ua1zbe
a1206d6fd4
Features: - VFO mode with direct frequency input - POCSAG decoder (512/1200 baud) with BCH(31,21) correction - Full-screen Spectrum analyzer - FM Radio receiver - RSSI signal indicator overlay - Custom boot splash (UA1ZBE / POCSAG pager / build date) Architecture: - app/mode.c — mode dispatcher (VFO/POCSAG/Spectrum/FM) - app/boot_splash.c — 2-second boot splash - app/pocsag/ — POCSAG decoder + BCH correction - app/display_rssi.c — RSSI indicator - main.c — entry point with custom init - syscalls.c — bare-metal _sbrk stub Build: arm-none-eabi-gcc -Os -flto -Wall -Werror -Wextra Size: 57.9KB Flash / 3.6KB RAM Controls: - 0-9: Direct frequency input (VFO) - SK2: POCSAG mode - SK1: Spectrum analyzer - 0: FM Radio - EXIT: Return to VFO - F/*: Toggle 512/1200 baud (in POCSAG)
143 lines
3.7 KiB
C
143 lines
3.7 KiB
C
/**************************************************************************//**
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* @file os_systick.c
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* @brief CMSIS OS Tick SysTick implementation
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* @version V1.0.4
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* @date 20. January 2023
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******************************************************************************/
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/*
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* Copyright (c) 2017-2023 ARM Limited. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* 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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* 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, WITHOUT
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* 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 "os_tick.h"
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//lint -emacro((923,9078),SCB,SysTick) "cast from unsigned long to pointer"
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#include "RTE_Components.h"
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#include CMSIS_device_header
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#ifdef SysTick
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#ifndef SYSTICK_IRQ_PRIORITY
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#define SYSTICK_IRQ_PRIORITY 0xFFU
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#endif
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static uint8_t PendST __attribute__((section(".bss.os")));
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// Setup OS Tick.
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__WEAK int32_t OS_Tick_Setup (uint32_t freq, IRQHandler_t handler) {
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uint32_t load;
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(void)handler;
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if (freq == 0U) {
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//lint -e{904} "Return statement before end of function"
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return (-1);
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}
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load = (SystemCoreClock / freq) - 1U;
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if (load > 0x00FFFFFFU) {
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//lint -e{904} "Return statement before end of function"
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return (-1);
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}
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// Set SysTick Interrupt Priority
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#if ((defined(__ARM_ARCH_8M_MAIN__) && (__ARM_ARCH_8M_MAIN__ != 0)) || \
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(defined(__ARM_ARCH_8_1M_MAIN__) && (__ARM_ARCH_8_1M_MAIN__ != 0)) || \
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(defined(__CORTEX_M) && (__CORTEX_M == 7U)))
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SCB->SHPR[11] = SYSTICK_IRQ_PRIORITY;
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#elif (defined(__ARM_ARCH_8M_BASE__) && (__ARM_ARCH_8M_BASE__ != 0))
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SCB->SHPR[1] |= ((uint32_t)SYSTICK_IRQ_PRIORITY << 24);
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#elif ((defined(__ARM_ARCH_7M__) && (__ARM_ARCH_7M__ != 0)) || \
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(defined(__ARM_ARCH_7EM__) && (__ARM_ARCH_7EM__ != 0)))
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SCB->SHP[11] = SYSTICK_IRQ_PRIORITY;
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#elif (defined(__ARM_ARCH_6M__) && (__ARM_ARCH_6M__ != 0))
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SCB->SHP[1] |= ((uint32_t)SYSTICK_IRQ_PRIORITY << 24);
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#else
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#error "Unknown ARM Core!"
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#endif
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SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk | SysTick_CTRL_TICKINT_Msk;
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SysTick->LOAD = load;
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SysTick->VAL = 0U;
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PendST = 0U;
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return (0);
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}
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/// Enable OS Tick.
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__WEAK void OS_Tick_Enable (void) {
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if (PendST != 0U) {
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PendST = 0U;
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SCB->ICSR = SCB_ICSR_PENDSTSET_Msk;
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}
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SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk;
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}
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/// Disable OS Tick.
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__WEAK void OS_Tick_Disable (void) {
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SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
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if ((SCB->ICSR & SCB_ICSR_PENDSTSET_Msk) != 0U) {
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SCB->ICSR = SCB_ICSR_PENDSTCLR_Msk;
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PendST = 1U;
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}
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}
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// Acknowledge OS Tick IRQ.
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__WEAK void OS_Tick_AcknowledgeIRQ (void) {
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(void)SysTick->CTRL;
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}
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// Get OS Tick IRQ number.
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__WEAK int32_t OS_Tick_GetIRQn (void) {
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return ((int32_t)SysTick_IRQn);
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}
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// Get OS Tick clock.
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__WEAK uint32_t OS_Tick_GetClock (void) {
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return (SystemCoreClock);
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}
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// Get OS Tick interval.
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__WEAK uint32_t OS_Tick_GetInterval (void) {
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return (SysTick->LOAD + 1U);
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}
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// Get OS Tick count value.
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__WEAK uint32_t OS_Tick_GetCount (void) {
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uint32_t val;
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uint32_t count;
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val = SysTick->VAL;
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if (val != 0U) {
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count = (SysTick->LOAD - val) + 1U;
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} else {
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count = 0U;
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}
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return (count);
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}
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// Get OS Tick overflow status.
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__WEAK uint32_t OS_Tick_GetOverflow (void) {
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return ((SCB->ICSR & SCB_ICSR_PENDSTSET_Msk) >> SCB_ICSR_PENDSTSET_Pos);
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}
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#endif // SysTick
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