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#include <rcc/flash.h>
#include <rcc/rcc.h>
#include <rcc/crs.h>
#include <syscfg/syscfg.h>
#include <gpio/gpio.h>
#include <os/time.h>
#include <spi/spi.h>
#include <usb/usb.h>
#include <usb/descriptor.h>
auto dev_desc = device_desc(0x200, 0, 0, 0, 64, 0x1d50, 0x60f8, 0, 0, 0, 0, 1);
auto conf_desc = configuration_desc(2, 1, 0, 0xc0, 0,
interface_desc(1, 0, 1, 0xff, 0x00, 0x00, 0,
endpoint_desc(0x81, 0x02, 64, 0)
),
interface_desc(2, 0, 1, 0xff, 0x00, 0x00, 0,
endpoint_desc(0x82, 0x03, 64, 0)
)
);
desc_t dev_desc_p = {sizeof(dev_desc), (void*)&dev_desc};
desc_t conf_desc_p = {sizeof(conf_desc), (void*)&conf_desc};
USB_l0 usb(USB, dev_desc_p, conf_desc_p);
Pin nfc_sck = GPIOB[3];
Pin nfc_miso = GPIOB[4];
Pin nfc_mosi = GPIOB[5];
Pin nfc_ss = GPIOB[6];
Pin nfc_irq_out = GPIOB[7];
Pin nfc_irq_in = GPIOC[13];
Pin button = GPIOA[3];
Pin led = GPIOA[4];
PinArray kp_rows = GPIOB.array(12, 15);
PinArray kp_cols = GPIOA.array(8, 10);
class CR95HF {
private:
SPI_t& spi;
Pin& ss;
public:
CR95HF(SPI_t& spi_bus, Pin& p) : spi(spi_bus), ss(p) {}
void send_cmd(uint8_t cmd, uint32_t len, uint8_t* buf) {
ss.off();
spi.transfer_byte(0);
spi.transfer_byte(cmd);
spi.transfer_byte(len);
while(len--) {
spi.transfer_byte(*buf++);
}
ss.on();
}
uint32_t get_response(uint32_t maxlen, uint8_t* buf) {
uint32_t len = 0;
while(nfc_irq_out.get());
ss.off();
spi.transfer_byte(2);
*buf++ = spi.transfer_byte();
len++;
uint32_t datalen = spi.transfer_byte();
*buf++ = datalen;
len++;
while(len < datalen + 2) {
*buf++ = spi.transfer_byte();
len++;
}
ss.on();
return len;
}
};
CR95HF cr95hf(SPI1, nfc_ss);
class USB_NFC : public USB_class_driver {
private:
USB_generic& usb;
public:
USB_NFC(USB_generic& usbd) : usb(usbd) {
usb.register_driver(this);
}
protected:
virtual void handle_set_configuration(uint8_t configuration) {
if(configuration) {
usb.hw_conf_ep(0x81, EPType::Bulk, 64);
}
}
};
USB_NFC usb_nfc(usb);
class USB_keypad : public USB_class_driver {
private:
USB_generic& usb;
public:
USB_keypad(USB_generic& usbd) : usb(usbd) {
usb.register_driver(this);
}
protected:
virtual void handle_set_configuration(uint8_t configuration) {
if(configuration) {
usb.hw_conf_ep(0x82, EPType::Interrupt, 64);
}
}
};
USB_keypad usb_keypad(usb);
int main() {
rcc_init();
// Initialize system timer.
STK.LOAD = 32000000 / 8 / 1000; // 1000 Hz.
STK.VAL = 0;
STK.CTRL = 0x03;
// Enable CRS.
RCC.enable(RCC.CRS);
CRS.enable();
RCC.enable(RCC.GPIOA);
RCC.enable(RCC.GPIOB);
RCC.enable(RCC.GPIOC);
led.set_mode(Pin::Output);
RCC.enable(RCC.USB);
usb.init();
Time::sleep(10);
USB.reg.BCDR |= 1 << 15;
RCC.enable(RCC.SPI1);
nfc_irq_out.set_mode(Pin::Input);
nfc_irq_in.on();
nfc_irq_in.set_mode(Pin::Output);
nfc_ss.on();
nfc_ss.set_mode(Pin::Output);
nfc_sck.set_speed(Pin::High);
nfc_sck.set_mode(Pin::AF);
nfc_miso.set_mode(Pin::AF);
nfc_mosi.set_mode(Pin::AF);
SPI1.reg.CR1 = (1 << 9) | (1 << 8) | (1 << 6) | (4 << 3) | (1 << 2) | (0 << 1) | (0 << 0); // SSM, SSI, SPE, 36/32MHz, MSTR, CPOL=0, CPHA=0
SPI1.reg.CR2 = (1 << 12) | (7 << 8); // FRXTH, DS = 8bit
Time::sleep(1);
nfc_irq_in.off();
Time::sleep(1);
nfc_irq_in.on();
Time::sleep(1);
uint8_t buf[64];
bool cmd_sent = false;
uint32_t nfc_delay_until = 0;
uint8_t bulk_buf[8];
Time::sleep(1000);
cr95hf.send_cmd(0x02, 2, (uint8_t*)"\x01\x05"); // Select ISO 15693
cr95hf.get_response(64, buf);
kp_cols.set_mode(Pin::Input);
kp_cols.set_pull(Pin::PullUp);
kp_rows.set_type(Pin::OpenDrain);
kp_rows.set_mode(Pin::Output);
uint32_t kp_last = 0;
while(1) {
if(Time::time() < nfc_delay_until) {
// Just do nothing.
} else if(!cmd_sent) {
led.off();
cr95hf.send_cmd(0x04, 3, (uint8_t*)"\x26\x01\x00"); // INVENTORY
cmd_sent = true;
} else if(!nfc_irq_out.get()) {
cr95hf.get_response(64, buf);
cmd_sent = false;
if(buf[0] == 128 && buf[14] == 0) {
led.on();
uint8_t* id_raw = &buf[11];
uint8_t* id_buf = bulk_buf;
for(uint32_t i = 0; i < 8; i++) {
*id_buf++ = *id_raw--;
}
if(usb.ep_ready(1)) {
usb.write(1, (uint32_t*)bulk_buf, sizeof(bulk_buf));
}
nfc_delay_until = Time::time() + 5000; // Valid for five seconds.
} else {
nfc_delay_until = Time::time() + 100; // Retry in 100ms.
}
}
uint32_t kp_state = 0;
for(int i = 0; i < 4; i++) {
kp_rows.set(~(1 << i));
asm volatile("dmb");
asm volatile("nop");
asm volatile("nop");
asm volatile("nop");
asm volatile("nop");
kp_state |= ((~kp_cols.get()) & 0x7) << (i * 3);
}
if(kp_state != kp_last && usb.ep_ready(2)) {
usb.write(2, &kp_state, 2);
kp_last = kp_state;
}
usb.process();
}
}
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