mirror of
https://github.com/saymrwulf/pulp-runtime.git
synced 2026-05-18 21:21:23 +00:00
dfd91b93a1
This mod is tailored for Astral and its host, Cheshire, whose basic funcitons are reused. This enables printing from the cluster.
116 lines
2.4 KiB
C
116 lines
2.4 KiB
C
/*
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* Copyright (C) 2019 ETH Zurich, University of Bologna
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "pulp.h"
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#define UART_BAUDRATE 115200
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static void uart_wait_tx_done(int periph)
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{
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while (plp_udma_busy(UDMA_UART_TX_ADDR(periph - ARCHI_UDMA_UART_ID(0))))
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{
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}
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while(plp_uart_tx_busy(periph - ARCHI_UDMA_UART_ID(0)));
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}
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static void uart_wait_rx_done(int periph)
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{
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while (plp_udma_busy(UDMA_UART_RX_ADDR(periph - ARCHI_UDMA_UART_ID(0))))
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{
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}
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}
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static void uart_setup(int channel, int baudrate)
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{
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int div = (pos_freq_domains[PI_FREQ_DOMAIN_PERIPH] + baudrate/2) / baudrate;
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plp_uart_setup(channel - ARCHI_UDMA_UART_ID(0), 0, div-1);
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}
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int uart_open(int uart_id, int baudrate)
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{
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int periph_id = ARCHI_UDMA_UART_ID(uart_id);
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int channel = UDMA_EVENT_ID(periph_id);
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plp_udma_cg_set(plp_udma_cg_get() | (1<<periph_id));
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soc_eu_fcEventMask_setEvent(channel);
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soc_eu_fcEventMask_setEvent(channel+1);
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uart_setup(periph_id, baudrate);
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return 0;
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}
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void uart_close(int uart_id)
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{
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int periph_id = ARCHI_UDMA_UART_ID(uart_id);
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int channel = UDMA_EVENT_ID(periph_id);
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uart_wait_tx_done(periph_id);
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plp_uart_disable(periph_id);
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plp_udma_cg_set(plp_udma_cg_get() & ~(1<<periph_id));
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}
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int uart_write(int uart_id, void *buffer, uint32_t size)
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{
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int periph_id = ARCHI_UDMA_UART_ID(uart_id);
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int channel = UDMA_EVENT_ID(periph_id) + 1;
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unsigned int base = hal_udma_channel_base(channel);
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plp_udma_enqueue(base, (int)buffer, size, UDMA_CHANNEL_CFG_EN | UDMA_CHANNEL_CFG_SIZE_8);
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uart_wait_tx_done(periph_id);
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return 0;
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}
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int uart_read(int uart_id, void *buffer, uint32_t size)
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{
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int periph_id = ARCHI_UDMA_UART_ID(uart_id);
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int channel = UDMA_EVENT_ID(periph_id);
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unsigned int base = hal_udma_channel_base(channel);
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plp_udma_enqueue(base, (int)buffer, size, UDMA_CHANNEL_CFG_EN | UDMA_CHANNEL_CFG_SIZE_8);
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uart_wait_rx_done(periph_id);
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return 0;
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}
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