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hoverboard-sideboard-hack-GD/Src/util.c
EmanuelFeru 570e11574e iBUS on AUX Serial is working 
- implemented iBUS
- updated the Tabs to spaces
2020-12-06 15:21:39 +01:00

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/**
* This file is part of the hoverboard-sideboard-hack project.
*
* Copyright (C) 2020-2021 Emanuel FERU <aerdronix@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
// Includes
#include <stdio.h>
#include <string.h>
#include "systick.h"
#include "gd32f1x0.h"
#include "defines.h"
#include "config.h"
#include "setup.h"
#include "util.h"
#include "mpu6050.h"
// USART1 variables
#ifdef SERIAL_CONTROL
static SerialSideboard Sideboard;
#endif
#if defined(SERIAL_DEBUG) || defined(SERIAL_FEEDBACK)
static uint8_t rx1_buffer[SERIAL_BUFFER_SIZE]; // USART Rx DMA circular buffer
static uint32_t rx1_buffer_len = ARRAY_LEN(rx1_buffer);
#endif
#ifdef SERIAL_FEEDBACK
static SerialFeedback Feedback;
static SerialFeedback FeedbackRaw;
static uint16_t timeoutCntSerial1 = 0; // Timeout counter for UART1 Rx Serial
static uint8_t timeoutFlagSerial1 = 0; // Timeout Flag for UART1 Rx Serial: 0 = OK, 1 = Problem detected (line disconnected or wrong Rx data)
static uint32_t Feedback_len = sizeof(Feedback);
#endif
// USART0 variables
#ifdef SERIAL_AUX_TX
static SerialAuxTx AuxTx;
#endif
#ifdef SERIAL_AUX_RX
static uint8_t rx0_buffer[SERIAL_BUFFER_SIZE]; // USART Rx DMA circular buffer
static uint32_t rx0_buffer_len = ARRAY_LEN(rx0_buffer);
#endif
#ifdef SERIAL_AUX_RX
static SerialCommand command;
static SerialCommand command_raw;
static uint16_t timeoutCntSerial0 = 0; // Timeout counter for UART0 Rx Serial
static uint8_t timeoutFlagSerial0 = 0; // Timeout Flag for UART0 Rx Serial: 0 = OK, 1 = Problem detected (line disconnected or wrong Rx data)
static uint32_t command_len = sizeof(command);
extern uint8_t print_aux;
#ifdef CONTROL_IBUS
static uint16_t ibus_chksum;
static uint16_t ibus_captured_value[IBUS_NUM_CHANNELS];
#endif
#endif
#if (defined(SERIAL_AUX_RX) && defined(CONTROL_IBUS)) || defined(SERIAL_CONTROL)
static int16_t cmd1, cmd2;
static uint16_t cmdSwitch;
#endif
// Optical sensors variables
static FlagStatus sensor1, sensor2; // holds the sensor1 and sensor 2 values
static FlagStatus sensor1_read, sensor2_read; // holds the instantaneous Read for sensor1 and sensor 2
// MPU variables
extern MPU_Data mpu; // holds the MPU-6050 data
#if defined(MPU_SENSOR_ENABLE) || defined(SERIAL_CONTROL)
static ErrStatus mpuStatus; // holds the MPU-6050 status: SUCCESS or ERROR
#endif
extern uint32_t main_loop_counter; // main loop counter to perform task scheduling inside main()
// MAIN I2C variables
volatile int8_t i2c_status;
volatile i2c_cmd i2c_ReadWriteCmd;
volatile uint8_t i2c_regAddress;
volatile uint8_t i2c_slaveAddress;
volatile uint8_t* i2c_txbuffer;
volatile uint8_t* i2c_rxbuffer;
volatile uint8_t i2c_nDABytes;
volatile int8_t i2c_nRABytes;
volatile uint8_t buffer[14];
#ifdef AUX45_USE_I2C
// AUX I2C variables
volatile int8_t i2c_aux_status;
volatile i2c_cmd i2c_aux_ReadWriteCmd;
volatile uint8_t i2c_aux_regAddress;
volatile uint8_t i2c_aux_slaveAddress;
volatile uint8_t* i2c_aux_txbuffer;
volatile uint8_t* i2c_aux_rxbuffer;
volatile uint8_t i2c_aux_nDABytes;
volatile int8_t i2c_aux_nRABytes;
#endif
/* =========================== General Functions =========================== */
void consoleLog(char *message)
{
#ifdef SERIAL_DEBUG
log_i("%s", message);
#endif
}
/* retarget the C library printf function to the USART */
#ifdef SERIAL_DEBUG
#ifdef __GNUC__
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif
PUTCHAR_PROTOTYPE {
usart_data_transmit(USART_MAIN, (uint8_t)ch);
while(RESET == usart_flag_get(USART_MAIN, USART_FLAG_TBE));
return ch;
}
#ifdef __GNUC__
int _write(int file, char *data, int len) {
int i;
for (i = 0; i < len; i++) { __io_putchar( *data++ );}
return len;
}
#endif
#endif
void toggle_led(uint32_t gpio_periph, uint32_t pin)
{
GPIO_OCTL(gpio_periph) ^= pin;
}
void intro_demo_led(uint32_t tDelay)
{
int i;
for (i = 0; i < 3; i++) {
gpio_bit_set(LED1_GPIO_Port, LED1_Pin);
gpio_bit_reset(LED3_GPIO_Port, LED3_Pin);
delay_1ms(tDelay);
gpio_bit_set(LED2_GPIO_Port, LED2_Pin);
gpio_bit_reset(LED1_GPIO_Port, LED1_Pin);
delay_1ms(tDelay);
gpio_bit_set(LED3_GPIO_Port, LED3_Pin);
gpio_bit_reset(LED2_GPIO_Port, LED2_Pin);
delay_1ms(tDelay);
}
for (i = 0; i < 2; i++) {
gpio_bit_set(LED1_GPIO_Port, LED1_Pin);
gpio_bit_set(LED2_GPIO_Port, LED2_Pin);
gpio_bit_set(LED3_GPIO_Port, LED3_Pin);
gpio_bit_set(LED4_GPIO_Port, LED4_Pin);
gpio_bit_set(LED5_GPIO_Port, LED5_Pin);
delay_1ms(tDelay);
gpio_bit_reset(LED1_GPIO_Port, LED1_Pin);
gpio_bit_reset(LED2_GPIO_Port, LED2_Pin);
gpio_bit_reset(LED3_GPIO_Port, LED3_Pin);
gpio_bit_reset(LED4_GPIO_Port, LED4_Pin);
gpio_bit_reset(LED5_GPIO_Port, LED5_Pin);
}
}
uint8_t switch_check(uint16_t ch, uint8_t type) {
if (type) { // 3 position switch
if (ch > 850) return 2; // switch in position 2
else if (ch > 250) return 1; // switch in position 1
else return 0; // switch in position 0
} else { // 2 positions switch
return (ch > 850);
}
}
/* =========================== Input Initialization Function =========================== */
void input_init(void) {
#ifdef SERIAL_CONTROL
usart_Tx_DMA_config(USART_MAIN, (uint8_t *)&Sideboard, sizeof(Sideboard));
#endif
#if defined(SERIAL_DEBUG) || defined(SERIAL_FEEDBACK)
usart_Rx_DMA_config(USART_MAIN, (uint8_t *)rx1_buffer, sizeof(rx1_buffer));
#endif
#ifdef SERIAL_AUX_TX
usart_Tx_DMA_config(USART_AUX, (uint8_t *)&AuxTx, sizeof(AuxTx));
#endif
#ifdef SERIAL_AUX_RX
usart_Rx_DMA_config(USART_AUX, (uint8_t *)rx0_buffer, sizeof(rx0_buffer));
#endif
intro_demo_led(100); // Short LEDs intro demo with 100 ms delay. This also gives some time for the MPU-6050 to power-up.
#ifdef MPU_SENSOR_ENABLE
if(mpu_config()) { // IMU MPU-6050 config
mpuStatus = ERROR;
gpio_bit_set(LED1_GPIO_Port, LED1_Pin); // Turn on RED LED - sensor enabled and NOT ok
}
else {
mpuStatus = SUCCESS;
gpio_bit_set(LED2_GPIO_Port, LED2_Pin); // Turn on GREEN LED - sensor enabled and ok
}
#else
gpio_bit_set(LED2_GPIO_Port, LED2_Pin); // Turn on GREEN LED - sensor disabled
#endif
#ifdef SERIAL_DEBUG
mpu_handle_input('h'); // Print the User Help commands to serial
#endif
}
/* =========================== Handle Functions =========================== */
/*
* Handle of the MPU-6050 IMU sensor
*/
void handle_mpu6050(void) {
#ifdef MPU_SENSOR_ENABLE
// Get MPU data. Because the MPU-6050 interrupt pin is not wired we have to check DMP data by pooling periodically
if (SUCCESS == mpuStatus) {
mpu_get_data();
} else if (ERROR == mpuStatus && main_loop_counter % 100 == 0) {
toggle_led(LED1_GPIO_Port, LED1_Pin); // Toggle the Red LED every 100 ms
}
// Print MPU data to Console
#ifdef SERIAL_DEBUG
if (main_loop_counter % 50 == 0) {
mpu_print_to_console();
}
#endif
#endif
}
/*
* Handle of the optical sensors
*/
void handle_sensors(void) {
sensor1_read = gpio_input_bit_get(SENSOR1_GPIO_Port, SENSOR1_Pin);
sensor2_read = gpio_input_bit_get(SENSOR2_GPIO_Port, SENSOR2_Pin);
// SENSOR1
if (sensor1 == RESET && sensor1_read == SET) {
// Sensor ACTIVE: Do something here (one time task on activation)
sensor1 = SET;
gpio_bit_set(LED4_GPIO_Port, LED4_Pin);
consoleLog("SENSOR 1 ON\r\n");
} else if(sensor1 == SET && sensor1_read == RESET) {
// Sensor DEACTIVE: Do something here (one time task on deactivation)
sensor1 = RESET;
gpio_bit_reset(LED4_GPIO_Port, LED4_Pin);
consoleLog("SENSOR 1 OFF\r\n");
}
// SENSOR2
if (sensor2 == RESET && sensor2_read == SET) {
// Sensor ACTIVE: Do something here (one time task on activation)
sensor2 = SET;
gpio_bit_set(LED5_GPIO_Port, LED5_Pin);
consoleLog("SENSOR 2 ON\r\n");
} else if (sensor2 == SET && sensor2_read == RESET) {
// Sensor DEACTIVE: Do something here (one time task on deactivation)
sensor2 = RESET;
gpio_bit_reset(LED5_GPIO_Port, LED5_Pin);
consoleLog("SENSOR 2 OFF\r\n");
}
if (sensor1 == SET) {
// Sensor ACTIVE: Do something here (continuous task)
}
if (sensor2 == SET) {
// Sensor ACTIVE: Do something here (continuous task)
}
}
/*
* Handle of the USART data
*/
void handle_usart(void) {
// Tx USART MAIN
#ifdef SERIAL_CONTROL
if (main_loop_counter % 5 == 0 && dma_transfer_number_get(USART1_TX_DMA_CH) == 0) { // Check if DMA channel counter is 0 (meaning all data has been transferred)
Sideboard.start = (uint16_t)SERIAL_START_FRAME;
Sideboard.pitch = (int16_t)mpu.euler.pitch;
Sideboard.dPitch = (int16_t)mpu.gyro.y;
Sideboard.cmd1 = (int16_t)cmd1;
Sideboard.cmd2 = (int16_t)cmd2;
Sideboard.sensors = (uint16_t)( (cmdSwitch << 8) | (sensor1 | (sensor2 << 1) | (mpuStatus << 2)) );
Sideboard.checksum = (uint16_t)(Sideboard.start ^ Sideboard.pitch ^ Sideboard.dPitch ^ Sideboard.cmd1 ^ Sideboard.cmd2 ^ Sideboard.sensors);
dma_channel_disable(USART1_TX_DMA_CH);
DMA_CHCNT(USART1_TX_DMA_CH) = sizeof(Sideboard);
DMA_CHMADDR(USART1_TX_DMA_CH) = (uint32_t)&Sideboard;
dma_channel_enable(USART1_TX_DMA_CH);
}
#endif
// Rx USART MAIN
#ifdef SERIAL_FEEDBACK
if (timeoutCntSerial1++ >= SERIAL_TIMEOUT) { // Timeout qualification
timeoutFlagSerial1 = 1; // Timeout detected
timeoutCntSerial1 = SERIAL_TIMEOUT; // Limit timout counter value
}
if (timeoutFlagSerial1 && main_loop_counter % 100 == 0) { // In case of timeout bring the system to a Safe State and indicate error if desired
toggle_led(LED3_GPIO_Port, LED3_Pin); // Toggle the Yellow LED every 100 ms
}
#endif
// Tx USART AUX
#ifdef SERIAL_AUX_TX
if (main_loop_counter % 5 == 0 && dma_transfer_number_get(USART0_TX_DMA_CH) == 0) { // Check if DMA channel counter is 0 (meaning all data has been transferred)
AuxTx.start = (uint16_t)SERIAL_START_FRAME;
AuxTx.signal1 = (int16_t)sensor1;
AuxTx.signal2 = (int16_t)sensor2;
AuxTx.checksum = (uint16_t)(AuxTx.start ^ AuxTx.signal1 ^ AuxTx.signal2);
dma_channel_disable(USART0_TX_DMA_CH);
DMA_CHCNT(USART0_TX_DMA_CH) = sizeof(AuxTx);
DMA_CHMADDR(USART0_TX_DMA_CH) = (uint32_t)&AuxTx;
dma_channel_enable(USART0_TX_DMA_CH);
}
#endif
// Rx USART AUX
#ifdef SERIAL_AUX_RX
#ifdef CONTROL_IBUS
if (!timeoutFlagSerial0) {
for (uint8_t i = 0; i < (IBUS_NUM_CHANNELS * 2); i+=2) {
ibus_captured_value[(i/2)] = CLAMP(command.channels[i] + (command.channels[i+1] << 8) - 1000, 0, 1000); // 1000-2000 -> 0-1000
}
cmd1 = (ibus_captured_value[0] - 500) * 2; // Channel 1
cmd2 = (ibus_captured_value[1] - 500) * 2; // Channel 2
cmdSwitch = (uint16_t)(switch_check(ibus_captured_value[6],0) | // Channel 7
switch_check(ibus_captured_value[7],1) << 1 | // Channel 8
switch_check(ibus_captured_value[8],1) << 3 | // Channel 9
switch_check(ibus_captured_value[9],0) << 5); // Channel 10
}
#endif
if (timeoutCntSerial0++ >= SERIAL_TIMEOUT) { // Timeout qualification
timeoutFlagSerial0 = 1; // Timeout detected
timeoutCntSerial0 = SERIAL_TIMEOUT; // Limit timout counter value
cmd1 = cmd2 = 0; // Set commands to 0
cmdSwitch &= ~(1U << 0); // Clear Bit 0, to switch to default control input
}
// if (timeoutFlagSerial0 && main_loop_counter % 100 == 0) { // In case of timeout bring the system to a Safe State and indicate error if desired
// toggle_led(LED2_GPIO_Port, LED2_Pin); // Toggle the Green LED every 100 ms
// }
#ifdef SERIAL_DEBUG
// Print MPU data to Console
if (main_loop_counter % 50 == 0) {
aux_print_to_console();
}
#endif
#endif
}
/*
* Handle of the sideboard LEDs
*/
void handle_leds(void){
#ifdef SERIAL_FEEDBACK
if (!timeoutFlagSerial1) {
if (Feedback.cmdLed & LED1_SET) { gpio_bit_set(LED1_GPIO_Port, LED1_Pin); } else { gpio_bit_reset(LED1_GPIO_Port, LED1_Pin); }
if (Feedback.cmdLed & LED2_SET) { gpio_bit_set(LED2_GPIO_Port, LED2_Pin); } else { gpio_bit_reset(LED2_GPIO_Port, LED2_Pin); }
if (Feedback.cmdLed & LED3_SET) { gpio_bit_set(LED3_GPIO_Port, LED3_Pin); } else { gpio_bit_reset(LED3_GPIO_Port, LED3_Pin); }
if (Feedback.cmdLed & LED4_SET) { gpio_bit_set(LED4_GPIO_Port, LED4_Pin); } else { gpio_bit_reset(LED4_GPIO_Port, LED4_Pin); }
if (Feedback.cmdLed & LED5_SET) { gpio_bit_set(LED5_GPIO_Port, LED5_Pin); } else { gpio_bit_reset(LED5_GPIO_Port, LED5_Pin); }
if (Feedback.cmdLed & LED4_SET) { gpio_bit_set(AUX3_GPIO_Port, AUX3_Pin); } else { gpio_bit_reset(AUX3_GPIO_Port, AUX3_Pin); }
}
#endif
}
/* =========================== USART1 READ Functions =========================== */
void usart1_rx_check(void)
{
#ifdef SERIAL_DEBUG
static uint32_t old_pos;
uint32_t pos;
pos = rx1_buffer_len - dma_transfer_number_get(USART1_RX_DMA_CH); // Calculate current position in buffer
if (pos != old_pos) { // Check change in received data
if (pos > old_pos) { // "Linear" buffer mode: check if current position is over previous one
usart_process_debug(&rx1_buffer[old_pos], pos - old_pos); // Process data
} else { // "Overflow" buffer mode
usart_process_debug(&rx1_buffer[old_pos], rx1_buffer_len - old_pos);// First Process data from the end of buffer
if (pos > 0) { // Check and continue with beginning of buffer
usart_process_debug(&rx1_buffer[0], pos); // Process remaining data
}
}
}
old_pos = pos; // Update old position
if (old_pos == rx1_buffer_len) { // Check and manually update if we reached end of buffer
old_pos = 0;
}
#endif // SERIAL_DEBUG
#ifdef SERIAL_FEEDBACK
static uint32_t old_pos;
uint32_t pos;
uint8_t *ptr;
pos = rx1_buffer_len - dma_transfer_number_get(USART1_RX_DMA_CH); // Calculate current position in buffer
if (pos != old_pos) { // Check change in received data
ptr = (uint8_t *)&FeedbackRaw; // Initialize the pointer with FeedbackRaw address
if (pos > old_pos && (pos - old_pos) == Feedback_len) { // "Linear" buffer mode: check if current position is over previous one AND data length equals expected length
memcpy(ptr, &rx1_buffer[old_pos], Feedback_len); // Copy data. This is possible only if FeedbackRaw is contiguous! (meaning all the structure members have the same size)
usart_process_data(&FeedbackRaw, &Feedback); // Process data
} else if ((rx1_buffer_len - old_pos + pos) == Feedback_len) { // "Overflow" buffer mode: check if data length equals expected length
memcpy(ptr, &rx1_buffer[old_pos], rx1_buffer_len - old_pos); // First copy data from the end of buffer
if (pos > 0) { // Check and continue with beginning of buffer
ptr += rx1_buffer_len - old_pos; // Move to correct position in FeedbackRaw
memcpy(ptr, &rx1_buffer[0], pos); // Copy remaining data
}
usart_process_data(&FeedbackRaw, &Feedback); // Process data
}
}
old_pos = pos; // Updated old position
if (old_pos == rx1_buffer_len) { // Check and manually update if we reached end of buffer
old_pos = 0;
}
#endif // SERIAL_FEEDBACK
}
/*
* Process Rx debug user command input
*/
#ifdef SERIAL_DEBUG
void usart_process_debug(uint8_t *userCommand, uint32_t len)
{
for (; len > 0; len--, userCommand++) {
if (*userCommand != '\n' && *userCommand != '\r') { // Do not accept 'new line' and 'carriage return' commands
log_i("Command = %c\r\n", *userCommand);
mpu_handle_input(*userCommand);
}
}
}
#endif // SERIAL_DEBUG
/*
* Process Rx data
* - if the Feedback_in data is valid (correct START_FRAME and checksum) copy the Feedback_in to Feedback_out
*/
#ifdef SERIAL_FEEDBACK
void usart_process_data(SerialFeedback *Feedback_in, SerialFeedback *Feedback_out)
{
uint16_t checksum;
if (Feedback_in->start == SERIAL_START_FRAME) {
checksum = (uint16_t)(Feedback_in->start ^ Feedback_in->cmd1 ^ Feedback_in->cmd2 ^ Feedback_in->speedR_meas ^ Feedback_in->speedL_meas
^ Feedback_in->batVoltage ^ Feedback_in->boardTemp ^ Feedback_in->cmdLed);
if (Feedback_in->checksum == checksum) {
*Feedback_out = *Feedback_in;
timeoutCntSerial1 = 0; // Reset timeout counter
timeoutFlagSerial1 = 0; // Clear timeout flag
}
}
}
#endif // SERIAL_FEEDBACK
/* =========================== USART0 READ Functions =========================== */
/*
* Check for new data received on USART with DMA: refactored function from https://github.com/MaJerle/stm32-usart-uart-dma-rx-tx
* - this function is called for every USART IDLE line detection, in the USART interrupt handler
*/
void usart0_rx_check(void)
{
#ifdef SERIAL_AUX_RX
static uint32_t old_pos;
uint32_t pos;
uint8_t *ptr;
pos = rx0_buffer_len - dma_transfer_number_get(USART0_RX_DMA_CH); // Calculate current position in buffer
if (pos != old_pos) { // Check change in received data
ptr = (uint8_t *)&command_raw; // Initialize the pointer with structure address
if (pos > old_pos && (pos - old_pos) == command_len) { // "Linear" buffer mode: check if current position is over previous one AND data length equals expected length
memcpy(ptr, &rx0_buffer[old_pos], command_len); // Copy data. This is possible only if structure is contiguous! (meaning all the structure members have the same size)
usart_process_command(&command_raw, &command); // Process data
} else if ((rx0_buffer_len - old_pos + pos) == command_len) { // "Overflow" buffer mode: check if data length equals expected length
memcpy(ptr, &rx0_buffer[old_pos], rx0_buffer_len - old_pos); // First copy data from the end of buffer
if (pos > 0) { // Check and continue with beginning of buffer
ptr += rx0_buffer_len - old_pos; // Update position
memcpy(ptr, &rx0_buffer[0], pos); // Copy remaining data
}
usart_process_command(&command_raw, &command); // Process data
}
}
old_pos = pos; // Updated old position
if (old_pos == rx0_buffer_len) { // Check and manually update if we reached end of buffer
old_pos = 0;
}
#endif // SERIAL_AUX_RX
}
/*
* Process command UART0 Rx data
* - if the command_in data is valid (correct START_FRAME and checksum) copy the command_in to command_out
*/
#ifdef SERIAL_AUX_RX
void usart_process_command(SerialCommand *command_in, SerialCommand *command_out)
{
#ifdef CONTROL_IBUS
if (command_in->start == IBUS_LENGTH && command_in->type == IBUS_COMMAND) {
ibus_chksum = 0xFFFF - IBUS_LENGTH - IBUS_COMMAND;
for (uint8_t i = 0; i < (IBUS_NUM_CHANNELS * 2); i++) {
ibus_chksum -= command_in->channels[i];
}
if (ibus_chksum == (uint16_t)((command_in->checksumh << 8) + command_in->checksuml)) {
*command_out = *command_in;
timeoutCntSerial0 = 0; // Reset timeout counter
timeoutFlagSerial0 = 0; // Clear timeout flag
}
}
#endif
}
#endif
/* =========================== AUX Serial Print data =========================== */
void aux_print_to_console(void)
{
#if defined(SERIAL_DEBUG) && defined(SERIAL_AUX_RX)
#ifdef CONTROL_IBUS
if (print_aux & PRINT_AUX) {
log_i( "Ch1: %d Ch2: %d Sw: %u\r\n", cmd1, cmd2, cmdSwitch);
}
#endif
#endif
}
/* =========================== I2C WRITE Functions =========================== */
/*
* write bytes to chip register
*/
int8_t i2c_writeBytes(uint8_t slaveAddr, uint8_t regAddr, uint8_t length, uint8_t *data)
{
// assign WRITE command
i2c_ReadWriteCmd = WRITE;
// assign inputs
i2c_status = -1;
i2c_slaveAddress = slaveAddr << 1; // Address is shifted one position to the left. LSB is reserved for the Read/Write bit.
i2c_regAddress = regAddr;
i2c_txbuffer = data;
i2c_nDABytes = length;
i2c_nRABytes = 1;
// enable the I2C0 interrupt
i2c_interrupt_enable(MPU_I2C, I2C_INT_ERR | I2C_INT_BUF | I2C_INT_EV);
// the master waits until the I2C bus is idle
while(i2c_flag_get(MPU_I2C, I2C_FLAG_I2CBSY));
// the master sends a start condition to I2C bus
i2c_start_on_bus(MPU_I2C);
// Wait until all data bytes are sent/received
while(i2c_nDABytes > 0);
return i2c_status;
}
/*
* write 1 byte to chip register
*/
int8_t i2c_writeByte(uint8_t slaveAddr, uint8_t regAddr, uint8_t data)
{
return i2c_writeBytes(slaveAddr, regAddr, 1, &data);
}
/*
* write one bit to chip register
*/
int8_t i2c_writeBit(uint8_t slaveAddr, uint8_t regAddr, uint8_t bitNum, uint8_t data) {
uint8_t b;
i2c_readByte(slaveAddr, regAddr, &b);
b = (data != 0) ? (b | (1 << bitNum)) : (b & ~(1 << bitNum));
return i2c_writeByte(slaveAddr, regAddr, b);
}
/* =========================== I2C READ Functions =========================== */
/*
* read bytes from chip register
*/
int8_t i2c_readBytes(uint8_t slaveAddr, uint8_t regAddr, uint8_t length, uint8_t *data)
{
// assign READ command
i2c_ReadWriteCmd = READ;
// assign inputs
i2c_status = -1;
i2c_slaveAddress = slaveAddr << 1; // Address is shifted one position to the left. LSB is reserved for the Read/Write bit.
i2c_regAddress = regAddr;
i2c_rxbuffer = data;
i2c_nDABytes = length;
i2c_nRABytes = 1;
// enable the I2C0 interrupt
i2c_interrupt_enable(MPU_I2C, I2C_INT_ERR | I2C_INT_BUF | I2C_INT_EV);
if(2 == i2c_nDABytes){
i2c_ackpos_config(MPU_I2C, I2C_ACKPOS_NEXT); // send ACK for the next byte
}
// the master waits until the I2C bus is idle
while(i2c_flag_get(MPU_I2C, I2C_FLAG_I2CBSY));
// the master sends a start condition to I2C bus
i2c_start_on_bus(MPU_I2C);
// Wait until all data bytes are sent/received
while(i2c_nDABytes > 0);
// Return status
return i2c_status;
}
/*
* read 1 byte from chip register
*/
int8_t i2c_readByte(uint8_t slaveAddr, uint8_t regAddr, uint8_t *data)
{
return i2c_readBytes(slaveAddr, regAddr, 1, data);
}
/*
* read 1 bit from chip register
*/
int8_t i2c_readBit(uint8_t slaveAddr, uint8_t regAddr, uint8_t bitNum, uint8_t *data)
{
uint8_t b;
int8_t status = i2c_readByte(slaveAddr, regAddr, &b);
*data = b & (1 << bitNum);
return status;
}
#ifdef AUX45_USE_I2C
/*
* write bytes to chip register
*/
int8_t i2c_aux_writeBytes(uint8_t slaveAddr, uint8_t regAddr, uint8_t length, uint8_t *data)
{
// assign WRITE command
i2c_aux_ReadWriteCmd = WRITE;
// assign inputs
i2c_aux_status = -1;
i2c_aux_slaveAddress = slaveAddr << 1; // Address is shifted one position to the left. LSB is reserved for the Read/Write bit.
i2c_aux_regAddress = regAddr;
i2c_aux_txbuffer = data;
i2c_aux_nDABytes = length;
i2c_aux_nRABytes = 1;
// enable the I2C0 interrupt
i2c_interrupt_enable(AUX_I2C, I2C_INT_ERR | I2C_INT_BUF | I2C_INT_EV);
// the master waits until the I2C bus is idle
while(i2c_flag_get(AUX_I2C, I2C_FLAG_I2CBSY));
// the master sends a start condition to I2C bus
i2c_start_on_bus(AUX_I2C);
// Wait until all data bytes are sent/received
while(i2c_aux_nDABytes > 0);
return i2c_aux_status;
}
/*
* read bytes from chip register
*/
int8_t i2c_aux_readBytes(uint8_t slaveAddr, uint8_t regAddr, uint8_t length, uint8_t *data)
{
// assign READ command
i2c_aux_ReadWriteCmd = READ;
// assign inputs
i2c_aux_status = -1;
i2c_aux_slaveAddress = slaveAddr << 1; // Address is shifted one position to the left. LSB is reserved for the Read/Write bit.
i2c_aux_regAddress = regAddr;
i2c_aux_rxbuffer = data;
i2c_aux_nDABytes = length;
i2c_aux_nRABytes = 1;
// enable the I2C0 interrupt
i2c_interrupt_enable(AUX_I2C, I2C_INT_ERR | I2C_INT_BUF | I2C_INT_EV);
if(2 == i2c_aux_nDABytes){
i2c_ackpos_config(AUX_I2C, I2C_ACKPOS_NEXT); // send ACK for the next byte
}
// the master waits until the I2C bus is idle
while(i2c_flag_get(AUX_I2C, I2C_FLAG_I2CBSY));
// the master sends a start condition to I2C bus
i2c_start_on_bus(AUX_I2C);
// Wait until all data bytes are sent/received
while(i2c_aux_nDABytes > 0);
// Return status
return i2c_aux_status;
}
#endif
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