1 /* ----------------------------------------------------------------------------
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2 * SAM Software Package License
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3 * ----------------------------------------------------------------------------
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4 * Copyright (c) 2015, Atmel Corporation
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6 * All rights reserved.
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions are met:
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11 * - Redistributions of source code must retain the above copyright notice,
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12 * this list of conditions and the disclaimer below.
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14 * Atmel's name may not be used to endorse or promote products derived from
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15 * this software without specific prior written permission.
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17 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
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18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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20 * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
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21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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23 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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24 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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25 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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26 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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27 * ----------------------------------------------------------------------------
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33 * Interface for configuration the Two Wire Interface (TWI) peripheral.
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40 /*------------------------------------------------------------------------------
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42 *------------------------------------------------------------------------------*/
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48 /*----------------------------------------------------------------------------
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50 *----------------------------------------------------------------------------*/
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51 /* Returns 1 if the TXRDY bit (ready to transmit data) is set in the given status register value.*/
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52 #define TWI_STATUS_TXRDY(status) ((status & TWI_SR_TXRDY) == TWI_SR_TXRDY)
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54 /* Returns 1 if the RXRDY bit (ready to receive data) is set in the given status register value.*/
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55 #define TWI_STATUS_RXRDY(status) ((status & TWI_SR_RXRDY) == TWI_SR_RXRDY)
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57 /* Returns 1 if the TXCOMP bit (transfer complete) is set in the given status register value.*/
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58 #define TWI_STATUS_TXCOMP(status) ((status & TWI_SR_TXCOMP) == TWI_SR_TXCOMP)
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64 /*----------------------------------------------------------------------------
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66 *----------------------------------------------------------------------------*/
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68 extern void twi_configure_master(Twi * pTwi, uint32_t twck);
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69 extern void twi_configure_slave(Twi * pTwi, uint8_t slaveAddress);
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70 extern void twi_stop(Twi * pTwi);
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71 extern void twi_start_read(Twi * pTwi, uint8_t address,
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72 uint32_t iaddress, uint8_t isize);
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73 extern uint8_t twi_read_byte(Twi * pTwi);
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74 extern void twi_write_byte(Twi * pTwi, uint8_t byte);
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75 extern void twi_start_write(Twi * pTwi, uint8_t address, uint32_t iaddress,
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76 uint8_t isize, uint8_t byte);
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77 extern uint8_t twi_is_byte_received(Twi * pTwi);
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78 extern uint8_t twi_byte_sent(Twi * pTwi);
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79 extern uint8_t twi_is_transfer_complete(Twi * pTwi);
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80 extern void twi_enable_it(Twi * pTwi, uint32_t sources);
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81 extern void twi_disable_it(Twi * pTwi, uint32_t sources);
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82 extern uint32_t twi_get_status(Twi * pTwi);
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83 extern uint32_t twi_get_masked_status(Twi * pTwi);
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84 extern void twi_send_stop_condition(Twi * pTwi);
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86 #ifdef CONFIG_HAVE_TWI_ALTERNATE_CMD
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87 extern void twi_init_write_transfert(Twi * twi, uint8_t addr, uint32_t iaddress,
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88 uint8_t isize, uint8_t len);
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89 extern void twi_init_read_transfert(Twi * twi, uint8_t addr, uint32_t iaddress,
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90 uint8_t isize, uint8_t len);
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93 #ifdef CONFIG_HAVE_TWI_FIFO
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94 extern void twi_fifo_configure(Twi* twi, uint8_t tx_thres,
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96 uint32_t ready_modes);
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97 extern void twi_fifo_disable(Twi* twi);
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99 extern uint32_t twi_fifo_rx_size(Twi *twi);
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100 extern uint32_t twi_fifo_tx_size(Twi *twi);
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102 extern uint32_t twi_read_stream(Twi *twi, uint32_t addr, uint32_t iaddr,
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103 uint32_t isize, const void *stream, uint8_t len);
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104 extern uint32_t twi_write_stream(Twi *twi, uint32_t addr, uint32_t iaddr,
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105 uint32_t isize, const void *stream, uint8_t len);
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111 #endif /* #ifndef _TWI_H_ */
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