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stm32/usbdev: Simplify HID tx/rx buffer passing.

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This commit is contained in:
Damien George
2017-09-06 23:03:01 +10:00
parent e04b478050
commit b3b922f177
3 changed files with 16 additions and 25 deletions
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15
ports/stm32/usbd_hid_interface.c
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@@ -42,25 +42,24 @@
#include "irq.h"
#include "usb.h"
void usbd_hid_init(usbd_hid_itf_t *hid, USBD_HandleTypeDef *pdev) {
uint8_t *usbd_hid_init(usbd_hid_itf_t *hid, USBD_HandleTypeDef *pdev) {
hid->usb = pdev;
hid->current_read_buffer = 0;
hid->last_read_len = 0;
hid->current_write_buffer = 0;
USBD_HID_SetRxBuffer(pdev, hid->buffer[hid->current_write_buffer]);
// Return the buffer to place the first USB OUT packet
return hid->buffer[hid->current_write_buffer];
}
// Data received over USB OUT endpoint is processed here.
// buf: Buffer of data received
// len: Number of data received (in bytes)
// len: number of bytes received into the buffer we passed to USBD_HID_ReceivePacket
// Returns USBD_OK if all operations are OK else USBD_FAIL
// The buffer we are passed here is just hid->buffer, so we are free to modify it.
int8_t usbd_hid_receive(usbd_hid_itf_t *hid, size_t len, uint8_t *buf) {
int8_t usbd_hid_receive(usbd_hid_itf_t *hid, size_t len) {
hid->current_write_buffer = !hid->current_write_buffer;
hid->last_read_len = len;
// initiate next USB packet transfer, to append to existing data in buffer
USBD_HID_SetRxBuffer(hid->usb, hid->buffer[hid->current_write_buffer]);
USBD_HID_ReceivePacket(hid->usb);
USBD_HID_ReceivePacket(hid->usb, hid->buffer[hid->current_write_buffer]);
// Set NAK to indicate we need to process read buffer
USBD_HID_SetNAK(hid->usb);
return USBD_OK;