使用 DMA 生成 STM32F3 DAC 信号
STM32F3 DAC signal generation using DMA
我正在编写一个程序，该程序应该在我的 STM32f3Discovery 板上使用 DAC 生成正弦波。我在下面列出的几个文件中都有它。
Utilities.h:
#ifndef UTILITIES_H
#define UTILITIES_H
/** @brief Configure GPIOE, pin 9 (LED) as output PP
*/
void GPIOE_init( void );
/** @brief Configure Timer 2, event frequency - 100Hz
*/
void Timer_init( void );
/** @brief Configure interrupt handler
*/
void NVIC_config( void );
/** @brief Configure and enable DAC channel 1 on pin PA4,
* with TIM2 TRGO as trigger
*/
void DACch1_config( void );
/** @brief Configure DMA to work with DAC
*/
void DMA_config( void );
#endif //UTILITIES_H
Utilities.c:
#include "utilities.h"
#include "stm32f30x.h"
const uint16_t sineWave12bit[32] = {
2048,2447,2831,3185,3495,3750,3939,4056,
4095,4056,3939,3750,3495,3185,2831,2447,
2048,1648,1264,910,600,345,156,39,
0,39,156,345,600,910,1264,1648 };
//This address is taken from reference manual for stm32f30
//See pages 53 and 439
#define DAC_DHR12RD_ADDRESS 0x40007420
void Timer_init( void ){
/* Configuring frequency of timer, thus sinus frequency */
/* Keep in mind, that system clock is set to 80Mhz */
TIM_TimeBaseInitTypeDef timer2;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseStructInit( &timer2 );
timer2.TIM_CounterMode = TIM_CounterMode_Up;
//Setting prescaler so that timer clock will be only 10000Hz
timer2.TIM_Prescaler = 8000 - 1;
//Setting period so Timer will give signal of frequency 100Hz
timer2.TIM_Period = 100 - 1;
TIM_TimeBaseInit( TIM2, &timer2 );
//generate event when counter hits TIM_period value
TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);
/* TIM2 enable counter */
TIM_Cmd(TIM2, ENABLE);
}
void NVIC_config( void ){
NVIC_InitTypeDef nvic;
nvic.NVIC_IRQChannel = TIM2_IRQn;
nvic.NVIC_IRQChannelPreemptionPriority = 0;
nvic.NVIC_IRQChannelSubPriority = 0;
nvic.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init( &nvic );
}
void GPIOE_init( void ){
/* GPIOE initialization */
GPIO_InitTypeDef leds;
RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOE, ENABLE );
leds.GPIO_Pin = GPIO_Pin_9;
leds.GPIO_Mode = GPIO_Mode_OUT;
leds.GPIO_OType = GPIO_OType_PP;
leds.GPIO_Speed = GPIO_Speed_50MHz;
leds.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOE, &leds);
}
void DACch1_config( void ){
/*******THERE IS ONLY ONE DAC ON STM32F30!!!!!!!!!!!!!!!!!!******************/
DAC_InitTypeDef DACch1;
GPIO_InitTypeDef DACch1_out;
/* Enable GPIOA Periph clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/* Configure PA04 as analog */
DACch1_out.GPIO_Pin = GPIO_Pin_4;
DACch1_out.GPIO_Mode = GPIO_Mode_AN;
DACch1_out.GPIO_OType = GPIO_OType_PP;
DACch1_out.GPIO_PuPd = GPIO_PuPd_NOPULL;
DACch1_out.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &DACch1_out);
/* Enable DAC clock */
RCC_APB1PeriphClockCmd( RCC_APB1Periph_DAC, ENABLE );
/* Init the DAC_Init structure */
DAC_StructInit(&DACch1);
/* Configure DAC */
DACch1.DAC_Trigger = DAC_Trigger_T2_TRGO;
DACch1.DAC_WaveGeneration = DAC_WaveGeneration_None;
DACch1.DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bits2_0;
DACch1.DAC_OutputBuffer = DAC_OutputBuffer_Disable;
/* DAC channel 1 configuration*/
DAC_Init( DAC_Channel_1, &DACch1 );
/* Enable DAC channel 1 */
DAC_Cmd( DAC_Channel_1, ENABLE);
}
void DMA_config( void ){
DMA_InitTypeDef mem2DAC;
/* Enable clock for DMA1 */
RCC_AHBPeriphClockCmd( RCC_AHBPeriph_DMA1, ENABLE );
/* Reset DMA1 channel 1 register values to default */
DMA_DeInit(DMA1_Channel1);
//Specify destination address
mem2DAC.DMA_PeripheralBaseAddr = DAC_DHR12RD_ADDRESS;
//Specify source address - LUT for sine
mem2DAC.DMA_MemoryBaseAddr = (uint32_t) &sineWave12bit;
//Set Peripheral as destination
mem2DAC.DMA_DIR = DMA_DIR_PeripheralDST;
mem2DAC.DMA_BufferSize = 32;
mem2DAC.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
mem2DAC.DMA_MemoryInc = DMA_MemoryInc_Enable;
mem2DAC.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
mem2DAC.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
mem2DAC.DMA_Mode = DMA_Mode_Circular;
mem2DAC.DMA_Priority = DMA_Priority_High;
mem2DAC.DMA_M2M = DMA_M2M_Disable;
DMA_Init( DMA1_Channel1, &mem2DAC );
/* Enable DMA1 Channel1 */
DMA_Cmd( DMA1_Channel1, ENABLE );
/* Enable DMA fo DAC channel 1*/
DAC_DMACmd( DAC_Channel_1, ENABLE );
}
main.c:
/**
******************************************************************************
* @file main.c
* @author Ac6
* @version V1.0
* @date 01-December-2013
* @brief Default main function.
******************************************************************************
*/
#include "stm32f30x.h"
#include "utilities.h"
int main(void)
{
DMA_config();
DACch1_config();
Timer_init();
while(1){
}
}
所以理论上它应该在引脚 A.04 上产生正弦波。然而，当我使用示波器查看此引脚上的电压时，它没有显示任何内容（地电位）。
有谁知道哪里出了问题？
我遇到了类似的问题。首先检查您的 MCU 是否有 DAC 模块。可能没有 DAC 外设，在这种情况下不会生成正弦波。您可以在数据 sheet 中检查您的特定微控制器包。
好的，我修好了。如果其他人有兴趣，似乎唯一合适的可以驱动 DAC_1 的 DMA 通道是 DMA2 通道 3。它可以以某种方式重新映射到 DMA1 通道 3，我仍在努力。
编辑：
一切正常。如果对某人有任何帮助，以下是让 DAC 在 STM32f3 上运行的所有必要步骤：
为 timerX 启用时钟（必须查看哪些定时器可用于通过 TRGO 事件触发 DAC）、DMA、DAC 和 GPIOA。如果您想为 DAC 使用非默认 DMA，请为 SYSCFG 启用时钟。
设置所需的 DAC 通道。请注意，在 STM32f3 Discovery 上只有 1 个 DAC 和 2 个通道。 DACch1输出是PA4，DACch2输出是PA5。
将选定的 GPIOA 配置为模拟输入并初始化。
配置 DAC 和初始化。记得为DAC开启DMA。
如果您想更改 DMA 的默认设置以与 DAC 一起使用，请使用 SYSCFG_DMAChannelRemapConfig 命令。
配置 DMA 和初始化。
配置所需的定时器和初始化。记得设置TRGO中断！
下面我包含了使用非默认 DMA 在 DACch1 上生成正弦波的工作代码。
#include "utilities.h"
#include "stm32f30x.h"
const uint16_t sineWave12bit[64] = {
2048,2248,2447,2642,2831,3013,3185,3346,
3495,3630,3750,3853,3939,4007,4056,4085,
4095,4085,4056,4007,3939,3853,3750,3630,
3495,3346,3185,3013,2831,2642,2447,2248,
2048,1847,1648,1453,1264,1082,910,749,
600,465,345,242,156,88,39,10,
0,10,39,88,156,242,345,465,
600,749,910,1082,1264,1453,1648,1847 };
//This address is taken from reference manual for stm32f30
//See pages 53 and 439
#define DAC_DHR12R1_ADDRESS 0x40007408
void Timer_init( void ){
/* Configuring frequency of timer, thus sinus frequency */
/* Keep in mind, that system clock is set to 80Mhz */
TIM_TimeBaseInitTypeDef timer2;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseStructInit( &timer2 );
timer2.TIM_CounterMode = TIM_CounterMode_Up;
//Setting prescaler so that timer clock will be only 10000Hz
timer2.TIM_Prescaler = 8000 - 1;
//Setting period so Timer will give signal of frequency 1000Hz
timer2.TIM_Period = 10 - 1;
TIM_TimeBaseInit( TIM2, &timer2 );
//generate event when counter hits TIM_period value
TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);
/* TIM2 enable counter */
TIM_Cmd(TIM2, ENABLE);
}
void NVIC_config( void ){
NVIC_InitTypeDef nvic;
nvic.NVIC_IRQChannel = TIM2_IRQn;
nvic.NVIC_IRQChannelPreemptionPriority = 0;
nvic.NVIC_IRQChannelSubPriority = 0;
nvic.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init( &nvic );
}
void GPIOE_init( void ){
/* GPIOE initialization */
GPIO_InitTypeDef leds;
RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOE, ENABLE );
leds.GPIO_Pin = GPIO_Pin_9;
leds.GPIO_Mode = GPIO_Mode_OUT;
leds.GPIO_OType = GPIO_OType_PP;
leds.GPIO_Speed = GPIO_Speed_50MHz;
leds.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOE, &leds);
}
void DACch1_config( void ){
/*******THERE IS ONLY ONE DAC ON STM32F30!!!!!!!!!!!!!!!!!!******************/
DAC_InitTypeDef DACch1;
GPIO_InitTypeDef DACch1_out;
/* Enable GPIOA Periph clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/* Configure PA04 as analog */
DACch1_out.GPIO_Pin = GPIO_Pin_4;
DACch1_out.GPIO_Mode = GPIO_Mode_AN;
DACch1_out.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &DACch1_out);
/* Enable DAC clock */
RCC_APB1PeriphClockCmd( RCC_APB1Periph_DAC, ENABLE );
/* Init the DAC_Init structure */
DAC_StructInit(&DACch1);
/* Reset DAC configuration */
DAC_DeInit();
/* Configure DAC */
DACch1.DAC_Trigger = DAC_Trigger_T2_TRGO;
DACch1.DAC_WaveGeneration = DAC_WaveGeneration_None;
DACch1.DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bits2_0;
DACch1.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
/* DAC channel 1 configuration*/
DAC_Init( DAC_Channel_1, &DACch1 );
/* Enable DAC channel 1 */
DAC_Cmd( DAC_Channel_1, ENABLE);
}
void DMA_config( void ){
DMA_InitTypeDef mem2DAC;
/* Enable clock for SYSCFG in order to change DMA for DAC from
* DMA2 channel3 to DMA1 channel 3 (default is DMA2 channel 3) */
RCC_APB2PeriphClockCmd( RCC_APB2Periph_SYSCFG, ENABLE );
/* Use DMA1 channel 3 for DAC1 */
SYSCFG_DMAChannelRemapConfig( SYSCFG_DMARemap_TIM6DAC1, ENABLE );
/* Enable clock for DMA1 */
RCC_AHBPeriphClockCmd( RCC_AHBPeriph_DMA1, ENABLE );
/* Reset DMA1 channel 1 register values to default */
DMA_DeInit( DMA1_Channel3 );
mem2DAC.DMA_PeripheralBaseAddr = DAC_DHR12R1_ADDRESS;
mem2DAC.DMA_MemoryBaseAddr = (uint32_t)&sineWave12bit;
mem2DAC.DMA_DIR = DMA_DIR_PeripheralDST;
mem2DAC.DMA_BufferSize = 64;
mem2DAC.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
mem2DAC.DMA_MemoryInc = DMA_MemoryInc_Enable;
mem2DAC.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
mem2DAC.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
mem2DAC.DMA_Mode = DMA_Mode_Circular;
mem2DAC.DMA_Priority = DMA_Priority_High;
mem2DAC.DMA_M2M = DMA_M2M_Disable;
DMA_Init( DMA1_Channel3, &mem2DAC );
/* Enable DMA1 Channel1 */
DMA_Cmd( DMA1_Channel3, ENABLE );
/* Enable DMA fo DAC channel 1*/
DAC_DMACmd( DAC_Channel_1, ENABLE );
}
我正在编写一个程序，该程序应该在我的 STM32f3Discovery 板上使用 DAC 生成正弦波。我在下面列出的几个文件中都有它。
Utilities.h:
#ifndef UTILITIES_H
#define UTILITIES_H
/** @brief Configure GPIOE, pin 9 (LED) as output PP
*/
void GPIOE_init( void );
/** @brief Configure Timer 2, event frequency - 100Hz
*/
void Timer_init( void );
/** @brief Configure interrupt handler
*/
void NVIC_config( void );
/** @brief Configure and enable DAC channel 1 on pin PA4,
* with TIM2 TRGO as trigger
*/
void DACch1_config( void );
/** @brief Configure DMA to work with DAC
*/
void DMA_config( void );
#endif //UTILITIES_H
Utilities.c:
#include "utilities.h"
#include "stm32f30x.h"
const uint16_t sineWave12bit[32] = {
2048,2447,2831,3185,3495,3750,3939,4056,
4095,4056,3939,3750,3495,3185,2831,2447,
2048,1648,1264,910,600,345,156,39,
0,39,156,345,600,910,1264,1648 };
//This address is taken from reference manual for stm32f30
//See pages 53 and 439
#define DAC_DHR12RD_ADDRESS 0x40007420
void Timer_init( void ){
/* Configuring frequency of timer, thus sinus frequency */
/* Keep in mind, that system clock is set to 80Mhz */
TIM_TimeBaseInitTypeDef timer2;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseStructInit( &timer2 );
timer2.TIM_CounterMode = TIM_CounterMode_Up;
//Setting prescaler so that timer clock will be only 10000Hz
timer2.TIM_Prescaler = 8000 - 1;
//Setting period so Timer will give signal of frequency 100Hz
timer2.TIM_Period = 100 - 1;
TIM_TimeBaseInit( TIM2, &timer2 );
//generate event when counter hits TIM_period value
TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);
/* TIM2 enable counter */
TIM_Cmd(TIM2, ENABLE);
}
void NVIC_config( void ){
NVIC_InitTypeDef nvic;
nvic.NVIC_IRQChannel = TIM2_IRQn;
nvic.NVIC_IRQChannelPreemptionPriority = 0;
nvic.NVIC_IRQChannelSubPriority = 0;
nvic.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init( &nvic );
}
void GPIOE_init( void ){
/* GPIOE initialization */
GPIO_InitTypeDef leds;
RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOE, ENABLE );
leds.GPIO_Pin = GPIO_Pin_9;
leds.GPIO_Mode = GPIO_Mode_OUT;
leds.GPIO_OType = GPIO_OType_PP;
leds.GPIO_Speed = GPIO_Speed_50MHz;
leds.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOE, &leds);
}
void DACch1_config( void ){
/*******THERE IS ONLY ONE DAC ON STM32F30!!!!!!!!!!!!!!!!!!******************/
DAC_InitTypeDef DACch1;
GPIO_InitTypeDef DACch1_out;
/* Enable GPIOA Periph clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/* Configure PA04 as analog */
DACch1_out.GPIO_Pin = GPIO_Pin_4;
DACch1_out.GPIO_Mode = GPIO_Mode_AN;
DACch1_out.GPIO_OType = GPIO_OType_PP;
DACch1_out.GPIO_PuPd = GPIO_PuPd_NOPULL;
DACch1_out.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &DACch1_out);
/* Enable DAC clock */
RCC_APB1PeriphClockCmd( RCC_APB1Periph_DAC, ENABLE );
/* Init the DAC_Init structure */
DAC_StructInit(&DACch1);
/* Configure DAC */
DACch1.DAC_Trigger = DAC_Trigger_T2_TRGO;
DACch1.DAC_WaveGeneration = DAC_WaveGeneration_None;
DACch1.DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bits2_0;
DACch1.DAC_OutputBuffer = DAC_OutputBuffer_Disable;
/* DAC channel 1 configuration*/
DAC_Init( DAC_Channel_1, &DACch1 );
/* Enable DAC channel 1 */
DAC_Cmd( DAC_Channel_1, ENABLE);
}
void DMA_config( void ){
DMA_InitTypeDef mem2DAC;
/* Enable clock for DMA1 */
RCC_AHBPeriphClockCmd( RCC_AHBPeriph_DMA1, ENABLE );
/* Reset DMA1 channel 1 register values to default */
DMA_DeInit(DMA1_Channel1);
//Specify destination address
mem2DAC.DMA_PeripheralBaseAddr = DAC_DHR12RD_ADDRESS;
//Specify source address - LUT for sine
mem2DAC.DMA_MemoryBaseAddr = (uint32_t) &sineWave12bit;
//Set Peripheral as destination
mem2DAC.DMA_DIR = DMA_DIR_PeripheralDST;
mem2DAC.DMA_BufferSize = 32;
mem2DAC.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
mem2DAC.DMA_MemoryInc = DMA_MemoryInc_Enable;
mem2DAC.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
mem2DAC.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
mem2DAC.DMA_Mode = DMA_Mode_Circular;
mem2DAC.DMA_Priority = DMA_Priority_High;
mem2DAC.DMA_M2M = DMA_M2M_Disable;
DMA_Init( DMA1_Channel1, &mem2DAC );
/* Enable DMA1 Channel1 */
DMA_Cmd( DMA1_Channel1, ENABLE );
/* Enable DMA fo DAC channel 1*/
DAC_DMACmd( DAC_Channel_1, ENABLE );
}
main.c:
/**
******************************************************************************
* @file main.c
* @author Ac6
* @version V1.0
* @date 01-December-2013
* @brief Default main function.
******************************************************************************
*/
#include "stm32f30x.h"
#include "utilities.h"
int main(void)
{
DMA_config();
DACch1_config();
Timer_init();
while(1){
}
}
所以理论上它应该在引脚 A.04 上产生正弦波。然而，当我使用示波器查看此引脚上的电压时，它没有显示任何内容（地电位）。
有谁知道哪里出了问题？
我遇到了类似的问题。首先检查您的 MCU 是否有 DAC 模块。可能没有 DAC 外设，在这种情况下不会生成正弦波。您可以在数据 sheet 中检查您的特定微控制器包。
好的，我修好了。如果其他人有兴趣，似乎唯一合适的可以驱动 DAC_1 的 DMA 通道是 DMA2 通道 3。它可以以某种方式重新映射到 DMA1 通道 3，我仍在努力。
编辑：
一切正常。如果对某人有任何帮助，以下是让 DAC 在 STM32f3 上运行的所有必要步骤：
为 timerX 启用时钟（必须查看哪些定时器可用于通过 TRGO 事件触发 DAC）、DMA、DAC 和 GPIOA。如果您想为 DAC 使用非默认 DMA，请为 SYSCFG 启用时钟。
设置所需的 DAC 通道。请注意，在 STM32f3 Discovery 上只有 1 个 DAC 和 2 个通道。 DACch1输出是PA4，DACch2输出是PA5。
将选定的 GPIOA 配置为模拟输入并初始化。
配置 DAC 和初始化。记得为DAC开启DMA。
如果您想更改 DMA 的默认设置以与 DAC 一起使用，请使用 SYSCFG_DMAChannelRemapConfig 命令。
配置 DMA 和初始化。
配置所需的定时器和初始化。记得设置TRGO中断！
下面我包含了使用非默认 DMA 在 DACch1 上生成正弦波的工作代码。
#include "utilities.h"
#include "stm32f30x.h"
const uint16_t sineWave12bit[64] = {
2048,2248,2447,2642,2831,3013,3185,3346,
3495,3630,3750,3853,3939,4007,4056,4085,
4095,4085,4056,4007,3939,3853,3750,3630,
3495,3346,3185,3013,2831,2642,2447,2248,
2048,1847,1648,1453,1264,1082,910,749,
600,465,345,242,156,88,39,10,
0,10,39,88,156,242,345,465,
600,749,910,1082,1264,1453,1648,1847 };
//This address is taken from reference manual for stm32f30
//See pages 53 and 439
#define DAC_DHR12R1_ADDRESS 0x40007408
void Timer_init( void ){
/* Configuring frequency of timer, thus sinus frequency */
/* Keep in mind, that system clock is set to 80Mhz */
TIM_TimeBaseInitTypeDef timer2;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseStructInit( &timer2 );
timer2.TIM_CounterMode = TIM_CounterMode_Up;
//Setting prescaler so that timer clock will be only 10000Hz
timer2.TIM_Prescaler = 8000 - 1;
//Setting period so Timer will give signal of frequency 1000Hz
timer2.TIM_Period = 10 - 1;
TIM_TimeBaseInit( TIM2, &timer2 );
//generate event when counter hits TIM_period value
TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);
/* TIM2 enable counter */
TIM_Cmd(TIM2, ENABLE);
}
void NVIC_config( void ){
NVIC_InitTypeDef nvic;
nvic.NVIC_IRQChannel = TIM2_IRQn;
nvic.NVIC_IRQChannelPreemptionPriority = 0;
nvic.NVIC_IRQChannelSubPriority = 0;
nvic.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init( &nvic );
}
void GPIOE_init( void ){
/* GPIOE initialization */
GPIO_InitTypeDef leds;
RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOE, ENABLE );
leds.GPIO_Pin = GPIO_Pin_9;
leds.GPIO_Mode = GPIO_Mode_OUT;
leds.GPIO_OType = GPIO_OType_PP;
leds.GPIO_Speed = GPIO_Speed_50MHz;
leds.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOE, &leds);
}
void DACch1_config( void ){
/*******THERE IS ONLY ONE DAC ON STM32F30!!!!!!!!!!!!!!!!!!******************/
DAC_InitTypeDef DACch1;
GPIO_InitTypeDef DACch1_out;
/* Enable GPIOA Periph clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/* Configure PA04 as analog */
DACch1_out.GPIO_Pin = GPIO_Pin_4;
DACch1_out.GPIO_Mode = GPIO_Mode_AN;
DACch1_out.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &DACch1_out);
/* Enable DAC clock */
RCC_APB1PeriphClockCmd( RCC_APB1Periph_DAC, ENABLE );
/* Init the DAC_Init structure */
DAC_StructInit(&DACch1);
/* Reset DAC configuration */
DAC_DeInit();
/* Configure DAC */
DACch1.DAC_Trigger = DAC_Trigger_T2_TRGO;
DACch1.DAC_WaveGeneration = DAC_WaveGeneration_None;
DACch1.DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bits2_0;
DACch1.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
/* DAC channel 1 configuration*/
DAC_Init( DAC_Channel_1, &DACch1 );
/* Enable DAC channel 1 */
DAC_Cmd( DAC_Channel_1, ENABLE);
}
void DMA_config( void ){
DMA_InitTypeDef mem2DAC;
/* Enable clock for SYSCFG in order to change DMA for DAC from
* DMA2 channel3 to DMA1 channel 3 (default is DMA2 channel 3) */
RCC_APB2PeriphClockCmd( RCC_APB2Periph_SYSCFG, ENABLE );
/* Use DMA1 channel 3 for DAC1 */
SYSCFG_DMAChannelRemapConfig( SYSCFG_DMARemap_TIM6DAC1, ENABLE );
/* Enable clock for DMA1 */
RCC_AHBPeriphClockCmd( RCC_AHBPeriph_DMA1, ENABLE );
/* Reset DMA1 channel 1 register values to default */
DMA_DeInit( DMA1_Channel3 );
mem2DAC.DMA_PeripheralBaseAddr = DAC_DHR12R1_ADDRESS;
mem2DAC.DMA_MemoryBaseAddr = (uint32_t)&sineWave12bit;
mem2DAC.DMA_DIR = DMA_DIR_PeripheralDST;
mem2DAC.DMA_BufferSize = 64;
mem2DAC.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
mem2DAC.DMA_MemoryInc = DMA_MemoryInc_Enable;
mem2DAC.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
mem2DAC.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
mem2DAC.DMA_Mode = DMA_Mode_Circular;
mem2DAC.DMA_Priority = DMA_Priority_High;
mem2DAC.DMA_M2M = DMA_M2M_Disable;
DMA_Init( DMA1_Channel3, &mem2DAC );
/* Enable DMA1 Channel1 */
DMA_Cmd( DMA1_Channel3, ENABLE );
/* Enable DMA fo DAC channel 1*/
DAC_DMACmd( DAC_Channel_1, ENABLE );
}