裸机下的SPI通讯终于搞定了，datasheet就是在胡说八道啊！！
发现数据手册不能信啊。。。说是SPI初始化的时候要发10个0xFF，还有在接收的时候也得同时发0xFF，这简直是误导人啊！！刚刚发现只要把这两个地方的代码删掉，就可以正常通信了，我的程序中以SPI_0为主设备，SPI_1为从设备：#include "2440addr.h"
#include "2440lib.h"
/* SPI_0 */
#define MISO0 11 /* GPE11:SPI输入*/
#define GET_MISO0() ((rGPEDAT & (1<<MISO0)) >> MISO0)
#define MOSI0 12 /* GPE12:SPI输出*/
#define SET_MOSI0(value) (rGPEDAT = (rGPEDAT & ~(1<<MOSI0)) | (value<<MOSI0))
#define SCK013 /* GPE13:SPI输出*/
#define SET_SCK0(value) (rGPEDAT = (rGPEDAT & ~(1<<SCK0)) | (value<<SCK0))
#define CE0 14 /* GPG14:数字输出 */
#define SET_CE0(value) (rGPGDAT = (rGPGDAT & ~(1<<CE0)) | (value<<CE0))
#define GET_CE0() ((rGPGDAT & (1<<CE0)) >> CE0)
#define CSN02/* GPG2: SPI输出*/
#define SET_CSN0(value) (rGPGDAT = (rGPGDAT & ~(1<<CSN0)) | (value<<CSN0))
#define IRQ013 /* GPG13: 中断输入 */
#define GET_IRQ0() ((rGPFDAT & (1<<IRQ0)) >> IRQ0)
/* SPI_1 */
#define MISO1 5/* GPG5:SPI输入*/
#define GET_MISO1() ((rGPGDAT & (1<<MISO1)) >> MISO1)
#define MOSI1 6/* GPG6:SPI输出*/
#define SET_MOSI1(value) (rGPGDAT = (rGPGDAT & ~(1<<MOSI1)) | (value<<MOSI1))
#define SCK17/* GPG7:SPI输出*/
#define SET_SCK1(value) (rGPGDAT = (rGPGDAT & ~(1<<SCK1)) | (value<<SCK1))
#define CE1 0/* GPG0:数字输出 */
#define SET_CE1(value) (rGPGDAT = (rGPGDAT & ~(1<<CE1)) | (value<<CE1))
#define GET_CE1() ((rGPGDAT & (1<<CE1)) >> CE1)
#define CSN13/* GPG3: SPI输出*/
#define SET_CSN1(value) (rGPGDAT = (rGPGDAT & ~(1<<CSN1)) | (value<<CSN1))
#define IRQ111 /* GPG11: 中断输入 */
#define GET_IRQ1() ((rGPGDAT & (1<<IRQ1)) >> IRQ1)
static void usDelay(U32 uSeconds, void __irq (*PwmIsr)(void)) {
// set ISR for PWM Timer 4
if (PwmIsr != NULL) {
ClearPending(BIT_TIMER4);
pISR_TIMER4 = (U32) PwmIsr;
EnableIrq(BIT_TIMER4);
}
// timer input clock frequency = PCLK / (24 + 1) / 2 = 1 MHz
rTCFG0 &= ~(0xff << 8); // clear TCFG0(Prescaler 1) to 0
rTCFG0 |= 24 << 8; // Prescaler 1 = 24
rTCFG1 &= ~(0xf << 16); // clear TCFG1(MUX 4) to 0
rTCFG1 |= 0 << 16; // MUX 4 = 0000 = 1/2
rTCNTB4 = uSeconds; // use PWM Timer 4, the initial count value is uSeconds
rTCON &= ~(0x7 << 20); // clear TCON to 0
rTCON |= 0x0 << 22; // one-shot
rTCON |= 0x1 << 21; // manula update TCNTB4
rTCON |= 0x1 << 20; // start for Timer 4
rTCON &= ~(0x1 << 21); // clear TCON(Timer 4 Manual Update) to zero
while(rTCNTO4)
;
}
static void InitSpi(void) {
// 设置时钟控制寄存器（CLKCON），使能SPI时钟
rCLKCON = (rCLKCON & ~(1 << 18)) | (1 << 18);
// SPI0为主设备
// 初始化GPE GPE11:MISO0(MISO)；GPE12:MOSI0(MOSI)；GPE13:SPICLK0(SCK)
rGPECON = (rGPECON & ~(3 << MISO0 * 2 | 3 << MOSI0 * 2 | 3 << SCK0 * 2)) |
(2 << MISO0 * 2 | 2 << MOSI0 * 2 | 2 << SCK0 * 2);
// 初始化GPG GPG13：GPG2: nSS_SPI0(CSN)
rGPGCON = (rGPGCON & ~(3 << CSN0 * 2)) | (1 << CSN0 * 2);
// 设置波特率预定标器寄存器（SPPREn），波特率 = PCLK / 2 / （预定标器值 + 1） = 1MHz
rSPPRE0 = 0x18;
// 设置SPCONn寄存器以正确配置SPI模块
// normal; format A; active high; master; enable; polling mode
rSPCON0 = (rSPCON0 & ~(1 << 0 | 1 << 1 | 1 << 2 | 1 << 3 | 1 << 4 | 3 << 5)) |
(0 << 0 | 0 << 1 | 0 << 2 | 1 << 3 | 1 << 4 | 0 << 5);
// 设置SPI引脚控制寄存器（SPPINn）
// Release; Disable (general purpose)
rSPPIN0 = (rSPPIN0 & ~(1 << 0 | 1 << 2)) | (0 << 0 | 0 << 2);
// SPI1为从设备
// 初始化GPG GPG5:MISO1(MISO)；GPG6:MOSI1(MOSI)；GPG7:SPICLK1(SCK)
// GPG3: nSS_SPI1(CSN)
rGPGCON = (rGPGCON & ~(3 << MISO1 * 2 | 3 << CSN1 * 2 | 3 << MOSI1 * 2 | 3 << SCK1 * 2)) |
(3 << MISO1 * 2 | 3 << CSN1 * 2 | 3 << MOSI1 * 2 | 3 << SCK1 * 2);
// 设置波特率预定标器寄存器（SPPREn），波特率 = PCLK / 2 / （预定标器值 + 1） = 1MHz
rSPPRE1 = 0x18;
// 设置SPCONn寄存器以正确配置SPI模块
// normal; format A; active high; master; enable; polling mode
rSPCON1 = (rSPCON1 & ~(1 << 0 | 1 << 1 | 1 << 2 | 1 << 3 | 1 << 4 | 3 << 5)) |
(0 << 0 | 0 << 1 | 0 << 2 | 0 << 3 | 0 << 4 | 0 << 5);
// 设置SPI引脚控制寄存器（SPPINn）
// Release; Disable (general purpose)
rSPPIN1 = (rSPPIN1 & ~(1 << 0 | 1 << 2)) | (0 << 0 | 0 << 2);
}
static void Spi0Send(char uch) {
char temp;
// 将nSS（CSN）引脚设为低电平，激活SPI模块
SET_CSN0(0);
usDelay(1, NULL);
rSPTDAT0 = uch;
// 判定SPSTAn寄存器的REDY标志
while (!(rSPSTA0 & 0x01))
;
// 将nSS（CSN）引脚设为高电平，关闭SPI模块
SET_CSN0(1);
usDelay(1, NULL);
}
static char Spi1Receive(void) {
char temp;
// 判定SPSTAn寄存器的REDY标志
while (!(rSPSTA1 & 0x01))
;
temp = rSPRDAT1;
return temp;
}
void SpiTest(void) {
int value = 0xDE;
InitSpi();
Uart_Printf("\nSPI_0 Sent 0x%X\n", value);
Spi0Send(value);
Uart_Printf("\nSPI_1 Recieved 0x%X\n", Spi1Receive());
} 初始化的时候要发10个0xFF，那个是初始化MMC和SD卡时的吧！ 有可能吧，SPI使用的通用用法datasheet上也没写，只好照它写的示例做，结果杯具了 这个移位控制搞得真麻烦 数据手册确实不能全信了！
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