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spimaster.c
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spimaster.c
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/*
* Copyright (c) 2018, Texas Instruments Incorporated
* 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 following disclaimer.
*
* * 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.
*
* * Neither the name of Texas Instruments Incorporated nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS 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.
*/
/*
* ======== spimaster.c ========
*/
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
/* POSIX Header files */
#include <pthread.h>
#include <unistd.h>
/* Driver Header files */
#include <ti/drivers/SPI.h>
/* Example/Board Header files */
#include "Board.h"
#define THREADSTACKSIZE (1024)
#define SPI_MSG_LENGTH (64)
#define MAX_LOOP (10)
// TLC5973 SDI pin is connected with a mosfet to SPI port, high on SPI port is low on TLC5973
#define ONE 0b0101
#define ZERO 0b0111
#define NONE 0b1111
/*
// TLC5973 message: GSLAT, 0x3AA, 0xFFF, 0xFFF, 0xFFF, GSLAT (white)
unsigned char masterTxBuffer[] = { NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE, // GSLAT
ZERO, ZERO, ONE, ONE, ONE, ZERO, ONE, ZERO, ONE, ZERO, ONE, ZERO, //0x3AA 0b001110101010
ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, //0xFFF OUT0
ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, //0xFFF OUT1
ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, //0xFFF OUT2
NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE, // GSLAT
};
*/
/*
// TLC5973 message: GSLAT, 0x3AA, 0xFFF, 0x000, 0x000, GSLAT (blue)
unsigned char masterTxBuffer[] = { NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE, // GSLAT
ZERO, ZERO, ONE, ONE, ONE, ZERO, ONE, ZERO, ONE, ZERO, ONE, ZERO, //0x3AA 0b001110101010
ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, //0xFFF OUT0
ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, //0x000 OUT1
ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, //0x000 OUT2
NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE, // GSLAT
};
*/
/*
// TLC5973 message: GSLAT, 0x3AA, 0x000, 0xFFF, 0x000, GSLAT (green)
unsigned char masterTxBuffer[] = { NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE, // GSLAT
ZERO, ZERO, ONE, ONE, ONE, ZERO, ONE, ZERO, ONE, ZERO, ONE, ZERO, //0x3AA 0b001110101010
ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, //0x000 OUT0
ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, //0xFFF OUT1
ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, //0x000 OUT1
NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE, // GSLAT
};
*/
/*
// TLC5973 message: GSLAT, 0x3AA, 0x000, 0x000, 0xFFF, GSLAT (red)
unsigned char masterTxBuffer[] = { NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE, // GSLAT
ZERO, ZERO, ONE, ONE, ONE, ZERO, ONE, ZERO, ONE, ZERO, ONE, ZERO, //0x3AA 0b001110101010
ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, //0x000 OUT0
ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, //0x000 OUT1
ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ONE, ON, //0xFFF OUT2
NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE, // GSLAT
};
*/
// TLC5973 message: GSLAT, 0x3AA, 0x000, 0x000, 0x000, GSLAT (all off)
unsigned char masterTxBuffer[] = { NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE, // GSLAT
ZERO, ZERO, ONE, ONE, ONE, ZERO, ONE, ZERO, ONE, ZERO, ONE, ZERO, //0x3AA 0b001110101010
ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, //0x000 OUT0
ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, //0x000 OUT1
ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, ZERO, //0x000 OUT2
NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE, // GSLAT
};
unsigned char masterRxBuffer[SPI_MSG_LENGTH];
// Animate TLC5973 by cycling all channels from 0-4096 to create a breathing effect.
unsigned short grayscale = 0;
int operand = 1;
void updateTxBuffer () {
grayscale = grayscale + operand;
if (grayscale >= 4096) {
grayscale = 4096;
operand = -1;
}
if (grayscale <= 0) {
grayscale = 0;
operand = 1;
}
int i;
unsigned short word = grayscale;
for(i = 0; i < 12; i++) {
if (word & 0x0800) {
masterTxBuffer[20+i] = ONE; // Blue
masterTxBuffer[32+i] = ONE; // Green
masterTxBuffer[44+i] = ONE; // Red
} else {
masterTxBuffer[20+i] = ZERO; // Blue
masterTxBuffer[32+i] = ZERO; // Green
masterTxBuffer[44+i] = ZERO; // Red
}
word <<= 1;
}
return;
}
/*
* ======== masterThread ========
* Master SPI sends a message to slave while simultaneously receiving a
* message from the slave.
*/
void *masterThread(void *arg0)
{
SPI_Handle masterSpi;
SPI_Params spiParams;
SPI_Transaction transaction;
bool transferOK;
/* Open SPI as master (default) */
SPI_Params_init(&spiParams);
spiParams.frameFormat = SPI_TI;
spiParams.bitRate = 1000000; // fails around 3 Mbps
spiParams.dataSize = 4;
masterSpi = SPI_open(Board_SPI_MASTER, &spiParams);
if (masterSpi == NULL) {
printf("Error initializing master SPI\n");
while (1);
}
else {
printf("Master SPI initialized\n");
}
while (1) {
updateTxBuffer();
usleep(500);
/* Initialize master SPI transaction structure */
transaction.count = SPI_MSG_LENGTH;
transaction.txBuf = (void *) masterTxBuffer;
transaction.rxBuf = (void *) masterRxBuffer;
/* Perform SPI transfer */
transferOK = SPI_transfer(masterSpi, &transaction);
if (!transferOK) {
printf("Unsuccessful master SPI transfer");
}
}
SPI_close(masterSpi);
printf("Done\n");
return (NULL);
}
/*
* ======== mainThread ========
*/
void *mainThread(void *arg0)
{
pthread_t thread0;
pthread_attr_t attrs;
struct sched_param priParam;
int retc;
int detachState;
/* Call driver init functions. */
SPI_init();
printf("Starting the SPI master example");
printf("This example requires external wires to be "
"connected to the header pins. Please see the Board.html for details.\n");
/* Create application threads */
pthread_attr_init(&attrs);
detachState = PTHREAD_CREATE_DETACHED;
/* Set priority and stack size attributes */
retc = pthread_attr_setdetachstate(&attrs, detachState);
if (retc != 0) {
/* pthread_attr_setdetachstate() failed */
while (1);
}
retc |= pthread_attr_setstacksize(&attrs, THREADSTACKSIZE);
if (retc != 0) {
/* pthread_attr_setstacksize() failed */
while (1);
}
/* Create master thread */
priParam.sched_priority = 1;
pthread_attr_setschedparam(&attrs, &priParam);
retc = pthread_create(&thread0, &attrs, masterThread, NULL);
if (retc != 0) {
/* pthread_create() failed */
while (1);
}
return (NULL);
}