，我用两个，一个用master，初始化为用的USART 0 alternate location 1
#define SCK P0_5
#define MISO P0_2
#define MOSI P0_3
#define CS P0_4
PERCFG |= 0x00
// P1SEL |= 0x38;
P0SEL |= 0x2C;
// Configure CS (P05) as output
P0DIR |= 0x10;
CS = CS_DISABLED;
//*** Setup the SPI interface *** // SPI master mode
U0CSR = 0x00; // Negative clock polarity, Phase: data out on CPOL -> CPOL-inv // data in on CPOL-inv -> CPOL // MSB first U0GCR = 0x20; // SCK frequency = 480.5kHz (max 500kHz)
U0GCR |= 0x0D;
U0BAUD = 0xEC;
slave端为
#define SCK P0_5
#define MISO P0_2
#define MOSI P0_3
#define CS P0_4
PERCFG |= 0x00
// P1SEL |= 0x38;
P0SEL |= 0x2C; // Configure CS (P05) as output
P0DIR |= 0x10;
CS = CS_DISABLED;
//*** Setup the SPI interface ***
// SPI master mode
U0CSR=0x20; 这个变化了一下 // Negative clock polarity, Phase: data out on CPOL -> CPOL-inv //
U0GCR = 0x20; // SCK frequency = 480.5kHz (max 500kHz)
U0GCR |= 0x0D;
U0BAUD = 0xEC;
//写函数
void spiWriteByte(uint8 write) {
CS = CS_ENABLED;
WAIT_1_3US(2);
U0CSR &= ~0x02; // Clear TX_BYTE
U0DBUF = write;
while (!(U0CSR & 0x02)); // Wait for TX_BYTE to be set
CS = CS_DISABLED;
}
读
void spiReadByte(uint8 *read, uint8 write) {
CS = CS_ENABLED;
WAIT_1_3US(2);
U0CSR &= ~0x02; // Clear TX_BYTE
U0DBUF = write;
while (!(U0CSR & 0x02)); // Wait for TX_BYTE to be set
*read = U0DBUF;
CS = CS_DISABLED;
}
这样传输数据时不正常，，这个代码是cma3000.c里改了一下，
