Maxim-integrated MAXQ Family Users Guide: MAXQ2010 Supplement Manual do Utilizador descarregar pdf (Página 130)

MAXQ Family User’s Guide:

MAXQ2010 Supplement

22-7

22.2 I

C Code Examples

22.2.1 I

C Example 1: Master Mode Transmit

; I2C configured as master, transmit to slave address 08h

; Setup for Master Mode Transmit

move I2CCN, #003h ; I2CEN = 1, I2CMST = 1

call wait_busy ; Polling routine to wait for I2CBUSY to clear

move I2CCN, #043h ; I2CEN = 1, I2CMST = 1, I2CMODE = 0, I2CSTART = 1

call wait_start ; Polling routine to wait for I2CSTART to clear

call wait_busy ; Polling routine to wait for I2CBUSY to clear

move I2CIE.1, #01h ; Enable Transmit Complete Interrupt

move I2CBUF, #008h ; Slave address set to 08h

call wait_tx_complete ; Wait for transmit interrupt

;; Verify ACK from slave

move ACC, I2CST ; Move I2C Status Register to accumulator

and #080h ; Check for NACK bit set in status register

cmp #000h

jump ne, FAIL ; If NACK bit set, handle retransmission, else continue

move I2CBUF, #0aah ; Byte to transmit

call wait_tx_complete ; Wait for transmit interrupt

22.2.2 I

C Example 2: Master Mode Receive

; I2C configured as master, receive from slave address 08h:

; Setup for Master Mode Receive

move I2CCN, #047h ; I2CEN = 1, I2CMST = 1, I2CMODE = 1, I2CSTART = 1

call wait_start ; Polling routine to wait for I2CSTART to clear

call wait_busy ; Polling routine to wait for I2CBUSY to clear

move I2CIE.2, #01h ; Enable Receive Ready Interrupt

move I2CBUF, #008h ; Slave address set to 08h

call wait_tx_complete ; Wait for transmit interrupt

call wait_rxbuf ; Wait for receive interrupt

;; Byte received in I2CBUF, clear I2C interrupt flag and wait for next interrupt

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Maxim-integrated MAXQ Family Users Guide: MAXQ2010 Supplement Manual do Utilizador Página 130