mbed library sources. Supersedes mbed-src.
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Diff: targets/TARGET_NUVOTON/TARGET_NUC472/dma_api.c
- Revision:
- 153:9398a535854b
- Parent:
- 152:9a67f0b066fc
diff -r 9a67f0b066fc -r 9398a535854b targets/TARGET_NUVOTON/TARGET_NUC472/dma_api.c --- a/targets/TARGET_NUVOTON/TARGET_NUC472/dma_api.c Thu Dec 15 11:48:27 2016 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,178 +0,0 @@ -/* mbed Microcontroller Library - * Copyright (c) 2015-2016 Nuvoton - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#include "dma_api.h" -#include "string.h" -#include "cmsis.h" -#include "mbed_assert.h" -#include "PeripheralNames.h" -#include "nu_modutil.h" -#include "nu_bitutil.h" -#include "dma.h" - -struct nu_dma_chn_s { - void (*handler)(uint32_t, uint32_t); - uint32_t id; - uint32_t event; -}; - -static int dma_inited = 0; -static uint32_t dma_chn_mask = 0; -static struct nu_dma_chn_s dma_chn_arr[PDMA_CH_MAX]; - -static void pdma_vec(void); -static const struct nu_modinit_s dma_modinit = {DMA_0, PDMA_MODULE, 0, 0, PDMA_RST, PDMA_IRQn, (void *) pdma_vec}; - - -void dma_init(void) -{ - if (dma_inited) { - return; - } - - dma_inited = 1; - dma_chn_mask = 0; - memset(dma_chn_arr, 0x00, sizeof (dma_chn_arr)); - - // Reset this module - SYS_ResetModule(dma_modinit.rsetidx); - - // Enable IP clock - CLK_EnableModuleClock(dma_modinit.clkidx); - - PDMA_Open(0); - - NVIC_SetVector(dma_modinit.irq_n, (uint32_t) dma_modinit.var); - NVIC_EnableIRQ(dma_modinit.irq_n); -} - -int dma_channel_allocate(uint32_t capabilities) -{ - if (! dma_inited) { - dma_init(); - } - -#if 1 - int i = nu_cto(dma_chn_mask); - if (i != 32) { - dma_chn_mask |= 1 << i; - memset(dma_chn_arr + i, 0x00, sizeof (struct nu_dma_chn_s)); - return i; - } -#else - int i; - - for (i = 0; i < PDMA_CH_MAX; i ++) { - if ((dma_chn_mask & (1 << i)) == 0) { - // Channel available - dma_chn_mask |= 1 << i; - memset(dma_chn_arr + i, 0x00, sizeof (struct nu_dma_chn_s)); - return i; - } - } -#endif - - // No channel available - return DMA_ERROR_OUT_OF_CHANNELS; -} - -int dma_channel_free(int channelid) -{ - if (channelid != DMA_ERROR_OUT_OF_CHANNELS) { - dma_chn_mask &= ~(1 << channelid); - } - - return 0; -} - -void dma_set_handler(int channelid, uint32_t handler, uint32_t id, uint32_t event) -{ - MBED_ASSERT(dma_chn_mask & (1 << channelid)); - - dma_chn_arr[channelid].handler = (void (*)(uint32_t, uint32_t)) handler; - dma_chn_arr[channelid].id = id; - dma_chn_arr[channelid].event = event; - - // Set interrupt vector if someone has removed it. - NVIC_SetVector(dma_modinit.irq_n, (uint32_t) dma_modinit.var); - NVIC_EnableIRQ(dma_modinit.irq_n); -} - -static void pdma_vec(void) -{ - uint32_t intsts = PDMA_GET_INT_STATUS(); - - // Abort - if (intsts & PDMA_INTSTS_ABTIF_Msk) { - uint32_t abtsts = PDMA_GET_ABORT_STS(); - // Clear all Abort flags - PDMA_CLR_ABORT_FLAG(abtsts); - - while (abtsts) { - int chn_id = nu_ctz(abtsts); - if (dma_chn_mask & (1 << chn_id)) { - struct nu_dma_chn_s *dma_chn = dma_chn_arr + chn_id; - if (dma_chn->handler && (dma_chn->event & DMA_EVENT_ABORT)) { - dma_chn->handler(dma_chn->id, DMA_EVENT_ABORT); - } - } - abtsts &= ~(1 << chn_id); - } - } - - // Transfer done - if (intsts & PDMA_INTSTS_TDIF_Msk) { - uint32_t tdsts = PDMA_GET_TD_STS(); - // Clear all transfer done flags - PDMA_CLR_TD_FLAG(tdsts); - - while (tdsts) { - int chn_id = nu_ctz(tdsts); - if (dma_chn_mask & (1 << chn_id)) { - struct nu_dma_chn_s *dma_chn = dma_chn_arr + chn_id; - if (dma_chn->handler && (dma_chn->event & DMA_EVENT_TRANSFER_DONE)) { - dma_chn->handler(dma_chn->id, DMA_EVENT_TRANSFER_DONE); - } - } - tdsts &= ~(1 << chn_id); - } - } - - // Table empty - if (intsts & PDMA_INTSTS_TEIF_Msk) { - uint32_t scatsts = PDMA_GET_EMPTY_STS(); - // Clear all table empty flags - PDMA_CLR_EMPTY_FLAG(scatsts); - } - - // Timeout - uint32_t reqto = intsts & PDMA_INTSTS_REQTOFX_Msk; - if (reqto) { - // Clear all Timeout flags - PDMA->INTSTS = reqto; - - while (reqto) { - int chn_id = nu_ctz(reqto) >> PDMA_INTSTS_REQTOFX_Pos; - if (dma_chn_mask & (1 << chn_id)) { - struct nu_dma_chn_s *dma_chn = dma_chn_arr + chn_id; - if (dma_chn->handler && (dma_chn->event & DMA_EVENT_TIMEOUT)) { - dma_chn->handler(dma_chn->id, DMA_EVENT_TIMEOUT); - } - } - reqto &= ~(1 << (chn_id + PDMA_INTSTS_REQTOFX_Pos)); - } - } -}