HXDSP2441

1.SPI

1.1裸机

HXDSP2441在BSP中提供的SPI裸机驱动接口具体查询《HXDSP2441裸机驱动用户手册》4.4。需要特别说明的是，因为BSP内提供的所有SPI相关接口均针对Flash器件，如果SPI所控为非Flash器件，则需要仔细阅读BSP源码并在必要时重新实现驱动接口。由于Demo板通过SPI接口控制ADC器件（MAX11635），所以对BSP的SPI相关源码进行修改，以下涉及源码文件均在BSP包的drivers/spi/文件夹下。

以spi_write接口为例，分析其调用路径：

spi_write(spidrv.c)->spi_transfer_wait(spidrv.c)->spi_transfer_wait_poll(spidrv.c)->spi_transfer(spidrv.c)->spi_unload(spidrv.c)->spi_transfer_data(spidrv.c)->handle_message(spidrv.c)->resolve_command(spi_bus.c)

spi_write传入spi_bus结构体，最终由resolve_command函数解析结构体成员spi_bus.spi_message.flag进而确认SPI操作Flash的命令字，原本flag为SPI_WRITE时对应写flash_readwrite的写功能，将flash_readwrite对应改为我自己实现的spi_readwrite函数，spi_read接口同理，spi_readwrite函数实现如下（spi_readwrite接口并不需要device_type，只为与原有接口保持一致）。

 1 /*
 2  *功能：SPI RAW 读写
 3  *参数：总线结构
 4  */
 5 spi_status_code spi_readwrite(spi_bus *bus,uint32_t device_type){
 6   uint64_t base = bus->base;
 7   uint32_t status = 0;
 8 
 9   /*
10    * 写入的字节数
11    */
12   int count = bus->msg->len;
13   /*
14    * 写入的缓冲区
15    */
16   uint8_t *wbuf = bus->msg->buf;
17   uint8_t *rbuf = bus->msg->buf;
18   epos_interrupt_disable(0);
19   uint32_t fake_data = 0;
20   uint32_t tx_cnt=0, rx_cnt=0;
21   for(;tx_cnt<count || rx_cnt < count;){
22       status = *((volatile uint32_t*)base + SSI_SR_OFFSET);
23       if((tx_cnt<count) && (status & SR_TFNF)){
24           *((volatile uint32_t*)base + SSI_DR_OFFSET) = wbuf[tx_cnt];
25           tx_cnt++;
26       }
27       if((rx_cnt < count) && (status & SR_RFNE)){
28           rbuf[rx_cnt] = *((volatile uint32_t*)base + SSI_DR_OFFSET);
29           rx_cnt++;
30       }
31   }
32   wait_spi_completion(base);
33   epos_interrupt_enable(0);
34 
35    return SPI_SUCCESSFUL;
36 }

2.I2C

HXDSP2441在BSP中提供通过I2C协议与EEPROM进行通信的接口，Demo板通过M24M01器件对I2C接口进行测试，测试代码如下。

 1 #define CONFIGURE_INIT
 2 
 3 #include <drivers/xconfig_baseparm.h>
 4 
 5 #include "sys_cfg.h"
 6 
 7 #define I2C_DEV_NO 0
 8 #define I2C_BUS_NO 0
 9 #define DATA_SIZE 256
10 
11 int main(int argc, char* argv[]) {
12     i2c_status_code ret = 0;
13     int slave_addr = 0x50;
14     epos_libio_init_args_t init_args = {
15         .data0 = (I2C_BUS_NO) | (slave_addr << 16)};
16 
17     ret = m24m01_driver_initialize(I2C_DEV_NO, &init_args);
18     if (ret != I2C_SUCCESSFUL) {
19         printf("m24m01_driver_initialize fail.\n");
20         return -1;
21     }
22 
23     epos_libio_rw_args_t rw_args;
24 
25     char send_buf[DATA_SIZE];
26 
27     for (int i = 0; i < DATA_SIZE; i++)
28         send_buf[i] = 0x5a + i;
29 
30     rw_args.data0 = 0;    // 总线号
31 
32     rw_args.buffer = send_buf;    // 发送缓冲区的首地址
33     rw_args.count = DATA_SIZE;        // 发送数量
34     rw_args.offset = 0;
35 
36     ret = m24m01_driver_write(0, &rw_args);
37     if (ret != I2C_SUCCESSFUL) {
38         printf("i2cmaster_driver_write fail.\n");
39         return -1;
40     }
41 
42 
43     char recv_buf[DATA_SIZE];
44     memset(recv_buf, 0, sizeof(recv_buf));
45     rw_args.data0 = 0;    // 总线0
46 
47     rw_args.count = DATA_SIZE;        // 读取数量
48     rw_args.buffer = recv_buf;    // 读取至内存的首地址
49     ret = m24m01_driver_read(0, &rw_args);
50 
51     if (ret != I2C_SUCCESSFUL){
52         printf("i2cmaster_driver_read fail.\n");
53         return -1;
54     }
55 
56     int check_ok = 1;
57 
58     for(int i=0;i<DATA_SIZE;i++){
59         if(recv_buf[i] != send_buf[i]){
60             printf("M24M01 byte%d check fail, expect 0x%x but get 0x%x\n", i, send_buf[i], recv_buf[i]);
61             check_ok = 0;
62 //            break;
63         }
64     }
65     if(check_ok){
66         printf("M24M01 check pass.\n");
67     }
68 
69 
70     return 0;
71 }

posted on 2023-11-24 10:48 -leanard- 阅读(61) 评论(0) 收藏举报

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