元旦放假，急于趕一個小項(xiàng)目，做了一個M0516LAN驅(qū)動SIM900A的測試。第一次用SIM900A，其中遇到幾個小問題，調(diào)了好久，也問過群里用過SIM900A的幾位朋友才調(diào)通，在此感謝。最弱智的問題是我把NRESET接到了PWM3上，然后又啟動了PWM3，雖然后面把P43置成IO輸出卻不成功，然后大半晚上就那么悲劇掉了。新唐的庫是置成了復(fù)用功能再想置回IO，需要先DrvGPIO_InitFunction(E_FUNC_GPIO);才能配置IO功能的。我后來還是不啟動PWM就通過了開機(jī)過程。只要SIM900A開機(jī)了，NETLIGHT的LED就會閃爍，不管有沒有SIM卡。另外，所有SIM900A的AT命令都是以“”結(jié)束的。

“sim900a.c ”文件源碼如下：

#include
#include

#include "DriverDrvUART.h"
#include "DriverDrvGPIO.h"
#include "DriverDrvSYS.h"

#define PWRKEY E_PORT2, E_PIN1
#define NRESETE_PORT4, E_PIN3
#define STATUS E_PORT2, E_PIN3
#define RIE_PORT3, E_PIN2
#define CTSE_PORT0, E_PIN0
/*
_________________________________________________
|M0516LANSIM900A|
||
|P21PWRKEY---->PWRKEY|
|P43NRESET---->NRESET|
|P23STATUS<----STATUS|
|P32RI<----RI|
|P00CTS1<----CTS|
|P13TXD1---->RXD|
|P12RXD1<----TXD|
|_______________________________________________|
*/
int UART1_init(void)
{
STR_UART_T sParam;

/* Set UART1 Pin */
DrvGPIO_InitFunction(E_FUNC_UART1);
//outpw(&SYS->P1_MFP, (inpw(&SYS->P1_MFP) | (0x3<<10)) & ~(0x3<<2));
//outpw(&SYS->P0_MFP, (inpw(&SYS->P0_MFP) | (0x3<<8)) & ~(0x3<<0));

/* Select UART1 Clock Source From 12Mhz*/
DrvSYS_SelectIPClockSource(E_SYS_UART_CLKSRC,0);

/* UART1 Setting */
sParam.u32BaudRate = 9600;
sParam.u8cDataBits = DRVUART_DATABITS_8;
sParam.u8cStopBits = DRVUART_STOPBITS_1;
sParam.u8cParity = DRVUART_PARITY_NONE;
sParam.u8cRxTriggerLevel= DRVUART_FIFO_1BYTES;

if(DrvUART_Open(UART_PORT1,&sParam) != E_SUCCESS)
{
printf("UART1 open failed");
return FALSE;
}
/* Enable Interrupt and install the call back function */
//DrvUART_EnableInt(UART_PORT1, (DRVUART_RLSINT | DRVUART_RDAINT),UART1_INT_HANDLE);

/* Disable Interrupt */
//DrvUART_DisableInt(UART_PORT1,DRVUART_RLSINT | DRVUART_THREINT | DRVUART_RDAINT);

return TRUE;
}

int SIM900A_Open(void)
{
int dly;

DrvGPIO_ClrBit(PWRKEY);
for(dly=0;dly<2000;dly++)DrvSYS_Delay(1000); //delay 1S
DrvGPIO_SetBit(PWRKEY);

for(dly=0;dly<3000;dly++)DrvSYS_Delay(1000); //delay 3S
if(DrvGPIO_GetBit(STATUS))
{
printf("SIM900A Open Success!!!");
return 1;
}
else
{
printf("SIM900A Open Failure!!!");
return 0;
}
}

int SIM900A_Close(void)
{
int dly;

DrvGPIO_ClrBit(PWRKEY);
for(dly=0;dly<6000;dly++)DrvSYS_Delay(1000); //delay 1S-5S
DrvGPIO_SetBit(PWRKEY);

for(dly=0;dly<4000;dly++)DrvSYS_Delay(1000); //delay 2S

if(DrvGPIO_GetBit(STATUS))
{
printf("SIM900A Close Failure!!!");
return 1;
}
else
{
printf("SIM900A Close Success!!!");
return 0;
}
}

int SIM900A_Reset(void)
{
int dly;

DrvGPIO_ClrBit(NRESET);
DrvSYS_Delay(100); //delay 20uS-50uS
DrvGPIO_SetBit(NRESET);

for(dly=0;dly<2000;dly++)DrvSYS_Delay(1000); //delay 2S
if(DrvGPIO_GetBit(STATUS)==1)
return 1;
else
return 0;
}
int SIM900A_init(void)
{
int ret =0;

DrvGPIO_Open(STATUS, E_IO_INPUT);
DrvGPIO_Open(RI, E_IO_INPUT);
DrvGPIO_Open(CTS, E_IO_INPUT);
DrvGPIO_Open(PWRKEY, E_IO_OUTPUT);
DrvGPIO_Open(NRESET, E_IO_OUTPUT);

DrvGPIO_SetBit(PWRKEY);
DrvGPIO_SetBit(NRESET);

ret = SIM900A_Open();
UART1_init();

return ret;
}