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Case download:
uart_apb.zip

1 Design Brief

UART is short for Universal Asynchronous Receiver and Transmitter. Used for communication between serial input and serial output devices. Serial transmission comes at the cost of speed, in exchange for a reduction in cost and complexity of wiring. UART provides synchronization of serial asynchronous received data, parallel-to-serial and serial-to-parallel data conversion of the transmitter and receiver, for digital systems that need to convert serial data streams to parallel data, these functions Is essential. Synchronization of the serial data stream is achieved by adding start and stop bits to the transmitted data to form a data character. Data integrity is achieved by appending a parity bit to the data character, which is provided by the receiver Check this parity bit to check whether there is any transmission bit error. It is mainly composed of data bus interface, control logic, baud rate generator, sending part and receiving part.

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The UART controller IP core design is the AMBA APB slave bus interface, and our FBIO Wrapper is the AMBA AXI bus interface, which cannot be directly connected together, and requires an AXI2ABP Bridge to connect;

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, We choose apb_ bus_ m32_bridge module from Bus Bridge series, it provides APB master bus interface to connect our IP,as shown in the figure below;

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This experiment uses the FPGA daughter board supporting the Plus1 7021 SP7021 SOC practice platform to complete the relevant experiment. The experiment is carried out in loopback mode, which is to connect the TX and RX of the UART controller IP core design; The development tool of FPGA daughter board uses XILINX's Vivado integrated development environment (version number is 2018.3); in order to facilitate the connection of the user's own verification IP to the SOC system for verification, this experiment provides the corresponding design reference basic files, as followsImage Removed

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The corresponding connection between the design case and the pin connection of the SP7021 motherboard and FPGA daughter board is shown in the following table: 1: U20B on the main board is connected to J2 of the FPGA daughter board (Pin pin corresponding, such as 1-51 ...), providing the data transmission channel between the Plus1 main chip on the main board and the FPGA Image Removed

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Design Demo	FPGA daughter board			SP7021 mother board
uart_apb	J2		U1E	U20B
Top Port Name	Schematic Name		FPGA I/O	Schematic Name
	1	GND		51	GND
	2	GND		52	GND
FPGA_PAD[0]	3	B34_L24_N	T8	53	FBIO_PAD_0
FPGA_PAD[43]	4	B34_L24_P	R8	54	FBIO_PAD_1
	5	VIN		55	VCC(3.3V)
	6	VCCIO34		56	VCC(3.3V)
FPGA_PAD[1]	7	B34_L21_N	V9	57	FBIO_PAD_2
FPGA_PAD[42]	8	B34_L21_P	U9	58	FBIO_PAD_3
FPGA_PAD[2]	9	B34_L18_N	N6	59	FBIO_PAD_4
FPGA_PAD[41]	10	B34_L18_P	M6	60	FBIO_PAD_5
FPGA_PAD[3]	11	B34_L22_N	U6	61	FBIO_PAD_6
FPGA_PAD[40]	12	B34_L22_P	U7	62	FBIO_PAD_7
FPGA_PAD[4]	13	B34_L20_N	V6	63	FBIO_PAD_8
FPGA_PAD[39]	14	B34_L20_P	V7	64	FBIO_PAD_9
FPGA_PAD[5]	15	B34_L23_N	T6	65	FBIO_PAD_10
FPGA_PAD[38]	16	B34_L23_P	R7	66	FBIO_PAD_11
FPGA_PAD[6]	17	B34_L10_N	V4	67	FBIO_PAD_12
FPGA_PAD[37]	18	B34_L10_P	V5	68	FBIO_PAD_13
FPGA_PAD[7]	19	B34_L19_P	R6	69	FBIO_PAD_14
FPGA_PAD[36]	20	B34_L19_N	R5	70	FBIO_PAD_15
FPGA_PAD[8]	21	B34_L8_P	U4	71	FBIO_PAD_16
FPGA_PAD[35]	22	B34_L8_N	U3	72	FBIO_TCLK
FPGA_PAD[9]	23	B34_L9_N	V2	73	FBIO_RCLK
FPGA_PAD[34]	24	B34_L9_P	U2	74	FBIO_PAD_17
FPGA_PAD[10]	25	B34_L7_N	V1	75	FBIO_PAD_18
FPGA_PAD[33]	26	B34_L7_P	U1	76	FBIO_PAD_19
FPGA_PAD[11]	27	B34_L13_P	N5	77	FBIO_PAD_20
FPGA_PAD[32]	28	B34_L13_N	P5	78	FBIO_PAD_21
FPGA_PAD[12]	29	B34_L12_P	T5	79	FBIO_PAD_22
FPGA_PAD[31]	30	B34_L12_N	T4	80	FBIO_PAD_23
FPGA_PAD[13]	31	B34_L11_N	T3	81	FBIO_PAD_24
FPGA_PAD[30]	32	B34_L11_P	R3	82	FBIO_PAD_25
FPGA_PAD[29]	33	B34_L14_P	P4	83	FBIO_PAD_26
FPGA_PAD[28]	34	B34_L14_N	P3	84	FBIO_PAD_27
FPGA_PAD[14]	35	B34_L16_N	N4	85	FBIO_PAD_28
FPGA_PAD[27]	36	B34_L16_P	M4	86	FBIO_PAD_29
FPGA_PAD[15]	37	B34_L17_N	T1	87	FBIO_PAD_30
FPGA_PAD[26]	38	B34_L17_P	R1	88	FBIO_PAD_31
FPGA_PAD[16]	39	B34_L15_N	R2	89	FBIO_PAD_32
FPGA_PAD[25]	40	B34_L15_P	P2	90	FBIO_PAD_33
FPGA_PAD[17]	41	B34_L3_N	N1	91	FBIO_PAD_34
FPGA_PAD[24]	42	B34_L3_P	N2	92	FBIO_PAD_35
FPGA_PAD[18]	43	B34_L1_N	M1	93	FBIO_PAD_RSTB
FPGA_PAD[23]	44	B34_L1_P	L1	94	EXT0_INT
	45	VCCIO34		95	VCC(3.3V)
	46	VIN		96	VCC(3.3V)
FPGA_PAD[19]	47	B34_L4_P	M3	97	EXT1_INT
FPGA_PAD[20]	48	B34_L4_N	M2	98
	49	GND		99	GND
	50	GND		100	GND

2: U20A on the motherboard is connected to J1 of the FPGA daughter board (Pin pins correspond to one, such as 1-1 ...), and the 42 pin IO (3.3v) of FPGA Bank 35 is extended via J17 for users to use

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Design Demo	FPGA daughter board			SP7021 mother board
uart_apb	J1		U1F	U20A		J17
Top Port Name	Schematic Name		FPGA I/O	Schematic Name		Schematic Name
	1	GND		1	GND	3	GND
	2	GND		2	GND	4	GND
FPGA_TX	3	B35_L23_N	K1	3	B35_L23_N	5	B35_L23_N
	4	B35_L23_P	K2	4	B35_L23_P	6	B35_L23_P
	5	VIN		5	VIN	1	VCC
	6	VCCIO35		6	VCCIO35	2	VCC
FPGA_RX	7	B35_L15_N	G2	7	B35_L15_N	7	B35_L15_N
	8	B35_L15_P	H2	8	B35_L15_P	8	B35_L15_P
	9	B35_L13_N	F3	9	B35_L13_N	9	B35_L13_N
	10	B35_L13_P	F4	10	B35_L13_P	10	B35_L13_P
	11	B35_L12_N	D3	11	B35_L12_N	11	B35_L12_N
	12	B35_L12_P	E3	12	B35_L12_P	12	B35_L12_P
	13	B35_L22_P	J3	13	B35_L22_P	13	B35_L22_P
	14	B35_L22_N	J2	14	B35_L22_N	14	B35_L22_N
	15	B35_L17_N	G1	15	B35_L17_N	15	B35_L17_N
	16	B35_L17_P	H1	16	B35_L17_P	16	B35_L17_P
	17	B35_L18_N	E1	17	B35_L18_N	17	B35_L18_N
	18	B35_L18_P	F1	18	B35_L18_P	18	B35_L18_P
	19	B35_L14_N	D2	19	B35_L14_N	19	B35_L14_N
	20	B35_L14_P	E2	20	B35_L14_P	20	B35_L14_P
	21	B35_L16_P	C2	21	B35_L16_P	21	B35_L16_P
	22	B35_L16_N	C1	22	B35_L16_N	22	B35_L16_N
	23	B35_L9_N	A1	23	B35_L9_N	23	B35_L9_N
	24	B35_L9_P	B1	24	B35_L9_P	24	B35_L9_P
	25	B35_L10_P	B3	25	B35_L10_P	25	B35_L10_P
	26	B35_L10_N	B2	26	B35_L10_N	26	B35_L10_N
	27	B35_L8_N	A3	27	B35_L8_N	27	B35_L8_N
	28	B35_L8_P	A4	28	B35_L8_P	28	B35_L8_P
	29	B35_L11_N	D4	29	B35_L11_N	29	B35_L11_N
	30	B35_L11_P	D5	30	B35_L11_P	30	B35_L11_P
	31	B35_L3_N	A5	31	B35_L3_N	31	B35_L3_N
	32	B35_L3_P	A6	32	B35_L3_P	32	B35_L3_P
	33	B35_L2_N	B6	33	B35_L2_N	33	B35_L2_N
	34	B35_L2_P	B7	34	B35_L2_P	34	B35_L2_P
	35	B35_L7_N	B4	35	B35_L7_N	35	B35_L7_N
	36	B35_L7_P	C4	36	B35_L7_P	36	B35_L7_P
	37	B35_L1_N	C5	37	B35_L1_N	37	B35_L1_N
	38	B35_L1_P	C6	38	B35_L1_P	38	B35_L1_P
	39	B35_L5_N	E5	39	B35_L5_N	39	B35_L5_N
	40	B35_L5_P	E6	40	B35_L5_P	40	B35_L5_P
	41	B35_L6_N	D7	41	B35_L6_N	41	B35_L6_N
	42	B35_L6_P	E7	42	B35_L6_P	42	B35_L6_P
	43	B35_L19_P	G6	43	B35_L19_P	43	B35_L19_P
	44	B35_L19_N	F6	44	B35_L19_N	44	B35_L19_N
	45	VCCIO35		45	VCCIO35	49	VCC
	46	VIN		46	VIN	50	VCC
	47	B35_L4_N	C7	47	B35_L4_N	45	B35_L4_N
	48	B35_L4_P	D8	48	B35_L4_P	46	B35_L4_P
	49	GND		49	GND	47	GND
	50	GND		50	GND	48	GND

6.2Implementation of System Software Platform for UART Controller IP Design Experiment Project

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Next, you need to copy all the files and folders under the installation directory \SP7021\example\uart_apb to the uart_apb project directory built above (the path is: installation directory \SP7021\workspace\uart_apb\), the file with the same name is selected to be overwritten, so that the UART The program codes main.c; uart.c; uart.h required for the IP design practice of the controller are placed in the following paths:

1） Install main.c in In the install directory \SP7021\workspace\uart_apb\main.c

2） Install uart.c in In the install directory \SP7021\workspace\uart_apb\testapi\util\uart.c

3） Install uart.h in the In the install directory \SP7021\workspace\uart_apb\include\util folder\uart.h

Finally, as shown in the figure below, the mouse selects the red box 1, then clicks the right mouse button to appear the drop-down menu, and then selects the red box 2, refresh the copy action just now, so that the file just copied can be displayed in the IDE environment

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Defined UART control IP related registers

6.3 Run Program code

After compile in the Plus1 IDE environment, download to the platform and see the following information in the terminal window

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Key

1 Design Brief

6.2Implementation of System Software Platform for UART Controller IP Design Experiment Project