686 lines
19 KiB
C
686 lines
19 KiB
C
/******************************************************************************
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* drivers/wireless/spirit/lib/spirit_spi.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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******************************************************************************/
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/******************************************************************************
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* Included Files
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******************************************************************************/
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#include <stdio.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/clock.h>
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#include <nuttx/spi/spi.h>
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#include "spirit_regs.h"
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#include "spirit_types.h"
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#include "spirit_spi.h"
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/******************************************************************************
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* Pre-processor Definitions
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******************************************************************************/
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#ifndef CONFIG_WL_SPIRIT_SPIFREQUENCY
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# define CONFIG_WL_SPIRIT_SPIFREQUENCY (10000000)
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#endif
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/******************************************************************************
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* Private Functions
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******************************************************************************/
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/******************************************************************************
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* Name: spirit_dump_buffer
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*
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* Description:
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* Dump a data buffer to the SYSLOG.
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*
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* Input Parameters:
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* buffer - The buffer to be dumped
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* buflen - The length of the buffer in bytes.
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*
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* Returned Value:
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* None
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*
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******************************************************************************/
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#if defined(CONFIG_WL_SPIRIT_REGDEBUG) || defined(CONFIG_WL_SPIRIT_FIFODUMP)
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static void spirit_dump_buffer(FAR const uint8_t *buffer, unsigned int buflen)
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{
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char outbuf[16 * 3 + 3]; /* 16 hex bytes + 2 space separator + NUL termination */
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FAR char *ptr;
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unsigned int i;
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unsigned int j;
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unsigned int maxj;
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for (i = 0; i < buflen; i += 16)
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{
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maxj = 16;
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if (i + maxj > buflen)
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{
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maxj = buflen - i;
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}
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ptr = outbuf;
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for (j = 0; j < maxj; j++)
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{
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if (j == 8)
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{
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*ptr++ = ' ';
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*ptr++ = ' ';
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}
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snprintf(ptr, sizeof(outbuf) - (ptr - outbuf), "%02x ", *buffer++);
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ptr += 3;
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}
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*ptr = '\0';
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wlinfo(" %s\n", ptr);
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}
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}
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#endif
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/******************************************************************************
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* Name: spirit_regdebug
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*
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* Description:
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* Dump a register access.
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*
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* Input Parameters:
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* msg - Describes the access
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* header - Two byte header before the access
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* buffer - The buffer to be dumped
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* buflen - The length of the buffer in bytes.
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*
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* Returned Value:
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* None
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*
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******************************************************************************/
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#ifdef CONFIG_WL_SPIRIT_REGDEBUG
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static void spirit_regdebug(FAR const char *msg, FAR uint8_t *header,
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FAR const uint8_t *buffer, unsigned int buflen)
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{
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wlinfo("%-8s: %02x %02x\n", header[0], header[1]);
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spirit_dump_buffer(buffer, buflen);
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}
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#else
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# define spirit_regdebug(msg,header,buffer,buflen)
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#endif
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/******************************************************************************
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* Name: spirit_fifodebug
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*
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* Description:
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* Dump a FIFO access.
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*
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* Input Parameters:
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* msg - Describes the access
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* header - Two byte header before the access
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* buffer - The buffer to be dumped
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* buflen - The length of the buffer in bytes.
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*
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* Returned Value:
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* None
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*
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******************************************************************************/
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#ifdef CONFIG_WL_SPIRIT_FIFODUMP
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static void spirit_fifodebug(FAR const char *msg, FAR uint8_t *header,
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FAR const uint8_t *buffer, unsigned int buflen)
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{
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wlinfo("%-8s: %02x %02x\n", header[0], header[1]);
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spirit_dump_buffer(buffer, buflen);
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}
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#else
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# define spirit_fifodebug(msg,header,buffer,buflen)
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#endif
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/******************************************************************************
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* Name: spirit_lock
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*
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* Description:
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* Lock the SPI bus before each transfer, setting the correct SPI
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* characteristics for the Spirit device. These must be set if there are
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* multiple devices on the bus because while the bus was unlocked, another
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* device may have re-configured the SPIO.
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*
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* Input Parameters:
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* spi - Reference to the SPI driver structure
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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*
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******************************************************************************/
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static void spirit_lock(FAR struct spi_dev_s *spi)
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{
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/* Lock the SPI bus because there are multiple devices competing for the
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* SPI bus
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*/
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SPI_LOCK(spi, true);
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/* We have the lock. Now make sure that the SPI bus is configured for the
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* Spirit (it might have gotten configured for a different device while
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* unlocked)
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*
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* NOTES:
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* - The SPIRIT1 SPI is mode 0 (CPOL=0, CPHA=0)
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* - Data word is 8-bits
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* - Maximum clock frequency is 10MHz
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* - Transfers are MS bit first
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*/
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SPI_SETMODE(spi, SPIDEV_MODE0);
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SPI_SETBITS(spi, 8);
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SPI_HWFEATURES(spi, 0);
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SPI_SETFREQUENCY(spi, CONFIG_WL_SPIRIT_SPIFREQUENCY);
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}
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/******************************************************************************
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* Name: spirit_unlock
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*
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* Description:
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* Un-lock the SPI bus after each transfer, possibly losing the current
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* configuration if we are sharing the SPI bus with other devices.
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*
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* Input Parameters:
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* spi - Reference to the SPI driver structure
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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*
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******************************************************************************/
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static void spirit_unlock(FAR struct spi_dev_s *spi)
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{
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/* Relinquish the SPI bus. */
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SPI_LOCK(spi, false);
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}
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/******************************************************************************
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* Public Functions
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******************************************************************************/
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/******************************************************************************
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* Name: spirit_reg_read
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*
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* Description:
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* Read single or multiple SPIRIT1 register
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*
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* Input Parameters:
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*
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* regaddr: Base register's address to be read
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* buffer: Pointer to the buffer of registers' values to be read
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* buflen: Number of register values to be read
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*
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* Returned Value:
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* Zero (OK) is returned on success. A negated errno value is returned on
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* any failure. On success, spirit->state is updated.
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*
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******************************************************************************/
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int spirit_reg_read(FAR struct spirit_library_s *spirit, uint8_t regaddr,
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FAR uint8_t *buffer, unsigned int buflen)
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{
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uint8_t header[2];
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uint8_t status[2];
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/* Setup the header bytes */
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header[0] = READ_HEADER;
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header[1] = regaddr;
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/* Lock the SPI bus and select the Spirit device */
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spirit_lock(spirit->spi);
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SPI_SELECT(spirit->spi, SPIDEV_WIRELESS(0), true);
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/* Write the header bytes and read the SPIRIT1 status bytes */
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SPI_EXCHANGE(spirit->spi, header, status, 2);
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/* Update Spirit status. 16-bit status is returned MS byte first */
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spirit->u.u16 = ((uint16_t)status[0] << 8) | (uint16_t)status[1];
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/* Read the register values */
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SPI_RECVBLOCK(spirit->spi, buffer, buflen);
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/* Deselect the Spirit device and return the result */
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SPI_SELECT(spirit->spi, SPIDEV_WIRELESS(0), false);
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spirit_unlock(spirit->spi);
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spirit_regdebug("READ", header, buffer, buflen);
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return OK;
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}
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/******************************************************************************
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* Name: spirit_reg_write
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*
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* Description:
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* Read single or multiple SPIRIT1 register.
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*
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* Input Parameters:
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* spirit - Reference to an instance of the driver state structure.
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* regaddr - Base register's address to write
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* buffer - Pointer to the buffer of register values to write
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* buflen - Number of registers values to be written.
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*
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* Returned Value:
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* Zero (OK) is returned on success. A negated errno value is returned on
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* any failure. On success, spirit->state is updated.
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*
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******************************************************************************/
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int spirit_reg_write(FAR struct spirit_library_s *spirit, uint8_t regaddr,
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FAR const uint8_t *buffer, unsigned int buflen)
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{
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uint8_t header[2];
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uint8_t status[2];
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/* Setup the header bytes */
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header[0] = WRITE_HEADER;
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header[1] = regaddr;
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spirit_regdebug("WRITE", header, buffer, buflen);
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/* Lock the SPI bus and select the Spirit device */
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spirit_lock(spirit->spi);
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SPI_SELECT(spirit->spi, SPIDEV_WIRELESS(0), true);
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/* Write the header bytes and read the SPIRIT1 status bytes */
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SPI_EXCHANGE(spirit->spi, header, status, 2);
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/* Update Spirit status. 16-bit status is returned MS byte first */
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spirit->u.u16 = ((uint16_t)status[0] << 8) | (uint16_t)status[1];
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/* Write the register values */
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SPI_SNDBLOCK(spirit->spi, buffer, buflen);
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/* Deselect the Spirit device and return the result */
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SPI_SELECT(spirit->spi, SPIDEV_WIRELESS(0), false);
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spirit_unlock(spirit->spi);
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return OK;
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}
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/******************************************************************************
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* Name: spirit_reg_modify
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*
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* Description:
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* Perform atomic read/modify/write on a single SPIRIT1 register.
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*
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* Input Parameters:
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* spirit - Reference to an instance of the driver state structure.
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* regaddr - Base register's address to write
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* clrbits - Bits to clear in the register
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* setbits - Bits to set in the register
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*
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* Returned Value:
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* Zero (OK) is returned on success. A negated errno value is returned on
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* any failure. On success, spirit->state is updated.
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*
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******************************************************************************/
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int spirit_reg_modify(FAR struct spirit_library_s *spirit, uint8_t regaddr,
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uint8_t setbits, uint8_t clrbits)
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{
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uint8_t header[2];
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uint8_t status[2];
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uint8_t regval;
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/* Setup the header byte to read the register */
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header[0] = READ_HEADER;
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header[1] = regaddr;
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/* Lock the SPI bus and select the Spirit device */
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spirit_lock(spirit->spi);
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SPI_SELECT(spirit->spi, SPIDEV_WIRELESS(0), true);
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/* Write the header bytes (ignoring the returned SPIRIT1 status bytes) */
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SPI_SNDBLOCK(spirit->spi, header, 2);
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/* Read the register value */
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regval = SPI_SEND(spirit->spi, 0xff);
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spirit_regdebug("READ", header, ®val, 1);
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/* Modify the register value */
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regval &= ~clrbits;
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regval |= setbits;
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/* Setup the header byte for the write operation */
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header[0] = WRITE_HEADER;
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header[1] = regaddr;
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spirit_regdebug("WRITE", header, ®val, 1);
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/* Toggle Chip select so that we get the correct status */
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SPI_SELECT(spirit->spi, SPIDEV_WIRELESS(0), false);
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SPI_SELECT(spirit->spi, SPIDEV_WIRELESS(0), true);
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/* Write the header bytes and read the SPIRIT1 status bytes */
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SPI_EXCHANGE(spirit->spi, header, status, 2);
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/* Update Spirit status. 16-bit status is returned MS byte first */
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spirit->u.u16 = ((uint16_t)status[0] << 8) | (uint16_t)status[1];
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/* Write the register value */
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SPI_SEND(spirit->spi, regval);
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/* Deselect the Spirit device and return the result */
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SPI_SELECT(spirit->spi, SPIDEV_WIRELESS(0), false);
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spirit_unlock(spirit->spi);
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return OK;
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}
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/******************************************************************************
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* Name: spirit_command
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*
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* Description:
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* Send a command
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*
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* Input Parameters:
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* spirit - Reference to an instance of the driver state structure.
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* cmd - Command code to be sent
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*
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* Returned Value:
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* Zero (OK) is returned on success. A negated errno value is returned on
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* any failure. On success, spirit->state is updated.
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*
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******************************************************************************/
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int spirit_command(FAR struct spirit_library_s *spirit, uint8_t cmd)
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{
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uint8_t header[2];
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uint8_t status[2];
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/* Setup the header bytes */
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header[0] = COMMAND_HEADER;
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header[1] = cmd;
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spirit_regdebug("CMD", header, NULL, 0);
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/* Lock the SPI bus and select the Spirit device */
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spirit_lock(spirit->spi);
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SPI_SELECT(spirit->spi, SPIDEV_WIRELESS(0), true);
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/* Write the header bytes and read the SPIRIT1 status bytes */
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SPI_EXCHANGE(spirit->spi, header, status, 2);
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/* Update Spirit status. 16-bit status is returned MS byte first */
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spirit->u.u16 = ((uint16_t)status[0] << 8) | (uint16_t)status[1];
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/* Deselect the Spirit device and return the result */
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SPI_SELECT(spirit->spi, SPIDEV_WIRELESS(0), false);
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spirit_unlock(spirit->spi);
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return OK;
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}
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/******************************************************************************
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* Name: spirit_fifo_read
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*
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* Description:
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* Read data from RX FIFO
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*
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* Input Parameters:
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* spirit - Reference to an instance of the driver state structure.
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* buffer - Pointer to the buffer of data values to write
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* buflen - Number of bytes to be written
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*
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* Returned Value:
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* Zero (OK) is returned on success. A negated errno value is returned on
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* any failure. On success, spirit->state is updated.
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*
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******************************************************************************/
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int spirit_fifo_read(FAR struct spirit_library_s *spirit, FAR uint8_t *buffer,
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unsigned int buflen)
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{
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uint8_t header[2];
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uint8_t status[2];
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/* Setup the header bytes */
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header[0] = READ_HEADER;
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header[1] = LINEAR_FIFO_ADDRESS;
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/* Lock the SPI bus and select the Spirit device */
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spirit_lock(spirit->spi);
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SPI_SELECT(spirit->spi, SPIDEV_WIRELESS(0), true);
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/* Write the header bytes and read the SPIRIT1 status bytes */
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SPI_EXCHANGE(spirit->spi, header, status, 2);
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/* Update Spirit status. 16-bit status is returned MS byte first */
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spirit->u.u16 = ((uint16_t)status[0] << 8) | (uint16_t)status[1];
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/* Read the register values */
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SPI_RECVBLOCK(spirit->spi, buffer, buflen);
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/* Deselect the Spirit device and return the result */
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SPI_SELECT(spirit->spi, SPIDEV_WIRELESS(0), false);
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spirit_unlock(spirit->spi);
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spirit_fifodebug("FIFO IN", header, buffer, buflen);
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return OK;
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}
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/******************************************************************************
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* Name: spirit_fifo_write
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*
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* Description:
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* Write data into TX FIFO.
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*
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* Input Parameters:
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* spirit - Reference to an instance of the driver state structure.
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* buffer - Pointer to the buffer of data values to write
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* buflen - Number of data values to be written.
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*
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* Returned Value:
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* Zero (OK) is returned on success. A negated errno value is returned on
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* any failure. On success, spirit->state is updated.
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*
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******************************************************************************/
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int spirit_fifo_write(FAR struct spirit_library_s *spirit,
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FAR const uint8_t *buffer, unsigned int buflen)
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{
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uint8_t header[2];
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uint8_t status[2];
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/* Setup the header bytes */
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header[0] = WRITE_HEADER;
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header[1] = LINEAR_FIFO_ADDRESS;
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spirit_fifodebug("FIFO OUT", header, buffer, buflen);
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/* Lock the SPI bus and select the Spirit device */
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spirit_lock(spirit->spi);
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SPI_SELECT(spirit->spi, SPIDEV_WIRELESS(0), true);
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/* Write the header bytes and read the SPIRIT1 status bytes */
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SPI_EXCHANGE(spirit->spi, header, status, 2);
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/* Update Spirit status. 16-bit status is returned MS byte first */
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spirit->u.u16 = ((uint16_t)status[0] << 8) | (uint16_t)status[1];
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/* Write the fifo values */
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SPI_SNDBLOCK(spirit->spi, buffer, buflen);
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/* Deselect the Spirit device and return the result */
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SPI_SELECT(spirit->spi, SPIDEV_WIRELESS(0), false);
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spirit_unlock(spirit->spi);
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|
return OK;
|
|
}
|
|
|
|
/******************************************************************************
|
|
* Name: spirit_update_status
|
|
*
|
|
* Description:
|
|
* Updates the state field in the driver instance, reading the MC_STATE
|
|
* register of SPIRIT.
|
|
*
|
|
* Input Parameters:
|
|
* spirit - Reference to an instance of the driver state structure.
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) is returned on success. A negated errno value is returned on
|
|
* any failure. On success, spirit->state is updated.
|
|
*
|
|
******************************************************************************/
|
|
|
|
int spirit_update_status(FAR struct spirit_library_s *spirit)
|
|
{
|
|
uint8_t regval;
|
|
|
|
DEBUGASSERT(spirit != NULL);
|
|
|
|
/* Reads the MC_STATUS register to update the spirit->state */
|
|
|
|
return spirit_reg_read(spirit, MC_STATE1_BASE, ®val, 1);
|
|
}
|
|
|
|
/******************************************************************************
|
|
* Name: spirit_waitstatus
|
|
*
|
|
* Description:
|
|
* Poll until the Spirit status is the requested value or until a timeout
|
|
* occurs.
|
|
*
|
|
* Input Parameters:
|
|
* spirit - Reference to a Spirit library state structure instance
|
|
* state - That that we are waiting for.
|
|
* msec - Timeout in millisedonds
|
|
*
|
|
* Returned Value:
|
|
* OK on success; a negated errno on a timeout
|
|
*
|
|
* Assumptions:
|
|
* We have exclusive access to the driver state and to the spirit library.
|
|
*
|
|
******************************************************************************/
|
|
|
|
int spirit_waitstatus(FAR struct spirit_library_s *spirit,
|
|
enum spirit_state_e state, unsigned int msec)
|
|
{
|
|
clock_t start;
|
|
clock_t ticks;
|
|
clock_t elapsed;
|
|
int ret;
|
|
|
|
#ifdef CONFIG_DEBUG_SPI_INFO
|
|
/* If the SPI logic is generating debug output, then a longer timeout is
|
|
* probably needed.
|
|
*/
|
|
|
|
msec <<= 4;
|
|
#endif
|
|
|
|
/* Convert the MSEC timedelay to clock ticks, making sure that the
|
|
* resulting delay in ticks is greater than or equal to the requested time
|
|
* in MSEC.
|
|
*
|
|
* REVISIT: If USEC_PER_TICK and 'msec' are large, then the second
|
|
* computation may overflow!
|
|
*/
|
|
|
|
#if (MSEC_PER_TICK * USEC_PER_MSEC) == USEC_PER_TICK
|
|
ticks = (msec + (MSEC_PER_TICK - 1)) / MSEC_PER_TICK;
|
|
#else
|
|
ticks = ((clock_t)msec * USEC_PER_MSEC + (USEC_PER_TICK - 1)) /
|
|
USEC_PER_TICK;
|
|
#endif
|
|
|
|
/* The time that we started the wait */
|
|
|
|
start = clock_systime_ticks();
|
|
|
|
/* Loop until the status change occurs (or the wait times out) */
|
|
|
|
do
|
|
{
|
|
ret = spirit_update_status(spirit);
|
|
if (ret < 0)
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
elapsed = clock_systime_ticks() - start;
|
|
}
|
|
while (spirit->u.state.MC_STATE != state && elapsed <= ticks);
|
|
|
|
if (spirit->u.state.MC_STATE == state)
|
|
{
|
|
return OK;
|
|
}
|
|
|
|
/* This is probably not an error. In a busy radio environment, there
|
|
* are many race conditions. Most typically, just when the driver is
|
|
* setting up to perform a transmission, the hardware commits to a
|
|
* reception. The symptom is that the the above loop times out out
|
|
* waiting to go into the TX state (because it is in the RX state).
|
|
*
|
|
* Complaining with too much debug output just aggravates the problem.
|
|
*/
|
|
|
|
wlinfo("Timed out: %lu > %lu (%u msec)\n",
|
|
(unsigned long)elapsed, (unsigned long)ticks, msec);
|
|
wlinfo("with MC status: current=%02x desired=%02x\n",
|
|
spirit->u.state.MC_STATE, state);
|
|
return -ETIMEDOUT;
|
|
}
|