View detail for nRF24L01 Software Driver for C51 Microcontrollers

nRF24L01 Software Driver for C51
Microcontrollers
nRF24L01 is a single chip RF-transceiver intended for applications in the 2.4 GHz ISM
to 2.5 GHz band.
Software Driver
for C51
Microcontrollers
AT89C5131A is a high-performance Flash version of the 80C51 single-chip 8-bit micro
controllers with full speed USB functions.
Application Note
Th is app lica tion no te d escrib es th e nRF24L 01 softwa re drive r ru nning on
AT89C5131A micrcontroller.
References
AT89C5131A data sheet (available on www.atmel.com)
nRF24L01 data sheet (available on www.nordicsemi.no)
Acronyms
USB:
Universal Serial Bus
ISM:
Industrial, Scientific and Medical (radio spectrum)
7651A–USB–05/06
Software Driver Overview
The nRF24L01/AT89C5131A driver is composed of 3 parts:
1/ nRF24L01 driver:
This part contains the functions to init the nRF24L01 in transmission mode or reception mode.
This part contains also the interrupt function.
The list of files is:
• nRF24L01_lib.c
• nRF24L01_lib.h
2/ Nordic driver:
T his part contains fi les from Nordic evaluation kit (source code available on
www.nordicsemi.no).
The list of files is:
• Protocol_API.c
• Protocol_API.h
• nRF_API.c
• nRF_API.h
3/ Low level driver:
This part contains files with low level functions to control AT89C5131A IOs and SPI commands.
The low level driver calls SPI functions from a C51 library.
The list of files is:
• LL_API_C51.c
• LL_API_C51.h
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nRF24L01 Software Driver
7651A–USB–05/06
nRF24L01 Software Driver
Hardware Description
This driver is based on the hardware configuration described in Fig 1.
Figure 1. AT89C5131A and nRF24L01
nRF24L01
AT89C5131A
SPI
P1_6/SCK
SCK
P1_7/MOSI
MOSI
P1_5/MISO
MISO
CSN
P2_1
P2_2
P3_2/INT0
XTAL1
XTAL2
CE
IRQ
XC1
16MHz
Note:
XC2
16MHz
Both ICs can share the same crystal if they are placed on the same PCB.
The nRF24L01 signals are separated in two parts:
•
SPI: the read/write operations on nRF24L01 registers come from the AT89C5131A
hardware SPI bus (ENABLE, CLOCK, DATA).
•
IO lines: the control of CE and CSN signals is done by 2 IO lines. The IRQ signal from
nRF24L01 is connected to the external interrupt input (INT0) of the AT89C5131A.
3
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nRF24L01 Software Driver Description
A list of functions (based on SPI commands) is proposed to:
• send the configuration to nRF24L01
• send/receive data on RF part of nRF24L01.
Figure 2. Software Architecture
Application
nRF24L01 driver
nRF24L01_lib.c
Nordic driver
Protocol_API.c
nRF_API.c
* provided by Nordic
Low level driver
LL_API.c
* specific for AT89C5131A
SPI driver
SPI_drv.c
nRF24L01 device
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nRF24L01 Software Driver
7651A–USB–05/06
nRF24L01 Software Driver
Application layer
The application calls “open”, “putc” and “getc” functions.
Table 1. Application functions
Application function
Description
open()
Init device
putc()
Send a data byte on RF part
getc()
Receive a data byte on RF part
nRF24L01 driver
The nRF24L01 driver contains functions to send/receive data via RF. The nRF24L01 driver
calls Nordic functions from Protocol_API and nRF_API files.
Table 2. Application functions
Application function
nRF24L01 function
Description
open()
nRF24L01_init()
UART init and nRF24L01 init
putc()
nRF24L01_send_byte()
Send a data byte on RF part
getc()
nRF24L01_receive_byte()
Receive a data byte on RF part
Low Level layer
The nRF24L01 driver manages the configuration of nRF24L01 by using the hardware SPI bus of
AT89C5131A.
Table 3. nRF24L01 low level functions
Function name
Parameters
SPI_Init
SPI Mode (hardware)
Description
Init C5131 hardware SPI
C5131_enable_it
Enable C5131 IT on INT0 pin
nRF24L01_reset
Reset/Unreset nRF24L01
nRF24L01_tx_config
Configure nRF24L01 in Tx mode
nRF24L01_rx_config
Configure nRF24L01 in Rx mode
SPI_HW
Data to send
Send a byte via RF
CSN_Pin
State (0 or 1)
Control of CSN pin of nRF24L01
CE_Pin
state (O or 1)
Control of CE pin of nRF24L01
5
7651A–USB–05/06
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7651A–USB–05/06