bstanwell/wch-uf2-example
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linux *sometimes* reads device desc

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R
2024-04-13 01:49:49 +01:00
parent 8a66c040ca
commit ede5875016
1 changed files with 84 additions and 8 deletions
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bootloader.c
+83 -7
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@@ -24,7 +24,24 @@ typedef struct USBD_descriptor {
// +0x200
// <256-byte flash page buffer>
#define USB_DESCS ((USBD_descriptor*)0x40006000)
const uint8_t USB_DEV_DESC[18] __attribute__((aligned(16))) = {
18, // bLength
1, // bDescriptorType
0x00, 0x02, // bcdUSB
0xff, // bDeviceClass
0xff, // bDeviceSubClass
0xff, // bDeviceProtocol
8, // bMaxPacketSize0
0x55, 0xf0, // idVendor
0x00, 0x00, // idProduct
0x00, 0x00, // bcdDevice
0, // iManufacturer
0, // iProduct
0, // iSerialNumber
1, // bNumConfigurations
};
#define USB_DESCS ((volatile USBD_descriptor*)0x40006000)
#define USB_EP0_OUT(offs) (*(volatile uint32_t *)(0x40006020 + 2 * (offs)))
#define USB_EP0_IN(offs) (*(volatile uint32_t *)(0x40006030 + 2 * (offs)))
#define USB_EP1_OUT(offs) (*(volatile uint32_t *)(0x40006040 + 2 * (offs)))
@@ -45,6 +62,13 @@ typedef struct USBD_descriptor {
#define R32_EXTEN_CTR (*(volatile uint32_t*)0x40023800)
// state[7:0] = addr
#define STATE_SET_ADDR 0x00
// state[15:8] = byte pos
// state[7:0] = bytes left
#define STATE_GET_DEV_DESC 0x01
#define STATE_CTRL_STATUS_OUT 0x02
int main(void) {
// PLL setup: system clock 96 MHz
R32_EXTEN_CTR |= (1 << 4); // sneaky div2
@@ -74,14 +98,15 @@ int main(void) {
R16_USBD_CNTR &= ~(1 << 0);
R32_EXTEN_CTR |= (1 << 1);
uint32_t need_to_set_addr = 0;
uint32_t master_state = 0;
// R32_GPIOA_CFGLR = (R32_GPIOA_CFGLR & ~0xf) | (0b0010 << 0);
while (1) {
uint32_t usb_int_status = R16_USBD_ISTR;
if (usb_int_status & (1 << 10)) {
// RESET
R16_USBD_EPR(0) = (0b11 << 12) | (0b01 << 9) | (0b01 << 4);
// set all to STALL, SETUP will come in nonetheless
R16_USBD_EPR(0) = (0b01 << 12) | (0b01 << 9) | (0b01 << 4);
R16_USBD_DADDR = 0x80;
} else if (usb_int_status & (1 << 15)) {
if ((usb_int_status & 0x1f) == 0x10) {
@@ -91,21 +116,72 @@ int main(void) {
uint16_t bRequest_bmRequestType = USB_EP0_OUT(0);
if (bRequest_bmRequestType == 0x0500) {
// SET_ADDRESS
need_to_set_addr = USB_EP0_OUT(2);
master_state = (STATE_SET_ADDR << 24) | USB_EP0_OUT(2);
USB_DESCS[0].count_tx = 0;
R16_USBD_EPR(0) = (0b01 << 9) | (0b11 << 12) | (0b01 << 4); // STALL for OUT, ACK for IN
} else if (bRequest_bmRequestType == 0x0680) {
// GET_DESCRIPTOR
uint32_t wValue = USB_EP0_OUT(2);
if (wValue == 0x0100) {
for (int i = 0; i < 8; i+=2)
USB_EP0_IN(i) = *((uint16_t*)(&USB_DEV_DESC[i]));
uint32_t bytes = USB_EP0_OUT(6);
if (bytes < 8) {
USB_DESCS[0].count_tx = bytes;
master_state = (STATE_GET_DEV_DESC << 24);
} else {
USB_DESCS[0].count_tx = 8;
master_state = (STATE_GET_DEV_DESC << 24) | (8 << 8) | (bytes - 8);
}
R16_USBD_EPR(0) = (0b01 << 9) | (0b11 << 12) | (0b01 << 4); // STALL for OUT, ACK for IN
} else {
// bad descriptor
while (1) {}
}
} else {
// unknown
R16_USBD_EPR(0) = (0b01 << 9) | (0b11 << 12) | (0b11 << 4); // STALL for both
while (1) {}
}
} else {
switch (master_state >> 24) {
case STATE_CTRL_STATUS_OUT:
// go back to STALL for OUT
R16_USBD_EPR(0) = (0b01 << 9) | (0b11 << 12);
break;
}
}
}
if ((usb_int_status & 0x1f) == 0x00) {
if (need_to_set_addr) {
R16_USBD_DADDR = 0x80 | need_to_set_addr;
need_to_set_addr = 0;
switch (master_state >> 24) {
case STATE_SET_ADDR:
R16_USBD_DADDR = 0x80 | (master_state & 0x7f);
master_state = 0;
R16_USBD_EPR(0) = (0b01 << 9) | (0b11 << 4); // STALL if another IN
break;
case STATE_GET_DEV_DESC:
uint32_t byte_pos = (master_state >> 8) & 0xff;
uint32_t bytes_left = master_state & 0xff;
if (bytes_left == 0) {
// ready for OUT status ACK, no more IN
master_state = (STATE_CTRL_STATUS_OUT << 24);
R16_USBD_EPR(0) = (0b01 << 9) | (0b10 << 12) | (1 << 8) | (0b11 << 4);
} else {
uint32_t bytes = bytes_left;
if (bytes > 8) bytes = 8;
if (byte_pos + bytes > sizeof(USB_DEV_DESC))
bytes = sizeof(USB_DEV_DESC) - byte_pos;
for (int i = 0; i < bytes; i+=2)
USB_EP0_IN(i) = *((uint16_t*)(&USB_DEV_DESC[byte_pos + i]));
if (bytes < 8) {
USB_DESCS[0].count_tx = bytes;
master_state = (STATE_GET_DEV_DESC << 24);
} else {
USB_DESCS[0].count_tx = 8;
master_state = (STATE_GET_DEV_DESC << 24) | ((byte_pos + 8) << 8) | (bytes_left - 8);
}
R16_USBD_EPR(0) = (0b01 << 9) | (0b01 << 4); // ACK for IN
}
}
}
}