STM32驱动MAX5481

MAX5481数字电位器，SIP通讯或者脉冲步进，这里的驱动是SPI驱动。数据手册https://shaynerain.com/shaynerain/file/MAX5481-MAX5484.pdf

1. 首先是SPI的配置
   
2. 驱动较为简单，先发送命令然后是数据

   #define WRITE_WIPER 0X00
   
   #define WRITE_EEPROM 0X20
   
   #define COPY_EEPROM_TO_WIPER 0X30
   
   void max5481_write(SPI_HandleTypeDef* hspi, uint8_t cmd, uint16_t data)
   
   {
   
   uint8_t tx_buf[3];
   
   uint16_t i=0;
   
   tx_buf[0] = cmd;
   
   tx_buf[1] = (uint8_t)(0xff&(data>>2));
   
   tx_buf[2] = (uint8_t)(0xff&(data<<6));
   
   CS_L;
   
   //HAL_Delay(1);
   
   while(i++>1000){}i=0;
   
   if(cmd == WRITE_WIPER)
   
   {
   
   HAL_SPI_Transmit(hspi, &tx_buf[0], 3, 500);
   
   }
   
   else
   
   HAL_SPI_Transmit(hspi, &tx_buf[0], 1, 500);
   
   while(i++>1000){}i=0;
   
   //HAL_Delay(1);
   
   CS_H;
   
   }

闻道有先后 术业有专攻