This project forked from xujunjie96/dac8831
DAC8831 by STM32F407
功能说明 串口设置DAC8831输出电压值；主控MCU为STM32F407ZGT6.
硬件连接 VD ------> 3.3V GD ------> GND
IN+ ------> +12V(7-15V)
GND ------> GND
CS1 ------> PG15
CS2 ------> PG14
SCLK ------> PB3
SDI ------> PB5
协议 '$' + '模式符号' + '小数' + '\r\n' 模式符号：'' 修改校正系数 '+' 通道1输出，通道2置0 '-' 通道2输出，通道1置0
如"$+2.35\r\n" 表示通道1输出2.35V电压，通道2输出0V电压 "$-4.44\r\n" 表示通道2输出4.44V电压，通道1输出0V电压 "$\1.025412\r\n" 表示校正系数为1.025412 ( 校准系数计算方式： 先将校正系数设置为1，设置电压输出，测量实际输出电压值； 校正系数=设置输出电压值 / 实际输出电压值；最好保留6位有效数字。 )
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