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90 lines
2.0 KiB
C
90 lines
2.0 KiB
C
/*
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* Copyright (C) 2018 Koen Zandberg
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup sys
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* @{
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*
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* @file
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* @brief CDC ACM stdio implementation for USBUS CDC ACM
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*
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* This file implements a USB CDC ACM callback and read/write functions.
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*
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*
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* @}
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*/
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#define USB_H_USER_IS_RIOT_INTERNAL
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#include <stdio.h>
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#include "log.h"
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#include "isrpipe.h"
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#include "usb/usbus.h"
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#include "usb/usbus/cdc/acm.h"
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#if MODULE_VFS
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#include "vfs.h"
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#endif
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#ifdef MODULE_USB_BOARD_RESET
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#include "usb_board_reset.h"
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#endif
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static usbus_cdcacm_device_t cdcacm;
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static uint8_t _cdc_tx_buf_mem[CONFIG_USBUS_CDC_ACM_STDIO_BUF_SIZE];
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static uint8_t _cdc_rx_buf_mem[CONFIG_USBUS_CDC_ACM_STDIO_BUF_SIZE];
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static isrpipe_t _cdc_stdio_isrpipe = ISRPIPE_INIT(_cdc_rx_buf_mem);
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void stdio_init(void)
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{
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/* Initialize this side of the CDC ACM pipe */
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#if MODULE_VFS
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vfs_bind_stdio();
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#endif
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}
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ssize_t stdio_read(void* buffer, size_t len)
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{
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(void)buffer;
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(void)len;
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return isrpipe_read(&_cdc_stdio_isrpipe, buffer, len);
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}
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ssize_t stdio_write(const void* buffer, size_t len)
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{
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const char *start = buffer;
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do {
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size_t n = usbus_cdc_acm_submit(&cdcacm, buffer, len);
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usbus_cdc_acm_flush(&cdcacm);
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/* Use tsrb and flush */
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buffer = (char *)buffer + n;
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len -= n;
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} while (len);
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return start - (char *)buffer;
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}
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static void _cdc_acm_rx_pipe(usbus_cdcacm_device_t *cdcacm,
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uint8_t *data, size_t len)
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{
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(void)cdcacm;
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for (size_t i = 0; i < len; i++) {
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isrpipe_write_one(&_cdc_stdio_isrpipe, data[i]);
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}
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}
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void usb_cdc_acm_stdio_init(usbus_t *usbus)
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{
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usbus_cdc_acm_init(usbus, &cdcacm, _cdc_acm_rx_pipe, NULL,
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_cdc_tx_buf_mem, sizeof(_cdc_tx_buf_mem));
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#ifdef MODULE_USB_BOARD_RESET
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usbus_cdc_acm_set_coding_cb(&cdcacm, usb_board_reset_coding_cb);
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#endif
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}
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