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MBI5030.cpp
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MBI5030.cpp
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//
// To get a suitably high GSCLK frequency, the CLKO-FUSE of the ATMega168/328 has been programmed
// It will output it's system clock on PB0 ("digital pin" #8)
//
// THIS REQUIRES AN ISP PROGRAMMER (or 2nd Arduino loaded with Arduino-ISP)
//
// Diecimila + ATmega168: lfuse: 0xBF
// hfuse: 0xDD
// efuse: 0x00 (or 0xF8)
//
// Uno + ATmega328: lfuse: 0xBF
// hfuse: 0xDE
// efuse: 0x05 (or 0xFD)
//
// To revert to Arduino's default FUSE settings, change 0xBF to 0xFF.
//
// Use: "http://www.engbedded.com/fusecalc" and ".../arduino-XXX/hardware/arduino/boards.txt"
//
// Make sure to get the latest MBI5030 datasheet (at least version Jan. 2009)!
//
#include <avr/io.h>
#include <stdint.h>
#include <Arduino.h>
#include "MBI5030.h"
MBI5030::MBI5030(uint8_t spi_out_pin, uint8_t spi_in_pin, uint8_t spi_clk_pin,
uint8_t spi_latch_pin)
{
_spi_out_pin = spi_out_pin;
_spi_in_pin = spi_in_pin;
_spi_clk_pin = spi_clk_pin;
_spi_latch_pin = spi_latch_pin;
_spi_out_DIR = portModeRegister(digitalPinToPort(_spi_out_pin));
_spi_out_PORT = portOutputRegister(digitalPinToPort(_spi_out_pin));
_spi_out_pinmask = digitalPinToBitMask(_spi_out_pin);
_spi_in_DIR = portModeRegister(digitalPinToPort(_spi_in_pin));
_spi_in_PIN = portInputRegister(digitalPinToPort(_spi_in_pin));
_spi_in_pinmask = digitalPinToBitMask(_spi_in_pin);
_spi_clk_DIR = portModeRegister(digitalPinToPort(_spi_clk_pin));
_spi_clk_PORT = portOutputRegister(digitalPinToPort(_spi_clk_pin));
_spi_clk_pinmask = digitalPinToBitMask(_spi_clk_pin);
_spi_latch_DIR = portModeRegister(digitalPinToPort(_spi_latch_pin));
_spi_latch_PORT = portOutputRegister(digitalPinToPort(_spi_latch_pin));
_spi_latch_pinmask = digitalPinToBitMask(_spi_latch_pin);
}
void MBI5030::spi_init(void)
{
*_spi_out_DIR |= _spi_out_pinmask;
*_spi_out_PORT &= ~_spi_out_pinmask;
*_spi_in_DIR &= ~_spi_in_pinmask;
*_spi_clk_DIR |= _spi_clk_pinmask;
*_spi_clk_PORT &= ~_spi_clk_pinmask;
*_spi_latch_DIR |= _spi_latch_pinmask;
*_spi_latch_PORT &= ~_spi_latch_pinmask;
}
inline void MBI5030::spi_out_high(void)
{
*_spi_out_PORT |= _spi_out_pinmask;
}
inline void MBI5030::spi_out_low(void)
{
*_spi_out_PORT &= ~_spi_out_pinmask;
}
inline void MBI5030::spi_clk_high(void)
{
*_spi_clk_PORT |= _spi_clk_pinmask;
}
inline void MBI5030::spi_clk_low(void)
{
*_spi_clk_PORT &= ~_spi_clk_pinmask;
}
inline void MBI5030::spi_latch_high(void)
{
*_spi_latch_PORT |= _spi_latch_pinmask;
}
inline void MBI5030::spi_latch_low(void)
{
*_spi_latch_PORT &= ~_spi_latch_pinmask;
}
inline void MBI5030::pulse_spi_clk(void)
{
*_spi_clk_PORT |= _spi_clk_pinmask;
*_spi_clk_PORT &= ~_spi_clk_pinmask;
}
void MBI5030::update(uint16_t * pwm_data)
{
uint8_t data_word;
uint8_t data_word_bit;
uint16_t pwm_data_tmp;
//
// measure how long one update-cycle takes
//
// uint32_t start;
// uint32_t stop;
// start = micros();
// send the first 15 words with "data-latch"
// the input shift register is 16bit wide
// it requires a "data-latch" to move the data to
// the chip-internal buffers
for (data_word = 0; data_word <= (16 - 2); data_word++) {
pwm_data_tmp = pwm_data[data_word];
for (data_word_bit = 0; data_word_bit <= 14; data_word_bit++) {
// set or clear data - MSB first !
if (pwm_data_tmp & _BV(15)) {
spi_out_high();
} else {
spi_out_low();
}
// pulse spi clock and shift temporary data by 1 to the left
pulse_spi_clk();
pwm_data_tmp <<= 1;
}
spi_latch_high(); // "data-latch" START
if (pwm_data_tmp & _BV(15)) {
spi_out_high();
} else {
spi_out_low();
}
pulse_spi_clk();
spi_latch_low(); // "data-latch" END
}
// send the last word with "global-latch"
// to transfer the last word and make the data "live"
pwm_data_tmp = pwm_data[15];
for (data_word_bit = 0; data_word_bit <= 12; data_word_bit++) {
if (pwm_data_tmp & _BV(15)) {
spi_out_high();
} else {
spi_out_low();
}
pulse_spi_clk();
pwm_data_tmp <<= 1;
}
spi_latch_high(); // "global-latch" START
if (pwm_data_tmp & _BV(15)) {
spi_out_high();
} else {
spi_out_low();
}
pulse_spi_clk();
pwm_data_tmp <<= 1;
if (pwm_data_tmp & _BV(15)) {
spi_out_high();
} else {
spi_out_low();
}
pulse_spi_clk();
pwm_data_tmp <<= 1;
if (pwm_data_tmp & _BV(15)) {
spi_out_high();
} else {
spi_out_low();
}
pulse_spi_clk();
spi_latch_low(); // "global-latch" END
//
// measure how long one update-cycle takes
//
//stop = micros();
//Serial.println(stop-start);
}
void MBI5030::enable_error_detection(void)
{
spi_latch_high();
pulse_spi_clk();
pulse_spi_clk();
pulse_spi_clk();
pulse_spi_clk();
pulse_spi_clk();
spi_clk_high();
spi_latch_low();
spi_clk_low();
delayMicroseconds(64); // some time to stabilize readings
}
void MBI5030::prepare_error_report(void)
{
spi_latch_high();
pulse_spi_clk();
pulse_spi_clk();
pulse_spi_clk();
pulse_spi_clk();
pulse_spi_clk();
pulse_spi_clk();
pulse_spi_clk();
pulse_spi_clk();
spi_clk_high();
spi_latch_low();
spi_clk_low();
}
uint16_t MBI5030::read_error_report(void)
{
enable_error_detection();
prepare_error_report();
return read_register();
}
uint16_t MBI5030::read_register(void)
{
uint16_t register_status = 0;
uint8_t register_status_bit;
// read bits 0-14
for (register_status_bit = 0; register_status_bit <= 14;
register_status_bit++) {
if (*_spi_in_PIN & _spi_in_pinmask) {
register_status |= _BV(0);
} else {
// already full with zeros
}
pulse_spi_clk();
register_status <<= 1;
}
// read bit 15
if (*_spi_in_PIN & _spi_in_pinmask) {
register_status |= _BV(0);
} else {
// already full with zeros
}
return register_status;
}
void MBI5030::prepare_config_read(void)
{
pulse_spi_clk();
pulse_spi_clk();
pulse_spi_clk();
pulse_spi_clk();
pulse_spi_clk();
pulse_spi_clk();
pulse_spi_clk();
pulse_spi_clk();
pulse_spi_clk();
pulse_spi_clk();
pulse_spi_clk();
spi_latch_high();
pulse_spi_clk();
pulse_spi_clk();
pulse_spi_clk();
pulse_spi_clk();
spi_clk_high();
spi_latch_low();
spi_clk_low();
}
uint16_t MBI5030::read_config(void)
{
prepare_config_read();
return read_register();
}
void MBI5030::write_config(uint16_t config_mask, uint8_t current_gain)
{
uint16_t current_gain_mask = (((uint16_t) (current_gain)) << 2);
uint16_t config_data = (0x0000 | config_mask | current_gain_mask);
uint8_t config_data_bit;
// send first 5 bits
for (config_data_bit = 0; config_data_bit <= 4; config_data_bit++) {
if (config_data & _BV(15)) {
spi_out_high();
} else {
spi_out_low();
}
pulse_spi_clk();
config_data <<= 1;
}
spi_latch_high();
// send bits 5..14
for (config_data_bit = 5; config_data_bit <= 14; config_data_bit++) {
if (config_data & _BV(15)) {
spi_out_high();
} else {
spi_out_low();
}
pulse_spi_clk();
config_data <<= 1;
}
// send last bit
if (config_data & _BV(15)) {
spi_out_high();
} else {
spi_out_low();
}
spi_clk_high();
spi_latch_low();
spi_clk_low();
}