kopia lustrzana https://github.com/OpenRTX/OpenRTX
Tone generator for CTCSS and user interface 'beep' on MD380
Silvano Seva
rodzic
d261f3e8fe
commit
f7fde110bb
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@ -18,7 +18,8 @@ openrtx_src = ['openrtx/src/main.c',
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openrtx_inc = ['openrtx/include/interfaces',
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'openrtx/include/fonts',
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'platform/drivers/ADC']
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'platform/drivers/ADC',
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'platform/drivers/tones']
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## RTOS
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rtos_src = ['rtos/uC-OS3/Source/__dbg_uCOS-III.c',
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@ -96,7 +97,7 @@ stm32f405_inc = ['platform/mcu/CMSIS/Include',
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'rtos/uC-OS3/Ports/ARM-Cortex-M/ARMv7-M',
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'rtos/uC-CPU/ARM-Cortex-M/ARMv7-M']
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stm32f405_def = {'STM32F40_41xxx': '', 'HSE_VALUE':'8000000'}
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stm32f405_def = {'STM32F40_41xxx': '', 'HSE_VALUE':'8000000'}
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##
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## Platform specializations
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@ -132,6 +133,7 @@ endif
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md380_src = src + stm32f405_src + ['platform/drivers/display/HX83XX_MDxx380.c',
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'platform/drivers/keyboard/keyboard_MDxx380.c',
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'platform/drivers/ADC/ADC1_MDxx380.c',
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'platform/drivers/tones/toneGenerator_MDxx380.c',
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'platform/targets/MD380/platform.c',
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'openrtx/src/graphics/graphics_rgb565.c']
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@ -0,0 +1,179 @@
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/***************************************************************************
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* Copyright (C) 2020 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#include <stdint.h>
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#include <stdbool.h>
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#include <stm32f4xx.h>
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#include <hwconfig.h>
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#include <gpio.h>
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/*
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* Sine table for PWM-based sinewave generation, containing 256 samples over one
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* period of a 64Hz sinewave. This gives a PWM base frequency of 16.384kHz.
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*/
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uint8_t sineTable[] =
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{
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128,131,134,137,140,143,146,149,152,155,158,162,165,167,170,173,176,179,182,
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185,188,190,193,196,198,201,203,206,208,211,213,215,218,220,222,224,226,228,
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230,232,234,235,237,238,240,241,243,244,245,246,248,249,250,250,251,252,253,
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253,254,254,254,255,255,255,255,255,255,255,254,254,254,253,253,252,251,250,
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250,249,248,246,245,244,243,241,240,238,237,235,234,232,230,228,226,224,222,
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220,218,215,213,211,208,206,203,201,198,196,193,190,188,185,182,179,176,173,
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170,167,165,162,158,155,152,149,146,143,140,137,134,131,128,124,121,118,115,
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112,109,106,103,100,97,93,90,88,85,82,79,76,73,70,67,65,62,59,57,54,52,49,47,
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44,42,40,37,35,33,31,29,27,25,23,21,20,18,17,15,14,12,11,10,9,7,6,5,5,4,3,2,
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2,1,1,1,0,0,0,0,0,0,0,1,1,1,2,2,3,4,5,5,6,7,9,10,11,12,14,15,17,18,20,21,23,
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25,27,29,31,33,35,37,40,42,44,47,49,52,54,57,59,62,65,67,70,73,76,79,82,85,88,
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90,93,97,100,103,106,109,112,115,118,121,124
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};
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/*
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* Correction factor to compensate for the (slight) difference between the exact
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* sampling frequency of the sine table and the PWM frequency generated by the
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* timer. This difference causes a frequency error in the resulting output of
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* both CTCSS and "beep" signals.
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* To compensate for this, simply multiply the target frequency by this
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* correction factor.
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*/
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const float freqCorrFactor = 16384.0f/16406.25;
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const uint32_t baseSineFreq = 64;
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uint32_t toneTableIndex = 0; /* Current sine table index for CTCSS generator */
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uint32_t toneTableIncr = 0; /* CTCSS sine table index increment per tick */
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uint32_t beepTableIndex = 0; /* Current sine table index for "beep" generator */
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uint32_t beepTableIncr = 0; /* "beep" sine table index increment per tick */
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uint32_t beepTimerCount = 0; /* Downcounter for timed "beep" */
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void __attribute__((used)) TIM3_IRQHandler()
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{
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toneTableIndex += toneTableIncr;
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beepTableIndex += beepTableIncr;
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TIM3->CCR2 = sineTable[(toneTableIndex >> 16) & 0xFF];
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TIM3->CCR3 = sineTable[(beepTableIndex >> 16) & 0xFF];
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TIM3->SR = 0;
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if(beepTimerCount > 0)
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{
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beepTimerCount--;
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if(beepTimerCount == 0)
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{
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TIM3->CCER &= ~TIM_CCER_CC3E;
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}
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}
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/* Shutdown timer if both compare channels are inactive */
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if((TIM3->CCER & (TIM_CCER_CC2E | TIM_CCER_CC3E)) == 0)
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{
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TIM3->CR1 &= ~TIM_CR1_CEN;
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}
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}
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void toneGen_init()
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{
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/*
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* Configure GPIOs:
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* - CTCSS output is on PC7 (on MD380), that is TIM3-CH2, AF2
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* - "beep" output is on PC8 (on MD380), that is TIM3-CH3, AF2
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*/
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gpio_setMode(CTCSS_OUT, ALTERNATE);
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gpio_setMode(BEEP_OUT, ALTERNATE);
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gpio_setAlternateFunction(CTCSS_OUT, 2);
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gpio_setAlternateFunction(BEEP_OUT, 2);
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/*
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* Timer configuration:
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* - APB1 frequency = 42MHz, with 1:10 prescaler we have Ftick = 4.2MHz
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* - ARR = 255 (8-bit PWM), gives an update rate of 16.406kHz
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* - Nominal update rate is 16.384kHz -> error = +22.25Hz
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*/
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RCC->APB1ENR |= RCC_APB1ENR_TIM3EN;
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TIM3->ARR = 0xFF;
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TIM3->PSC = 9;
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TIM3->CCMR1 = TIM_CCMR1_OC2M_2 /* CH2 in PWM mode 1, preload enabled */
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| TIM_CCMR1_OC2M_1
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| TIM_CCMR1_OC2PE;
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TIM3->CCMR2 = TIM_CCMR2_OC3M_2 /* The same for CH3 */
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| TIM_CCMR2_OC3M_1
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| TIM_CCMR2_OC3PE;
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TIM3->DIER |= TIM_DIER_UIE; /* Interrupt on counter update */
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TIM3->CR1 |= TIM_CR1_ARPE; /* Enable auto preload on reload */
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NVIC_SetPriority(TIM3_IRQn, 10);
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NVIC_EnableIRQ(TIM3_IRQn);
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}
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void toneGen_shutdown()
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{
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RCC->APB1ENR &= ~RCC_APB1ENR_TIM3EN;
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gpio_setMode(CTCSS_OUT, INPUT);
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gpio_setMode(BEEP_OUT, INPUT);
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}
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void toneGen_setToneFreq(float toneFreq)
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{
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/*
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* Convert to 16.16 fixed point number, then divide by the frequency of
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* sinewave stored in the PWM table
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*/
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float dividend = toneFreq * freqCorrFactor * 65536.0f;
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toneTableIncr = ((uint32_t) dividend)/baseSineFreq;
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}
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void toneGen_toneOn()
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{
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TIM3->CCER |= TIM_CCER_CC2E;
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TIM3->CR1 |= TIM_CR1_CEN;
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}
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void toneGen_toneOff()
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{
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TIM3->CCER &= ~TIM_CCER_CC2E;
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}
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void toneGen_setBeepFreq(float beepFreq)
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{
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float dividend = beepFreq * freqCorrFactor * 65536.0f;
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beepTableIncr = ((uint32_t) dividend)/baseSineFreq;
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}
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void toneGen_beepOn()
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{
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TIM3->CCER |= TIM_CCER_CC3E;
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TIM3->CR1 |= TIM_CR1_CEN;
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}
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void toneGen_beepOff()
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{
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TIM3->CCER &= ~TIM_CCER_CC3E;
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}
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void toneGen_timedBeep(uint16_t duration)
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{
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/*
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* Duration is in milliseconds, while counter update rate is 16.406kHz.
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* Thus, the value for downcounter is (duration * 16.406)/1000.
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*/
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beepTimerCount = (duration * 16406)/1000;
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TIM3->CCER |= TIM_CCER_CC3E;
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TIM3->CR1 |= TIM_CR1_CEN;
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}
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@ -0,0 +1,82 @@
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/***************************************************************************
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* Copyright (C) 2020 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#ifndef TONE_GENERATOR_H
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#define TONE_GENERATOR_H
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#include <stdint.h>
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/**
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* Tone generator for MDxx380 family, used for both CTCSS tones and user
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* interface "beeps".
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* This driver uses TIM3 of STM32F405 mcu in PWM mode to generate sinewaves
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* using a precomputed sine table.
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*/
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/**
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* Initialise tone generator.
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*/
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void toneGen_init();
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/**
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* Terminate tone generator.
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*/
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void toneGen_shutdown();
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/**
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* Set frequency for CTCSS tone generation.
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* @param toneFreq: CTCSS tone frequency.
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*/
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void toneGen_setToneFreq(float toneFreq);
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/**
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* Activate generation of CTCSS tone.
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*/
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void toneGen_toneOn();
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/**
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* Terminate generation of CTCSS tone.
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*/
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void toneGen_toneOff();
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/**
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* Set frequency for user interface "beep".
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* @param beepFreq: frequency of "beep" tone.
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*/
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void toneGen_setBeepFreq(float beepFreq);
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/**
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* Activate generation of "beep" tone.
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*/
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void toneGen_beepOn();
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/**
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* Terminate generation of "beep" tone.
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*/
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void toneGen_beepOff();
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/**
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* Activate generation of "beep" tone with automatic termination after a given
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* amount of time.
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* @param duration: duration of "beep" tone, in milliseconds.
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*/
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void toneGen_timedBeep(uint16_t duration);
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#endif /* TONE_GENERATOR_H */
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@ -71,4 +71,8 @@
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#define KB_ROW2 GPIOD,2 /* K2 */
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#define KB_ROW3 GPIOD,3 /* K3 */
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/* Tone generator */
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#define CTCSS_OUT GPIOC,7 /* System "beep" */
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#define BEEP_OUT GPIOC,8 /* CTCSS tone */
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#endif
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