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/*******************************************************************************
* Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name of Maxim Integrated
* Products, Inc. shall not be used except as stated in the Maxim Integrated
* Products, Inc. Branding Policy.
*
* The mere transfer of this software does not imply any licenses
* of trade secrets, proprietary technology, copyrights, patents,
* trademarks, maskwork rights, or any other form of intellectual
* property whatsoever. Maxim Integrated Products, Inc. retains all
* ownership rights.
*
* $Date: 2018-09-04 22:13:32 +0000 (Tue, 04 Sep 2018) $
* $Revision: 37649 $
*
******************************************************************************/
/**
* @file main.c
* @brief Hello World!
* @details This example uses the UART to print to a terminal and flashes an LED.
*/
/***** Includes *****/
#include <stdio.h>
#include <stdint.h>
#include "mxc_config.h"
#include "led.h"
#include "board.h"
#include "tmr_utils.h"
#include "i2c.h"
#include "rtc.h"
#include "spi.h"
#include "MAX30003.h"
/***** Definitions *****/
#define I2C_DEVICE MXC_I2C0_BUS0
#define SPI SPI0
#define SPI_SPEED 10000000 // Bit Rate
/***** Globals *****/
/***** Functions *****/
#if 0
void I2C0_IRQHandler(void)
{
I2C_Handler(I2C_DEVICE);
return;}
#endif
uint32_t ecg_read_reg(uint8_t reg)
{
spi_req_t req;
uint8_t tx_data[] = {(reg << 1) | 1, 0, 0, 0};
uint8_t rx_data[] = {0, 0, 0, 0};
req.tx_data = tx_data;
req.rx_data = rx_data;
req.len = 4;
req.bits = 8;
req.width = SPI17Y_WIDTH_1;
req.ssel = 0;
req.deass = 1;
req.ssel_pol = SPI17Y_POL_LOW;
req.tx_num = 0;
req.rx_num = 0;
SPI_MasterTrans(SPI, &req);
return (rx_data[1] << 16) | (rx_data[2] << 8) | rx_data[3];
}
void ecg_write_reg(uint8_t reg, uint32_t data)
{
printf("write %02x %06x\n", reg, data);
spi_req_t req;
uint8_t tx_data[] = {(reg << 1) | 0 , data >> 16, (data >> 8 ) & 0xFF, data & 0xFF};
uint8_t rx_data[] = {0, 0, 0, 0};
req.tx_data = tx_data;
req.rx_data = rx_data;
req.len = 4;
req.bits = 8;
req.width = SPI17Y_WIDTH_1;
req.ssel = 0;
req.deass = 1;
req.ssel_pol = SPI17Y_POL_LOW;
req.tx_num = 0;
req.rx_num = 0;
SPI_MasterTrans(SPI, &req);
}
void ecg_config(void)
{
// Reset ECG to clear registers
ecg_write_reg(SW_RST , 0);
// General config register setting
union GeneralConfiguration_u CNFG_GEN_r;
CNFG_GEN_r.bits.en_ecg = 1; // Enable ECG channel
CNFG_GEN_r.bits.rbiasn = 1; // Enable resistive bias on negative input
CNFG_GEN_r.bits.rbiasp = 1; // Enable resistive bias on positive input
CNFG_GEN_r.bits.en_rbias = 1; // Enable resistive bias
CNFG_GEN_r.bits.imag = 2; // Current magnitude = 10nA
CNFG_GEN_r.bits.en_dcloff = 1; // Enable DC lead-off detection
ecg_write_reg(CNFG_GEN , CNFG_GEN_r.all);
// ECG Config register setting
union ECGConfiguration_u CNFG_ECG_r;
CNFG_ECG_r.bits.dlpf = 1; // Digital LPF cutoff = 40Hz
CNFG_ECG_r.bits.dhpf = 1; // Digital HPF cutoff = 0.5Hz
//CNFG_ECG_r.bits.gain = 3; // ECG gain = 160V/V
CNFG_ECG_r.bits.gain = 0;
CNFG_ECG_r.bits.rate = 2; // Sample rate = 128 sps
ecg_write_reg(CNFG_ECG , CNFG_ECG_r.all);
//R-to-R configuration
union RtoR1Configuration_u CNFG_RTOR_r;
CNFG_RTOR_r.bits.en_rtor = 1; // Enable R-to-R detection
ecg_write_reg(CNFG_RTOR1 , CNFG_RTOR_r.all);
//Manage interrupts register setting
union ManageInterrupts_u MNG_INT_r;
MNG_INT_r.bits.efit = 0b00011; // Assert EINT w/ 4 unread samples
MNG_INT_r.bits.clr_rrint = 0b01; // Clear R-to-R on RTOR reg. read back
ecg_write_reg(MNGR_INT , MNG_INT_r.all);
//Enable interrupts register setting
union EnableInterrupts_u EN_INT_r;
EN_INT_r.all = 0;
EN_INT_r.bits.en_eint = 1; // Enable EINT interrupt
EN_INT_r.bits.en_rrint = 0; // Disable R-to-R interrupt
EN_INT_r.bits.intb_type = 3; // Open-drain NMOS with internal pullup
ecg_write_reg(EN_INT , EN_INT_r.all);
//Dyanmic modes config
union ManageDynamicModes_u MNG_DYN_r;
MNG_DYN_r.bits.fast = 0; // Fast recovery mode disabled
ecg_write_reg(MNGR_DYN , MNG_DYN_r.all);
// MUX Config
union MuxConfiguration_u CNFG_MUX_r;
CNFG_MUX_r.bits.openn = 0; // Connect ECGN to AFE channel
CNFG_MUX_r.bits.openp = 0; // Connect ECGP to AFE channel
ecg_write_reg(CNFG_EMUX , CNFG_MUX_r.all);
return;
}
// *****************************************************************************
int main(void)
{
//int count = 0;
printf("Hello World!\n");
//Setup the I2CM
I2C_Shutdown(I2C_DEVICE);
I2C_Init(I2C_DEVICE, I2C_FAST_MODE, NULL);
#if 0
NVIC_EnableIRQ(I2C0_IRQn); // Not sure if we actually need this when not doing async requests
#endif
uint8_t dummy[1] = {0};
// "7-bit addresses 0b0000xxx and 0b1111xxx are reserved"
for (int addr = 0x8; addr < 0x78; ++addr) {
// A 0 byte write does not seem to work so always send a single byte.
int res = I2C_MasterWrite(I2C_DEVICE, addr << 1, dummy, 1, 0);
if(res == 1) {
printf("Found (7 bit) address 0x%02x\n", addr);
}
}
// Enable 32 kHz output
//RTC_SquareWave(MXC_RTC, SQUARE_WAVE_ENABLED, F_32KHZ, NOISE_IMMUNE_MODE, NULL);
// Enable SPI
sys_cfg_spi_t spi17y_master_cfg;
spi17y_master_cfg.map = MAP_A;
spi17y_master_cfg.ss0 = Enable;
spi17y_master_cfg.ss1 = Disable;
spi17y_master_cfg.ss2 = Disable;
if (SPI_Init(SPI, 0, SPI_SPEED, spi17y_master_cfg) != 0) {
printf("Error configuring SPI\n");
while (1);
}
for(int i=0; i<0x20; i++) {
uint32_t val = ecg_read_reg(i);
printf("%02x: 0x%06x\n", i, val);
}
ecg_config();
for(int i=0; i<0x20; i++) {
uint32_t val = ecg_read_reg(i);
printf("%02x: 0x%06x\n", i, val);
}
while (0) {
LED_On(0);
TMR_Delay(MXC_TMR0, MSEC(500), 0);
LED_Off(0);
TMR_Delay(MXC_TMR0, MSEC(500), 0);
//printf("count = %d\n", count++);
}
ecg_write_reg(SYNCH, 0);
uint32_t ecgFIFO, readECGSamples, idx, ETAG[32], status;
int16_t ecgSample[32];
const int EINT_STATUS_MASK = 1 << 23;
const int FIFO_OVF_MASK = 0x7;
const int FIFO_VALID_SAMPLE_MASK = 0x0;
const int FIFO_FAST_SAMPLE_MASK = 0x1;
const int ETAG_BITS_MASK = 0x7;
uint8_t ecgFIFOIntFlag = 0;
const gpio_cfg_t interrupt_pin = {PORT_1, PIN_12, GPIO_FUNC_IN, GPIO_PAD_PULL_UP};
GPIO_Config(&interrupt_pin);
while(1) {
#if 1
if(GPIO_InGet(&interrupt_pin) == 0) {
ecgFIFOIntFlag = 1;
}
// Read back ECG samples from the FIFO
if( ecgFIFOIntFlag ) {
ecgFIFOIntFlag = 0;
//printf("Int\n");
status = ecg_read_reg( STATUS ); // Read the STATUS register
// Check if EINT interrupt asserted
if ( ( status & EINT_STATUS_MASK ) == EINT_STATUS_MASK ) {
readECGSamples = 0; // Reset sample counter
do {
ecgFIFO = ecg_read_reg(ECG_FIFO ); // Read FIFO
ecgSample[readECGSamples] = ecgFIFO >> 8; // Isolate voltage data
ETAG[readECGSamples] = ( ecgFIFO >> 3 ) & ETAG_BITS_MASK; // Isolate ETAG
readECGSamples++; // Increment sample counter
// Check that sample is not last sample in FIFO
} while ( ETAG[readECGSamples-1] == FIFO_VALID_SAMPLE_MASK ||
ETAG[readECGSamples-1] == FIFO_FAST_SAMPLE_MASK );
// Check if FIFO has overflowed
if( ETAG[readECGSamples - 1] == FIFO_OVF_MASK ){
ecg_write_reg(FIFO_RST , 0); // Reset FIFO
//printf("OV\n");
LED_On(0);
//rLed = 1;//notifies the user that an over flow occured
}
// Print results
for( idx = 0; idx < readECGSamples; idx++ ) {
printf("%6d\r\n", ecgSample[idx]);
}
}
}
#endif
}
}