STM32F1 ADC_DMA and USART_DMA_TX - stm32

Question

I try to finish the code about: ADC using DMA and then the data transfer through PC by using USART. I want to use USART_DMA to avoid occupying CPU. I use sample frequency rate 1000Hz by using array ADC[] and delay 1ms (delay here mean I use systemtick, you haven't check this point I am sure it work well).
In this code below, have I missed something?
So here my code:
USART_DMA code:
/* USARTx configured as follow:
- BaudRate = 115200 baud
- Word Length = 8 Bits
- One Stop Bit
- No parity
- Hardware flow control disabled (RTS and CTS signals)
- Receive and transmit enabled
*/
#include "USART.h"
char TxBuffer[16];
USART_InitTypeDef USART_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
void USART_Configuration(unsigned int BaudRate)
{
/* Characteristic of USART*/
USART_InitStructure.USART_BaudRate = BaudRate;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);
/* Enable USART*/
USART_Cmd(USART1, ENABLE);
}
void DMA_Configuration(void)
{
DMA_DeInit(DMA1_Channel2);
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)TxBuffer; // send buffer
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART1->DR;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; // Transmit
DMA_InitStructure.DMA_BufferSize = 1;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel2, &DMA_InitStructure);
DMA_Cmd(DMA1_Channel2, ENABLE);
USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE);
while (DMA_GetFlagStatus(DMA1_FLAG_TC2) == RESET)
{}
}
ADC_DMA code:
#include "ADC_DMA.h"
uint32_t ADCValue[2] = {0};
void ADC_DMA(void){
ADC_InitTypeDef ADC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
/* DMA Configure */
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADCValue; // address of array data
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&(ADC1->DR));
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = 2; // kich thuoc mang du lieu tuong ung so phan tu cua ADCValue
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_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
/* DMA1_Stream0 enable */
DMA_Cmd(DMA1_Channel1, ENABLE);
/* ADC Common Init */
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 2; //so kenh ADC chuyen doi
ADC_Init(ADC1, &ADC_InitStructure);
/* ADC1 regular channels configuration */
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_7Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_7Cycles5);
/* Enable ADC DMA */
ADC_DMACmd(ADC1, ENABLE);
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);
/* Enable ADC1 reset calibration register */
ADC_ResetCalibration(ADC1);
/* Check the end of ADC1 reset calibration register */
while(ADC_GetResetCalibrationStatus(ADC1));
/* Start ADC1 calibration */
ADC_StartCalibration(ADC1);
/* Check the end of ADC1 calibration */
while(ADC_GetCalibrationStatus(ADC1));
/* Start ADC1 Software Conversion */
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
}
Main function:
#include "stm32f10x.h"
#include "stdio.h"
#include "ADC_DMA.h"
#include "USART.h"
/* Declare variable*/
__IO uint16_t x,y;
extern uint32_t time=0;
extern uint32_t ADCValue[];
extern char TxBuffer[16];
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
void GPIO_Configuration(void);
void Delay(__IO uint32_t nCount);
int main()
{
GPIO_Configuration();
ADC_DMA();
RCC_DeInit();
USART_Configuration(115200);
SysTick_Config(SystemCoreClock / 1000);
/****************************************
*SystemFrequency/1000 1ms *
*SystemFrequency/100000 10us *
*SystemFrequency/1000000 1us *
*****************************************/
while(1)
{
Delay(1000); // 100000 = 100ms
x = ADCValue[0];
y = ADCValue[1];
}
sprintf(TxBuffer,"%d#\n%d$\n", x,y);
}
}
void GPIO_Configuration(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOB, ENABLE);
/* Configure PB0 PB1 in output pushpull mode */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* Configure PA0 in input mode */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Enable clock DMA1 */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
/* Enable clock ADC1 */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_GPIOA, ENABLE);
/* Configure ADC Pin PA0 & PA1 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Enable clock for USART1*/
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
/* Enable clock DMA1 */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
/* Configure USART Tx as alternate function */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure USART Rx as alternate function */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void Delay(__IO uint32_t nCount)
{
time = nCount;
while(nCount--);
}
#ifdef USE_FULL_ASSERT
void assert_failed(uint8_t* file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif