//CPU初始化//
int main(void)
{
EXCLK_DDR|=1<<EXCLK_BIT ;//en_exclk 引脚输出
HC245_OE_DDR|=1<<HC245_OE_BIT;//en_245引脚输出
CMOS_CLK_DDR|=1<<CMOS_CLK_BIT;//7660时钟允许引脚输出
DISEN_EXCLK;//禁止外部CLK，使单片机WR与TFT WR相连
DISEN_245;//禁止外部数据线，使单片机数据与TFT数据线相连
CLK_init();//输出时钟到7660
DATA_OUPUT(); //数据线输出，准备连数据线到TFT
LCD_Init();
//DATA_LCD_PORT=0xff;
LCD_write_english_string(20,60,"Guanfu_Wang 2009-08-26",BLACK,RED);
LCD_write_english_string(20,76,"Atmega32 & ILI9325 FOR OV7660 REV2.0",BLACK,RED);
delay_ms(10000);
LCD_write_english_string(20,96,"OV7660 Init......",BLACK,RED);
while(1!=OV7660_init());//初始化ov7660
LCD_write_english_string(20,96,"OV7660 Init 0K ",BLACK,RED);
delay_ms(10000);
LCD_Clear(RED);
DATA_INPUT();
Init_INT0();
/**/
while(1)
{
}
}
uint8_t noinline input_nibble(uint8_t rs, uint8_t en)
{
/* configure data pins as input */
DATA_INPUT();
/* set write bit */
PIN_SET(HD44780_RW);
/* set rs, if given */
PIN_CLEAR(HD44780_RS);
if (rs)
PIN_SET(HD44780_RS);
uint8_t data = clock_read(en);
/* reconfigure data pins as output */
DATA_OUTPUT();
/* delete RW bit */
PIN_CLEAR(HD44780_RW);
return data;
}
__interrupt void USI_TXRX (void)
{
if (START_ISSUED)
{
ChangeState(HANDLE_START_BIT);
}
switch(state)
{
case HANDLE_START_BIT:
ChangeState(HANDLE_ADDRESS_AND_READ_WRITE);
DATA_INPUT();
set_bits_remaining(8);
CLEAR_START();
break;
case HANDLE_ADDRESS_AND_READ_WRITE:
if ((DATA_BUFFER & ADDRESS_MASK) == current_address)
{
read = DATA_BUFFER & READ_BIT;
ChangeState(HANDLE_ADDRESS_ACK);
DATA_OUTPUT();
DATA_BUFFER = DATA_ACK;
set_bits_remaining(1);
}
else // address did not match
{
DATA_INPUT();
// TODO: should we just ignore bad addresses?
//DATA_BUFFER = DATA_NACK; // Send NAck
ChangeState(IDLE);
}
break;
case HANDLE_ADDRESS_ACK:
if (read)
{
ChangeState(HANDLE_DATA_READ);
DATA_OUTPUT();
if (reg == I2C_ADDR_ADDRESS)
{
DATA_BUFFER = current_address;
}
else if (reg == I2C_ADDR_TYPE)
{
DATA_BUFFER = device_type;
}
else if (reg == I2C_ADDR_NUM_READ_ENDPOINTS)
{
DATA_BUFFER = GetNumReadEndpoints();
}
else if (reg == I2C_ADDR_START_READ_ENDPOINTS)
{
DATA_BUFFER = READ_ENDPOINTS_START;
}
else if (reg == I2C_ADDR_NUM_WRITE_ENDPOINTS)
{
DATA_BUFFER = GetNumWriteEndpoints();
}
else if (reg == I2C_ADDR_START_WRITE_ENDPOINTS)
{
DATA_BUFFER = WRITE_ENDPOINTS_START;
}
else if (reg >= READ_ENDPOINTS_START && reg < READ_ENDPOINTS_START + GetNumReadEndpoints())
{
DATA_BUFFER = GetReadEndpoint(reg - READ_ENDPOINTS_START);
}
else
{
// todo: this should nack as well I think - KSH
DATA_BUFFER = 0x00;
}
set_bits_remaining(8);
}
else
{
ChangeState(HANDLE_REGISTER);
DATA_INPUT();
set_bits_remaining(8);
}
break;
case HANDLE_REGISTER:
reg = DATA_BUFFER;
ChangeState(HANDLE_REGISTER_ACK);
DATA_OUTPUT();
DATA_BUFFER = DATA_ACK;
set_bits_remaining(1);
break;
case HANDLE_REGISTER_ACK:
ChangeState(HANDLE_DATA_WRITTEN);
DATA_INPUT();
set_bits_remaining(8);
break;
case HANDLE_DATA_READ:
ChangeState(HANDLE_DATA_ACK);
DATA_OUTPUT();
DATA_BUFFER = DATA_ACK;
set_bits_remaining(1);
break;
case HANDLE_DATA_WRITTEN:
ChangeState(HANDLE_DATA_ACK);
DATA_OUTPUT();
if (reg == I2C_ADDR_ADDRESS)
{
// todo: find a way to store this in NVRAM
current_address = DATA_BUFFER;
}
else if (reg >= WRITE_ENDPOINTS_START && reg < WRITE_ENDPOINTS_START + GetNumWriteEndpoints())
{
SetWriteEndpoint(reg - WRITE_ENDPOINTS_START, DATA_BUFFER);
}
else
{
DATA_BUFFER = DATA_NACK;
set_bits_remaining(1);
break;
}
DATA_BUFFER = DATA_ACK;
set_bits_remaining(1);
break;
case HANDLE_DATA_ACK:
DATA_INPUT();
ChangeState(IDLE);
break;
default:
break;
}
CLEAR_INT();
}
