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本帖最后由 ghoulich 于 2011-12-26 10:22 编辑
#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 SCK0 13 /* 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 CSN0 2 /* GPG2: SPI输出 */
#define SET_CSN0(value) (rGPGDAT = (rGPGDAT & ~(1<<CSN0)) | (value<<CSN0))
#define IRQ0 13 /* 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 SCK1 7 /* 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 CSN1 3 /* GPG3: SPI输出 */
#define SET_CSN1(value) (rGPGDAT = (rGPGDAT & ~(1<<CSN1)) | (value<<CSN1))
#define IRQ1 11 /* 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[15:8](Prescaler 1) to 0
rTCFG0 |= 24 << 8; // Prescaler 1 = 24
rTCFG1 &= ~(0xf << 16); // clear TCFG1[19:16](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[22:20] 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[21](Timer 4 Manual Update) to zero
while(rTCNTO4)
;
}
static void InitSpi(void) {
int i;
// 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);
// 初始化SPI模块,向SPTDATn写入10次0xFF哑数据
for(i = 0; i < 10; i++) {
rSPTDAT0 = 0xFF;
rSPTDAT1 = 0xFF;
}
}
static char 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);
// 发送流程,若uch不为NULL,则开始发送;若uch为NULL,则自动发送哑数据
if (uch != NULL)
rSPTDAT0 = uch;
else
rSPTDAT0 = 0xFF;
// 判定SPSTAn寄存器的REDY标志
while (!(rSPSTA0 & 0x01))
;
// 接收流程,初始化时已经配置为TAGD位,没有数据发送时自动发送哑数据
temp = rSPRDAT0;
// 将nSS(CSN)引脚设为高电平,关闭SPI模块
SET_CSN0(1);
usDelay(1, NULL);
Uart_Printf("\nSPTDAT0 = 0x%x\n", rSPTDAT0);
Uart_Printf("Send Complete!");
return temp;
}
static char Spi1Receive(char uch) {
char temp;
// 发送流程,若uch不为NULL,则开始发送;若uch为NULL,则自动发送哑数据
if (uch != NULL)
rSPTDAT1 = uch;
else
rSPTDAT1 = 0xFF;
// 判定SPSTAn寄存器的REDY标志
while (!(rSPSTA1 & 0x01))
;
// 接收流程,初始化时已经配置为TAGD位,没有数据发送时自动发送哑数据
temp = rSPRDAT1;
Uart_Printf("\nSPRDAT1 = 0x%x\n", rSPRDAT1);
Uart_Printf("Receive Complete!");
return temp;
}
void SpiTest(void) {
InitSpi();
Spi0Send(0xDE);
Spi1Receive(NULL);
}
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