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本帖最后由 xxguo 于 2012-10-2 20:50 编辑
现有STC12C5616和CC2530两个单片机。需要两个单片机SPI通信（5616为master，2530为slaver），请问现在有哪些需要注意的问题呢？
我已经实现5616和5616之间的SPI以及2530与2530之间的SPI通信。但是交叉之后就是没有反应，不知道可能是哪里的问题呢？
/*******************************************************************************
date : 2010/08/29
writer ：on the way..
Port ：P0_2,P0_3,P0_4,P0_5 这四个端口是用于UART0外设配置
P1_0，P1_1 这两个端口是LED1和LED2
P1_4,P1_5,P1_6,P1_7 这四个端口用于SPI通信
fuction：SPI_DMA中断方式通信
从模式：配置好DMA的参数，使能DMA中断之后，开启DMA，如
果串口1有接收到数据，这是会触发DMA，传输数据到指定的数组
rxBufferSlave中，这里是可以将整个字符串直接传送过来的，最
后在串口调试助手中显示on the way..
*******************************************************************************/
/*--------------------------------------------------------------------------------
Master Slave
------------- -------------
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|P1_4 SSN |--------->|SSN P1_4|
| | | |
|P1_5 SCK |--------->|SCK P1_5|
| | | |
|P1_6 MOSI|--------->|MOSI P1_6|
| | | |
|P1_7 MISO|<---------|MISO P1_7|
| | | |
------------- -------------
--------------------------------------------------------------------------------*/
// Slave Mode
#include <iocc2530.h>
#include "hal_cc8051.h"
#define LED1 P1_0
#define LED2 P1_1
#define LED_OFF 1
#define LED_ON 0
#define SSN P1_4
#define N 13 // Length byte
char rxBufferSlave[13];//接收到的数据放到这个数组中
BOOL sDataReceived; //接收数据标志位
/******************************************************************************
* @fn init_port
*
* @brief
* Initializes components IO port application example.
*
* Parameters:
*
* @param void
*
* @return void
*
******************************************************************************/
void init_port(void)
{
IO_FUNC_PORT_PIN(1, 0, IO_FUNC_GIO); //将P1_0设置为普通的IO口
IO_DIR_PORT_PIN(1, 0, IO_OUT); //设置为输出
IO_FUNC_PORT_PIN(1, 1, IO_FUNC_GIO); //将P1_1设置为普通的IO口
IO_DIR_PORT_PIN(1, 1, IO_OUT); //设置为输出
PERCFG |= 0x02; // PERCFG.U1CFG = 1
P1SEL |= 0xF0; // P1_7, P1_6, P1_5, and P1_4 are peripherals
}
void init_Baudrate(void)
{
// a 32 MHz crystal,
// max baud rate = 32 MHz / 8 = 4 MHz.
U1BAUD = 0x00; // BAUD_M = 0
U1GCR |= 0x11; // BAUD_E = 17
}
/******************************************************************************
* @fn initUART
*
* @brief
* Initializes components for the UART application example.
*
* Parameters:
*
* @param void
*
* @return void
*
******************************************************************************/
void initUART(void)
{
// Setup for UART0
IO_PER_LOC_UART0_AT_PORT0_PIN2345();//将端口0的2345设置为外设
//这里的串口0设置为：波特率57600，没有校验位，8位数据，1位停止位，
UART_SETUP(0, 57600, HIGH_STOP); //设置串口
}
/*******************************************************************************
* @fn main
*
* @brief
*
* @param none
*
* @return none
*******************************************************************************/
void main(void)
{
uint8 i;
halMcuInit(); //设置时钟源32MHZ
init_port(); //初始化端口
init_Baudrate(); //初始化波特率
initUART(); //初始化UART
// SPI Slave Mode
U1CSR &= ~0x80;
U1CSR |= 0x20;
// Configure phase, polarity, and bit order
U1GCR |= 0xC0; // CPOL = CPHA = 1
U1GCR &=~0x20; // ORDER = 1
// 1. Clear interrupt flags
// For pulsed or edge shaped interrupt sources one should clear the CPU interrupt
// flag prior to clearing the module interrupt flag
TCON &= ~0x80;
// 2. Set individual interrupt enable bit in the peripherals SFR, if any
// 3. Set the corresponding individual, interrupt enable bit in the IEN0, IEN1, or
// IEN2 registers to 1
URX1IE = 1;
// SPI Slave
//-------------------------------------------------------------------------------
DMA_DESC dmaConfigRx;
SET_WORD(dmaConfigRx.SRCADDRH, dmaConfigRx.SRCADDRL, &X_U1DBUF);
SET_WORD(dmaConfigRx.DESTADDRH, dmaConfigRx.DESTADDRL, rxBufferSlave);
dmaConfigRx.VLEN = 0; // Transfer number of bytes commanded by n, + 1
SET_WORD(dmaConfigRx.LENH, dmaConfigRx.LENL, N + 1); //LEN = nmax + 1
dmaConfigRx.WORDSIZE = 0; // Each transfer is 8 bits
dmaConfigRx.TRIG = 17; // Use URX1 trigger 17
dmaConfigRx.TMODE = 0; // One byte transferred per trigger event 0
dmaConfigRx.SRCINC = 1; // Keep the same source addr. for all transfers 0
dmaConfigRx.DESTINC = 0; // Increase dest. addr. by 1 between transfers 1
dmaConfigRx.IRQMASK = 1; // Allow IRCON.DMAIF to be asserted when the transfer 1
// count is reached
dmaConfigRx.M8 = 0; // Use all 8 bits of first byte in source data to
// determine the transfer count
dmaConfigRx.PRIORITY = 2; // DMA memory access has high priority
// Save pointer to the DMA config. struct into DMA ch. 0 config. registers
SET_WORD(DMA0CFGH, DMA0CFGL, &dmaConfigRx);
//-------------------------------------------------------------------------------
//-------------------------------------------------------------------------------
// 1. Clear interrupt flags
// For pulsed or edge shaped interrupt sources one should clear the CPU interrupt
// flag prior to clearing the module interrupt flag
DMAIF = 0; //清除DMA中断标志位
DMAIRQ &= ~0x01;
// 2. Set individual interrupt enable bit in the peripherals SFR, if any
// No flag for the DMA (Set in the DMA struct (IRQMASK = 1))
// 3. Set the corresponding individual, interrupt enable bit in the IEN0, IEN1, o
// IEN2 registers to 1
DMAIE = 1; //使能DMA中断
// 4. Enable global interrupt
EA = 1; //使能总中断
//-------------------------------------------------------------------------------
//-------------------------------------------------------------------------------
DMAARM = 0x01; //使得DMA通道0处于准备好的状态，如果有数据接收到，就会执行中断语句
while (1)
{
if (sDataReceived)
{
sDataReceived = FALSE; // All 10 bytes are received
for(i=0;i<sizeof(rxBufferSlave)+1;i++)
{
U0DBUF = rxBufferSlave;
while(UTX0IF == 0); //等待发送完毕
UTX0IF = 0;
}
}
}
}
#pragma vector=DMA_VECTOR
__interrupt void dma_IRQ(void)
{
DMAIF = 0; // Clear the CPU DMA interrupt flag
DMAIRQ &= ~0x01; // DMA channel 0 module interrupt flag
sDataReceived = TRUE; // All 10 bytes are received
}
//-------------------------------------------------------------------------------
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阿莫论坛20周年了！感谢大家的支持与爱护！！
一只鸟敢站在脆弱的枝条上歇脚，它依仗的不是枝条不会断，而是自己有翅膀，会飞。
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发表于 2012-10-2 20:41:08
楼主
