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#include "stm32.h"
#include "rcc.h"
#include "interrupt.h"
#include "thread.h"
#include "time.h"
#include "pin.h"
#include "usb.h"
static Pin& led_green = PD12;
static Pin& led_yellow = PD13;
static Pin& led_red = PD14;
static Pin& led_blue = PD15;
static Pin& usb_dm = PA11;
static Pin& usb_dp = PA12;
static Pin& usb_vbus = PA9;
static Pin& jtag_tdo = PC3;
static Pin& jtag_tms = PC13;
static Pin& jtag_tck = PC14;
static Pin& jtag_tdi = PC15;
bool jtag_tick(bool tdi, bool tms) {
bool tdo = jtag_tdo.get();
jtag_tdi.set(tdi);
jtag_tms.set(tms);
jtag_tck.on();
for(uint32_t i = 0; i < 1000; i++) {
asm volatile("nop");
}
jtag_tck.off();
for(uint32_t i = 0; i < 1000; i++) {
asm volatile("nop");
}
return tdo;
}
void usb_write(uint32_t* bufp, uint32_t len) {
OTG_FS.dev_iep_reg[0].DIEPTSIZ = (1 << 19) | len;
// PKTCNT
OTG_FS.dev_iep_reg[0].DIEPCTL |= (1 << 31) | (1 << 26);
// EPENA CNAK
len = (len + 3) >> 2;
while(len--) {
OTG_FS.fifo = *bufp++;
}
}
uint32_t dev_desc[] = {0x02000112, 0x400000ff, 0x56781234, 0x00000000, 0x0100};
uint32_t conf_desc[] = {0x00090209, 0xc0000100, 0x00};
bool get_descriptor(uint16_t wValue, uint16_t wIndex, uint16_t wLength) {
switch(wValue) {
case 0x100:
usb_write(dev_desc, wLength);
return true;
case 0x200:
usb_write(conf_desc, wLength);
return true;
default:
return false;
}
}
bool set_address(uint16_t wValue, uint16_t wIndex, uint16_t wLength) {
OTG_FS.dev_reg.DCFG |= wValue << 4;
usb_write(0, 0);
return true;
}
bool jtag_shift(uint16_t wValue, uint16_t wIndex, uint16_t wLength) {
if(wLength > 16) {
return false;
}
uint32_t tdo = 0;
for(int16_t i = 0; i < wLength; i++) {
tdo |= jtag_tick(wValue & 1, wIndex & 1) ? 1 << i : 0;
wValue >>= 1;
wIndex >>= 1;
}
usb_write(&tdo, (wLength + 7) >> 3);
return true;
}
void handle_setup(const uint32_t* bufp) {
led_red.toggle();
uint8_t bmRequestType = bufp[0] & 0xff;
uint8_t bRequest = (bufp[0] >> 8) & 0xff;
uint16_t wValue = (bufp[0] >> 16) & 0xffff;
uint16_t wIndex = bufp[1] & 0xffff;
uint16_t wLength = (bufp[1] >> 16) & 0xffff;
// GET_DESCRIPTOR
if(bmRequestType == 0x80 && bRequest == 0x06) {
if(get_descriptor(wValue, wIndex, wLength)) {
return;
}
}
// SET_ADDRESS
if(bmRequestType == 0x00 && bRequest == 0x05) {
if(set_address(wValue, wIndex, wLength)) {
return;
}
}
// JTAG_SHIFT
if(bmRequestType == 0xc0 && bRequest == 0xff) {
if(jtag_shift(wValue, wIndex, wLength)) {
return;
}
}
OTG_FS.dev_iep_reg[0].DIEPCTL |= (1 << 21);
}
static uint32_t buf[16];
void handle_rxfifo() {
uint32_t status = OTG_FS.reg.GRXSTSP;
uint32_t len = (status & 0x7ff0) >> 6;
for(uint32_t i = 0; i < len; i++) {
buf[i] = OTG_FS.fifo;
}
//if(status == 0x000c0080) {
if((status & (0xf << 17)) == (0x4 << 17)) {
handle_setup(buf);
OTG_FS.dev_oep_reg[0].DOEPCTL |= (1 << 26);
}
}
template<>
void interrupt<(Interrupt::IRQ)67>() {
//led_red.toggle();
// USB reset.
if(OTG_FS.reg.GINTSTS & (1 << 12)) {
led_yellow.toggle();
OTG_FS.dev_oep_reg[0].DOEPCTL = (1 << 27);
OTG_FS.dev_reg.DAINTMSK = (1 << 16) | 1;
OTG_FS.dev_reg.DOEPMSK = (1 << 3) | 1;
OTG_FS.dev_reg.DIEPEMPMSK = (1 << 3) | 1;
OTG_FS.reg.GRXFSIZ = 256;
OTG_FS.reg.DIEPTXF0 = (64 << 16) | 256;
OTG_FS.dev_oep_reg[0].DOEPTSIZ = (3 << 29);
}
// OTG interrupt.
if(OTG_FS.reg.GINTSTS & (1 << 2)) {
led_blue.toggle();
OTG_FS.reg.GOTGINT = (1 << 2); // SEDET
}
// RxFIFO non-empty.
if(OTG_FS.reg.GINTSTS & (1 << 4)) {
handle_rxfifo();
}
OTG_FS.reg.GINTSTS = 0xffffffff;
}
int main() {
// Initialize system timer.
STK.LOAD = 168000000 / 8 / 1000; // 1000 Hz.
STK.CTRL = 0x03;
RCC.enable(RCC.GPIOA);
RCC.enable(RCC.GPIOB);
RCC.enable(RCC.GPIOC);
RCC.enable(RCC.GPIOD);
led_green.set_mode(Pin::Output);
led_yellow.set_mode(Pin::Output);
led_red.set_mode(Pin::Output);
led_blue.set_mode(Pin::Output);
led_red.off();
led_blue.off();
led_yellow.off();
jtag_tdi.set_mode(Pin::Output);
jtag_tms.set_mode(Pin::Output);
jtag_tck.set_mode(Pin::Output);
jtag_tdo.set_mode(Pin::Input);
usb_vbus.set_mode(Pin::AF);
usb_vbus.set_pull(Pin::PullNone);
usb_vbus.set_af(10);
usb_dm.set_mode(Pin::AF);
usb_dm.set_pull(Pin::PullNone);
usb_dm.set_af(10);
usb_dp.set_mode(Pin::AF);
usb_dp.set_pull(Pin::PullNone);
usb_dp.set_af(10);
RCC.enable(RCC.OTGFS);
Interrupt::enable((Interrupt::IRQ)67);
OTG_FS.reg.GAHBCFG = 1;
//OTG_FS.reg.GRSTCTL |= 1;
//while(OTG_FS.reg.GRSTCTL & 1);
//Time::sleep(10);
// USB configuration
OTG_FS.reg.GUSBCFG = (1 << 30) | (0xf << 10) | (0 << 9) | (0 << 8);
// FDMOD TRDT HNPCAP SRPCAP
// interrupt mask
OTG_FS.reg.GINTMSK = (1 << 13) | (1 << 12) | (1 << 11) | (1 << 10) | (1 << 3) | (1 << 2) | (1 << 1) | (1 << 4);
// ENUMDNEM USBRST USBSUSPM ESUSPM SOFM OTGINT MMISM
// device configuration
OTG_FS.dev_reg.DCFG = (1 << 2) | 3;
// NZLSOHSK DSPD
// core configuration
OTG_FS.reg.GCCFG = (1 << 19) | (1 << 16);
// VBUSBSEN PWRDWN
while(1) {
led_green.toggle();
Time::sleep(100);
}
}
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