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Diffstat (limited to 'libmaple/usb/stm32f1/usb.c')
-rw-r--r--libmaple/usb/stm32f1/usb.c196
1 files changed, 101 insertions, 95 deletions
diff --git a/libmaple/usb/stm32f1/usb.c b/libmaple/usb/stm32f1/usb.c
index c20cc71..f694f04 100644
--- a/libmaple/usb/stm32f1/usb.c
+++ b/libmaple/usb/stm32f1/usb.c
@@ -28,7 +28,7 @@
* @file libmaple/usb/stm32f1/usb.c
* @brief USB support.
*
- * This is a mess. What we need almost amounts to a ground-up rewrite.
+ * This is a mess.
*/
#include <libmaple/usb.h>
@@ -69,13 +69,14 @@ typedef enum {
} RESUME_STATE;
struct {
- volatile RESUME_STATE eState;
- volatile uint8 bESOFcnt;
+ volatile RESUME_STATE eState;
+ volatile uint8 bESOFcnt;
} ResumeS;
static usblib_dev usblib = {
.irq_mask = USB_ISR_MSK,
.state = USB_UNCONNECTED,
+ .prevState = USB_UNCONNECTED,
.clk_id = RCC_USB,
};
usblib_dev *USBLIB = &usblib;
@@ -105,147 +106,151 @@ void usb_init_usblib(usblib_dev *dev,
}
static void usb_suspend(void) {
- uint16 cntr;
-
- /* TODO decide if read/modify/write is really what we want
- * (e.g. usb_resume_init() reconfigures CNTR). */
- cntr = USB_BASE->CNTR;
- cntr |= USB_CNTR_FSUSP;
- USB_BASE->CNTR = cntr;
- cntr |= USB_CNTR_LP_MODE;
- USB_BASE->CNTR = cntr;
-
- USBLIB->state = USB_SUSPENDED;
+ uint16 cntr;
+
+ /* TODO decide if read/modify/write is really what we want
+ * (e.g. usb_resume_init() reconfigures CNTR). */
+ cntr = USB_BASE->CNTR;
+ cntr |= USB_CNTR_FSUSP;
+ USB_BASE->CNTR = cntr;
+ cntr |= USB_CNTR_LP_MODE;
+ USB_BASE->CNTR = cntr;
+
+ USBLIB->prevState = USBLIB->state;
+ USBLIB->state = USB_SUSPENDED;
}
static void usb_resume_init(void) {
- uint16 cntr;
+ uint16 cntr;
- cntr = USB_BASE->CNTR;
- cntr &= ~USB_CNTR_LP_MODE;
- USB_BASE->CNTR = cntr;
+ cntr = USB_BASE->CNTR;
+ cntr &= ~USB_CNTR_LP_MODE;
+ USB_BASE->CNTR = cntr;
- /* Enable interrupt lines */
- USB_BASE->CNTR = USB_ISR_MSK;
+ /* Enable interrupt lines */
+ USB_BASE->CNTR = USB_ISR_MSK;
}
static void usb_resume(RESUME_STATE eResumeSetVal) {
- uint16 cntr;
+ uint16 cntr;
- if (eResumeSetVal != RESUME_ESOF)
- ResumeS.eState = eResumeSetVal;
+ if (eResumeSetVal != RESUME_ESOF) {
+ ResumeS.eState = eResumeSetVal;
+ }
- switch (ResumeS.eState)
- {
+ switch (ResumeS.eState) {
case RESUME_EXTERNAL:
- usb_resume_init();
- ResumeS.eState = RESUME_OFF;
- break;
+ usb_resume_init();
+ ResumeS.eState = RESUME_OFF;
+ USBLIB->state = USBLIB->prevState;
+ break;
case RESUME_INTERNAL:
- usb_resume_init();
- ResumeS.eState = RESUME_START;
- break;
+ usb_resume_init();
+ ResumeS.eState = RESUME_START;
+ break;
case RESUME_LATER:
- ResumeS.bESOFcnt = 2;
- ResumeS.eState = RESUME_WAIT;
- break;
+ ResumeS.bESOFcnt = 2;
+ ResumeS.eState = RESUME_WAIT;
+ break;
case RESUME_WAIT:
- ResumeS.bESOFcnt--;
- if (ResumeS.bESOFcnt == 0)
- ResumeS.eState = RESUME_START;
- break;
+ ResumeS.bESOFcnt--;
+ if (ResumeS.bESOFcnt == 0) {
+ ResumeS.eState = RESUME_START;
+ }
+ break;
case RESUME_START:
- cntr = USB_BASE->CNTR;
- cntr |= USB_CNTR_RESUME;
- USB_BASE->CNTR = cntr;
- ResumeS.eState = RESUME_ON;
- ResumeS.bESOFcnt = 10;
- break;
+ cntr = USB_BASE->CNTR;
+ cntr |= USB_CNTR_RESUME;
+ USB_BASE->CNTR = cntr;
+ ResumeS.eState = RESUME_ON;
+ ResumeS.bESOFcnt = 10;
+ break;
case RESUME_ON:
- ResumeS.bESOFcnt--;
- if (ResumeS.bESOFcnt == 0) {
- cntr = USB_BASE->CNTR;
- cntr &= ~USB_CNTR_RESUME;
- USB_BASE->CNTR = cntr;
- ResumeS.eState = RESUME_OFF;
- }
- break;
+ ResumeS.bESOFcnt--;
+ if (ResumeS.bESOFcnt == 0) {
+ cntr = USB_BASE->CNTR;
+ cntr &= ~USB_CNTR_RESUME;
+ USB_BASE->CNTR = cntr;
+ USBLIB->state = USBLIB->prevState;
+ ResumeS.eState = RESUME_OFF;
+ }
+ break;
case RESUME_OFF:
case RESUME_ESOF:
default:
- ResumeS.eState = RESUME_OFF;
- break;
+ ResumeS.eState = RESUME_OFF;
+ break;
}
}
#define SUSPEND_ENABLED 1
void __irq_usb_lp_can_rx0(void) {
- uint16 istr = USB_BASE->ISTR;
+ uint16 istr = USB_BASE->ISTR;
- /* Use USB_ISR_MSK to only include code for bits we care about. */
+ /* Use USB_ISR_MSK to only include code for bits we care about. */
#if (USB_ISR_MSK & USB_ISTR_RESET)
- if (istr & USB_ISTR_RESET & USBLIB->irq_mask) {
- USB_BASE->ISTR = ~USB_ISTR_RESET;
- pProperty->Reset();
- }
+ if (istr & USB_ISTR_RESET & USBLIB->irq_mask) {
+ USB_BASE->ISTR = ~USB_ISTR_RESET;
+ pProperty->Reset();
+ }
#endif
#if (USB_ISR_MSK & USB_ISTR_PMAOVR)
- if (istr & ISTR_PMAOVR & USBLIB->irq_mask) {
- USB_BASE->ISTR = ~USB_ISTR_PMAOVR;
- }
+ if (istr & ISTR_PMAOVR & USBLIB->irq_mask) {
+ USB_BASE->ISTR = ~USB_ISTR_PMAOVR;
+ }
#endif
#if (USB_ISR_MSK & USB_ISTR_ERR)
- if (istr & USB_ISTR_ERR & USBLIB->irq_mask) {
- USB_BASE->ISTR = ~USB_ISTR_ERR;
- }
+ if (istr & USB_ISTR_ERR & USBLIB->irq_mask) {
+ USB_BASE->ISTR = ~USB_ISTR_ERR;
+ }
#endif
#if (USB_ISR_MSK & USB_ISTR_WKUP)
- if (istr & USB_ISTR_WKUP & USBLIB->irq_mask) {
- USB_BASE->ISTR = ~USB_ISTR_WKUP;
- usb_resume(RESUME_EXTERNAL);
- }
+ if (istr & USB_ISTR_WKUP & USBLIB->irq_mask) {
+ USB_BASE->ISTR = ~USB_ISTR_WKUP;
+ usb_resume(RESUME_EXTERNAL);
+ }
#endif
#if (USB_ISR_MSK & USB_ISTR_SUSP)
- if (istr & USB_ISTR_SUSP & USBLIB->irq_mask) {
- /* check if SUSPEND is possible */
- if (SUSPEND_ENABLED) {
- usb_suspend();
- } else {
- /* if not possible then resume after xx ms */
- usb_resume(RESUME_LATER);
+ if (istr & USB_ISTR_SUSP & USBLIB->irq_mask) {
+ /* check if SUSPEND is possible */
+ if (SUSPEND_ENABLED) {
+ usb_suspend();
+ } else {
+ /* if not possible then resume after xx ms */
+ usb_resume(RESUME_LATER);
+ }
+ /* clear of the ISTR bit must be done after setting of CNTR_FSUSP */
+ USB_BASE->ISTR = ~USB_ISTR_SUSP;
}
- /* clear of the ISTR bit must be done after setting of CNTR_FSUSP */
- USB_BASE->ISTR = ~USB_ISTR_SUSP;
-}
#endif
#if (USB_ISR_MSK & USB_ISTR_SOF)
- if (istr & USB_ISTR_SOF & USBLIB->irq_mask) {
- USB_BASE->ISTR = ~USB_ISTR_SOF;
- }
+ if (istr & USB_ISTR_SOF & USBLIB->irq_mask) {
+ USB_BASE->ISTR = ~USB_ISTR_SOF;
+ }
#endif
#if (USB_ISR_MSK & USB_ISTR_ESOF)
- if (istr & USB_ISTR_ESOF & USBLIB->irq_mask) {
- USB_BASE->ISTR = ~USB_ISTR_ESOF;
- /* resume handling timing is made with ESOFs */
- usb_resume(RESUME_ESOF); /* request without change of the machine state */
- }
+ if (istr & USB_ISTR_ESOF & USBLIB->irq_mask) {
+ USB_BASE->ISTR = ~USB_ISTR_ESOF;
+ /* resume handling timing is made with ESOFs */
+ usb_resume(RESUME_ESOF); /* request without change of the machine state */
+ }
#endif
- /*
- * Service the correct transfer interrupt.
- */
+ /*
+ * Service the correct transfer interrupt.
+ */
#if (USB_ISR_MSK & USB_ISTR_CTR)
- if (istr & USB_ISTR_CTR & USBLIB->irq_mask) {
- dispatch_ctr_lp();
- }
+ if (istr & USB_ISTR_CTR & USBLIB->irq_mask) {
+ dispatch_ctr_lp();
+ }
#endif
}
@@ -274,8 +279,9 @@ static void dispatch_ctr_lp() {
* once we're done serving endpoint zero, but not okay if
* there are multiple nonzero endpoint transfers to
* handle. */
- if (dispatch_endpt_zero(istr & USB_ISTR_DIR))
+ if (dispatch_endpt_zero(istr & USB_ISTR_DIR)) {
return;
+ }
} else {
dispatch_endpt(ep_id);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 23:53:21 +0000