119 lines
4.3 KiB
C
119 lines
4.3 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2017-2018 Scott Shawcroft for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "peripherals/dma.h"
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#include <string.h>
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#include "py/gc.h"
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#include "py/mpstate.h"
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#include "hal/utils/include/utils.h"
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#include "shared-bindings/microcontroller/__init__.h"
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uint8_t sercom_index(Sercom* sercom) {
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return ((uint32_t) sercom - (uint32_t) SERCOM0) / 0x400;
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}
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void dma_configure(uint8_t channel_number, uint8_t trigsrc, bool output_event) {
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common_hal_mcu_disable_interrupts();
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/** Select the DMA channel and clear software trigger */
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DMAC->CHID.reg = DMAC_CHID_ID(channel_number);
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DMAC->CHCTRLA.reg &= ~DMAC_CHCTRLA_ENABLE;
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DMAC->CHCTRLA.reg = DMAC_CHCTRLA_SWRST;
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DMAC->SWTRIGCTRL.reg &= (uint32_t)(~(1 << channel_number));
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uint32_t event_output_enable = 0;
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if (output_event) {
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event_output_enable = DMAC_CHCTRLB_EVOE;
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}
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DMAC->CHCTRLB.reg = DMAC_CHCTRLB_LVL_LVL0 |
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DMAC_CHCTRLB_TRIGSRC(trigsrc) |
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DMAC_CHCTRLB_TRIGACT_BEAT |
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event_output_enable;
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common_hal_mcu_enable_interrupts();
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}
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void dma_enable_channel(uint8_t channel_number) {
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common_hal_mcu_disable_interrupts();
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/** Select the DMA channel and clear software trigger */
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DMAC->CHID.reg = DMAC_CHID_ID(channel_number);
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// Clear any previous interrupts.
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DMAC->CHINTFLAG.reg = DMAC_CHINTFLAG_MASK;
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DMAC->CHCTRLA.bit.ENABLE = true;
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common_hal_mcu_enable_interrupts();
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}
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void dma_disable_channel(uint8_t channel_number) {
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common_hal_mcu_disable_interrupts();
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/** Select the DMA channel and clear software trigger */
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DMAC->CHID.reg = DMAC_CHID_ID(channel_number);
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DMAC->CHCTRLA.bit.ENABLE = false;
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common_hal_mcu_enable_interrupts();
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}
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void dma_suspend_channel(uint8_t channel_number) {
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common_hal_mcu_disable_interrupts();
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/** Select the DMA channel and clear software trigger */
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DMAC->CHID.reg = DMAC_CHID_ID(channel_number);
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DMAC->CHCTRLB.bit.CMD = DMAC_CHCTRLB_CMD_SUSPEND_Val;
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common_hal_mcu_enable_interrupts();
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}
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void dma_resume_channel(uint8_t channel_number) {
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common_hal_mcu_disable_interrupts();
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/** Select the DMA channel and clear software trigger */
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DMAC->CHID.reg = DMAC_CHID_ID(channel_number);
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DMAC->CHCTRLB.bit.CMD = DMAC_CHCTRLB_CMD_RESUME_Val;
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DMAC->CHINTFLAG.reg = DMAC_CHINTFLAG_SUSP;
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common_hal_mcu_enable_interrupts();
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}
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bool dma_channel_enabled(uint8_t channel_number) {
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common_hal_mcu_disable_interrupts();
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/** Select the DMA channel and clear software trigger */
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DMAC->CHID.reg = DMAC_CHID_ID(channel_number);
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bool enabled = DMAC->CHCTRLA.bit.ENABLE;
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common_hal_mcu_enable_interrupts();
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return enabled;
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}
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uint8_t dma_transfer_status(uint8_t channel_number) {
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common_hal_mcu_disable_interrupts();
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/** Select the DMA channel and clear software trigger */
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DMAC->CHID.reg = DMAC_CHID_ID(channel_number);
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uint8_t status = DMAC->CHINTFLAG.reg;
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common_hal_mcu_enable_interrupts();
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return status;
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}
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bool dma_channel_free(uint8_t channel_number) {
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common_hal_mcu_disable_interrupts();
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DMAC->CHID.reg = DMAC_CHID_ID(channel_number);
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bool channel_free = DMAC->CHSTATUS.reg == 0;
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common_hal_mcu_enable_interrupts();
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return channel_free;
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}
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