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bit-bang test

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This commit is contained in:
Conor Patrick 2018-08-04 20:32:07 -04:00
parent d3648eba2e
commit 59370a43b0
1 changed files with 99 additions and 10 deletions
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109
efm32/src/nfc.c
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@ -207,6 +207,65 @@ typedef struct {
uint8_t rtype;
} NDEF;
#define PIN_SCL gpioPortA,4
#define PIN_SDA gpioPortF,3
#define SDA_WRITE(x) if (x) GPIO_PinOutSet(PIN_SDA); else GPIO_PinOutClear(PIN_SDA);
#define SCL_WRITE(x) if (x) GPIO_PinOutSet(PIN_SCL); else GPIO_PinOutClear(PIN_SCL);
void i2c_delay()
{
int i;
for (i = 0; i < 38*5; i++)
{
__asm("nop");
}
}
void i2c_start()
{
SDA_WRITE(0);
i2c_delay();
i2c_delay();
SCL_WRITE(0);
}
void i2c_end()
{
SCL_WRITE(1);
i2c_delay();
i2c_delay();
SDA_WRITE(1);
}
//
int i2c_write_byte(uint8_t byte)
{
uint8_t bit;
int i;
for(i = 0; i < 8; i++)
{
bit = (byte & 0x80) ? 1 : 0;
byte <<= 1;
SCL_WRITE(0);
SDA_WRITE(bit);
i2c_delay();
SCL_WRITE(1);
i2c_delay();
}
SCL_WRITE(0);
SDA_WRITE(1); // release
i2c_delay();
SCL_WRITE(1);
i2c_delay();
int ack = GPIO_PinInGet(PIN_SDA);
SCL_WRITE(0);
i2c_delay();
return ack;
}
void nfc_test()
{
uint8_t data[17];
@ -219,28 +278,58 @@ void nfc_test()
printf("-NFC test-\n");
GPIO_PinOutSet(PIN_SCL);
GPIO_PinOutSet(PIN_SDA);
delay(1);
printf("pins: %d %d\n",GPIO_PinInGet(PIN_SCL),GPIO_PinInGet(PIN_SDA));
delay(1);
GPIO_PinOutClear(PIN_SCL);
GPIO_PinOutClear(PIN_SDA);
delay(1);
printf("pins: %d %d\n",GPIO_PinInGet(PIN_SCL),GPIO_PinInGet(PIN_SDA));
GPIO_PinOutSet(PIN_SCL);
GPIO_PinOutSet(PIN_SDA);
delay(10);
GPIO_PinOutSet(NFC_DEV_SS);
delay(10);
GPIO_PinOutClear(NFC_DEV_SS);
delay(10);
read_reg_block(data);
i2c_start();
int ack = i2c_write_byte(0xA0);
i2c_end();
i2c_delay();
printf("regs:\n");
dump_hex(data,17);
int ack2 = GPIO_PinInGet(PIN_SDA);
while(1)
;
printf("ack:%d, release: %d\n", ack,ack2);
while (1)
{
delay(1090);
read_reg_block(data);
}
;
// delay(10);
// GPIO_PinOutClear(NFC_DEV_SS);
// delay(10);
return;
// read_reg_block(data);
//
// printf("regs:\n");
// dump_hex(data,17);
//
// while(1)
// ;
//
// while (1)
// {
// delay(1090);
// read_reg_block(data);
// }
//
//
// return;
////
////
// read_block(0x00, data);
// read_block(0x00, data);