From e54a6f119141dd456bab67b6275ad007c017d02c Mon Sep 17 00:00:00 2001 From: drowe67 Date: Fri, 30 May 2014 06:16:33 +0000 Subject: [PATCH] PWM test program used for HF LO git-svn-id: https://svn.code.sf.net/p/freetel/code@1616 01035d8c-6547-0410-b346-abe4f91aad63 --- codec2-dev/stm32/src/stm32f4_pwm.c | 218 +++++++++++++++++++++++++++++ 1 file changed, 218 insertions(+) create mode 100644 codec2-dev/stm32/src/stm32f4_pwm.c diff --git a/codec2-dev/stm32/src/stm32f4_pwm.c b/codec2-dev/stm32/src/stm32f4_pwm.c new file mode 100644 index 00000000..340d8beb --- /dev/null +++ b/codec2-dev/stm32/src/stm32f4_pwm.c @@ -0,0 +1,218 @@ +/*---------------------------------------------------------------------------*\ + + FILE........: stm32f4_pwm.c + AUTHOR......: David Rowe + DATE CREATED: 26 June 2013 + + PWM driver module for STM32F4. + + TODO: + +\*---------------------------------------------------------------------------*/ + +/* + Copyright (C) 2013 David Rowe + + All rights reserved. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License version 2.1, as + published by the Free Software Foundation. This program is + distributed in the hope that it will be useful, but WITHOUT ANY + WARRANTY; without even the implied warranty of MERCHANTABILITY or + FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public + License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with this program; if not, see . +*/ + + +#include +#include +#include + +#include "stm32f4xx_gpio.h" +#include "stm32f4xx_rcc.h" + +#define TIM1_CCR3_ADDRESS 0x4001003C +//#define TIM1_CCR3_ADDRESS 0x4001223C +#define SINE_SAMPLES 32 + +TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; +TIM_OCInitTypeDef TIM_OCInitStructure; +uint16_t uhTimerPeriod; +uint16_t aSRC_Buffer[SINE_SAMPLES] = {0, 0, 0}; + +/* 32 sample sine wave which at Fs=16kHz will be 500Hz. Not sampels + are 16 bit 2's complement, the DAC driver convertsto 12 bit + unsigned. */ + +short aSine[SINE_SAMPLES] = { + -16, 6384, 12528, 18192, 23200, 27232, 30256, 32128, 32752, 32128, + 30256, 27232, 23152, 18192, 12528, 6384, -16, -6416, -12560, -18224, + -23184, -27264, -30288, -32160, -32768, -32160, -30288, -27264, -23184, -18224, + -12560, -6416 +}; + +void Timer1Config(); + +#define FS 16000 + +int main(void){ + Timer1Config(); + while(1); +} + +/* DR: TIM_Config configures a couple of I/O pins for PWM output from + Timer1 Channel 3. Note I dont think any of this is needed, except + perhaps to check timer frequency. Can be removed down the track. */ + +/** + * @brief Configure the TIM1 Pins. + * @param None + * @retval None + */ +static void TIM_Config(void) +{ + GPIO_InitTypeDef GPIO_InitStructure; + DMA_InitTypeDef DMA_InitStructure; + + /* GPIOA and GPIOB clock enable */ + RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB, ENABLE); + + /* GPIOA Configuration: Channel 3 as alternate function push-pull */ + + GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 ; + GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; + GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; + GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; + GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ; + GPIO_Init(GPIOA, &GPIO_InitStructure); + GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_TIM1); + + /* GPIOB Configuration: Channel 3N as alternate function push-pull */ + + GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15; + GPIO_Init(GPIOB, &GPIO_InitStructure); + GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_TIM1); + + /* DMA clock enable */ + RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 , ENABLE); + + DMA_DeInit(DMA2_Stream6); + DMA_InitStructure.DMA_Channel = DMA_Channel_6; + DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(TIM1_CCR3_ADDRESS) ; + DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)aSRC_Buffer; + DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral; + DMA_InitStructure.DMA_BufferSize = SINE_SAMPLES; + DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; + DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; + DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; + DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_HalfWord; + DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; + DMA_InitStructure.DMA_Priority = DMA_Priority_High; + DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; + DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full; + DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; + DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; + + DMA_Init(DMA2_Stream6, &DMA_InitStructure); +} + +void Timer1Config() { + int i; + + /* TIM Configuration */ + + TIM_Config(); + + /* TIM1 example ------------------------------------------------- + + TIM1 input clock (TIM1CLK) is set to 2 * APB2 clock (PCLK2), since APB2 + prescaler is different from 1. + TIM1CLK = 2 * PCLK2 + PCLK2 = HCLK / 2 + => TIM1CLK = 2 * (HCLK / 2) = HCLK = SystemCoreClock + + TIM1CLK = SystemCoreClock, Prescaler = 0, TIM1 counter clock = SystemCoreClock + SystemCoreClock is set to 168 MHz for STM32F4xx devices. + + The objective is to configure TIM1 channel 3 to generate complementary PWM + signal with a frequency equal to F KHz: + - TIM1_Period = (SystemCoreClock / F) - 1 + + The number of this repetitive requests is defined by the TIM1 Repetion counter, + each 3 Update Requests, the TIM1 Channel 3 Duty Cycle changes to the next new + value defined by the aSRC_Buffer. + + Note: + SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f4xx.c file. + Each time the core clock (HCLK) changes, user had to call SystemCoreClockUpdate() + function to update SystemCoreClock variable value. Otherwise, any configuration + based on this variable will be incorrect. + -----------------------------------------------------------------------------*/ + + /* Compute the value to be set in ARR regiter to generate signal frequency at FS */ + + uhTimerPeriod = (SystemCoreClock / FS ) - 1; + + /* Compute CCR1 values to generate a duty cycle at 50% */ + + for(i=0; i