正点原子H7R7开发板上面的NRF24L01接口是可以接一个NRF24L01模块的,原子论坛也提供了例程可供参考,但是是适配给原子自家的NRF24L01模块的,使用第三方模块厂出品的NRF24L01模块程序需要做一些细微调整,无法直接通用。
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( }+ V# c( M2 n0 G9 h7 a首先是初始化SPI接口,这个非常简单:+ R) y5 n: ~% I4 y4 V
- SPI_HandleTypeDef g_spi_handle;
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1 V+ |4 g Z9 c" @4 M- uint8_t SPI2_PD3_PC2_PC3_Read_Write_Byte(uint8_t txdata)+ @1 F$ b& j) u7 [% Y# d2 L
- {
: p3 f/ Y9 R1 j8 a$ r b4 x F - uint8_t rxdata;
. V8 {+ H7 z4 U; d) f" V - HAL_SPI_TransmitReceive(&g_spi_handle , &txdata , &rxdata , 1 , 1000);3 Z+ z: W) z: f, y
- return rxdata;
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# G3 a! p) `* a% c$ X- void SPI2_PD3_PC2_PC3_Init(void)0 b ]( ?) ~) _: J! X2 g; U
- {
" ~% e! O0 K( e* Z3 Y - GPIO_InitTypeDef gpio_init_struct = {0};+ |4 ~6 e/ \9 K k) L8 B M
- RCC_PeriphCLKInitTypeDef rcc_periph_clk_init = {0};
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# _9 O* U3 F1 f! N* X. ~/ \- __HAL_RCC_SPI2_CLK_ENABLE();: H7 o) b, S" z% U1 r+ U
- __HAL_RCC_GPIOC_CLK_ENABLE();' j- I S: H- t' N1 t4 M G
- __HAL_RCC_GPIOD_CLK_ENABLE();1 L @! y% o& r+ b/ i
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* S5 o( o6 S. z" a; \ - rcc_periph_clk_init.PeriphClockSelection = RCC_PERIPHCLK_SPI23;+ S+ [3 W5 Q. ` W% L! B% D K
- rcc_periph_clk_init.Spi23ClockSelection = RCC_SPI23CLKSOURCE_PLL1Q;
8 F+ @/ g- I1 f9 ^- F8 ^0 |3 h - HAL_RCCEx_PeriphCLKConfig(&rcc_periph_clk_init);
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- gpio_init_struct.Mode = GPIO_MODE_AF_PP;
% D6 ]( c& c7 _ - gpio_init_struct.Pull = GPIO_PULLUP;$ R+ I: d) ?7 f7 D! C7 ~
- gpio_init_struct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
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- gpio_init_struct.Pin = GPIO_PIN_3;" H3 k( ?# Y9 i1 M: O5 Z1 J6 _
- gpio_init_struct.Alternate = GPIO_AF5_SPI2;+ k! G8 s# Y3 z! J- w
- HAL_GPIO_Init(GPIOD , &gpio_init_struct);5 e: u. t$ s' p L" `1 k" Q
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- gpio_init_struct.Pin = GPIO_PIN_2;
5 i+ p: g3 X0 J0 `8 A - gpio_init_struct.Alternate = GPIO_AF5_SPI2;
: q$ t8 }) M9 B: K; _8 R - HAL_GPIO_Init(GPIOC , &gpio_init_struct);
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+ a, j* @* P0 ~9 N - gpio_init_struct.Pin = GPIO_PIN_3;
! R4 R+ i L* f% y - gpio_init_struct.Alternate = GPIO_AF5_SPI2;
o- W2 f. u; u4 t1 U - HAL_GPIO_Init(GPIOC , &gpio_init_struct);
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* o4 T# q/ Q0 \( m; `0 c- g_spi_handle.Instance = SPI2;
& r- R$ {8 ]% [9 J/ G - g_spi_handle.Init.Mode = SPI_MODE_MASTER;1 {/ E" b: b. u5 G4 R7 h2 I8 E
- g_spi_handle.Init.Direction = SPI_DIRECTION_2LINES;) S W7 ^; ^) x; ]# s0 t: Y( @
- g_spi_handle.Init.DataSize = SPI_DATASIZE_8BIT;7 |* W( V6 `* V4 m0 x- C
- g_spi_handle.Init.CLKPolarity = SPI_POLARITY_LOW;# u- j0 ~. h& V
- g_spi_handle.Init.CLKPhase = SPI_PHASE_1EDGE;7 X& N1 ?; j, L' f
- g_spi_handle.Init.NSS = SPI_NSS_SOFT;
( {% D) x' @# c# N1 y - g_spi_handle.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
+ e; L1 z2 f6 q5 f) f d& _ - g_spi_handle.Init.MasterKeepIOState = SPI_MASTER_KEEP_IO_STATE_ENABLE;5 Q* @9 S- O4 m+ F0 L: z
- g_spi_handle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_128;& a" L2 l( I6 m/ n" N$ q$ p
- g_spi_handle.Init.FirstBit = SPI_FIRSTBIT_MSB;$ [6 o6 F5 p/ @ r$ I+ C
- g_spi_handle.Init.TIMode = SPI_TIMODE_DISABLE;
7 X- H; L+ `- a$ H - g_spi_handle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;: e$ \0 J! Y( T' X( M( k
- g_spi_handle.Init.CRCPolynomial = 7;4 l; t) i. x/ b9 D, y
- HAL_SPI_Init(&g_spi_handle);
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; j4 }- \3 R1 @9 R; h; d: W' a- __HAL_SPI_ENABLE(&g_spi_handle);. l( e& p$ a1 h+ @% [$ {
- SPI2_PD3_PC2_PC3_Read_Write_Byte(0Xff);
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复制代码 这里需要注意的是,H7R7的SPI接口时钟要设置为128分频或者256分频,因为SPI123三个接口的时钟直接挂在PLLQ上,分频太少的话,波形变形的程度使得NRF24L01无法识别,进而无法进行任何通信,然后就是时钟信号空闲时为低,第一个沿变开始传输数据,这个也是NRF24L01芯片的特性,不遵循这个设置无法进行通信。6 t% u, _$ {$ r1 f, B8 O3 G9 e' S
* M0 J) Y& m( T1 K9 t" ~- L2 Z: m7 jNRF24L01还需要用CS CE IRQ三个脚,其中CS脚是片选,需要在传输数据时进行控制,CE脚常高表示使能,IRQ脚是发送时会用到: e! u/ U n* n
- #define NRF24L01_CS_GPIO_PORT GPIOM: U5 x! |) y O/ S* A L( L$ y
- #define NRF24L01_CS_GPIO_PIN GPIO_PIN_13
9 s- o& k. L* @5 P) m, W - #define NRF24L01_CS_GPIO_CLK_ENABLE __HAL_RCC_GPIOM_CLK_ENABLE();
+ r4 s# x u8 H* K - #define NRF24L01_CS_HIGH HAL_GPIO_WritePin(NRF24L01_CS_GPIO_PORT , NRF24L01_CS_GPIO_PIN , GPIO_PIN_SET);! ^/ Q- ] ]! z( W+ H4 \
- #define NRF24L01_CS_LOW HAL_GPIO_WritePin(NRF24L01_CS_GPIO_PORT , NRF24L01_CS_GPIO_PIN , GPIO_PIN_RESET); h6 ]* |, t) r+ @. y) L% n* x8 ]
3 h+ d$ k) T( z: d$ S) m2 [- #define NRF24L01_CE_GPIO_PORT GPIOM) _3 P6 E, S# N( X
- #define NRF24L01_CE_GPIO_PIN GPIO_PIN_14
# K6 \* O8 T& D/ Y - #define NRF24L01_CE_GPIO_CLK_ENABLE __HAL_RCC_GPIOM_CLK_ENABLE();( g$ K/ l- }: t
- #define NRF24L01_CE_HIGH HAL_GPIO_WritePin(NRF24L01_CE_GPIO_PORT , NRF24L01_CE_GPIO_PIN , GPIO_PIN_SET);
+ K5 x/ E4 S; W( l1 `' D - #define NRF24L01_CE_LOW HAL_GPIO_WritePin(NRF24L01_CE_GPIO_PORT , NRF24L01_CE_GPIO_PIN , GPIO_PIN_RESET);8 t* t7 s! C- y j: ?
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- #define NRF24L01_IRQ_GPIO_PORT GPIOF
6 b: d- c% o/ X& _ - #define NRF24L01_IRQ_GPIO_PIN GPIO_PIN_2
6 i- d0 d: D1 B# T" O - #define NRF24L01_IRQ_GPIO_CLK_ENABLE __HAL_RCC_GPIOF_CLK_ENABLE();
2 G6 L( V7 ?1 \7 E( y3 x: { - #define NRF24L01_IRQ_READ() HAL_GPIO_ReadPin(NRF24L01_IRQ_GPIO_PORT , NRF24L01_IRQ_GPIO_PIN)+ h& N( j8 _: k! e5 t
: G d& N5 A4 t( Z- void NRF24L01_GPIO_Init(void)
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- GPIO_InitTypeDef gpio_init_struct;& ], M6 m! X \, J; v8 J) }
- NRF24L01_CS_GPIO_CLK_ENABLE;
2 @' i# m) C: j+ m) c - NRF24L01_CE_GPIO_CLK_ENABLE;
. M; B1 I6 o7 K. P - NRF24L01_IRQ_GPIO_CLK_ENABLE;
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- gpio_init_struct.Mode = GPIO_MODE_OUTPUT_PP;
) w6 p* a6 u$ f4 m0 N: ^: s - gpio_init_struct.Pull = GPIO_PULLUP;
n. n) v* x+ c3 \, \: ? - gpio_init_struct.Speed = GPIO_SPEED_FREQ_HIGH;
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7 _. O/ z c! V1 I9 Z+ _ - gpio_init_struct.Pin = NRF24L01_CS_GPIO_PIN; |; L' Y' E: {+ [ C2 J& U0 B# G: [
- HAL_GPIO_Init(NRF24L01_CS_GPIO_PORT , &gpio_init_struct);
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- gpio_init_struct.Pin = NRF24L01_CE_GPIO_PIN;
- I1 [, }) \2 ~. q7 J - HAL_GPIO_Init(NRF24L01_CE_GPIO_PORT , &gpio_init_struct);
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3 g! V% j5 ]* ] - gpio_init_struct.Mode = GPIO_MODE_INPUT;
, g* u5 W2 D- n2 e - gpio_init_struct.Pin = NRF24L01_IRQ_GPIO_PIN;# `3 e' S& b/ e( G: p5 g. w
- HAL_GPIO_Init(NRF24L01_IRQ_GPIO_PORT , &gpio_init_struct);: h$ K( D$ B+ {' Y7 M$ G h+ ` k
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- NRF24L01_CE_LOW;
. t2 e: K. l! Z - NRF24L01_CS_HIGH;
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/ X# n* c$ P& w" n4 {. b8 B' M& eNRF24L01有五个寄存器是可以用来检测器件是否正常工作的:
4 N( @, w1 j) L- uint8_t NRF24L01_Check(void)
5 {, I* v; e5 L& e - {
& F8 S9 v! ^/ k! b2 A; z - uint8_t buf[5] = {0xa5 , 0xa5 , 0xa5 , 0xa5 , 0xa5};
9 h; d8 _0 b1 h2 W" k. @ - uint8_t i;
# w) w' o+ f& `2 A" E - NRF24L01_Write_Buf(NRF_WRITE_REG + TX_ADDR , buf , 5);
- Y5 n2 b/ T" c! k8 T5 w9 } - NRF24L01_Read_Buf(TX_ADDR , buf , 5);
3 ^; `! ~1 k$ q, N% I7 ?; Z" i - for(i = 0 ; i < 5 ; i++)2 d% u) S$ J, O( @3 b, S
- if(buf[i] != 0XA5), C- n# |) G. u; ]/ o% |7 h! ]
- break;
- ^8 j: \% p: N! P7 k- m% a( x/ i/ a - if(i!=5)
' R N8 C- I7 O" Q: T - return 1;* |" R$ \8 h6 Q8 I# Z
- return 0;
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复制代码 / Z! }5 J! D5 u/ s F
NRF24L01模块在同一时间只能设置为只接收或者只发送模式,属于半双工器件,要实现全双工收发需要两个模块:
5 M8 x7 c" N% a8 f5 m- g5 k6 i' f- void NRF24L01_RX_Mode(void)* B( m# L& A8 i! b
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- NRF24L01_CE_LOW;* e* C/ V7 F9 V2 w5 N: w( X I# b
- NRF24L01_Write_Buf(NRF_WRITE_REG+RX_ADDR_P0,(uint8_t*)RX_ADDRESS,RX_ADR_WIDTH);
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- NRF24L01_Write_Reg(NRF_WRITE_REG+EN_AA,0x01); $ U: u+ ~% ?9 ?
- NRF24L01_Write_Reg(NRF_WRITE_REG+EN_RXADDR,0x01);
; @! c$ p2 ?4 U1 M3 q! B - NRF24L01_Write_Reg(NRF_WRITE_REG+RF_CH,40);
, ~. e. x" q& o& N9 R; Y h - NRF24L01_Write_Reg(NRF_WRITE_REG+RX_PW_P0,RX_PLOAD_WIDTH);% j ~: x7 F# T7 J; k* p. h& t
- NRF24L01_Write_Reg(NRF_WRITE_REG+RF_SETUP,0x0f);
+ F- ?0 ]/ f# W) i2 S4 r - NRF24L01_Write_Reg(NRF_WRITE_REG+CONFIG, 0x0f);3 z7 ~4 `# K' _) X* K
- NRF24L01_CE_HIGH;
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" ~( P) e, L7 m8 w$ F: @: D0 e- void NRF24L01_TX_Mode(void)4 e0 Q) g# [, v6 C1 T2 C4 F
- {
. L2 [4 s6 ~9 ?, K1 V" u - NRF24L01_CE_LOW;
+ E# \9 i- ?# B0 x9 } - NRF24L01_Write_Buf(NRF_WRITE_REG+TX_ADDR,(uint8_t*)TX_ADDRESS,TX_ADR_WIDTH);
+ L2 ]' C) Y n! k' [: r I4 B: i+ w$ U - NRF24L01_Write_Buf(NRF_WRITE_REG+RX_ADDR_P0,(uint8_t*)RX_ADDRESS,RX_ADR_WIDTH);
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- NRF24L01_Write_Reg(NRF_WRITE_REG+EN_AA,0x01);! I( X, w+ p# h0 ]
- NRF24L01_Write_Reg(NRF_WRITE_REG+EN_RXADDR,0x01);- k( f3 S( x; b3 e
- NRF24L01_Write_Reg(NRF_WRITE_REG+SETUP_RETR,0x1a);, R8 W U8 r) r4 |- n: \' j" f
- NRF24L01_Write_Reg(NRF_WRITE_REG+RF_CH,40);
5 e! \3 {+ \5 E - NRF24L01_Write_Reg(NRF_WRITE_REG+RF_SETUP,0x0f);" H6 q# x) i: [, E8 f- P* O3 O
- NRF24L01_Write_Reg(NRF_WRITE_REG+CONFIG,0x0e);
& B6 H) `0 f8 P+ Q8 c h5 e9 I* a - NRF24L01_CE_HIGH;$ G! _- ]( S8 c4 ^% z& o( A
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- uint8_t NRF24L01_RxPacket(uint8_t *rxbuf)
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- uint8_t sta; % F# P( o$ A6 P& U* i
- sta = NRF24L01_Read_Reg(STATUS);
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- NRF24L01_Write_Reg(NRF_WRITE_REG + STATUS , sta);( H& L1 ^! w# r& {. n
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- if(sta & RX_OK)
% ?1 d4 q8 V6 O! w, I' s - {
9 j5 Q0 y9 k; Y5 h/ t - printf("sta = 0x%x RX_OK.\n" , sta);
: Z; N) C5 X2 K N. I( V0 h - NRF24L01_Read_Buf(RD_RX_PLOAD , rxbuf , RX_PLOAD_WIDTH);3 M# S h1 z( N& }$ ^" Y8 a* A7 M
- NRF24L01_Write_Reg(FLUSH_RX , 0xff);( e7 e4 p3 b( ]# T+ f0 C8 q$ p
- return 0;
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" Y. O3 o! s2 S9 H3 S! W4 v - return 1;/ _& ~+ r1 t' M4 k: J4 l4 b
- }
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; P5 w& E' f! J; Q( C$ [8 B- uint8_t NRF24L01_TxPacket(uint8_t *txbuf)" B& f$ x, `: A
- {
! t' ]1 w% ]# Q. ]8 ^ - uint8_t sta;
* ~; A: Z) c6 t/ E1 P/ { - NRF24L01_CE_LOW;5 Q- r6 _& {) i; K
- NRF24L01_Write_Buf(WR_TX_PLOAD,txbuf,TX_PLOAD_WIDTH);
: x# G8 Q; E k( r/ I- b, e - NRF24L01_CE_HIGH;
& z+ x/ n* R' G v$ O - while(NRF24L01_IRQ_READ() != 0);6 ], B6 [6 e$ B1 O! z
- sta = NRF24L01_Read_Reg(STATUS);
( K5 q! q, s5 s, c - NRF24L01_Write_Reg(NRF_WRITE_REG+STATUS,sta);
, I; F4 e) Y8 j- d - if(sta&MAX_TX)
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- NRF24L01_Write_Reg(FLUSH_TX,0xff);. f. q3 v5 n1 C
- return MAX_TX;, j$ B5 h( s5 k6 y4 U, }& O- k
- }
- M; D2 j6 l2 v. X$ m- P - if(sta&TX_OK)- h# ]& N& `+ e! \* L2 F& J
- {5 ~0 K3 @9 r* ~
- return TX_OK;
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- N8 N% e; f# ?" h9 ~# t - return 0xff;
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复制代码 9 h, y0 U( b* \" ?' o
我这里在主界面创建一个flexButton用于控制NRF24L01模块发送一行数据:
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/ S: V5 U) |: j; [看看发送效果,按下fb之后,H7R7开发板会通过NRF24L01模块发送一行字符串,另一个设置了相同接收地址的NRF24L01开发板就会收到这个字符串:
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然后是接收,接收就更简单了,只需要设置模块为接收模式后,在Tick事件回调函数调用即可:
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