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responds to RATS correctly

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This commit is contained in:
Conor Patrick
2019-01-12 20:20:47 -05:00
parent 62cd7cc728
commit 302ce75ce6
5 changed files with 140 additions and 26 deletions
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142
targets/stm32l432/src/nfc.c
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@ -10,6 +10,12 @@
#define SELECT() LL_GPIO_ResetOutputPin(SOLO_AMS_CS_PORT,SOLO_AMS_CS_PIN)
#define UNSELECT() LL_GPIO_SetOutputPin(SOLO_AMS_CS_PORT,SOLO_AMS_CS_PIN)
static struct
{
uint8_t max_frame_size;
uint8_t cid;
} NFC_STATE;
static void flush_rx()
{
@ -125,6 +131,19 @@ void ams_read_buffer(uint8_t * data, int len)
SELECT();
}
void ams_write_buffer(uint8_t * data, int len)
{
int i;
send_recv(0x80);
while(len--)
{
send_recv(*data++);
}
UNSELECT();
SELECT();
}
// data must be 4 bytes
void ams_read_eeprom_block(uint8_t block, uint8_t * data)
{
@ -251,6 +270,10 @@ void ams_print_int1(uint8_t int0)
void nfc_init()
{
uint8_t block[4];
memset(&NFC_STATE,0,sizeof(NFC_STATE));
NFC_STATE.max_frame_size = 32;
LL_GPIO_SetPinMode(SOLO_AMS_CS_PORT,SOLO_AMS_CS_PIN,LL_GPIO_MODE_OUTPUT);
LL_GPIO_SetOutputPin(SOLO_AMS_CS_PORT,SOLO_AMS_CS_PIN);
@ -279,15 +302,37 @@ void nfc_init()
ams_read_eeprom_block(AMS_CONFIG_BLOCK0_ADDR, block);
printf1(TAG_NFC,"conf0: "); dump_hex1(TAG_NFC,block,4);
uint8_t sense1 = 0x44;
uint8_t sense2 = 0x00;
uint8_t selr = 0x20; // SAK
if(block[0] != sense1 || block[1] != sense2 || block[2] != selr)
{
printf1(TAG_NFC,"Writing config block 0\r\n");
block[0] = sense1;
block[1] = sense2;
block[2] = selr;
block[3] = 0x00;
ams_write_eeprom_block(AMS_CONFIG_BLOCK0_ADDR, block);
UNSELECT();
delay(10);
SELECT();
delay(10);
ams_read_eeprom_block(AMS_CONFIG_BLOCK0_ADDR, block);
printf1(TAG_NFC,"conf0: "); dump_hex1(TAG_NFC,block,4);
}
ams_read_eeprom_block(AMS_CONFIG_BLOCK1_ADDR, block);
printf1(TAG_NFC,"conf1: "); dump_hex1(TAG_NFC,block,4);
uint8_t ic_cfg1 = AMS_CFG1_OUTPUT_RESISTANCE_100 | AMS_CFG1_VOLTAGE_LEVEL_2V0;
uint8_t ic_cfg2 = AMS_CFG2_RFCFG_EN | AMS_CFG2_TUN_MOD;
uint8_t ic_cfg2 = AMS_CFG2_TUN_MOD;
if (block[0] != ic_cfg1 || block[1] != ic_cfg2)
{
printf1(TAG_NFC,"Writing...\r\n");
printf1(TAG_NFC,"Writing config block 1\r\n");
// set IC_CFG1
block[0] = ic_cfg1;
@ -298,11 +343,58 @@ void nfc_init()
block[2] = 0x80;
block[3] = 0;
ams_write_eeprom_block(0x7F, block);
ams_write_eeprom_block(AMS_CONFIG_BLOCK1_ADDR, block);
UNSELECT();
delay(10);
SELECT();
delay(10);
ams_read_eeprom_block(0x7F, block);
printf1(TAG_NFC,"conf1: "); dump_hex1(TAG_NFC,block,4);
}
ams_read_eeprom_block(0x7F, block);
printf1(TAG_NFC,"conf1: "); dump_hex1(TAG_NFC,block,4);
}
void nfc_write_frame(uint8_t * data, uint8_t len)
{
if (len > 32)
{
len = 32;
}
ams_write_command(AMS_CMD_CLEAR_BUFFER);
ams_write_buffer(data,len);
ams_write_command(AMS_CMD_TRANSMIT_BUFFER);
}
int answer_rats(RATS_REQUEST * rats)
{
if (rats->start != 0xE0)
{
printf1(TAG_ERR, "Not a RATS request. Ignoring.\r\n");
return 1;
}
uint8_t fsdi = (rats->parameter & 0xf0) >> 4;
uint8_t cid = (rats->parameter & 0x0f);
// printf1(TAG_NFC, "fsdi: %x\r\n",fsdi);
// printf1(TAG_NFC, "cid: %x\r\n",cid);
if (fsdi == 0)
NFC_STATE.max_frame_size = 16;
else if (fsdi == 1)
NFC_STATE.max_frame_size = 24;
else
NFC_STATE.max_frame_size = 32;
uint8_t res[2];
res[0] = 2;
res[1] = 2; // 2 FSCI == 32 byte frame size
nfc_write_frame(res,2);
return 0;
}
void nfc_loop()
@ -310,30 +402,39 @@ void nfc_loop()
const uint32_t interval = 200;
static uint32_t t1 = 0;
static uint32_t c = 0;
uint8_t buf[32];
AMS_DEVICE ams,ams2;
int len = 0;
uint8_t def[] = "\x00\x00\x05\x40\x00\x00\x00\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x14\x02\x01\x00";
// if (millis() - t1 > interval)
if (0)
if (1)
{
t1 = millis();
read_reg_block(&ams);
printf1(TAG_NFC,"regs: "); dump_hex1(TAG_NFC,ams.buf,sizeof(AMS_DEVICE));
// if (memcmp(def,ams.buf,sizeof(AMS_DEVICE)) != 0)
// {
// printf1(TAG_NFC,"regs: "); dump_hex1(TAG_NFC,ams.buf,sizeof(AMS_DEVICE));
// }
if (ams.regs.rfid_status)
{
printf1(TAG_NFC," %s\r\n", ams_get_state_string(ams.regs.rfid_status));
uint8_t state = AMS_STATE_MASK & ams.regs.rfid_status;
// if (state != AMS_STATE_SENSE)
// printf1(TAG_NFC," %s %d\r\n", ams_get_state_string(ams.regs.rfid_status), millis());
}
if (ams.regs.int0)
{
ams_print_int0(ams.regs.int0);
// ams_print_int0(ams.regs.int0);
if (ams.regs.int0 & AMS_INT_XRF)
{
printf1(TAG_NFC," %d\r\n", millis());
}
}
if (ams.regs.int1)
{
ams_print_int1(ams.regs.int1);
// ams_print_int1(ams.regs.int1);
}
if (ams.regs.buffer_status2)
if (ams.regs.buffer_status2 && (ams.regs.int0 & AMS_INT_RXE))
{
if (ams.regs.buffer_status2 & AMS_BUF_INVALID)
{
@ -342,14 +443,21 @@ void nfc_loop()
else
{
len = ams.regs.buffer_status2 & AMS_BUF_LEN_MASK;
printf1(TAG_NFC,"%d bytes in buffer\r\n", len);
ams_read_buffer(buf, len);
dump_hex1(TAG_NFC, buf, len);
// printf1(TAG_NFC,"%d bytes in buffer\r\n", len);
// dump_hex1(TAG_NFC, buf, len);
}
}
// ams_print_device( &ams);
if (len)
{
// printf1(TAG_NFC,"RATS %d\r\n",c++);
// ams_write_command(AMS_CMD_TRANSMIT_ACK);
t1 = millis();
answer_rats((RATS_REQUEST*)buf);
printf1(TAG_NFC,"RATS answered %d (took %d)\r\n",millis(), millis() - t1);
}
}
}