Цитата(MALLOY2 @ Sep 20 2007, 12:46)
Вобщем выложи полностью код инициализации SPI, DMA, а также обслуживающие функции запуска остановки и т.д.
Код
/* Includes ------------------------------------------------------------------*/
//#include "includes.h"
#include "91x_conf.h"
#include "91x_lib.h"
#include "cmath"
#define DMA_Tx DMA_Channel1
#define DMA_Tx_No 1
#define DMA_Tx_ENABLE DMA_Tx->CCNF |= 0x00000001
#define DMA_Tx_DISABLE DMA_Tx->CCNF &= ~0x00000001
#define DMA_Tx_ACTIVE (DMA_Tx->CCNF & 0x00020000)
#define DMA_Tx_End (DMA->TCRISR & (1<#define DMA_Tx_WaitEnd while (! DMA_Tx_End)
#define DMA_Tx_ClrEnd (DMA->TCICR = (1<#define DMA_Tx_ClrErr (DMA->EICR = (1<
volatile u32 DlyCount;
signed short SSP0_Buffer_Tx[32] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12,
0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B,
0x1C, 0x1D, 0x1E, 0x1F, 0x20};
signed short SSP1_Buffer_Tx[16] = {0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F, 0x60};
signed short SSP0_Buffer_Rx[32], SSP1_Buffer_Rx[32];
u8 Tx_Idx=0, Rx_Idx=0, k=0;
DMA_InitTypeDef DMA_InitStruct;
/*******************************************************************************
* Function Name : main
* Description : Main program
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void InitClock (void)
{
// Clock
SCU_MCLKSourceConfig(SCU_MCLK_OSC); // master clk - OSC clk
// Flash controller init
SCU_FMICLKDivisorConfig(SCU_FMICLK_Div1);
FMI_Config(FMI_READ_WAIT_STATE_2,FMI_WRITE_WAIT_STATE_0, FMI_PWD_ENABLE,\
FMI_LVD_ENABLE,FMI_FREQ_HIGH);
// Set clks dividers
SCU_RCLKDivisorConfig(SCU_RCLK_Div1);
SCU_HCLKDivisorConfig(SCU_HCLK_Div1);
SCU_PCLKDivisorConfig(SCU_PCLK_Div2);
// Init PLL = 96 MHz
SCU_PLLFactorsConfig(192,25,2);
// PLL Enabled
SCU_PLLCmd(ENABLE);
// Switch clk MCLK = PLL
SCU_MCLKSourceConfig(SCU_MCLK_PLL);
}
void SCU_Configuration(void)
{
/* Enable the __SSP1 Clock */
SCU_APBPeriphClockConfig(__SSP1 ,ENABLE);
/* Enable the __GPIO5 for SSP0 Clock */
//SCU_APBPeriphClockConfig(__GPIO5 ,ENABLE);
/* Enable the __GPIO3 for SSP1 Clock */
SCU_APBPeriphClockConfig(__GPIO3 ,ENABLE);
SCU_APBPeriphClockConfig(__TIM01 ,ENABLE);
SCU_AHBPeriphClockConfig(__VIC, ENABLE);
SCU_AHBPeriphClockConfig(__DMA, ENABLE);
}
void Start_SSP1_TX_DMA(signed short *Bu, u16 Count)
{
DMA_Tx_DISABLE;
DMA_Tx->SRC=(u32)Bu;
DMA_InitStruct.DMA_Channel_SrcWidth= DMA_SrcWidth_HalfWord;
DMA_InitStruct.DMA_Channel_DesWidth= DMA_DesWidth_HalfWord;
DMA_InitStruct.DMA_Channel_TrsfSize = 16;
DMA_Tx_ENABLE;
}
void Tim0Handler (void)
{
if (TIM_GetFlagStatus(TIM0,TIM_FLAG_OC1))
{
TIM_ClearFlag(TIM0,TIM_FLAG_OC1);
//SSP_SendData(SSP1, SSP1_Buffer_Tx[Tx_Idx++]);
//SSP_SendData(SSP1, SSP1_Buffer_Tx[/*Tx_Idx++*/ 0]);
Start_SSP1_TX_DMA(SSP1_Buffer_Tx,16);
}
if (TIM_GetFlagStatus(TIM0,TIM_FLAG_OC2))
{
TIM_ClearFlag(TIM0,TIM_FLAG_OC2);
TIM_CounterCmd(TIM0, TIM_CLEAR);
GPIO_WriteBit(GPIO3, GPIO_Pin_0, Bit_SET);
GPIO_WriteBit(GPIO3, GPIO_Pin_0, Bit_RESET);
}
}
int main()
{
#ifdef DEBUG
debug();
#endif
InitClock ();
SCU_AHBPeriphClockConfig(__VIC, ENABLE);
// VIC Deinitialization
VIC_DeInit();
// __disable_interrupt();
SCU_Configuration();
//Timer init
TIM_DeInit(TIM0);
TIM_InitTypeDef TimerInitStruct;
TIM_StructInit (&TimerInitStruct);
TimerInitStruct.TIM_Mode = TIM_OCM_CHANNEL_12;
TimerInitStruct.TIM_OC1_Modes = TIM_TIMING;
TimerInitStruct.TIM_OC2_Modes = TIM_TIMING;
TimerInitStruct.TIM_Clock_Source = TIM_CLK_APB;
TimerInitStruct.TIM_Prescaler = 2-1;
TimerInitStruct.TIM_Pulse_Length_1=48;
TimerInitStruct.TIM_Pulse_Length_2=20000;
TIM_Init (TIM0, &TimerInitStruct);
TIM_ITConfig (TIM0,TIM_IT_OC1|TIM_IT_OC2,ENABLE);
//GPIO init
//--------------------------------------------------------------
GPIO_DeInit(GPIO3);
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStruct.GPIO_Direction = GPIO_PinOutput;
GPIO_InitStruct.GPIO_Type= GPIO_Type_PushPull;
GPIO_InitStruct.GPIO_IPConnected = GPIO_IPConnected_Disable;
GPIO_InitStruct.GPIO_Alternate= GPIO_OutputAlt1;
GPIO_Init (GPIO3, &GPIO_InitStruct);
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_7;
GPIO_InitStruct.GPIO_Direction = GPIO_PinInput;
GPIO_InitStruct.GPIO_IPConnected = GPIO_IPConnected_Enable;
GPIO_InitStruct.GPIO_Alternate= GPIO_InputAlt1;
GPIO_Init (GPIO3, &GPIO_InitStruct);
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_4|GPIO_Pin_6;
GPIO_InitStruct.GPIO_Direction = GPIO_PinOutput;
GPIO_InitStruct.GPIO_Type= GPIO_Type_PushPull;
GPIO_InitStruct.GPIO_IPConnected = GPIO_IPConnected_Enable;
GPIO_InitStruct.GPIO_Alternate= GPIO_OutputAlt2;
GPIO_Init (GPIO3, &GPIO_InitStruct);
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStruct.GPIO_Direction = GPIO_PinOutput;
GPIO_InitStruct.GPIO_Type= GPIO_Type_PushPull;
GPIO_InitStruct.GPIO_IPConnected = GPIO_IPConnected_Disable;
GPIO_InitStruct.GPIO_Alternate= GPIO_OutputAlt1;
GPIO_Init (GPIO3, &GPIO_InitStruct);
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStruct.GPIO_Direction = GPIO_PinOutput;
GPIO_InitStruct.GPIO_Type= GPIO_Type_PushPull;
GPIO_InitStruct.GPIO_IPConnected = GPIO_IPConnected_Disable;
GPIO_InitStruct.GPIO_Alternate= GPIO_OutputAlt1;
GPIO_Init (GPIO3, &GPIO_InitStruct);
//--------------------------------------------------------------------------
//Èíèöèàëèçàöèÿ SPI
SSP_DeInit (SSP1);
SSP_InitTypeDef SSP_InitStructure;
SSP_InitStructure.SSP_FrameFormat= SSP_FrameFormat_Motorola;
SSP_InitStructure.SSP_Mode= SSP_Mode_Master;
SSP_InitStructure.SSP_CPOL= SSP_CPOL_High;
SSP_InitStructure.SSP_CPHA= SSP_CPHA_2Edge;
SSP_InitStructure.SSP_DataSize= SSP_DataSize_16b;
SSP_InitStructure.SSP_SlaveOutput= SSP_SlaveOutput_Disable;
SSP_InitStructure.SSP_ClockRate= 3;
SSP_InitStructure.SSP_ClockPrescaler=12;
SSP_Init(SSP1, &SSP_InitStructure);
SSP_DMACmd(SSP1, SSP_DMA_Transmit, ENABLE);
SSP_Cmd(SSP1, ENABLE);
// Èíèöèàëèçàöèÿ DMA
/*
DMA_DeInit();
DMA_StructInit(&DMA_InitStruct);
DMA_InitStruct.DMA_Channel_LLstItm= 0;
DMA_InitStruct.DMA_Channel_SrcAdd= (u32)&SSP1_Buffer_Tx;
DMA_InitStruct.DMA_Channel_DesAdd=(u32)(&SSP1->DR);
DMA_InitStruct.DMA_Channel_SrcWidth= DMA_SrcWidth_HalfWord;
DMA_InitStruct.DMA_Channel_DesWidth= DMA_DesWidth_HalfWord;
DMA_InitStruct.DMA_Channel_DesBstSize = DMA_DesBst_1Data;
DMA_InitStruct.DMA_Channel_FlowCntrl= DMA_FlowCntrl1_DMA;
DMA_InitStruct.DMA_Channel_Src = DMA_SRC_SSP1_TX;
DMA_InitStruct.DMA_Channel_Des = DMA_DES_SSP1_TX;
DMA_InitStruct.DMA_Channel_TrsfSize = 16;
DMA_SyncConfig(DMA_SSP1_TX_Mask, ENABLE);
DMA_Init(DMA_Channel0,&DMA_InitStruct);
DMA_ChannelSRCIncConfig (DMA_Channel0, ENABLE);
// DMA_ChannelDESIncConfig (DMA_Channel0, ENABLE);
DMA_ITConfig(DMA_Channel0, ENABLE);
DMA_ITMaskConfig(DMA_Channel0, DMA_ITMask_ITC, ENABLE);
DMA_ChannelCmd (DMA_Channel0,ENABLE);
DMA_Cmd(ENABLE);
*/
// Èíèöèàëèçàöèÿ êîíòðîëëåðà ïðåðûâàíèé
// VIC_DeInit();
// âêëþ÷àåì ïðåðûâàíèÿ ïî òàéìåðó
TIM_CounterCmd(TIM0, TIM_START);
VIC_Config (TIM0_ITLine , VIC_IRQ , 1);
VIC_Config (DMA_ITLine, VIC_IRQ , 2);
VIC_ITCmd(TIM0_ITLine, ENABLE);
VIC_ITCmd(DMA_ITLine , ENABLE);
// __enable_interrupt();
while(1)
{
// while(SSP_GetFlagStatus(SSP1, SSP_FLAG_RxFifoNotEmpty)==RESET){};
}
}
. Это в том случае если SPI работает в режиме MASTER. Если SPI работает в режиме SLAVE то тут вобще сказка, ничего запускать не надо, создаете на DMA кольцевой буфер, запускаете ПДП и SPI и все будет автоматом крутится, а по внешнему прерыванию начинаете вашу обработку, примерно так.
