int get_cursor_pos() {
byte_out(SCREEN_CTRL, CLR_HIGH);
int offset = byte_in(SCREEN_DATA) << 8;
byte_out(SCREEN_CTRL, CLR_LOW);
offset += byte_in(SCREEN_DATA);
return offset;
}
void set_cursor_pos(short x, short y) {
int offset = get_screen_offset(x, y);
byte_out(SCREEN_CTRL, CLR_HIGH);
byte_out(SCREEN_DATA, (unsigned char) ( offset >> 8 ) );
byte_out(SCREEN_CTRL, CLR_LOW);
byte_out(SCREEN_DATA, (unsigned char) offset);
}
void eeprom_ByteWrite(uint16_t address, uint8_t data)
{
ACK_Poll(); // Begin ACK polling
bstart(); // Generate Start condition
byte_out(eeprom_control); // Output control byte
byte_out((uint8_t)(address>>8));// Output address MSB
byte_out((uint8_t)address); // Output address LSB
byte_out(data); // Output data byte
bstop(); // Generate Stop condition
}
void eeprom_ByteRead(uint16_t address, uint8_t *data)
{
ACK_Poll(); // Begin ACK polling
bstart(); // Generate Start condition
byte_out(eeprom_control); // Output control byte
byte_out((uint8_t)(address>>8));// Output address MSB
byte_out((uint8_t)address); // Output address LSB
bstart(); // Generate Start condition
byte_out(eeprom_control | 0x01);// Output control byte
*data = byte_in(NAKBIT); // Input data byte
bstop(); // Generate Stop condition
}
void eeprom_PageWrite(uint16_t address, uint8_t *data, uint8_t numbytes)
{
uint8_t i; // Loop counter
ACK_Poll(); // Begin ACK polling
bstart(); // Generate Start condition
byte_out(eeprom_control); // Output control byte
byte_out((uint8_t)(address>>8));// Output address MSB
byte_out((uint8_t)address); // Output address LSB
for (i = 0; i < numbytes; i++) // Loop through data bytes
{
byte_out(data[i]); // Output next data byte
}
bstop(); // Generate Stop condition
}
/********************************************************************
* Function: void ACK_Poll(void)
*
* Description: This function implements Acknowledge polling.
*******************************************************************/
void ACK_Poll(void)
{
uint8_t result; // Polling result
result = 1; // Initialize result
do
{
bstart(); // Generate Start condition
result = byte_out(eeprom_control); // Output control byte
} while (result == 1);
bstop(); // Generate Stop condition
}
void eeprom_SequentialRead(uint16_t address, uint8_t *data, uint16_t numbytes)
{
uint16_t i; // Loop counter
ACK_Poll(); // Begin ACK polling
bstart(); // Generate Start condition
byte_out(eeprom_control); // Output control byte
byte_out((uint8_t)(address>>8));// Output address MSB
byte_out((uint8_t)address); // Output address LSB
bstart(); // Generate Start condition
byte_out(eeprom_control | 0x01);// Output control byte
for (i = 0; i < numbytes; i++) // Loop through data bytes
{
if (i < (numbytes - 1)) // Check if more data will be read
{
data[i] = byte_in(ACKBIT); // If not last, input byte & send ACK
}
else
{
data[i] = byte_in(NAKBIT); // If last byte, input byte & send NAK
}
}
bstop(); // Generate Stop condition
}
