void start()
{
//Colocar SCL e SDA activos
GPIO_Set(SDA|SCL);
wait();
//Provoca a transicao descendente a SDA para dar a Sequencia de START
GPIO_Clr(SDA);
wait();
//baixa o SCL para ficarem ambos iguais
GPIO_Clr(SCL);
}
void giveClk()
{
wait();
GPIO_Set(SCL);
wait();
GPIO_Clr(SCL);
}
void stop()
{
GPIO_Clr(SDA|SCL);
wait();
GPIO_Set(SDA);
wait();
}
readByte(char *byte, int lastbyte)
{
int idx;
*byte = 0x0;
for(idx=7 ; idx >= 0 ; --idx)
{
GPIO_Set(SDA);
wait();
GPIO_Set(SCL);
wait();
char cs = (GPIO_Read()&SDA)>>SDA_OFFSET;
char myByte = ((GPIO_Read()&SDA)>>SDA_OFFSET)<<idx;
*byte |= ((GPIO_Read()&SDA)>>SDA_OFFSET)<<idx;
GPIO_Clr(SCL);
}
if(lastbyte == 1)
GPIO_Set(SDA);//NACK
else
GPIO_Clr(SDA);//ACK
giveClk();
}
int main()
{
GPIO_Init(0x0001);
while(1)
{
int i;
GPIO_Set(0x0001);
for(i = 0; i < 1024 *2; ++i);
GPIO_Clr(0x0001);
for(i = 0; i < 1024 *2; ++i);
}
}
unsigned int writeByte(char *byte)
{
int idx, count;
count = 0;
do{
for(idx=7 ; idx >= 0 ; idx--)
{
int c = ((*byte)>>idx)&0x1;
if(c==1)
GPIO_Set(SDA);
else
GPIO_Clr(SDA);
giveClk();
}
giveClk();
++count;
}while((count <= MAX_SEND) &&(GPIO_Read()&SDA == 0)); //Verifica se ainda é NACK, enquanto for tenta enviar os dados
//if(GPIO_Read()&SDA != 0) return 1; //Faz read ao ACK que vem do dispositivo para garantir que recebeu bem os dados
if(count > MAX_SEND) return -1;
return 1;
}
void GPIO_WriteMask(unsigned int maskbit, unsigned int value)
{
GPIO_Clr(maskbit);
GPIO_Set(value);
}
void GPIO_Write(unsigned int value)
{
GPIO_Clr(0xFFFF);
GPIO_Set(value);
}
int main(void)
{
int32_t i32Err;
sysDisableCache();
sysFlushCache(I_D_CACHE);
sysEnableCache(CACHE_WRITE_BACK);
sysInitializeUART();
sysprintf("+-------------------------------------------------+\n");
sysprintf("| GPIO Sample Code |\n");
sysprintf("+-------------------------------------------------+\n\n");
/* Configure Port C to input mode and pull-up */
GPIO_Open(GPIOC, DIR_INPUT, PULL_UP);
/* Set Port C output data to 0xFFF */
GPIO_Set(GPIOC, 0xFFF);
/* Set Port C output data to 0x000 */
GPIO_Clr(GPIOC, 0xFFF);
/* Configure Port C to default value */
GPIO_Close(GPIOC);
i32Err = 0;
sysprintf("GPIO PD.3(output mode) connect to PD.4(input mode) ......");
/* Configure PD3 to output mode */
GPIO_OpenBit(GPIOD, BIT3, DIR_OUTPUT, NO_PULL_UP);
/* Configure PD4 to output mode */
GPIO_OpenBit(GPIOD, BIT4, DIR_INPUT, NO_PULL_UP);
/* Use Pin Data Input/Output Control to pull specified I/O or get I/O pin status */
/* Pull PD.3 to High and check PD.4 status */
GPIO_SetBit(GPIOD, BIT3);
if(GPIO_ReadBit(GPIOD,BIT4)==0)
i32Err = 1;
/* Pull PD.3 to Low and check PD.4 status */
GPIO_ClrBit(GPIOD, BIT3);
if(GPIO_ReadBit(GPIOD,BIT4)==1)
i32Err = 1;
if(i32Err)
{
sysprintf(" [FAIL].\n");
}
else
{
sysprintf(" [OK].\n");
}
/* Configure PD3 to default value */
GPIO_CloseBit(GPIOD, BIT3);
/* Configure PD4 to default value */
GPIO_CloseBit(GPIOD, BIT3);
/* Set MFP_GPF11 to EINT0 */
outpw(REG_SYS_GPF_MFPH,(inpw(REG_SYS_GPF_MFPH) & ~(0xF<<12)) | (0xF<<12));
/* Configure PF11 to input mode and pull-up */
GPIO_OpenBit(GPIOF, BIT11, DIR_INPUT, PULL_UP);
/* Confingure PF11 to rising-edge trigger */
GPIO_EnableTriggerType(GPIOF, BIT11,RISING);
/* Enable external 0 interrupt */
GPIO_EnableEINT(NIRQ0, (GPIO_CALLBACK)EINT0Callback, 0);
/* waiting for external 0 interrupt */
sysprintf("waiting for PF11 rsing-edge trigger...");
while(!eint_complete);
/* Disable PF11 trigger type */
GPIO_DisableTriggerType(GPIOF, BIT11);
/* Enable external 0 interrupt */
GPIO_DisableEINT(NIRQ0);
sysprintf(" [OK].\n");
/* Configure PF11 to default value */
GPIO_CloseBit(GPIOF, BIT11);
/* Configure PE3 to output mode */
GPIO_OpenBit(GPIOE, BIT3, DIR_INPUT, NO_PULL_UP);
/* Confingure PE3 to falling-edge trigger */
GPIO_EnableTriggerType(GPIOE, BIT3,FALLING);
/* Enable GPIOE interrupt */
GPIO_EnableInt(GPIOE, (GPIO_CALLBACK)GPIOECallback, 0);
/* waiting for external 0 interrupt */
sysprintf("waiting for PE3 falling-edge trigger...");
while(!gpio_complete);
/* Disable PE3 to trigger type */
GPIO_DisableTriggerType(GPIOE, BIT3);
/* Disable GPIOE interrupt */
GPIO_DisableInt(GPIOE);
/* Configure PE0 to default value */
GPIO_CloseBit(GPIOE, BIT3);
sysprintf(" [OK].\n");
while(1);
}
