+#elif CH_CFG_USE_SEMAPHORES
+ semaphore_t semaphore;
+#endif
+#endif /* I2C_USE_MUTUAL_EXCLUSION */
+#if defined(I2C_DRIVER_EXT_FIELDS)
+ I2C_DRIVER_EXT_FIELDS
+#endif
+ /* @brief Thread waiting for I/O completion. */
+ thread_reference_t thread;
+ /* @brief Current slave address without R/W bit. */
+ i2caddr_t addr;
+
+ /* End of the mandatory fields.*/
+
+ /* @brief Pointer to the buffer with data to send. */
+ const uint8_t *txptr;
+ /* @brief Number of bytes of data to send. */
+ size_t txbytes;
+ /* @brief Pointer to the buffer to put received data. */
+ uint8_t *rxptr;
+ /* @brief Number of bytes of data to receive. */
+ size_t rxbytes;
+ /* @brief Tracks current ISR state. */
+ intstate_t intstate;
+ /* @brief Low-level register access. */
+ NRF_TWI_Type *i2c;
+};
+
+/*===========================================================================*/
+/* Driver macros. */
+/*===========================================================================*/
+
+/**
+ * @brief Get errors from I2C driver.
+ *
+ * @param[in] i2cp pointer to the @p I2CDriver object
+ *
+ * @notapi
+ */
+#define i2c_lld_get_errors(i2cp) ((i2cp)->errors)
+
+/*===========================================================================*/
+/* External declarations. */
+/*===========================================================================*/
+
+#if !defined(__DOXYGEN__)
+
+#if NRF51_I2C_USE_I2C0
+extern I2CDriver I2CD1;
+#endif
+
+#if NRF51_I2C_USE_I2C1
+extern I2CDriver I2CD2;
+#endif
+
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+ void i2c_lld_init(void);
+ void i2c_lld_start(I2CDriver *i2cp);
+ void i2c_lld_stop(I2CDriver *i2cp);
+ 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);
+ msg_t i2c_lld_master_receive_timeout(I2CDriver *i2cp, i2caddr_t addr,
+ uint8_t *rxbuf, size_t rxbytes,
+ systime_t timeout);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HAL_USE_I2C */
+
+#endif /* _I2C_LLD_H_ */
+
+/** @} */
diff --git a/os/hal/ports/NRF51/NRF51822/nrf51_delay.h b/os/hal/ports/NRF51/NRF51822/nrf51_delay.h new file mode 100644 index 0000000..2a672db --- /dev/null +++ b/os/hal/ports/NRF51/NRF51822/nrf51_delay.h @@ -0,0 +1,51 @@ +/* + Copyright (C) 2015 Stephen Caudle + + 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 NRF51822/nrf51_delay.h + * @brief NRF51822 Delay routines + * + * @{ + */ + +#ifndef _NRF_DELAY_H +#define _NRF_DELAY_H + +inline static void nrf_delay_us(uint32_t volatile number_of_us) __attribute__((always_inline)); +inline static void nrf_delay_us(uint32_t volatile number_of_us) +{ +register uint32_t delay asm ("r0") = number_of_us; +__asm volatile ( +".syntax unified\n" + "1:\n" + " SUBS %0, %0, #1\n" + " NOP\n" + " NOP\n" + " NOP\n" + " NOP\n" + " NOP\n" + " NOP\n" + " NOP\n" + " NOP\n" + " NOP\n" + " NOP\n" + " NOP\n" + " NOP\n" + " BNE 1b\n" + ".syntax divided\n" + : "+r" (delay)); +} +#endif //__NRF_DELAY_H diff --git a/os/hal/ports/NRF51/NRF51822/platform.mk b/os/hal/ports/NRF51/NRF51822/platform.mk index 71dd87d..09bb083 100644 --- a/os/hal/ports/NRF51/NRF51822/platform.mk +++ b/os/hal/ports/NRF51/NRF51822/platform.mk @@ -6,7 +6,8 @@ PLATFORMSRC = ${CHIBIOS}/os/hal/ports/common/ARMCMx/nvic.c \ ${CHIBIOS_CONTRIB}/os/hal/ports/NRF51/NRF51822/st_lld.c \ ${CHIBIOS_CONTRIB}/os/hal/ports/NRF51/NRF51822/spi_lld.c \ ${CHIBIOS_CONTRIB}/os/hal/ports/NRF51/NRF51822/ext_lld_isr.c \ - ${CHIBIOS_CONTRIB}/os/hal/ports/NRF51/NRF51822/ext_lld.c + ${CHIBIOS_CONTRIB}/os/hal/ports/NRF51/NRF51822/ext_lld.c \ + ${CHIBIOS_CONTRIB}/os/hal/ports/NRF51/NRF51822/i2c_lld.c # Required include directories PLATFORMINC = ${CHIBIOS}/os/hal/ports/common/ARMCMx \ |