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Diffstat (limited to 'firmwares/wifishield/wifiHD/src/SOFTWARE_FRAMEWORK/DRIVERS/USART/usart.c')
| -rw-r--r-- | firmwares/wifishield/wifiHD/src/SOFTWARE_FRAMEWORK/DRIVERS/USART/usart.c | 914 |
1 files changed, 914 insertions, 0 deletions
diff --git a/firmwares/wifishield/wifiHD/src/SOFTWARE_FRAMEWORK/DRIVERS/USART/usart.c b/firmwares/wifishield/wifiHD/src/SOFTWARE_FRAMEWORK/DRIVERS/USART/usart.c new file mode 100644 index 0000000..b95882a --- /dev/null +++ b/firmwares/wifishield/wifiHD/src/SOFTWARE_FRAMEWORK/DRIVERS/USART/usart.c @@ -0,0 +1,914 @@ +/* This source file is part of the ATMEL AVR-UC3-SoftwareFramework-1.7.0 Release */ + +/*This file is prepared for Doxygen automatic documentation generation.*/ +/*! \file ********************************************************************* + * + * \brief USART driver for AVR32 UC3. + * + * This file contains basic functions for the AVR32 USART, with support for all + * modes, settings and clock speeds. + * + * - Compiler: IAR EWAVR32 and GNU GCC for AVR32 + * - Supported devices: All AVR32 devices with a USART module can be used. + * - AppNote: + * + * \author Atmel Corporation: http://www.atmel.com \n + * Support and FAQ: http://support.atmel.no/ + * + ******************************************************************************/ + +/* Copyright (c) 2009 Atmel Corporation. All rights reserved. + * + * 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 + * AVR 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 + * + */ + +#include "compiler.h" +#include "usart.h" + + +//------------------------------------------------------------------------------ +/*! \name Private Functions + */ +//! @{ + + +/*! \brief Checks if the USART is in multidrop mode. + * + * \param usart Base address of the USART instance. + * + * \return \c 1 if the USART is in multidrop mode, otherwise \c 0. + */ +#if (defined __GNUC__) +__attribute__((__always_inline__)) +#endif +static __inline__ int usart_mode_is_multidrop(volatile avr32_usart_t *usart) +{ + return ((usart->mr >> AVR32_USART_MR_PAR_OFFSET) & AVR32_USART_MR_PAR_MULTI) == AVR32_USART_MR_PAR_MULTI; +} + + +/*! \brief Calculates a clock divider (\e CD) and a fractional part (\e FP) for + * the USART asynchronous modes to generate a baud rate as close as + * possible to the baud rate set point. + * + * Baud rate calculation: + * \f$ Baudrate = \frac{SelectedClock}{Over \times (CD + \frac{FP}{8})} \f$, \e Over being 16 or 8. + * The maximal oversampling is selected if it allows to generate a baud rate close to the set point. + * + * \param usart Base address of the USART instance. + * \param baudrate Baud rate set point. + * \param pba_hz USART module input clock frequency (PBA clock, Hz). + * + * \retval USART_SUCCESS Baud rate successfully initialized. + * \retval USART_INVALID_INPUT Baud rate set point is out of range for the given input clock frequency. + */ +static int usart_set_async_baudrate(volatile avr32_usart_t *usart, unsigned int baudrate, unsigned long pba_hz) +{ + unsigned int over = (pba_hz >= 16 * baudrate) ? 16 : 8; + unsigned int cd_fp = ((1 << AVR32_USART_BRGR_FP_SIZE) * pba_hz + (over * baudrate) / 2) / (over * baudrate); + unsigned int cd = cd_fp >> AVR32_USART_BRGR_FP_SIZE; + unsigned int fp = cd_fp & ((1 << AVR32_USART_BRGR_FP_SIZE) - 1); + + if (cd < 1 || cd > (1 << AVR32_USART_BRGR_CD_SIZE) - 1) + return USART_INVALID_INPUT; + + usart->mr = (usart->mr & ~(AVR32_USART_MR_USCLKS_MASK | + AVR32_USART_MR_SYNC_MASK | + AVR32_USART_MR_OVER_MASK)) | + AVR32_USART_MR_USCLKS_MCK << AVR32_USART_MR_USCLKS_OFFSET | + ((over == 16) ? AVR32_USART_MR_OVER_X16 : AVR32_USART_MR_OVER_X8) << AVR32_USART_MR_OVER_OFFSET; + + usart->brgr = cd << AVR32_USART_BRGR_CD_OFFSET | + fp << AVR32_USART_BRGR_FP_OFFSET; + + return USART_SUCCESS; +} + + +/*! \brief Calculates a clock divider (\e CD) for the USART synchronous master + * modes to generate a baud rate as close as possible to the baud rate + * set point. + * + * Baud rate calculation: + * \f$ Baudrate = \frac{SelectedClock}{CD} \f$. + * + * \param usart Base address of the USART instance. + * \param baudrate Baud rate set point. + * \param pba_hz USART module input clock frequency (PBA clock, Hz). + * + * \retval USART_SUCCESS Baud rate successfully initialized. + * \retval USART_INVALID_INPUT Baud rate set point is out of range for the given input clock frequency. + */ +static int usart_set_sync_master_baudrate(volatile avr32_usart_t *usart, unsigned int baudrate, unsigned long pba_hz) +{ + unsigned int cd = (pba_hz + baudrate / 2) / baudrate; + + if (cd < 1 || cd > (1 << AVR32_USART_BRGR_CD_SIZE) - 1) + return USART_INVALID_INPUT; + + usart->mr = (usart->mr & ~AVR32_USART_MR_USCLKS_MASK) | + AVR32_USART_MR_USCLKS_MCK << AVR32_USART_MR_USCLKS_OFFSET | + AVR32_USART_MR_SYNC_MASK; + + usart->brgr = cd << AVR32_USART_BRGR_CD_OFFSET; + + return USART_SUCCESS; +} + + +/*! \brief Selects the SCK pin as the source of baud rate for the USART + * synchronous slave modes. + * + * \param usart Base address of the USART instance. + * + * \retval USART_SUCCESS Baud rate successfully initialized. + */ +static int usart_set_sync_slave_baudrate(volatile avr32_usart_t *usart) +{ + usart->mr = (usart->mr & ~AVR32_USART_MR_USCLKS_MASK) | + AVR32_USART_MR_USCLKS_SCK << AVR32_USART_MR_USCLKS_OFFSET | + AVR32_USART_MR_SYNC_MASK; + + return USART_SUCCESS; +} + + +/*! \brief Calculates a clock divider (\e CD) for the USART ISO7816 mode to + * generate an ISO7816 clock as close as possible to the clock set point. + * + * ISO7816 clock calculation: + * \f$ Clock = \frac{SelectedClock}{CD} \f$. + * + * \param usart Base address of the USART instance. + * \param clock ISO7816 clock set point. + * \param pba_hz USART module input clock frequency (PBA clock, Hz). + * + * \retval USART_SUCCESS ISO7816 clock successfully initialized. + * \retval USART_INVALID_INPUT ISO7816 clock set point is out of range for the given input clock frequency. + */ +static int usart_set_iso7816_clock(volatile avr32_usart_t *usart, unsigned int clock, unsigned long pba_hz) +{ + unsigned int cd = (pba_hz + clock / 2) / clock; + + if (cd < 1 || cd > (1 << AVR32_USART_BRGR_CD_SIZE) - 1) + return USART_INVALID_INPUT; + + usart->mr = (usart->mr & ~(AVR32_USART_MR_USCLKS_MASK | + AVR32_USART_MR_SYNC_MASK | + AVR32_USART_MR_OVER_MASK)) | + AVR32_USART_MR_USCLKS_MCK << AVR32_USART_MR_USCLKS_OFFSET | + AVR32_USART_MR_OVER_X16 << AVR32_USART_MR_OVER_OFFSET; + + usart->brgr = cd << AVR32_USART_BRGR_CD_OFFSET; + + return USART_SUCCESS; +} + + +#if defined(AVR32_USART_400_H_INCLUDED) || \ + defined(AVR32_USART_410_H_INCLUDED) || \ + defined(AVR32_USART_420_H_INCLUDED) || \ + defined(AVR32_USART_440_H_INCLUDED) || \ + defined(AVR32_USART_602_H_INCLUDED) + + +/*! \brief Calculates a clock divider (\e CD) for the USART SPI master mode to + * generate a baud rate as close as possible to the baud rate set point. + * + * Baud rate calculation: + * \f$ Baudrate = \frac{SelectedClock}{CD} \f$. + * + * \param usart Base address of the USART instance. + * \param baudrate Baud rate set point. + * \param pba_hz USART module input clock frequency (PBA clock, Hz). + * + * \retval USART_SUCCESS Baud rate successfully initialized. + * \retval USART_INVALID_INPUT Baud rate set point is out of range for the given input clock frequency. + */ +static int usart_set_spi_master_baudrate(volatile avr32_usart_t *usart, unsigned int baudrate, unsigned long pba_hz) +{ + unsigned int cd = (pba_hz + baudrate / 2) / baudrate; + + if (cd < 4 || cd > (1 << AVR32_USART_BRGR_CD_SIZE) - 1) + return USART_INVALID_INPUT; + + usart->mr = (usart->mr & ~AVR32_USART_MR_USCLKS_MASK) | + AVR32_USART_MR_USCLKS_MCK << AVR32_USART_MR_USCLKS_OFFSET; + + usart->brgr = cd << AVR32_USART_BRGR_CD_OFFSET; + + return USART_SUCCESS; +} + + +/*! \brief Selects the SCK pin as the source of baud rate for the USART SPI + * slave mode. + * + * \param usart Base address of the USART instance. + * + * \retval USART_SUCCESS Baud rate successfully initialized. + */ +static int usart_set_spi_slave_baudrate(volatile avr32_usart_t *usart) +{ + usart->mr = (usart->mr & ~AVR32_USART_MR_USCLKS_MASK) | + AVR32_USART_MR_USCLKS_SCK << AVR32_USART_MR_USCLKS_OFFSET; + + return USART_SUCCESS; +} + + +#endif // USART rev. >= 4.0.0 + + +//! @} + + +//------------------------------------------------------------------------------ +/*! \name Initialization Functions + */ +//! @{ + + +void usart_reset(volatile avr32_usart_t *usart) +{ + Bool global_interrupt_enabled = Is_global_interrupt_enabled(); + + // Disable all USART interrupts. + // Interrupts needed should be set explicitly on every reset. + if (global_interrupt_enabled) Disable_global_interrupt(); + usart->idr = 0xFFFFFFFF; + usart->csr; + if (global_interrupt_enabled) Enable_global_interrupt(); + + // Reset mode and other registers that could cause unpredictable behavior after reset. + usart->mr = 0; + usart->rtor = 0; + usart->ttgr = 0; + + // Shutdown TX and RX (will be re-enabled when setup has successfully completed), + // reset status bits and turn off DTR and RTS. + usart->cr = AVR32_USART_CR_RSTRX_MASK | + AVR32_USART_CR_RSTTX_MASK | + AVR32_USART_CR_RSTSTA_MASK | + AVR32_USART_CR_RSTIT_MASK | + AVR32_USART_CR_RSTNACK_MASK | +#ifndef AVR32_USART_440_H_INCLUDED +// Note: Modem Signal Management DTR-DSR-DCD-RI are not included in USART rev.440. + AVR32_USART_CR_DTRDIS_MASK | +#endif + AVR32_USART_CR_RTSDIS_MASK; +} + + +int usart_init_rs232(volatile avr32_usart_t *usart, const usart_options_t *opt, long pba_hz) +{ + // Reset the USART and shutdown TX and RX. + usart_reset(usart); + + // Check input values. + if (!opt || // Null pointer. + opt->charlength < 5 || opt->charlength > 9 || + opt->paritytype > 7 || + opt->stopbits > 2 + 255 || + opt->channelmode > 3 || + usart_set_async_baudrate(usart, opt->baudrate, pba_hz) == USART_INVALID_INPUT) + return USART_INVALID_INPUT; + + if (opt->charlength == 9) + { + // Character length set to 9 bits. MODE9 dominates CHRL. + usart->mr |= AVR32_USART_MR_MODE9_MASK; + } + else + { + // CHRL gives the character length (- 5) when MODE9 = 0. + usart->mr |= (opt->charlength - 5) << AVR32_USART_MR_CHRL_OFFSET; + } + + usart->mr |= opt->paritytype << AVR32_USART_MR_PAR_OFFSET | + opt->channelmode << AVR32_USART_MR_CHMODE_OFFSET; + + if (opt->stopbits > USART_2_STOPBITS) + { + // Set two stop bits + usart->mr |= AVR32_USART_MR_NBSTOP_2 << AVR32_USART_MR_NBSTOP_OFFSET; + // and a timeguard period gives the rest. + usart->ttgr = opt->stopbits - USART_2_STOPBITS; + } + else + // Insert 1, 1.5 or 2 stop bits. + usart->mr |= opt->stopbits << AVR32_USART_MR_NBSTOP_OFFSET; + + // Set normal mode. + usart->mr = (usart->mr & ~AVR32_USART_MR_MODE_MASK) | + AVR32_USART_MR_MODE_NORMAL << AVR32_USART_MR_MODE_OFFSET; + + // Setup complete; enable communication. + // Enable input and output. + usart->cr = AVR32_USART_CR_RXEN_MASK | + AVR32_USART_CR_TXEN_MASK; + + return USART_SUCCESS; +} + + +int usart_init_rs232_tx_only(volatile avr32_usart_t *usart, const usart_options_t *opt, long pba_hz) +{ + // Reset the USART and shutdown TX and RX. + usart_reset(usart); + + // Check input values. + if (!opt || // Null pointer. + opt->charlength < 5 || opt->charlength > 9 || + opt->paritytype > 7 || + opt->stopbits == 1 || opt->stopbits > 2 + 255 || + opt->channelmode > 3 || + usart_set_sync_master_baudrate(usart, opt->baudrate, pba_hz) == USART_INVALID_INPUT) + return USART_INVALID_INPUT; + + if (opt->charlength == 9) + { + // Character length set to 9 bits. MODE9 dominates CHRL. + usart->mr |= AVR32_USART_MR_MODE9_MASK; + } + else + { + // CHRL gives the character length (- 5) when MODE9 = 0. + usart->mr |= (opt->charlength - 5) << AVR32_USART_MR_CHRL_OFFSET; + } + + usart->mr |= opt->paritytype << AVR32_USART_MR_PAR_OFFSET | + opt->channelmode << AVR32_USART_MR_CHMODE_OFFSET; + + if (opt->stopbits > USART_2_STOPBITS) + { + // Set two stop bits + usart->mr |= AVR32_USART_MR_NBSTOP_2 << AVR32_USART_MR_NBSTOP_OFFSET; + // and a timeguard period gives the rest. + usart->ttgr = opt->stopbits - USART_2_STOPBITS; + } + else + // Insert 1 or 2 stop bits. + usart->mr |= opt->stopbits << AVR32_USART_MR_NBSTOP_OFFSET; + + // Set normal mode. + usart->mr = (usart->mr & ~AVR32_USART_MR_MODE_MASK) | + AVR32_USART_MR_MODE_NORMAL << AVR32_USART_MR_MODE_OFFSET; + + // Setup complete; enable communication. + // Enable only output as input is not possible in synchronous mode without + // transferring clock. + usart->cr = AVR32_USART_CR_TXEN_MASK; + + return USART_SUCCESS; +} + + +int usart_init_hw_handshaking(volatile avr32_usart_t *usart, const usart_options_t *opt, long pba_hz) +{ + // First: Setup standard RS232. + if (usart_init_rs232(usart, opt, pba_hz) == USART_INVALID_INPUT) + return USART_INVALID_INPUT; + + // Set hardware handshaking mode. + usart->mr = (usart->mr & ~AVR32_USART_MR_MODE_MASK) | + AVR32_USART_MR_MODE_HARDWARE << AVR32_USART_MR_MODE_OFFSET; + + return USART_SUCCESS; +} + + +int usart_init_modem(volatile avr32_usart_t *usart, const usart_options_t *opt, long pba_hz) +{ + // First: Setup standard RS232. + if (usart_init_rs232(usart, opt, pba_hz) == USART_INVALID_INPUT) + return USART_INVALID_INPUT; + + // Set modem mode. + usart->mr = (usart->mr & ~AVR32_USART_MR_MODE_MASK) | + AVR32_USART_MR_MODE_MODEM << AVR32_USART_MR_MODE_OFFSET; + + return USART_SUCCESS; +} + + +int usart_init_sync_master(volatile avr32_usart_t *usart, const usart_options_t *opt, long pba_hz) +{ + // Reset the USART and shutdown TX and RX. + usart_reset(usart); + + // Check input values. + if (!opt || // Null pointer. + opt->charlength < 5 || opt->charlength > 9 || + opt->paritytype > 7 || + opt->stopbits == 1 || opt->stopbits > 2 + 255 || + opt->channelmode > 3 || + usart_set_sync_master_baudrate(usart, opt->baudrate, pba_hz) == USART_INVALID_INPUT) + return USART_INVALID_INPUT; + + if (opt->charlength == 9) + { + // Character length set to 9 bits. MODE9 dominates CHRL. + usart->mr |= AVR32_USART_MR_MODE9_MASK; + } + else + { + // CHRL gives the character length (- 5) when MODE9 = 0. + usart->mr |= (opt->charlength - 5) << AVR32_USART_MR_CHRL_OFFSET; + } + + usart->mr |= opt->paritytype << AVR32_USART_MR_PAR_OFFSET | + opt->channelmode << AVR32_USART_MR_CHMODE_OFFSET; + + if (opt->stopbits > USART_2_STOPBITS) + { + // Set two stop bits + usart->mr |= AVR32_USART_MR_NBSTOP_2 << AVR32_USART_MR_NBSTOP_OFFSET; + // and a timeguard period gives the rest. + usart->ttgr = opt->stopbits - USART_2_STOPBITS; + } + else + // Insert 1 or 2 stop bits. + usart->mr |= opt->stopbits << AVR32_USART_MR_NBSTOP_OFFSET; + + // Set normal mode. + usart->mr = (usart->mr & ~AVR32_USART_MR_MODE_MASK) | + AVR32_USART_MR_MODE_NORMAL << AVR32_USART_MR_MODE_OFFSET | + AVR32_USART_MR_CLKO_MASK; + + // Setup complete; enable communication. + // Enable input and output. + usart->cr = AVR32_USART_CR_RXEN_MASK | + AVR32_USART_CR_TXEN_MASK; + + return USART_SUCCESS; +} + + +int usart_init_sync_slave(volatile avr32_usart_t *usart, const usart_options_t *opt, long pba_hz) +{ + // Reset the USART and shutdown TX and RX. + usart_reset(usart); + + // Check input values. + if (!opt || // Null pointer. + opt->charlength < 5 || opt->charlength > 9 || + opt->paritytype > 7 || + opt->stopbits == 1 || opt->stopbits > 2 + 255 || + opt->channelmode > 3 || + usart_set_sync_slave_baudrate(usart) == USART_INVALID_INPUT) + return USART_INVALID_INPUT; + + if (opt->charlength == 9) + { + // Character length set to 9 bits. MODE9 dominates CHRL. + usart->mr |= AVR32_USART_MR_MODE9_MASK; + } + else + { + // CHRL gives the character length (- 5) when MODE9 = 0. + usart->mr |= (opt->charlength - 5) << AVR32_USART_MR_CHRL_OFFSET; + } + + usart->mr |= opt->paritytype << AVR32_USART_MR_PAR_OFFSET | + opt->channelmode << AVR32_USART_MR_CHMODE_OFFSET; + + if (opt->stopbits > USART_2_STOPBITS) + { + // Set two stop bits + usart->mr |= AVR32_USART_MR_NBSTOP_2 << AVR32_USART_MR_NBSTOP_OFFSET; + // and a timeguard period gives the rest. + usart->ttgr = opt->stopbits - USART_2_STOPBITS; + } + else + // Insert 1 or 2 stop bits. + usart->mr |= opt->stopbits << AVR32_USART_MR_NBSTOP_OFFSET; + + // Set normal mode. + usart->mr = (usart->mr & ~AVR32_USART_MR_MODE_MASK) | + AVR32_USART_MR_MODE_NORMAL << AVR32_USART_MR_MODE_OFFSET; + + // Setup complete; enable communication. + // Enable input and output. + usart->cr = AVR32_USART_CR_RXEN_MASK | + AVR32_USART_CR_TXEN_MASK; + + return USART_SUCCESS; +} + + +int usart_init_rs485(volatile avr32_usart_t *usart, const usart_options_t *opt, long pba_hz) +{ + // First: Setup standard RS232. + if (usart_init_rs232(usart, opt, pba_hz) == USART_INVALID_INPUT) + return USART_INVALID_INPUT; + + // Set RS485 mode. + usart->mr = (usart->mr & ~AVR32_USART_MR_MODE_MASK) | + AVR32_USART_MR_MODE_RS485 << AVR32_USART_MR_MODE_OFFSET; + + return USART_SUCCESS; +} + + +int usart_init_IrDA(volatile avr32_usart_t *usart, const usart_options_t *opt, + long pba_hz, unsigned char irda_filter) +{ + // First: Setup standard RS232. + if (usart_init_rs232(usart, opt, pba_hz) == USART_INVALID_INPUT) + return USART_INVALID_INPUT; + + // Set IrDA filter. + usart->ifr = irda_filter; + + // Set IrDA mode and activate filtering of input. + usart->mr = (usart->mr & ~AVR32_USART_MR_MODE_MASK) | + AVR32_USART_MODE_IRDA << AVR32_USART_MR_MODE_OFFSET | + AVR32_USART_MR_FILTER_MASK; + + return USART_SUCCESS; +} + + +int usart_init_iso7816(volatile avr32_usart_t *usart, const usart_iso7816_options_t *opt, int t, long pba_hz) +{ + // Reset the USART and shutdown TX and RX. + usart_reset(usart); + + // Check input values. + if (!opt || // Null pointer. + opt->paritytype > 1) + return USART_INVALID_INPUT; + + if (t == 0) + { + // Set USART mode to ISO7816, T=0. + // The T=0 protocol always uses 2 stop bits. + usart->mr = AVR32_USART_MR_MODE_ISO7816_T0 << AVR32_USART_MR_MODE_OFFSET | + AVR32_USART_MR_NBSTOP_2 << AVR32_USART_MR_NBSTOP_OFFSET | + opt->bit_order << AVR32_USART_MR_MSBF_OFFSET; // Allow MSBF in T=0. + } + else if (t == 1) + { + // Only LSB first in the T=1 protocol. + // max_iterations field is only used in T=0 mode. + if (opt->bit_order != 0 || + opt->max_iterations != 0) + return USART_INVALID_INPUT; + + // Set USART mode to ISO7816, T=1. + // The T=1 protocol always uses 1 stop bit. + usart->mr = AVR32_USART_MR_MODE_ISO7816_T1 << AVR32_USART_MR_MODE_OFFSET | + AVR32_USART_MR_NBSTOP_1 << AVR32_USART_MR_NBSTOP_OFFSET; + } + else + return USART_INVALID_INPUT; + + if (usart_set_iso7816_clock(usart, opt->iso7816_hz, pba_hz) == USART_INVALID_INPUT) + return USART_INVALID_INPUT; + + // Set FIDI register: bit rate = selected clock/FI_DI_ratio/16. + usart->fidi = opt->fidi_ratio; + + // Set ISO7816 spesific options in the MODE register. + usart->mr |= opt->paritytype << AVR32_USART_MR_PAR_OFFSET | + AVR32_USART_MR_CLKO_MASK | // Enable clock output. + opt->inhibit_nack << AVR32_USART_MR_INACK_OFFSET | + opt->dis_suc_nack << AVR32_USART_MR_DSNACK_OFFSET | + opt->max_iterations << AVR32_USART_MR_MAX_ITERATION_OFFSET; + + // Setup complete; enable the receiver by default. + usart_iso7816_enable_receiver(usart); + + return USART_SUCCESS; +} + + +#if defined(AVR32_USART_400_H_INCLUDED) || \ + defined(AVR32_USART_410_H_INCLUDED) || \ + defined(AVR32_USART_420_H_INCLUDED) || \ + defined(AVR32_USART_440_H_INCLUDED) || \ + defined(AVR32_USART_602_H_INCLUDED) + + +int usart_init_lin_master(volatile avr32_usart_t *usart, unsigned long baudrate, long pba_hz) +{ + // Reset the USART and shutdown TX and RX. + usart_reset(usart); + + // Check input values. + if (usart_set_async_baudrate(usart, baudrate, pba_hz) == USART_INVALID_INPUT) + return USART_INVALID_INPUT; + + usart->mr |= AVR32_USART_MR_MODE_LIN_MASTER << AVR32_USART_MR_MODE_OFFSET; // LIN master mode. + + // Setup complete; enable communication. + // Enable input and output. + usart->cr = AVR32_USART_CR_RXEN_MASK | + AVR32_USART_CR_TXEN_MASK; + + return USART_SUCCESS; +} + + +int usart_init_lin_slave(volatile avr32_usart_t *usart, unsigned long baudrate, long pba_hz) +{ + // Reset the USART and shutdown TX and RX. + usart_reset(usart); + + // Check input values. + if (usart_set_async_baudrate(usart, baudrate, pba_hz) == USART_INVALID_INPUT) + return USART_INVALID_INPUT; + + usart->mr |= AVR32_USART_MR_MODE_LIN_SLAVE << AVR32_USART_MR_MODE_OFFSET; // LIN slave mode. + + // Setup complete; enable communication. + // Enable input and output. + usart->cr = AVR32_USART_CR_RXEN_MASK | + AVR32_USART_CR_TXEN_MASK; + + return USART_SUCCESS; +} + + +int usart_init_spi_master(volatile avr32_usart_t *usart, const usart_spi_options_t *opt, long pba_hz) +{ + // Reset the USART and shutdown TX and RX. + usart_reset(usart); + + // Check input values. + if (!opt || // Null pointer. + opt->charlength < 5 || opt->charlength > 9 || + opt->spimode > 3 || + opt->channelmode > 3 || + usart_set_spi_master_baudrate(usart, opt->baudrate, pba_hz) == USART_INVALID_INPUT) + return USART_INVALID_INPUT; + + if (opt->charlength == 9) + { + // Character length set to 9 bits. MODE9 dominates CHRL. + usart->mr |= AVR32_USART_MR_MODE9_MASK; + } + else + { + // CHRL gives the character length (- 5) when MODE9 = 0. + usart->mr |= (opt->charlength - 5) << AVR32_USART_MR_CHRL_OFFSET; + } + + usart->mr |= AVR32_USART_MR_MODE_SPI_MASTER << AVR32_USART_MR_MODE_OFFSET | // SPI master mode. + ((opt->spimode & 0x1) ^ 0x1) << AVR32_USART_MR_SYNC_OFFSET | // SPI clock phase. + opt->channelmode << AVR32_USART_MR_CHMODE_OFFSET | // Channel mode. + (opt->spimode >> 1) << AVR32_USART_MR_MSBF_OFFSET | // SPI clock polarity. + AVR32_USART_MR_CLKO_MASK; // Drive SCK pin. + + // Setup complete; enable communication. + // Enable input and output. + usart->cr = AVR32_USART_CR_RXEN_MASK | + AVR32_USART_CR_TXEN_MASK; + + return USART_SUCCESS; +} + + +int usart_init_spi_slave(volatile avr32_usart_t *usart, const usart_spi_options_t *opt, long pba_hz) +{ + // Reset the USART and shutdown TX and RX. + usart_reset(usart); + + // Check input values. + if (!opt || // Null pointer. + opt->charlength < 5 || opt->charlength > 9 || + opt->spimode > 3 || + opt->channelmode > 3 || + usart_set_spi_slave_baudrate(usart) == USART_INVALID_INPUT) + return USART_INVALID_INPUT; + + if (opt->charlength == 9) + { + // Character length set to 9 bits. MODE9 dominates CHRL. + usart->mr |= AVR32_USART_MR_MODE9_MASK; + } + else + { + // CHRL gives the character length (- 5) when MODE9 = 0. + usart->mr |= (opt->charlength - 5) << AVR32_USART_MR_CHRL_OFFSET; + } + + usart->mr |= AVR32_USART_MR_MODE_SPI_SLAVE << AVR32_USART_MR_MODE_OFFSET | // SPI slave mode. + ((opt->spimode & 0x1) ^ 0x1) << AVR32_USART_MR_SYNC_OFFSET | // SPI clock phase. + opt->channelmode << AVR32_USART_MR_CHMODE_OFFSET | // Channel mode. + (opt->spimode >> 1) << AVR32_USART_MR_MSBF_OFFSET; // SPI clock polarity. + + // Setup complete; enable communication. + // Enable input and output. + usart->cr = AVR32_USART_CR_RXEN_MASK | + AVR32_USART_CR_TXEN_MASK; + + return USART_SUCCESS; +} + + +#endif // USART rev. >= 4.0.0 + + +//! @} + + +//------------------------------------------------------------------------------ +#if defined(AVR32_USART_400_H_INCLUDED) || \ + defined(AVR32_USART_410_H_INCLUDED) || \ + defined(AVR32_USART_420_H_INCLUDED) || \ + defined(AVR32_USART_440_H_INCLUDED) || \ + defined(AVR32_USART_602_H_INCLUDED) + + +/*! \name SPI Control Functions + */ +//! @{ + + +int usart_spi_selectChip(volatile avr32_usart_t *usart) +{ + // Force the SPI chip select. + usart->cr = AVR32_USART_CR_RTSEN_MASK; + + return USART_SUCCESS; +} + + +int usart_spi_unselectChip(volatile avr32_usart_t *usart) +{ + int timeout = USART_DEFAULT_TIMEOUT; + + do + { + if (!timeout--) return USART_FAILURE; + } while (!usart_tx_empty(usart)); + + // Release the SPI chip select. + usart->cr = AVR32_USART_CR_RTSDIS_MASK; + + return USART_SUCCESS; +} + + +//! @} + + +#endif // USART rev. >= 4.0.0 + + +//------------------------------------------------------------------------------ +/*! \name Transmit/Receive Functions + */ +//! @{ + + +int usart_send_address(volatile avr32_usart_t *usart, int address) +{ + // Check if USART is in multidrop / RS485 mode. + if (!usart_mode_is_multidrop(usart)) return USART_MODE_FAULT; + + // Prepare to send an address. + usart->cr = AVR32_USART_CR_SENDA_MASK; + + // Write the address to TX. + usart_bw_write_char(usart, address); + + return USART_SUCCESS; +} + + +int usart_write_char(volatile avr32_usart_t *usart, int c) +{ + if (usart_tx_ready(usart)) + { + usart->thr = (c << AVR32_USART_THR_TXCHR_OFFSET) & AVR32_USART_THR_TXCHR_MASK; + return USART_SUCCESS; + } + else + return USART_TX_BUSY; +} + + +int usart_putchar(volatile avr32_usart_t *usart, int c) +{ + int timeout = USART_DEFAULT_TIMEOUT; + + if (c == '\n') + { + do + { + if (!timeout--) return USART_FAILURE; + } while (usart_write_char(usart, '\r') != USART_SUCCESS); + + timeout = USART_DEFAULT_TIMEOUT; + } + + do + { + if (!timeout--) return USART_FAILURE; + } while (usart_write_char(usart, c) != USART_SUCCESS); + + return USART_SUCCESS; +} + + +int usart_read_char(volatile avr32_usart_t *usart, int *c) +{ + // Check for errors: frame, parity and overrun. In RS485 mode, a parity error + // would mean that an address char has been received. + if (usart->csr & (AVR32_USART_CSR_OVRE_MASK | + AVR32_USART_CSR_FRAME_MASK | + AVR32_USART_CSR_PARE_MASK)) + return USART_RX_ERROR; + + // No error; if we really did receive a char, read it and return SUCCESS. + if (usart_test_hit(usart)) + { + *c = (usart->rhr & AVR32_USART_RHR_RXCHR_MASK) >> AVR32_USART_RHR_RXCHR_OFFSET; + return USART_SUCCESS; + } + else + return USART_RX_EMPTY; +} + + +int usart_getchar(volatile avr32_usart_t *usart) +{ + int c, ret; + + while ((ret = usart_read_char(usart, &c)) == USART_RX_EMPTY); + + if (ret == USART_RX_ERROR) + return USART_FAILURE; + + return c; +} + + +void usart_write_line(volatile avr32_usart_t *usart, const char *string) +{ + while (*string != '\0') + usart_putchar(usart, *string++); +} + + +int usart_get_echo_line(volatile avr32_usart_t *usart) +{ + int rx_char; + int retval = USART_SUCCESS; + + while (1) + { + rx_char = usart_getchar(usart); + if (rx_char == USART_FAILURE) + { + usart_write_line(usart, "Error!!!\n"); + retval = USART_FAILURE; + break; + } + if (rx_char == '\x03') + { + retval = USART_FAILURE; + break; + } + usart_putchar(usart, rx_char); + if (rx_char == '\r') + { + usart_putchar(usart, '\n'); + break; + } + } + + return retval; +} + + +//! @} |