jason-poul
   
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在這部分，
不管是使用 assembly / C 都應該不會有多少差異，
因為不會因為語法的不同而導致你的Uart不能動!!
一般使用到RS-232(即Uart)，
則會有Baud Rate的問題，
要先設好Buad Rate(看你是使用9600/14400/19200/38400/57600/115200... ...)，
接者就要看你的datasheet，
你可以到那家廠商的網站下載sampo code，
一般就uart的部分，
都有完整的sampo code。
我有一些code可以給你參考，
其餘就靠你努力了!!
#define Uart_19200 0xEE // 19200 Bps, At 11.0592 Meg.
#define Uart_38400 0xF7 // 38400 Bps, At 11.0592 Meg.
#define Uart_57600 0xFA // 57600 Bps, At 11.0592 Meg.
#define Uart_115200 0xFD // 115200 Bps, At 11.0592 Meg
// Name : Uart_Select_Baud_Rate
// US_Baud_Rate. (Can Be Uart_19200/Uart_38400/Uart_57600/Uart_115200)
void Uart_Select(unsigned char US_Baud_Rate)
{
T2CON = 0x34; // 0011 1000,
// TF2 = 0, EXF2 = 0, RCLK = 1, TCLK = 1,
// EXEN2 = 1, TR2 = 0, C/T2 = 0, CP/RL2 = 0.
TL2 = US_Baud_Rate; // Set Count.
TH2 = 0xFF; // Set Up Count.
RCAP2L = US_Baud_Rate; // Set Count.
RCAP2H = 0xFF; // Set Up Count.
SCON = 0x50; // 0101 0000,
// SM0 = 0, SM1 = 1 (8 BIT VARIABLE), SM2 = 0 (NO MULTIMODE), REN = 1 (SERIAL RECEPTION),
// TB8 = 0, RB8 = 0, TI = 0, RI = 0.
ES = 1; // Enable Uart Interrupt.
EA = 1; // Global Int Enable.
TR2 = 1; // Timer 2 Enable.
}
// Local Variable Definition
#define Receive_Buffer_Size 128 // Receive Buffer Size. (0 - 255)
bit Receive_Get = 0;
unsigned char xdata Receive_Buffer_Index = 0;
unsigned char xdata Receive_Buffer[Receive_Buffer_Size] = {0}; // Receive_Buffer.
// Name : Uart_Interrupt
void Uart_Interrupt(void) interrupt 4
{
if (RI == 1)
{
if (Receive_Get == 0) // If Receive_Buffer Not Full.
{
if ((SBUF >= 0x21) && (SBUF <= 0x7E)) // Only ASCII From 0x21 To 0x7E Into Receive_Buffer.
{
Receive_Buffer[Receive_Buffer_Index] = SBUF;
Receive_Buffer_Index++;
if (Receive_Buffer_Index == Receive_Buffer_Size)
Receive_Get = 1;
}
}
RI = 0; // Clear RI (Receive Interrupt).
}
if (TI == 1)
{
Transmit_Busy = 0; // Mark Transmit Not Busy.
TI = 0; // Clear TI (Transmit Interrupt).
}
}
[ 此文章被jason-poul在2009-05-10 01:00重新編輯 ]
此文章被評分,最近評分記錄| 財富:20 (by 三仙) | 理由: 因為您的參與，讓程式設計更容易!! | |
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