Application Note. nrf24l01 Software Driver for C51 Microcontrollers. Software Driver for C51 Microcontrollers. References.
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1 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. AT89C5131A is a high-performance Flash version of the 80C51 single-chip 8-bit micro controllers with full speed USB functions. This application note describes the nrf24l01 software driver running on AT89C5131A micrcontroller. Software Driver for C51 Microcontrollers Application Note References AT89C5131A data sheet (available on nrf24l01 data sheet (available on Acronyms USB: Universal Serial Bus ISM: Industrial, Scientific and Medical (radio spectrum)
2 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: This part contains files from Nordic evaluation kit (source code available on 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 2 nrf24l01 Software Driver
3 nrf24l01 Software Driver Hardware Description This driver is based on the hardware configuration described in Fig 1. Figure 1. AT89C5131A and nrf24l01 AT89C5131A nrf24l01 SPI P1_6/SCK P1_7/MOSI P1_5/MISO SCK MOSI MISO CSN P2_1 P2_2 CE P3_2/INT0 IRQ XTAL1 XTAL2 XC1 XC2 16MHz 16MHz Note: 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
4 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 4 nrf24l01 Software Driver
5 nrf24l01 Software Driver Application layer The application calls open, putc and getc functions. Table 1. Application functions Application function open() putc() getc() Description Init device Send a data byte on RF part 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 Description SPI_Init SPI Mode (hardware) Init C5131 hardware SPI C5131_enable_it nrf24l01_reset nrf24l01_tx_config nrf24l01_rx_config Enable C5131 IT on INT0 pin Reset/Unreset nrf24l01 Configure nrf24l01 in Tx mode 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
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