/** * \file * * \brief Two-Wire Interface (TWI) driver for SAM. * * Copyright (c) 2011-2015 Atmel Corporation. All rights reserved. * * \asf_license_start * * \page License * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * 3. The name of Atmel may not be used to endorse or promote products derived * from this software without specific prior written permission. * * 4. This software may only be redistributed and used in connection with an * Atmel microcontroller product. * * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * * \asf_license_stop * */ /* * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a> */ #ifndef TWI_H_INCLUDED #define TWI_H_INCLUDED #include "compiler.h" /// @cond 0 /**INDENT-OFF**/ #ifdef __cplusplus extern "C" { #endif /**INDENT-ON**/ /// @endcond /** Time-out value (number of attempts). */ #define TWI_TIMEOUT 15000 /** * \brief Return codes for TWI APIs. * @{ */ #define TWI_SUCCESS 0 #define TWI_INVALID_ARGUMENT 1 #define TWI_ARBITRATION_LOST 2 #define TWI_NO_CHIP_FOUND 3 #define TWI_RECEIVE_OVERRUN 4 #define TWI_RECEIVE_NACK 5 #define TWI_SEND_OVERRUN 6 #define TWI_SEND_NACK 7 #define TWI_BUSY 8 #define TWI_ERROR_TIMEOUT 9 /** * @} */ /** * \brief Input parameters when initializing the TWI module mode. */ typedef struct twi_options { //! MCK for TWI. uint32_t master_clk; //! The baud rate of the TWI bus. uint32_t speed; //! The desired address. uint8_t chip; //! SMBUS mode (set 1 to use SMBUS quick command, otherwise don't). uint8_t smbus; } twi_options_t; /** * \brief Information concerning the data transmission. */ typedef struct twi_packet { //! TWI address/commands to issue to the other chip (node). uint8_t addr[3]; //! Length of the TWI data address segment (1-3 bytes). uint32_t addr_length; //! Where to find the data to be transferred. void *buffer; //! How many bytes do we want to transfer. uint32_t length; //! TWI chip address to communicate with. uint8_t chip; } twi_packet_t; #if SAMG55 enum twi_source_clock { TWI_SOURCE_PERIPH_CLK = TWI_CWGR_BRSRCCLK_PERIPH_CLK, TWI_SOURCE_PCK_CLK = TWI_CWGR_BRSRCCLK_PMC_PCK, }; #endif void twi_enable_master_mode(Twi *p_twi); void twi_disable_master_mode(Twi *p_twi); uint32_t twi_master_init(Twi *p_twi, const twi_options_t *p_opt); uint32_t twi_set_speed(Twi *p_twi, uint32_t ul_speed, uint32_t ul_mck); uint32_t twi_probe(Twi *p_twi, uint8_t uc_slave_addr); uint32_t twi_master_read(Twi *p_twi, twi_packet_t *p_packet); uint32_t twi_master_write(Twi *p_twi, twi_packet_t *p_packet); void twi_enable_interrupt(Twi *p_twi, uint32_t ul_sources); void twi_disable_interrupt(Twi *p_twi, uint32_t ul_sources); uint32_t twi_get_interrupt_status(Twi *p_twi); uint32_t twi_get_interrupt_mask(Twi *p_twi); uint8_t twi_read_byte(Twi *p_twi); void twi_write_byte(Twi *p_twi, uint8_t uc_byte); void twi_enable_slave_mode(Twi *p_twi); void twi_disable_slave_mode(Twi *p_twi); void twi_slave_init(Twi *p_twi, uint32_t ul_device_addr); void twi_set_slave_addr(Twi *p_twi, uint32_t ul_device_addr); uint32_t twi_slave_read(Twi *p_twi, uint8_t *p_data); uint32_t twi_slave_write(Twi *p_twi, uint8_t *p_data); void twi_reset(Twi *p_twi); Pdc *twi_get_pdc_base(Twi *p_twi); #if (SAM4E || SAM4C || SAMG || SAM4CP || SAM4CM) void twi_set_write_protection(Twi *p_twi, bool flag); void twi_read_write_protection_status(Twi *p_twi, uint32_t *p_status); #endif #if SAMG55 void twi_smbus_set_timing(Twi *p_twi, uint32_t ul_timing); void twi_set_alternative_command(Twi *p_twi, uint32_t ul_alt_cmd); void twi_set_filter(Twi *p_twi, uint32_t ul_filter); void twi_mask_slave_addr(Twi *p_twi, uint32_t ul_mask); void twi_set_sleepwalking(Twi *p_twi, uint32_t ul_matching_addr1, bool flag1, uint32_t ul_matching_addr2, bool flag2, uint32_t ul_matching_addr3, bool flag3, uint32_t ul_matching_data, bool flag); /** * \brief Enable high speed mode. * * \param p_twi Base address of the TWI instance. */ static inline void twi_enable_highspeed(Twi *p_twi) { p_twi->TWI_CR = TWI_CR_HSEN; } /** * \brief Disable high speed mode. * * \param p_twi Base address of the TWI instance. */ static inline void twi_disable_highspeed(Twi *p_twi) { p_twi->TWI_CR = TWI_CR_HSDIS; } /** * \brief Enable SMBus mode. * * \param p_twi Base address of the TWI instance. */ static inline void twi_enable_smbus(Twi *p_twi) { p_twi->TWI_CR = TWI_CR_SMBEN; } /** * \brief Disable SMBus mode. * * \param p_twi Base address of the TWI instance. */ static inline void twi_disable_smbus(Twi *p_twi) { p_twi->TWI_CR = TWI_CR_SMBDIS; } /** * \brief Enable packet error checking. * * \param p_twi Base address of the TWI instance. */ static inline void twi_enable_pec(Twi *p_twi) { p_twi->TWI_CR = TWI_CR_PECEN; } /** * \brief Disable packet error checking. * * \param p_twi Base address of the TWI instance. */ static inline void twi_disable_pec(Twi *p_twi) { p_twi->TWI_CR = TWI_CR_PECDIS; } /** * \brief Request a packet error checking. * * \param p_twi Base address of the TWI instance. */ static inline void twi_request_pec(Twi *p_twi) { p_twi->TWI_CR = TWI_CR_PECRQ; } /** * \brief If master mode is enabled, send a bus clear command. * * \param p_twi Base address of the TWI instance. */ static inline void twi_send_clear(Twi *p_twi) { p_twi->TWI_CR = TWI_CR_CLEAR; } /** * \brief Enable alternative command mode. * * \param p_twi Base address of the TWI instance. */ static inline void twi_enable_alternative_command(Twi *p_twi) { p_twi->TWI_CR = TWI_CR_ACMEN; } /** * \brief Enable alternative command mode. * * \param p_twi Base address of the TWI instance. */ static inline void twi_disable_alternative_command(Twi *p_twi) { p_twi->TWI_CR = TWI_CR_ACMDIS; } /** * \brief Clear the Transmit Holding Register and set TXRDY, TXCOMP flags. * * \param p_twi Base address of the TWI instance. */ static inline void twi_thr_clear(Twi *p_twi) { p_twi->TWI_CR = TWI_CR_THRCLR; } /** * \brief Clear the TWI FSM lock. * * \param p_twi Base address of the TWI instance. */ static inline void twi_lock_clear(Twi *p_twi) { p_twi->TWI_CR = TWI_CR_LOCKCLR; } /** * \brief Normal value to be returned in the ACK cycle of the data phase in slave receiver mode. * * \param p_twi Base address of the TWI instance. */ static inline void twi_disable_slave_nack(Twi *p_twi) { p_twi->TWI_SMR &= ~TWI_SMR_NACKEN; } /** * \brief NACK value to be returned in the ACK cycle of the data phase in slave receiver mode. * * \param p_twi Base address of the TWI instance. */ static inline void twi_enable_slave_nack(Twi *p_twi) { p_twi->TWI_SMR |= TWI_SMR_NACKEN; } /** * \brief Acknowledge of the SMBus Default Address disabled. * * \param p_twi Base address of the TWI instance. */ static inline void twi_disable_slave_default_addr(Twi *p_twi) { p_twi->TWI_SMR &= ~TWI_SMR_SMDA; } /** * \brief Acknowledge of the SMBus Default Address enabled. * * \param p_twi Base address of the TWI instance. */ static inline void twi_enable_slave_default_addr(Twi *p_twi) { p_twi->TWI_SMR |= TWI_SMR_SMDA; } /** * \brief Acknowledge of the SMBus Host Header disabled. * * \param p_twi Base address of the TWI instance. */ static inline void twi_disable_smbus_host_header(Twi *p_twi) { p_twi->TWI_SMR &= ~TWI_SMR_SMHH; } /** * \brief Acknowledge of the SMBus Host Header enabled. * * \param p_twi Base address of the TWI instance. */ static inline void twi_enable_smbus_host_header(Twi *p_twi) { p_twi->TWI_SMR |= TWI_SMR_SMHH; } /** * \brief Clock stretching disabled in slave mode, OVRE and UNRE will indicate overrun and underrun. * * \param p_twi Base address of the TWI instance. */ static inline void twi_disable_clock_wait_state(Twi *p_twi) { p_twi->TWI_SMR |= TWI_SMR_SCLWSDIS; } /** * \brief Clear clock wait state disable mode. * * \param p_twi Base address of the TWI instance. */ static inline void twi_clear_disable_clock_wait_state(Twi *p_twi) { p_twi->TWI_SMR &= ~TWI_SMR_SCLWSDIS; } /** * \brief Slave Address 1 matching disabled. * * \param p_twi Base address of the TWI instance. */ static inline void twi_disable_slave_addr1_matching(Twi *p_twi) { p_twi->TWI_SMR &= ~TWI_SMR_SADR1EN; } /** * \brief Slave Address 1 matching enabled. * * \param p_twi Base address of the TWI instance. */ static inline void twi_enable_slave_addr1_matching(Twi *p_twi) { p_twi->TWI_SMR |= TWI_SMR_SADR1EN; } /** * \brief Slave Address 2 matching disabled. * * \param p_twi Base address of the TWI instance. */ static inline void twi_disable_slave_addr2_matching(Twi *p_twi) { p_twi->TWI_SMR &= ~TWI_SMR_SADR2EN; } /** * \brief Slave Address 2 matching enabled. * * \param p_twi Base address of the TWI instance. */ static inline void twi_enable_slave_addr2_matching(Twi *p_twi) { p_twi->TWI_SMR |= TWI_SMR_SADR2EN; } /** * \brief Slave Address 3 matching disabled. * * \param p_twi Base address of the TWI instance. */ static inline void twi_disable_slave_addr3_matching(Twi *p_twi) { p_twi->TWI_SMR &= ~TWI_SMR_SADR3EN; } /** * \brief Slave Address 3 matching enabled. * * \param p_twi Base address of the TWI instance. */ static inline void twi_enable_slave_addr3_matching(Twi *p_twi) { p_twi->TWI_SMR |= TWI_SMR_SADR3EN; } /** * \brief First received data matching disabled. * * \param p_twi Base address of the TWI instance. */ static inline void twi_disable_slave_data_matching(Twi *p_twi) { p_twi->TWI_SMR &= ~TWI_SMR_DATAMEN; } /** * \brief Select the souce clock for the bit rate generation. * * \param p_twi Base address of the TWI instance. * \param src_clk Source clock. */ static inline void twi_select_source_clock(Twi *p_twi, enum twi_source_clock src_clk) { p_twi->TWI_CWGR &= ~TWI_CWGR_BRSRCCLK; p_twi->TWI_CWGR |= src_clk; } #endif /// @cond 0 /**INDENT-OFF**/ #ifdef __cplusplus } #endif /**INDENT-ON**/ /// @endcond #endif /* TWI_H_INCLUDED */