kopia lustrzana https://github.com/micropython/micropython
73 wiersze
2.4 KiB
C
73 wiersze
2.4 KiB
C
/*
|
|
* This file is part of the MicroPython project, http://micropython.org/
|
|
*
|
|
* The MIT License (MIT)
|
|
*
|
|
* Copyright (c) 2021 Robert Hammelrath
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#include <stdbool.h>
|
|
#include "py/mpconfig.h"
|
|
#include "fsl_edma.h"
|
|
#include "dma_manager.h"
|
|
|
|
// List of channel flags: true: channel used, false: channel available
|
|
static bool channel_list[FSL_FEATURE_DMAMUX_MODULE_CHANNEL] = {
|
|
true, true, true, true, false, false, false, false,
|
|
false, false, false, false, false, false, false, false,
|
|
|
|
#if FSL_FEATURE_DMAMUX_MODULE_CHANNEL > 16
|
|
|
|
false, false, false, false, false, false, false, false,
|
|
false, false, false, false, false, false, false, false
|
|
|
|
#endif
|
|
};
|
|
|
|
static bool dma_initialized = false;
|
|
|
|
// allocate_channel(): retrieve an available channel. Return the number or -1
|
|
int allocate_dma_channel(void) {
|
|
for (int i = 0; i < ARRAY_SIZE(channel_list); i++) {
|
|
if (channel_list[i] == false) { // Channel available
|
|
channel_list[i] = true;
|
|
return i;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
// free_channel(n): Declare channel as free
|
|
void free_dma_channel(int n) {
|
|
if (n >= 0 && n <= ARRAY_SIZE(channel_list)) {
|
|
channel_list[n] = false;
|
|
}
|
|
}
|
|
|
|
void dma_init(void) {
|
|
if (!dma_initialized) {
|
|
edma_config_t dmaConfig;
|
|
EDMA_GetDefaultConfig(&dmaConfig);
|
|
EDMA_Init(DMA0, &dmaConfig);
|
|
dma_initialized = true;
|
|
}
|
|
}
|