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feat(spi):update spi mode to MODE_2 to match MCU

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zhimin.liu
2026-07-02 14:38:23 +08:00
parent aa98124c35
commit a699f03d72
2 changed files with 46 additions and 21 deletions
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source/spi_dev/spi4test
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source/spi_dev/spi4test.c
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@@ -27,14 +27,21 @@
/* ========== SPI配置（必须与MCU主设备完全一致）========== */
#define SPI_DEVICE "/dev/spidev4.0"
#define SPI_MODE SPI_MODE_0 /* CPOL=1, CPHA=1 */
#define SPI_MODE SPI_MODE_2 /* CPOL=1, CPHA=1 */
#define SPI_BITS 8
#define SPI_SPEED 1000000 /* 1MHz */
#define FRAME_LEN 128 /* 每帧64字节 */
#define FRAME_LEN 128 /* 每帧256字节 */
/* ===================================================== */
static volatile int keep_running = 1;
static int is_all_zero(const uint8_t *buf, int len) {
for (int i = 0; i < len; i++)
if (buf[i] != 0)
return 0;
return 1;
}
void sigint_handler(int sig) {
(void)sig;
keep_running = 0;
@@ -43,7 +50,13 @@ void sigint_handler(int sig) {
int main(void)
{
uint8_t buf[FRAME_LEN];
uint8_t rx_buf[FRAME_LEN];
uint8_t tx_buf[FRAME_LEN] = {0xAA, 0xBB, 0xCC, 0xDD};
tx_buf[FRAME_LEN-4] = 0x11;
tx_buf[FRAME_LEN-3] = 0x22;
tx_buf[FRAME_LEN-2] = 0x33;
tx_buf[FRAME_LEN-1] = 0x44;
int fd, ret;
unsigned int frame_count = 0;
@@ -105,32 +118,44 @@ int main(void)
/* 6. 循环接收数据 */
while (keep_running) {
memset(buf, 0, FRAME_LEN);
ret = read(fd, buf, FRAME_LEN);
memset(rx_buf, 0, FRAME_LEN);
struct spi_ioc_transfer tr = {
.tx_buf = (unsigned long)tx_buf,
.rx_buf = (unsigned long)rx_buf,
.len = FRAME_LEN,
.speed_hz = SPI_SPEED,
.bits_per_word = SPI_BITS,
};
ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
if (ret < 0) {
perror("read");
perror("spi transfer");
break;
} else if (ret == 0) {
/* 非阻塞模式可能返回0，但这里用了阻塞模式，一般不会出现 */
//continue;
}
ret = FRAME_LEN; /* transfer 成功则返回 FRAME_LEN */
frame_count++;
/* 只有 tx 或 rx 数据不全为零时才打印 */
if (is_all_zero(tx_buf, FRAME_LEN) && is_all_zero(rx_buf, FRAME_LEN))
continue;
printf("\n========== Frame #%u (%d bytes) ==========\n", frame_count, ret);
printf("HEX : ");
for (int i = 0; i < ret; i++)
printf("0x%02X ", buf[i]);
printf("\n");
printf("ASCII: ");
for (int i = 0; i < ret; i++)
printf(" %c ", (buf[i] >= 0x20 && buf[i] < 0x7F) ? buf[i] : '.');
printf("\n");
if (!is_all_zero(tx_buf, FRAME_LEN)) {
printf("TX HEX: ");
for (int i = 0; i < ret; i++)
printf("0x%02X ", tx_buf[i]);
printf("\n");
}
if (!is_all_zero(rx_buf, FRAME_LEN)) {
printf("RX HEX: ");
for (int i = 0; i < ret; i++)
printf("0x%02X ", rx_buf[i]);
printf("\n");
}
printf("DEC : ");
for (int i = 0; i < ret; i++)
printf("%3d ", buf[i]);
printf("\n");
printf("=========================================\n");
}