// send a number of bytes to the rtc over i2c
// returns true to indicate success
static bool ICACHE_FLASH_ATTR ds1307_send(uint8 *data, uint8 len) {
int loop;
// signal i2c start
i2c_master_start();
// write address & direction
i2c_master_writeByte((uint8)(DS1307_ADDR << 1));
if (!i2c_master_checkAck()) {
//uart0_send("i2c error1\r\n");
i2c_master_stop();
return false;
}
// send the data
for (loop = 0; loop < len; loop++) {
i2c_master_writeByte(data[loop]);
if (!i2c_master_checkAck()) {
//uart0_send("i2c error2\r\n");
i2c_master_stop();
return false;
}
}
// signal i2c stop
i2c_master_stop();
return true;
}
static bool ICACHE_FLASH_ATTR singleByteWrite(uint8_t adr, uint8_t reg, uint8_t data){
i2c_master_start();
i2c_master_writeByte((uint8_t)(adr << 1));
if (!i2c_master_checkAck()) {
i2c_master_stop();
return false;
}
i2c_master_writeByte(reg);
if (!i2c_master_checkAck()) {
i2c_master_stop();
return false;
}
i2c_master_writeByte(data);
if (!i2c_master_checkAck()) {
i2c_master_stop();
return false;
}
i2c_master_stop();
return true;
}
// set the current data address, this is the start of the write command
// next either send the data to be written, or start a read instead
// returns true to indicate success
static bool ICACHE_FLASH_ATTR at24c_setAddr(uint16 addr) {
uint8 loop;
uint8 data[2];
// signal i2c start
i2c_master_start();
// write i2c address & direction
i2c_master_writeByte((uint8)(AT24C_ADDR << 1));
if (!i2c_master_checkAck()) {
//uart0_send("i2c error\r\n");
i2c_master_stop();
return false;
}
// write data address
data[0] = (uint8)(((unsigned)addr) >> 8);
data[1] = (uint8)(((unsigned)addr) & 0xff);
for (loop = 0; loop < 2; loop++) {
i2c_master_writeByte(data[loop]);
if (!i2c_master_checkAck()) {
//uart0_send("i2c error\r\n");
i2c_master_stop();
return false;
}
}
return true;
}
bool i2c_master_writeBytes(uint8 address, uint8 *values, uint8 length)
{
i2c_master_start();
i2c_master_writeByte(address);
if (!i2c_master_checkAck())
{
i2c_master_stop();
#ifdef CONFIG_I2C_MASTER_DEBUG
console_printf( "Device not ACKed on address\n" );
#endif
return false;
}
for(uint8 i = 0; i < length; i++){
i2c_master_writeByte(values[i]);
if (!i2c_master_checkAck())
{
#ifdef CONFIG_I2C_MASTER_DEBUG
console_printf( "Device not ACKed on write\n" );
#endif
i2c_master_stop();
return false;
}
}
i2c_master_stop();
return true;
}
/************ low level data pushing commands **********/
void LCD_expanderWrite(uint8 _data){
i2c_master_start();
i2c_master_writeByte(LCD_ADDRESS << 1);
if (!i2c_master_checkAck())
{
i2c_master_stop();
return;
}
//i2c_master_writeByte((uint8)(_data) | _backlightval);
i2c_master_writeByte((uint8)(_data) | LCD_BACKLIGHT);
i2c_master_checkAck();
i2c_master_stop();
}
// read a number of bytes from the rtc over i2c
// returns true to indicate success
static bool ICACHE_FLASH_ATTR ds1307_recv(uint8 *data, uint8 len) {
int loop;
// signal i2c start
i2c_master_start();
// write address & direction
i2c_master_writeByte((uint8)((DS1307_ADDR << 1) | 1));
if (!i2c_master_checkAck()) {
//uart0_send("i2c error3\r\n");
i2c_master_stop();
return false;
}
// read bytes
for (loop = 0; loop < len; loop++) {
data[loop] = i2c_master_readByte();
// send ack (except after last byte, then we send nack)
if (loop < (len - 1)) i2c_master_send_ack(); else i2c_master_send_nack();
}
// signal i2c stop
i2c_master_stop();
return true;
}
// wait for a write operation to complete
// by 'acknowledge polling'
void ICACHE_FLASH_ATTR at24c_writeWait() {
do {
i2c_master_start();
i2c_master_writeByte((uint8)((AT24C_ADDR << 1) | 1));
} while (!i2c_master_checkAck());
i2c_master_stop();
}
// write within a page
// note if you try to write past a page boundary the write will
// wrap back to the start of the same page, so you need to know
// how much you're writing and where you're writing it to
// you don't need to start writing at the start of a page, but if you
// start in the middle you'll be able to write less before wrapping
// optionally wait for the eeprom to complete the write
// returns true to indicate success
bool ICACHE_FLASH_ATTR at24c_writeInPage(uint16 addr, uint8* data, uint8 len, bool wait) {
int loop;
// set data address (includes i2c setup,
// so no need to call i2c_master_start here)
if (!at24c_setAddr(addr)) return false;
// send the data
for (loop = 0; loop < len; loop++) {
i2c_master_writeByte(data[loop]);
if (!i2c_master_checkAck()) {
//uart0_send("i2c error\r\n");
i2c_master_stop();
return false;
}
}
// signal i2c stop
i2c_master_stop();
// optionally, wait until the eeprom signals the write is finished
if (wait) at24c_writeWait();
return true;
}
static bool ICACHE_FLASH_ATTR commandOnlyWrite(uint8_t adr, uint8_t reg){
i2c_master_start();
i2c_master_writeByte((uint8_t)(adr << 1));
if (!i2c_master_checkAck()) {
i2c_master_stop();
return false;
}
i2c_master_writeByte(reg);
if (!i2c_master_checkAck()) {
i2c_master_stop();
return false;
}
i2c_master_stop();
return true;
}
static bool ICACHE_FLASH_ATTR byteRead(uint8_t adr, uint8_t reg, uint8_t data[], uint8_t length){
uint8_t i;
i2c_master_start();
i2c_master_writeByte((uint8_t)(adr << 1));
if (!i2c_master_checkAck()) {
i2c_master_stop();
return false;
}
i2c_master_writeByte(reg);
if (!i2c_master_checkAck()) {
i2c_master_stop();
return false;
}
i2c_master_start();
i2c_master_writeByte((uint8_t)((adr << 1) | 1));
if (!i2c_master_checkAck()) {
i2c_master_stop();
return false;
}
for(i = 0; i < length-1; i++){
data[i] = i2c_master_readByte();
i2c_master_send_ack();
}
data[i] = i2c_master_readByte();
i2c_master_send_nack();
i2c_master_stop();
return true;
}
bool i2c_master_readBytes(uint8 address, uint8 *values, uint8 length)
{
if(values[0] > 0){
if(!i2c_master_writeBytes(address, values, 1)){
return false;
}
}
uint8 timeout = 100;
do{
i2c_master_start();
i2c_master_writeByte(address+1);
if(!i2c_master_checkAck()){
i2c_master_stop();
i2c_master_wait(1000);
continue;
}
break;
}while(--timeout>0);
if(timeout == 0){
return false;
}
#ifdef CONFIG_I2C_MASTER_DEBUG
console_printf("Read: ");
#endif
uint8 readed = 0;
while((readed < length) && (--timeout>0)){
uint8 byte = i2c_master_readByte();
values[readed++] = byte;
i2c_master_setAck((readed == length)); // send the ACK or NAK as applicable
i2c_master_setDC(1, 0); // release SDA
#ifdef CONFIG_I2C_MASTER_DEBUG
console_printf("%d ", byte);
#endif
}
#ifdef CONFIG_I2C_MASTER_DEBUG
console_printf("\n");
#endif
i2c_master_stop();
return true;
}
/* Wrote a simple I2C bus scanner to find connected i2C devices */
void i2c_bus_scan()
{
int index = 0;
uint8_t result;
os_printf("Scanning I2C bus for devices\r\n");
for (index=1; index <=127; index ++)
{
i2c_master_start(); // Start I2C request
i2c_master_writeByte(index<<1| 0b00000001); //DS1307 address + W
result = i2c_master_checkAck();
if (result)
{
os_printf("\tI2C device present at 0x%x\r\n", index);
}
i2c_master_stop();
}
}
uint8 LCD_init(){
i2c_master_start();
i2c_master_writeByte(LCD_ADDRESS << 1);
if (!i2c_master_checkAck()) {
i2c_master_stop();
return 0;
}
i2c_master_stop();
_displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
if (LCD_ROW > 1) {
_displayfunction |= LCD_2LINE;
}
_numlines = LCD_ROW;
// for some 1 line displays you can select a 10 pixel high font
if ((LCD_DOTSIZE != 0) && (LCD_ROW == 1)) {
_displayfunction |= LCD_5x10DOTS;
}
// SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!
// according to datasheet, we need at least 40ms after power rises above 2.7V
// before sending commands. Arduino can turn on way befer 4.5V so we'll wait 50
os_delay_us(50000);
// Now we pull both RS and R/W low to begin commands
LCD_expanderWrite(0); // reset expanderand turn backlight off
os_delay_us(1000000);
//put the LCD into 4 bit mode
// this is according to the hitachi HD44780 datasheet
// figure 24, pg 46
// we start in 8bit mode, try to set 4 bit mode
LCD_write4bits(0x30);
os_delay_us(4500); // wait min 4.1ms
// second try
LCD_write4bits(0x30);
os_delay_us(4500); // wait min 4.1ms
// third go!
LCD_write4bits(0x30);
os_delay_us(150);
// finally, set to 4-bit interface
LCD_write4bits(0x20);
// set # lines, font size, etc.
LCD_command(LCD_FUNCTIONSET | _displayfunction);
// turn the display on with no cursor or blinking default
_displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
LCD_display();
// clear it off
LCD_clear();
// Initialize to default text direction (for roman languages)
_displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
// set the entry mode
LCD_command(LCD_ENTRYMODESET | _displaymode);
LCD_home();
return 1;
}
