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LPC2000開(kāi)發(fā)板I2C的問(wèn)題！ |
| 作者：zhaoyk1981 欄目：ARM技術(shù) |
我寫(xiě)I2C程序中SI位1時(shí)，用LDR R0, =I2CONCLR MOV R1, #0x2C STR R1, [R0] 無(wú)法把SI位清掉 為什么呢？ 全部源程序如下： main LDR R0, =PINSEL0 MOV R1, #0x55 STR R1, [R0] LDR R0, =I2SCLL MOV R1, #0x48 STR R1, [R0] LDR R0, =I2SCLH STR R1, [R0] LDR R0, =I2CONCLR MOV R1, #0x2C STR R1, [R0] LDR R0, =I2CONSET MOV R1, #0x40 STR R1, [R0] ;以上是對(duì)I2C初始化 BL START_I2C MOV R2, #0xA0 BL SENDBYTE_I2C MOV R2, #0x00 BL SENDBYTE_I2C MOV R2, #0x39 BL SENDBYTE_I2C BL STOP_I2C BL START_I2C MOV R2, #0xA0 BL SENDBYTE_I2C MOV R2, #0x00 BL SENDBYTE_I2C ; BL STOP_I2C BL START_I2C MOV R2, #0xA1 BL SENDBYTE_I2C BL RCVBYTE_I2C MOV R2, R1 BL STOP_I2C ********************************************** START_I2C LDR R0, =I2CONSET MOV R1, #0x20 STR R1, [R0] START_I2C1 LDR R1, [R0] ANDS R1, R1, #0x08 BEQ START_I2C1 MOV PC, LR SENDBYTE_I2C LDR R0, =I2DAT MOV R1, R2 STR R1, [R0] LDR R0, =I2CONCLR MOV R1, #0x28 STR R1, [R0] SENDBYTE_I2C1 LDR R0, =I2CONSET LDR R1, [R0] ANDS R1, R1, #0x08 BEQ SENDBYTE_I2C1 MOV PC, LR RCVBYTE_I2C LDR R0, =I2CONCLR MOV R1, #0x0C STR R1, [R0] RCVBYTE_I2C1 LDR R0, =I2CONSET LDR R1, [R0] ANDS R1, R1, #0x08 BEQ RCVBYTE_I2C1 LDR R0, =I2DAT LDR R1, [R0] MOV PC, LR STOP_I2C LDR R0, =I2CONSET MOV R1, #0x10 STR R1, [R0] LDR R0, =I2CONCLR MOV R1, #0x28 STR R1, [R0] MOV PC, LR |
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