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40 *****************************************************************************/
41 /****************************************************************************/
48 * MODIFICATION HISTORY:
50 * Ver Who Date Changes
51 * ----- ------ -------- ----------------------------------------------
52 * 1.00 drg/jz 01/12/10 First Release
53 * 1.05a hk 08/22/13 Added reset function
56 *****************************************************************************/
58 /***************************** Include Files ********************************/
59 #include "xuartps_hw.h"
61 /************************** Constant Definitions ****************************/
64 /***************** Macros (Inline Functions) Definitions ********************/
67 /************************** Function Prototypes ******************************/
70 /************************** Variable Definitions *****************************/
72 /****************************************************************************/
75 * This function sends one byte using the device. This function operates in
76 * polled mode and blocks until the data has been put into the TX FIFO register.
78 * @param BaseAddress contains the base address of the device.
79 * @param Data contains the byte to be sent.
85 *****************************************************************************/
86 void XUartPs_SendByte(u32 BaseAddress, u8 Data)
89 * Wait until there is space in TX FIFO
91 while (XUartPs_IsTransmitFull(BaseAddress));
94 * Write the byte into the TX FIFO
96 XUartPs_WriteReg(BaseAddress, XUARTPS_FIFO_OFFSET, Data);
99 /****************************************************************************/
102 * This function receives a byte from the device. It operates in polled mode
103 * and blocks until a byte has received.
105 * @param BaseAddress contains the base address of the device.
107 * @return The data byte received.
111 *****************************************************************************/
112 u8 XUartPs_RecvByte(u32 BaseAddress)
115 * Wait until there is data
117 while (!XUartPs_IsReceiveData(BaseAddress));
120 * Return the byte received
122 return (XUartPs_ReadReg(BaseAddress, XUARTPS_FIFO_OFFSET));
125 /****************************************************************************/
128 * This function resets UART
130 * @param BaseAddress contains the base address of the device.
136 *****************************************************************************/
137 void XUartPs_ResetHw(u32 BaseAddress)
143 XUartPs_WriteReg(BaseAddress, XUARTPS_IDR_OFFSET, XUARTPS_IXR_MASK);
146 * Disable receive and transmit
148 XUartPs_WriteReg(BaseAddress, XUARTPS_CR_OFFSET,
149 XUARTPS_CR_RX_DIS | XUARTPS_CR_TX_DIS);
152 * Software reset of receive and transmit
153 * This clears the FIFO.
155 XUartPs_WriteReg(BaseAddress, XUARTPS_CR_OFFSET,
156 XUARTPS_CR_TXRST | XUARTPS_CR_RXRST);
159 * Clear status flags - SW reset wont clear sticky flags.
161 XUartPs_WriteReg(BaseAddress, XUARTPS_ISR_OFFSET, XUARTPS_IXR_MASK);
164 * Mode register reset value : All zeroes
165 * Normal mode, even parity, 1 stop bit
167 XUartPs_WriteReg(BaseAddress, XUARTPS_MR_OFFSET,
168 XUARTPS_MR_CHMODE_NORM);
171 * Rx and TX trigger register reset values
173 XUartPs_WriteReg(BaseAddress, XUARTPS_RXWM_OFFSET,
174 XUARTPS_RXWM_RESET_VAL);
175 XUartPs_WriteReg(BaseAddress, XUARTPS_TXWM_OFFSET,
176 XUARTPS_TXWM_RESET_VAL);
179 * Rx timeout disabled by default
181 XUartPs_WriteReg(BaseAddress, XUARTPS_RXTOUT_OFFSET,
182 XUARTPS_RXTOUT_DISABLE);
185 * Baud rate generator and dividor reset values
187 XUartPs_WriteReg(BaseAddress, XUARTPS_BAUDGEN_OFFSET,
188 XUARTPS_BAUDGEN_RESET_VAL);
189 XUartPs_WriteReg(BaseAddress, XUARTPS_BAUDDIV_OFFSET,
190 XUARTPS_BAUDDIV_RESET_VAL);
193 * Control register reset value -
194 * RX and TX are disable by default
196 XUartPs_WriteReg(BaseAddress, XUARTPS_CR_OFFSET,
197 XUARTPS_CR_RX_DIS | XUARTPS_CR_TX_DIS |