Reincarnate the sensinode/cc2430 port
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George Oikonomou
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114 changed files with 10044 additions and 3068 deletions
186
platform/sensinode/dev/n740.c
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186
platform/sensinode/dev/n740.c
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/*
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* Copyright (c) 2010, Loughborough University - Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*/
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/**
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* \file
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* This file provides functions to control various chips on the
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* Sensinode N740s:
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*
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* - The 74HC595D is an 8-bit serial in-parallel out shift register.
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* LEDs are connected to this chip. It also serves other functions such as
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* enabling/disabling the Accelerometer (see n740.h).
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* - The 74HC4053D is a triple, 2-channel analog mux/de-mux.
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* It switches I/O between the USB and the D-Connector.
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* It also controls P0_0 input source (Light Sensor / External I/O)
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*
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* Mux/De-mux: Connected to P0_3 (set to output in models.c
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* Changing the state of the mux/demux can have catastrophic (tm) results
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* on our software. If we are not careful, we risk entering a state where
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* UART1 RX interrupts are being generated non-stop. Only change its state
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* via the function in this file.
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*
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* Shift Register:
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* For the shift register we can:
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* - write a new instruction
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* - remember and retrieve the last instruction sent
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*
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* The chip is connected to CPU pins as follows:
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* - P0_2: Serial Data Input
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* - P1_3: Shift Register Clock Input
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* - P1_1: Storage Register Clock
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*
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* This file can be placed in any bank.
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*
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* \author
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* George Oikonomou - <oikonomou@users.sourceforge.net>
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*/
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#include "dev/n740.h"
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#include "dev/uart1.h"
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/*
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* This variable stores the most recent instruction sent to the ser-par chip.
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* We declare it as static and return its value through n740_ser_par_get().
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*/
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static __data uint8_t ser_par_status;
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/*---------------------------------------------------------------------------*/
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/* Init the serial-parallel chip:
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* - Set I/O direction for all 3 pins (P0_2, P1_1 and P1_3) to output
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*/
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void
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n740_ser_par_init()
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{
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/* bus_init and uart1_init also touch the I/O direction for those pins */
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P1DIR |= 0x0A;
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P0DIR |= 0x04;
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Send a command to the N740 serial-parallel chip. Each command is a single
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* byte, each bit controls a different feature on the sensor.
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*/
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void
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n740_ser_par_set(uint8_t data)
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{
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uint8_t i;
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uint8_t mask = 1;
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uint8_t temp = 0;
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DISABLE_INTERRUPTS();
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/* bit-by-bit */
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for(i = 0; i < 8; i++) {
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temp = (data & mask);
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/* Is the bit set? */
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if(i && temp) {
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/* If it was set, we want to send 1 */
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temp >>= i;
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}
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/* Send the bit */
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P0_2 = temp;
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/* Shift */
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P1_3 = 1;
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P1_3 = 0;
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mask <<= 1;
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}
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/* Move to Par-Out */
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P1_1 = 1;
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P1_1 = 0;
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ENABLE_INTERRUPTS();
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/* Right, we're done. Save the new status in ser_par_status */
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ser_par_status = data;
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}
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/*---------------------------------------------------------------------------*/
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/* This function returns the last value sent to the ser-par chip on the N740.
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*
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* The caveat here is that we must always use n740_set_ser_par() to send
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* commands to the ser-par chip, never write directly.
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*
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* If any other function sends a command directly, ser_par_status and the
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* actual status will end up out of sync.
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*/
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uint8_t
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n740_ser_par_get()
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{
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return ser_par_status;
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}
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/*---------------------------------------------------------------------------*/
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void
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n740_analog_switch(uint8_t state)
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{
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/* Turn off the UART RX interrupt before switching */
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DISABLE_INTERRUPTS();
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UART1_RX_INT(0);
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/* Switch */
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P0_3 = state;
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/* If P0_3 now points to the USB and nothing is flowing down P1_7,
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* enable the interrupt again */
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if(P1_7 == 1 && P0_3 == N740_ANALOG_SWITCH_USB) {
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UART1_RX_INT(1);
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}
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ENABLE_INTERRUPTS();
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Activate the the 74HC4053D analog switch U5 on the N740 and at the same
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* time set relevant pins to Peripheral I/O mode. This stops communications
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* with the serial flash and enables UART1 I/O
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*/
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void
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n740_analog_activate()
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{
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uint8_t ser_par = n740_ser_par_get();
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ser_par &= ~N740_SER_PAR_U5_ENABLE; /* Turn on */
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N740_PINS_PER_IO();
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n740_ser_par_set(ser_par);
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}
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/*---------------------------------------------------------------------------*/
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/*
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* De-Activate the the 74HC4053D analog switch U5 on the N740 and at the same
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* time set relevant pins to GP I/O mode. This effectively prepares us to
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* start talking with the serial flash chip
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*/
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void
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n740_analog_deactivate()
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{
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uint8_t ser_par = n740_ser_par_get();
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ser_par |= N740_SER_PAR_U5_ENABLE; /* Turn off */
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n740_ser_par_set(ser_par);
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N740_PINS_GPIO();
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}
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/*---------------------------------------------------------------------------*/
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