1 /******************************************************************************
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17 * (b) that interact with a Xilinx device through a bus or interconnect.
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31 ******************************************************************************/
32 /****************************************************************************/
39 * MODIFICATION HISTORY:
41 * Ver Who Date Changes
42 * ----- ------ -------- ----------------------------------------------
43 * 1.00 drg/jz 01/12/10 First Release
44 * 1.05a hk 08/22/13 Added reset function
45 * 3.00 kvn 02/13/15 Modified code for MISRA-C:2012 compliance.
48 *****************************************************************************/
50 /***************************** Include Files ********************************/
51 #include "xuartps_hw.h"
53 /************************** Constant Definitions ****************************/
56 /***************** Macros (Inline Functions) Definitions ********************/
59 /************************** Function Prototypes ******************************/
62 /************************** Variable Definitions *****************************/
64 /****************************************************************************/
67 * This function sends one byte using the device. This function operates in
68 * polled mode and blocks until the data has been put into the TX FIFO register.
70 * @param BaseAddress contains the base address of the device.
71 * @param Data contains the byte to be sent.
77 *****************************************************************************/
78 void XUartPs_SendByte(u32 BaseAddress, u8 Data)
81 * Wait until there is space in TX FIFO
83 while (XUartPs_IsTransmitFull(BaseAddress)) {
88 * Write the byte into the TX FIFO
90 XUartPs_WriteReg(BaseAddress, XUARTPS_FIFO_OFFSET, (u32)Data);
93 /****************************************************************************/
96 * This function receives a byte from the device. It operates in polled mode
97 * and blocks until a byte has received.
99 * @param BaseAddress contains the base address of the device.
101 * @return The data byte received.
105 *****************************************************************************/
106 u8 XUartPs_RecvByte(u32 BaseAddress)
110 * Wait until there is data
112 while (!XUartPs_IsReceiveData(BaseAddress)) {
115 RecievedByte = XUartPs_ReadReg(BaseAddress, XUARTPS_FIFO_OFFSET);
117 * Return the byte received
119 return (u8)RecievedByte;
122 /****************************************************************************/
125 * This function resets UART
127 * @param BaseAddress contains the base address of the device.
133 *****************************************************************************/
134 void XUartPs_ResetHw(u32 BaseAddress)
140 XUartPs_WriteReg(BaseAddress, XUARTPS_IDR_OFFSET, XUARTPS_IXR_MASK);
143 * Disable receive and transmit
145 XUartPs_WriteReg(BaseAddress, XUARTPS_CR_OFFSET,
146 ((u32)XUARTPS_CR_RX_DIS | (u32)XUARTPS_CR_TX_DIS));
149 * Software reset of receive and transmit
150 * This clears the FIFO.
152 XUartPs_WriteReg(BaseAddress, XUARTPS_CR_OFFSET,
153 ((u32)XUARTPS_CR_TXRST | (u32)XUARTPS_CR_RXRST));
156 * Clear status flags - SW reset wont clear sticky flags.
158 XUartPs_WriteReg(BaseAddress, XUARTPS_ISR_OFFSET, XUARTPS_IXR_MASK);
161 * Mode register reset value : All zeroes
162 * Normal mode, even parity, 1 stop bit
164 XUartPs_WriteReg(BaseAddress, XUARTPS_MR_OFFSET,
165 XUARTPS_MR_CHMODE_NORM);
168 * Rx and TX trigger register reset values
170 XUartPs_WriteReg(BaseAddress, XUARTPS_RXWM_OFFSET,
171 XUARTPS_RXWM_RESET_VAL);
172 XUartPs_WriteReg(BaseAddress, XUARTPS_TXWM_OFFSET,
173 XUARTPS_TXWM_RESET_VAL);
176 * Rx timeout disabled by default
178 XUartPs_WriteReg(BaseAddress, XUARTPS_RXTOUT_OFFSET,
179 XUARTPS_RXTOUT_DISABLE);
182 * Baud rate generator and dividor reset values
184 XUartPs_WriteReg(BaseAddress, XUARTPS_BAUDGEN_OFFSET,
185 XUARTPS_BAUDGEN_RESET_VAL);
186 XUartPs_WriteReg(BaseAddress, XUARTPS_BAUDDIV_OFFSET,
187 XUARTPS_BAUDDIV_RESET_VAL);
190 * Control register reset value -
191 * RX and TX are disable by default
193 XUartPs_WriteReg(BaseAddress, XUARTPS_CR_OFFSET,
194 ((u32)XUARTPS_CR_RX_DIS | (u32)XUARTPS_CR_TX_DIS |
195 (u32)XUARTPS_CR_STOPBRK));