bstanwell/wch-uf2-example
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still doesn't work most of the time but occasionally can get descriptor

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R
2024-04-13 02:01:50 +01:00
parent ede5875016
commit 8f986b45f1
1 changed files with 73 additions and 22 deletions
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bootloader.c
+54 -3
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@@ -41,6 +41,17 @@ const uint8_t USB_DEV_DESC[18] __attribute__((aligned(16))) = {
1, // bNumConfigurations
};
const uint8_t USB_CONF_DESC[9] __attribute__((aligned(16))) = {
9, // bLength
2, // bDescriptorType
0x09, 0x00, // wTotalLength
0, // bNumInterfaces
1, // bConfigurationValue
0, // iConfiguration
0x80, // bmAttributes
250, // bMaxPower
};
#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)))
@@ -67,7 +78,8 @@ const uint8_t USB_DEV_DESC[18] __attribute__((aligned(16))) = {
// state[15:8] = byte pos
// state[7:0] = bytes left
#define STATE_GET_DEV_DESC 0x01
#define STATE_CTRL_STATUS_OUT 0x02
#define STATE_GET_CONF_DESC 0x02
#define STATE_CTRL_STATUS_OUT 0x03
int main(void) {
// PLL setup: system clock 96 MHz
@@ -134,9 +146,21 @@ int main(void) {
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 if (wValue == 0x0200) {
for (int i = 0; i < 8; i+=2)
USB_EP0_IN(i) = *((uint16_t*)(&USB_CONF_DESC[i]));
uint32_t bytes = USB_EP0_OUT(6);
if (bytes < 8) {
USB_DESCS[0].count_tx = bytes;
master_state = (STATE_GET_CONF_DESC << 24);
} else {
USB_DESCS[0].count_tx = 8;
master_state = (STATE_GET_CONF_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) {}
R16_USBD_EPR(0) = (0b01 << 9) | (0b11 << 12) | (0b11 << 4); // STALL for both
}
} else {
// unknown
@@ -159,7 +183,7 @@ int main(void) {
master_state = 0;
R16_USBD_EPR(0) = (0b01 << 9) | (0b11 << 4); // STALL if another IN
break;
case STATE_GET_DEV_DESC:
case STATE_GET_DEV_DESC: {
uint32_t byte_pos = (master_state >> 8) & 0xff;
uint32_t bytes_left = master_state & 0xff;
if (bytes_left == 0) {
@@ -183,6 +207,33 @@ int main(void) {
R16_USBD_EPR(0) = (0b01 << 9) | (0b01 << 4); // ACK for IN
}
}
break;
case STATE_GET_CONF_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_CONF_DESC))
bytes = sizeof(USB_CONF_DESC) - byte_pos;
for (int i = 0; i < bytes; i+=2)
USB_EP0_IN(i) = *((uint16_t*)(&USB_CONF_DESC[byte_pos + i]));
if (bytes < 8) {
USB_DESCS[0].count_tx = bytes;
master_state = (STATE_GET_CONF_DESC << 24);
} else {
USB_DESCS[0].count_tx = 8;
master_state = (STATE_GET_CONF_DESC << 24) | ((byte_pos + 8) << 8) | (bytes_left - 8);
}
R16_USBD_EPR(0) = (0b01 << 9) | (0b01 << 4); // ACK for IN
}
}
break;
}
}
}
R16_USBD_ISTR = 0;