//UART0 initialize
// desired baud rate: 2400
// actual: baud rate:2404 (0.2%)
// char size: 8 bit
// parity: Disabled
void uart0_init(void)
{
UCSRB = 0x00; //disable while setting baud rate
UCSRA = 0x00;
UBRRL = 0x19; //set baud rate lo
UBRRH = 0x00; //set baud rate hi
//UCSRB = 0xD8;
UCSRB = (1 << RXCIE) | (1 << TXCIE) | (1 << RXEN) | (1 << TXEN);
UCSRC = BIT(URSEL) | 0x06;
}
//------------------------------------------------------------------------------
#pragma interrupt_handler uart0_rx_isr:12
void uart0_rx_isr(void)
{
//uart has received a character in UDR
PutUartRx(UDR);//中数接收就OK!
}
//==============================================================================
//------------------------------------------------------------------------------
unsigned char a = 1;
#pragma interrupt_handler uart0_tx_isr:14
void uart0_tx_isr(void)
{
//character has been transmitted
UDR = a; //这样发送数据错在哪里?串口助手收不到数据,
}
//==============================================================================
void main(void)
{
init_devices();
while(1)
{
//putchar(a);这样查询发数就没有问题
}
}
请各位AVR高手帮忙,谢谢...
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