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https://e2e.ti.com/support/tools/code-composer-studio-group/ccs/f/code-composer-studio-forum/813925/ccs-ucd3138-ucd3138
工具/软件：Code Composer Studio
TI 代码 #define K_FEED _Forward (((uint32)(0.5 * VAC_MIN_OFF * 1.414 * VAC_VOLTGE_DEV_DEVIDER * 0x7FFFFFFF))//Q30
我认为浮点至 Q30应该为 MUL 2^30
但 TI 代码是 MUL 0X7FFFFFFF
为什么？
谢谢
一位专家很快会回来
0x7FFFFFFF 为 Q31
(0.5 * 0x7FFFFFFF)为 Q30
#define K_FEED _Forward (((uint32)(0.5 * VAC_MIN_OFF * 1.414 * VAC_VOLTGE_DEV_DEVIDER * 0x7FFFFFFF))//Q30
0.5 IF 从0.5*Kvin*Vmin (pk)
0.5*Kvin*Vmin (pk) = 0.5 * VAC_MIN_OFF * 1.414 * VAC_VOLTGE_DEVIDER
是的、0.5就在这里、在乘以0.5后 、0x7FFFFFFF 变为30位、我们将其称为 Q30
