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Diffstat (limited to 'FreeRTOS/Demo/CORTEX_M7_SAMV71_Xplained/libchip_samv7/source/dacc.c')
| -rw-r--r-- | FreeRTOS/Demo/CORTEX_M7_SAMV71_Xplained/libchip_samv7/source/dacc.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/FreeRTOS/Demo/CORTEX_M7_SAMV71_Xplained/libchip_samv7/source/dacc.c b/FreeRTOS/Demo/CORTEX_M7_SAMV71_Xplained/libchip_samv7/source/dacc.c new file mode 100644 index 000000000..a929d031c --- /dev/null +++ b/FreeRTOS/Demo/CORTEX_M7_SAMV71_Xplained/libchip_samv7/source/dacc.c @@ -0,0 +1,184 @@ +/* ----------------------------------------------------------------------------
+ * SAM Software Package License
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2011, 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:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: 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
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+/** \addtogroup dacc_module Working with DACC
+ * \ingroup peripherals_module
+ * The DACC driver provides the interface to configure and use the DACC peripheral.\n
+ *
+ * The DACC(Digital-to-Analog Converter Controller) converts digital code to analog output.
+ * The data to be converted are sent in a common register for all channels. It offers up to 2
+ * analog outputs.The output voltage ranges from (1/6)ADVREF to (5/6)ADVREF.
+ *
+ * To Enable a DACC conversion,the user has to follow these few steps:
+ * <ul>
+ * <li> Select an appropriate reference voltage on ADVREF </li>
+ * <li> Configure the DACC according to its requirements and special needs,which could be
+ broken down into several parts:
+ * -# Enable DACC in free running mode by clearing TRGEN in DACC_MR;
+ * -# Configure Startup Time and Refresh Period through setting STARTUP and REFRESH fields
+ * in DACC_MR; The refresh mechanism is used to protect the output analog value from
+ * decreasing.
+ * -# Enable channels and write digital code to DACC_CDR,in free running mode, the conversion
+ * is started right after at least one channel is enabled and data is written .
+ </li>
+ * </ul>
+ *
+ * For more accurate information, please look at the DACC section of the
+ * Datasheet.
+ *
+ * Related files :\n
+ * \ref DACC.c\n
+ * \ref DACC.h\n
+*/
+/*@{*/
+/*@}*/
+/**
+ * \file
+ *
+ * Implementation of Digital-to-Analog Converter Controller (DACC).
+ *
+ */
+/*----------------------------------------------------------------------------
+ * Headers
+ *----------------------------------------------------------------------------*/
+
+#include "chip.h"
+
+#include <stdint.h>
+#include <assert.h>
+
+/*----------------------------------------------------------------------------
+ * Exported functions
+ *----------------------------------------------------------------------------*/
+
+/**
+ * \brief Initialize the DACC controller
+ * \param pDACC Pointer to an DACC instance.
+ * \param idDACC identifier of DAC peripheral
+ * \param trgEn trigger mode, free running mode or external Hardware trigger
+ * \param word transfer size,word or half word
+ * \param trgSel hardware trigger selection
+ * \param sleepMode sleep mode selection
+ * \param mck value of MCK in Hz
+ * \param refresh refresh period
+ * \param user_sel user channel selection ,0 or 1
+ * \param tag_mode tag for channel number
+ * \param startup value of the start up time (in DACCClock) (see datasheet)
+*/
+extern void DACC_Initialize( Dacc* pDACC,
+ uint8_t idDACC,
+ uint8_t trgEn,
+ uint8_t trgSel,
+ uint8_t word,
+ uint8_t sleepMode,
+ uint32_t mck,
+ uint8_t refresh, /* refresh period */
+ uint8_t user_sel, /* user channel selection */
+ uint32_t tag_mode, /* using tag for channel number */
+ uint32_t startup
+ )
+{
+ /* Stop warning */
+ mck = mck;
+
+ /* Enable peripheral clock*/
+ PMC->PMC_PCER0 = 1 << idDACC;
+
+ /* Reset the controller */
+ DACC_SoftReset(pDACC);
+
+ /* Write to the MR register */
+ DACC_CfgModeReg( pDACC,
+ ( trgEn & DACC_MR_TRGEN)
+ | DACC_MR_TRGSEL(trgSel)
+ | ( word & DACC_MR_WORD)
+ | ( sleepMode & DACC_MR_SLEEP)
+ | DACC_MR_REFRESH(refresh)
+ | ( user_sel & DACC_MR_USER_SEL_Msk)
+ | ( tag_mode & DACC_MR_TAG)
+ | ( startup & DACC_MR_STARTUP_Msk));
+}
+
+
+/**
+ * Set the Conversion Data
+ * \param pDACC Pointer to an Dacc instance.
+ * \param data date to be converted.
+ */
+extern void DACC_SetConversionData( Dacc* pDACC, uint32_t dwData )
+{
+ uint32_t dwMR = pDACC->DACC_MR ;
+
+ if ( dwMR & DACC_MR_WORD )
+ {
+ pDACC->DACC_CDR = dwData ;
+ }
+ else
+ {
+ pDACC->DACC_CDR = (dwData&0xFFFF) ;
+ }
+}
+
+
+/**
+ * \brief Write converted data through PDC channel
+ * \param pDACC the pointer of DACC peripheral
+ * \param pBuffer the destination buffer
+ * \param size the size of the buffer
+*/
+extern uint32_t DACC_WriteBuffer( Dacc* pDACC, uint16_t *pwBuffer, uint32_t dwSize )
+{
+
+ /* Check if the first PDC bank is free*/
+ if ( (pDACC->DACC_TCR == 0) && (pDACC->DACC_TNCR == 0) )
+ {
+ pDACC->DACC_TPR = (uint32_t)pwBuffer ;
+ pDACC->DACC_TCR = dwSize ;
+ pDACC->DACC_PTCR = DACC_PTCR_TXTEN ;
+
+ return 1 ;
+ }
+ /* Check if the second PDC bank is free*/
+ else
+ {
+ if (pDACC->DACC_TNCR == 0)
+ {
+ pDACC->DACC_TNPR = (uint32_t)pwBuffer ;
+ pDACC->DACC_TNCR = dwSize ;
+
+ return 1 ;
+ }
+ else
+ {
+ return 0 ;
+ }
+ }
+
+}
+
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