mirror of https://github.com/efabless/caravel.git
74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
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/*
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* SPDX-FileCopyrightText: 2020 Efabless Corporation
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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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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <defs.h>
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/*
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Testing timer interrupts
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Enable interrupt for timer0 and configure it as countdown 1 shot
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wait for interrupt
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*/
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void main(){
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uint32_t value;
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uint32_t old_value;
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reg_wb_enable =1; // for enable writing to reg_debug_1 and reg_debug_2
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reg_debug_1 = 0x0;
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reg_debug_2 = 0x0;
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/* Configure timer for a single-shot countdown */
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reg_timer0_config = 0; // disable
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reg_timer0_data = 0;
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reg_timer0_data_periodic = 0x300;
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reg_timer0_config = 1; // enable
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// Loop, waiting for the interrupt to change reg_mprj_datah
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// test path if counter value stop updated after reach 0 and also the value is always decrementing
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reg_timer0_update = 1; // update reg_timer0_value with new counter value
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old_value = reg_timer0_value;
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// value us decrementing until it reachs zero
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int rollover = 0;
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int timeout = 400;
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for (int i = 0; i < timeout; i++){
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reg_timer0_update = 1; // update reg_timer0_value with new counter value
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value = reg_timer0_value;
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if (value > old_value){
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rollover++;
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if (rollover==1)
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reg_debug_1 = 0x1B; // timer rollover
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else if (rollover==2)
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reg_debug_1 = 0x2B; //timer rollover second time
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else if (rollover==3){
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reg_debug_1 = 0x3B; //timer rollover second time
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break;
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}
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}
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if (value < old_value){
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reg_debug_1 = 0x4B; // value decreases
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}
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old_value = value;
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}
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if (rollover ==0){
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reg_debug_1 = 0xEE; // counter didn't rollover
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}
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reg_debug_2 = 0xFF; // finish test
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}
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