bstanwell/wch-uf2-example
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2024-04-13 03:31:41 +01:00
parent 70b7c505a0
commit 1b280cc72a
1 changed files with 2 additions and 2 deletions
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bootloader.c
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@@ -92,14 +92,14 @@ const uint8_t USB_CONF_DESC[0x12] __attribute__((aligned(16))) = {
#define STATE_CTRL_STATUS_OUT 0x03
#define STATE_CTRL_SIMPLE_IN 0x04
static inline void set_ep_mode(uint8_t ep, uint8_t stat_rx, uint8_t stat_tx, uint16_t xtra) {
__attribute__((always_inline)) static inline void set_ep_mode(uint8_t ep, uint8_t stat_rx, uint8_t stat_tx, uint16_t xtra) {
uint16_t val = R16_USBD_EPR(0);
uint8_t cur_stat_rx = (val >> 12) & 0b11;
uint8_t cur_stat_tx = (val >> 4) & 0b11;
R16_USBD_EPR(0) = (val & 0b0000011000001111) | xtra | ((stat_rx ^ cur_stat_rx) << 12) | ((stat_tx ^ cur_stat_tx) << 4);
}
int main(void) {
__attribute__((naked)) int main(void) {
// PLL setup: system clock 96 MHz
R32_EXTEN_CTR |= (1 << 4); // sneaky div2
R32_RCC_CFGR0 = (R32_RCC_CFGR0 & ~0xff0000) | (0b01101000 << 16);