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31 ******************************************************************************/
32 /****************************************************************************/
36 * @addtogroup uartps_v2_1
41 * MODIFICATION HISTORY:
43 * Ver Who Date Changes
44 * ----- ------ -------- ----------------------------------------------
45 * 1.00 drg/jz 01/12/10 First Release
46 * 1.05a hk 08/22/13 Added reset function
49 *****************************************************************************/
51 /***************************** Include Files ********************************/
52 #include "xuartps_hw.h"
54 /************************** Constant Definitions ****************************/
57 /***************** Macros (Inline Functions) Definitions ********************/
60 /************************** Function Prototypes ******************************/
63 /************************** Variable Definitions *****************************/
65 /****************************************************************************/
68 * This function sends one byte using the device. This function operates in
69 * polled mode and blocks until the data has been put into the TX FIFO register.
71 * @param BaseAddress contains the base address of the device.
72 * @param Data contains the byte to be sent.
78 *****************************************************************************/
79 void XUartPs_SendByte(u32 BaseAddress, u8 Data)
82 * Wait until there is space in TX FIFO
84 while (XUartPs_IsTransmitFull(BaseAddress));
87 * Write the byte into the TX FIFO
89 XUartPs_WriteReg(BaseAddress, XUARTPS_FIFO_OFFSET, Data);
92 /****************************************************************************/
95 * This function receives a byte from the device. It operates in polled mode
96 * and blocks until a byte has received.
98 * @param BaseAddress contains the base address of the device.
100 * @return The data byte received.
104 *****************************************************************************/
105 u8 XUartPs_RecvByte(u32 BaseAddress)
108 * Wait until there is data
110 while (!XUartPs_IsReceiveData(BaseAddress));
113 * Return the byte received
115 return (XUartPs_ReadReg(BaseAddress, XUARTPS_FIFO_OFFSET));
118 /****************************************************************************/
121 * This function resets UART
123 * @param BaseAddress contains the base address of the device.
129 *****************************************************************************/
130 void XUartPs_ResetHw(u32 BaseAddress)
136 XUartPs_WriteReg(BaseAddress, XUARTPS_IDR_OFFSET, XUARTPS_IXR_MASK);
139 * Disable receive and transmit
141 XUartPs_WriteReg(BaseAddress, XUARTPS_CR_OFFSET,
142 XUARTPS_CR_RX_DIS | XUARTPS_CR_TX_DIS);
145 * Software reset of receive and transmit
146 * This clears the FIFO.
148 XUartPs_WriteReg(BaseAddress, XUARTPS_CR_OFFSET,
149 XUARTPS_CR_TXRST | XUARTPS_CR_RXRST);
152 * Clear status flags - SW reset wont clear sticky flags.
154 XUartPs_WriteReg(BaseAddress, XUARTPS_ISR_OFFSET, XUARTPS_IXR_MASK);
157 * Mode register reset value : All zeroes
158 * Normal mode, even parity, 1 stop bit
160 XUartPs_WriteReg(BaseAddress, XUARTPS_MR_OFFSET,
161 XUARTPS_MR_CHMODE_NORM);
164 * Rx and TX trigger register reset values
166 XUartPs_WriteReg(BaseAddress, XUARTPS_RXWM_OFFSET,
167 XUARTPS_RXWM_RESET_VAL);
168 XUartPs_WriteReg(BaseAddress, XUARTPS_TXWM_OFFSET,
169 XUARTPS_TXWM_RESET_VAL);
172 * Rx timeout disabled by default
174 XUartPs_WriteReg(BaseAddress, XUARTPS_RXTOUT_OFFSET,
175 XUARTPS_RXTOUT_DISABLE);
178 * Baud rate generator and dividor reset values
180 XUartPs_WriteReg(BaseAddress, XUARTPS_BAUDGEN_OFFSET,
181 XUARTPS_BAUDGEN_RESET_VAL);
182 XUartPs_WriteReg(BaseAddress, XUARTPS_BAUDDIV_OFFSET,
183 XUARTPS_BAUDDIV_RESET_VAL);
186 * Control register reset value -
187 * RX and TX are disable by default
189 XUartPs_WriteReg(BaseAddress, XUARTPS_CR_OFFSET,
190 XUARTPS_CR_RX_DIS | XUARTPS_CR_TX_DIS |