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我在网上找到你们的代码。我复制了一下。有些问题想了解一下
void I2C_GPIO_Configuration(void)
{: B9 b2 {0 `) _/ L/ B7 X0 K2 f) u, |
GPIO_InitTypeDef GPIO_InitStruct;
+ j6 \! p- W+ ^
/* Enable GPIOA clock */. A; z) Z8 @% v( F& U! W' |1 v
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/*!< sEE_I2C Periph clock enable */) P1 g5 \6 q! g( N' z# u3 y) q
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1 , ENABLE);6 i5 A' s# n5 C# z' {0 W/ v
/*!< GPIO configuration */
/*!< Configure sEE_I2C pins: SCL */2 L) ?8 c$ i; v( `
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;//GPIO_Mode_IN
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_Level_3;
GPIO_InitStruct.GPIO_OType = GPIO_OType_OD;//open-drain
GPIO_Init(GPIOA , &GPIO_InitStruct);
/*!< Configure sEE_I2C pins: SDA */! X# \6 W- i- W Q+ ~
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_10;9 o4 B/ m+ E$ H% K; ~5 Y
GPIO_Init(GPIOA, &GPIO_InitStruct);
/* Connect PXx to I2C_SCL*/
GPIO_PinAFConfig( GPIOA , GPIO_PinSource9, GPIO_AF_4);
/* Connect PXx to I2C_SDA*/$ a+ u& u5 O8 [/ i' t
GPIO_PinAFConfig( GPIOA ,GPIO_PinSource10, GPIO_AF_4);
}
$ u! O* ?3 q& }7 K% S* g9 S
//IIC从模式配置，在配置时，需要设置地址，在这里设置为0XA0，而从设备的时钟属于被动模式，有IIC的主端确定。
void I2C_Configuration(void)/ }5 a$ Z( E( F0 @+ r- D
{
I2C_InitTypeDef I2C_InitStruct; - g% ]- r9 @# G& E
NVIC_InitTypeDef NVIC_InitStructure;. n" ~& h5 {- x1 F! R
/* I2C configuration */6 }. z" i3 z) R, f. A* w% v0 G
I2C_InitStruct.I2C_Mode = I2C_Mode_I2C;
I2C_InitStruct.I2C_AnalogFilter = I2C_AnalogFilter_Enable;% A4 C4 m4 _' j9 V, a
I2C_InitStruct.I2C_DigitalFilter = 0x00;8 K2 }2 T% C1 D3 g
I2C_InitStruct.I2C_OwnAddress1 = ADDR;" u" C/ a6 ?0 D) D z
I2C_InitStruct.I2C_Ack = I2C_Ack_Enable;+ X$ O, M7 D- B* _4 ?* p
I2C_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; , \! }$ g' l* y q0 G
I2C_InitStruct.I2C_Timing = 0xb0420f13; //100Kbits) \5 N6 t9 c8 M0 F- `
/* I2C Peripheral Enable */( J1 _$ G# d. g
I2C_Cmd(I2C1, ENABLE);
/* Apply I2C configuration after enabling it */2 d2 z: x% k: {3 F; U' G
I2C_Init(I2C1, &I2C_InitStruct);' o- L& | o, m. }/ F6 M8 q, x
I2C1->CR1 |= (I2C_CR1_ADDRIE | I2C_CR1_STOPIE | I2C_CR1_TXIE | I2C_CR1_RXIE);
//---------------------------- Peripheral and DMA interrupts Initialization ------------------
// Initialize I2C1 interrupts: m3 Q+ m: d+ _2 I0 I k, G9 E2 _
/* Enable the IRQ channel */; ^! u1 X5 T' K0 l# |0 H! ~1 D
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;* ?9 _* z! [/ a5 s
/* Configure NVIC for I2C1 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = I2C1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 2;
NVIC_Init(&NVIC_InitStructure);
8 H, ~7 I; b% w* e; q$ |
}- F/ I; {& d! K, O1 Q3 F7 P# O
k8 Y. v( U7 x* |
//下面是IIC中断函数的实现* Z2 X8 f1 A- Z, A3 o0 b# N: A
void I2c_Init(void)
{, _# h7 b4 C" K+ u1 [ A6 s
I2C_GPIO_Configuration();
I2C_Configuration();
}" G6 M+ h: w/ Z- l; b* c
void I2C1_IRQHandler(void)( e1 n T, q- H' p
{
u32 AddCode;
// I2C_ClearITPendingBit(I2C1, I2C_ISR_ADDR | I2C_ISR_STOPF |I2C_ISR_ADDCODE );
__IO uint32_t I2CFlagStatus = 0x00000000;4 H3 J" C7 M g/ c( g
I2CFlagStatus = (uint32_t)(I2C1->ISR & (uint16_t)0x0000100FE);+ s% ~' `; H v0 R3 H2 G8 [
: C [0 s. ^' f/ G. E2 P, [
// printf("recv data\r\n");* L* Z5 i* `6 n) V
if ((I2CFlagStatus & I2C_ISR_ADDR) != 0)
{
AddCode = (I2C1->ISR & 0xfe0000); //读取ADDCODE 32：17位
printf("匹配地址2 0x%x： \r\n",AddCode >> 17 );
if(I2C1->ISR&I2C_ISR_DIR) //tx mode
{, L2 P) f V: F/ B- M. L
printf("发送模式 \r\n");' d, o+ c+ W3 R+ F, K, h, ]
Tx_count = 0;
I2C1->ISR |= I2C_ISR_TXE;# U* e$ w, q M; V& E0 M" ]
I2C1->ICR |= I2C_ICR_ADDRCF;
if(I2C_GetITStatus( I2C1, I2C_IT_RXNE) != 0)7 {+ m% W g2 d' z0 |
{
Rx_buffer[Rx_count++]=I2C_ReceiveData(I2C1);
if(Rx_count>=Rx_MAX)
{
Rx_count=0;
//rx ok
}
printf("Rx_buffer : %s\r\n",Rx_buffer);& b# G4 z9 a/ u) ?" l4 y
}
}
if((I2C1->ISR&I2C_ISR_DIR)==0) //rx mode/ g* ?5 S+ N1 y X! Q! _) Z
{
printf("接收模式 \r\n");, d: `& W! `9 p- h2 r
Rx_count= 0;
I2C1->ICR |= I2C_ICR_ADDRCF;
}% N* C) _ _( J
}0 p8 N8 L1 x0 m0 L6 Y& j8 ~8 w& Y
else if(I2C_GetITStatus( I2C1, I2C_IT_RXNE) != 0)
{
Rx_buffer[Rx_count++]=I2C_ReceiveData(I2C1);
if(Rx_count>=Rx_MAX)
{
Rx_count=0;+ u G, c# f& M4 G9 A
//rx ok3 H; K. g% }4 z
}
printf("Rx_buffer : %s\r\n",Rx_buffer);
}" e* M8 R0 R4 A" s+ i2 Q* l9 _& o
else if ((I2CFlagStatus & I2C_ISR_TXIS) != 0)
{
I2C_SendData(I2C1,Tx_buffer[Tx_count++]);+ c/ @, d" n$ l) ^) m
if(Tx_count >= Tx_MAX) |3 y! T. G4 ^+ f* v, v
{" t! e. c( H0 @* e* u" C+ v% B
Tx_count = 0;4 b N2 k; w! c7 x! ^0 r* P6 V: N
//tx ok8 l% F( H% ?+ n# |2 t7 c9 q
}$ I& C" ~. [2 L: Q" _
}
else if ((I2CFlagStatus & I2C_ISR_STOPF) != 0)7 I9 F4 B+ G6 x' m: m4 c0 ~
{% _' _% [/ t0 a* G7 }
printf("停止检查标志位 \r\n");/ B* f+ S9 s. r5 N \
I2C1->ICR |= I2C_ICR_STOPCF;3 @, {- K6 l# y/ X" w! S7 H
Rx_count = 0;
Tx_count = 0;
}! m' p& n2 ]$ w9 l9 l8 D0 c/ D
}
这个是可以匹配到ADDCODE ,但是没有接收到数据的，我没仔细看这个时序寄存器的配置。不知道是不是由于时序不匹配造成没有接收到数据，还是因为ack没有给出造成读不到数据的。
void I2C_GPIO_Configuration(void)
{, u8 n. v6 R+ T! x
GPIO_InitTypeDef GPIO_InitStruct; + J1 a1 y8 V# ^1 H" W& n
. U3 J y9 J1 J; _& K$ U# Y
/* Enable GPIOA clock */7 h+ E9 s- ^3 ^+ E5 J6 c
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/*!< sEE_I2C Periph clock enable */4 i6 Q7 | S+ ?9 r( f- S
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1 , ENABLE);
/*!< GPIO configuration */
/*!< Configure sEE_I2C pins: SCL */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;//GPIO_Mode_IN9 ?* I4 l" P9 ]& [9 _$ c/ l
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_Level_3;) W. P, n# ?2 `8 L3 k; b0 s( H
GPIO_InitStruct.GPIO_OType = GPIO_OType_OD;//open-drain
GPIO_Init(GPIOA , &GPIO_InitStruct);+ b+ o: {8 j, `0 p9 a2 z) X; r
) Q- C% {# \2 |$ S4 b
/*!< Configure sEE_I2C pins: SDA */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_10;
GPIO_Init(GPIOA, &GPIO_InitStruct);
/* Connect PXx to I2C_SCL*/4 ]6 T* Z# D v2 t
GPIO_PinAFConfig( GPIOA , GPIO_PinSource9, GPIO_AF_4); ' s" t0 ^" ^3 ?
/* Connect PXx to I2C_SDA*/
GPIO_PinAFConfig( GPIOA ,GPIO_PinSource10, GPIO_AF_4);; R/ n* d3 S+ `! q
}* I/ y4 O" n, G, L6 ?3 P/ g0 H6 x
2 }5 F3 B6 |, s6 \
//IIC从模式配置，在配置时，需要设置地址，在这里设置为0XA0，而从设备的时钟属于被动模式，有IIC的主端确定。4 v. N4 ?4 `8 H* X) L2 W$ u1 q, z
void I2C_Configuration(void)" {& O) q* l# k
{
I2C_InitTypeDef I2C_InitStruct;
NVIC_InitTypeDef NVIC_InitStructure;$ k1 `# R( ~- u& A$ ?" D9 p( g
/* I2C configuration */
I2C_InitStruct.I2C_Mode = I2C_Mode_I2C;: ~& m- R4 V) b3 F1 e9 [5 @ v
I2C_InitStruct.I2C_AnalogFilter = I2C_AnalogFilter_Enable;* {, ~/ i; k! z4 ]# e4 e
I2C_InitStruct.I2C_DigitalFilter = 0x00;
I2C_InitStruct.I2C_OwnAddress1 = ADDR;% k1 p+ u e4 G7 k8 O2 B; h- C: y
I2C_InitStruct.I2C_Ack = I2C_Ack_Enable;* t& x+ r3 z8 r' t0 b
I2C_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; $ r7 Q: b4 L9 [8 E% d. k/ q; W
I2C_InitStruct.I2C_Timing = 0xb0420f13; //100Kbits
/* I2C Peripheral Enable */$ | O2 v) x/ m3 x% W9 Y
I2C_Cmd(I2C1, ENABLE);3 n" Q4 V% q; }) I
/* Apply I2C configuration after enabling it */
I2C_Init(I2C1, &I2C_InitStruct);
I2C1->CR1 |= (I2C_CR1_ADDRIE | I2C_CR1_STOPIE | I2C_CR1_TXIE | I2C_CR1_RXIE);
//---------------------------- Peripheral and DMA interrupts Initialization ------------------, T" _1 f$ S2 s( l: B) |, M
// Initialize I2C1 interrupts4 |/ E2 j7 i( m1 f ^# Q. H
/* Enable the IRQ channel */
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;5 a, Z$ a& c1 _% }/ S
/* Configure NVIC for I2C1 Interrupt */: z4 s( j, k! V/ z& R9 `) _
NVIC_InitStructure.NVIC_IRQChannel = I2C1_IRQn;( E* r' }6 L6 D& h; S# u A
NVIC_InitStructure.NVIC_IRQChannelPriority = 2;, v) R4 k& O" K' u2 W3 k1 c
NVIC_Init(&NVIC_InitStructure); / ~) F# u/ [% D2 P7 _
}5 n) M2 ]5 G' ^' x9 }
//下面是IIC中断函数的实现
$ K2 l- o$ t0 U% \- z( f
void I2c_Init(void)
{
I2C_GPIO_Configuration();
I2C_Configuration();
}5 _0 t% B" r$ K/ \
3 l3 U' k3 \! e% L7 {+ x' k
void I2C1_IRQHandler(void); _; I& j' O6 l% o, p. z: |* t
{' t- _- w- C9 `# _! d/ p
u32 AddCode;* z1 e7 D$ C* N1 M3 s
// I2C_ClearITPendingBit(I2C1, I2C_ISR_ADDR | I2C_ISR_STOPF |I2C_ISR_ADDCODE );
__IO uint32_t I2CFlagStatus = 0x00000000;
I2CFlagStatus = (uint32_t)(I2C1->ISR & (uint16_t)0x0000100FE);
// printf("recv data\r\n");, v- Y; Y* D( E9 l5 P
if ((I2CFlagStatus & I2C_ISR_ADDR) != 0)$ e& r* w) n/ R) _3 u! {# ~
{8 T8 F5 S' w' [: {
AddCode = (I2C1->ISR & 0xfe0000); //读取ADDCODE 32：17位5 n6 }9 {- p& D9 \- Y$ f5 y$ _
printf("匹配地址2 0x%x： \r\n",AddCode >> 17 );2 U) k; w; U2 T7 C! u& x5 y" G
! G& {9 }7 O6 ^) n; ~4 E
if(I2C1->ISR&I2C_ISR_DIR) //tx mode2 d F/ c# b$ [7 r: E8 u2 v3 P: n) d
{' _* O0 s( Y; X+ q. G' I* A
printf("发送模式 \r\n");
Tx_count = 0;
I2C1->ISR |= I2C_ISR_TXE;
I2C1->ICR |= I2C_ICR_ADDRCF;
* S1 w# B h! E" p J
if(I2C_GetITStatus( I2C1, I2C_IT_RXNE) != 0)
{
Rx_buffer[Rx_count++]=I2C_ReceiveData(I2C1);2 ?9 }# o0 A) f8 w) t6 E
if(Rx_count>=Rx_MAX)( D; z# r) I' [. R) ^
{
Rx_count=0;) S/ L9 v6 L/ B5 Z
//rx ok
}
printf("Rx_buffer : %s\r\n",Rx_buffer);4 ^! p4 }, n/ T
}7 @' l' `- m4 K) U: s$ \5 j
}
if((I2C1->ISR&I2C_ISR_DIR)==0) //rx mode2 j( i, Z# t4 }; a
{
printf("接收模式 \r\n");
Rx_count= 0;
I2C1->ICR |= I2C_ICR_ADDRCF; 8 X E' M! l* K1 v5 z5 Z
}
}
else if(I2C_GetITStatus( I2C1, I2C_IT_RXNE) != 0), b! y1 m) ^7 ]% X% R7 M
{& P( x& y) `/ B6 z' @, O
Rx_buffer[Rx_count++]=I2C_ReceiveData(I2C1);
if(Rx_count>=Rx_MAX)9 [" [6 D% t. K% j3 V& I, X1 C
{9 M7 G# k: c: f8 }: @5 N4 L7 D% u
Rx_count=0;
//rx ok* C/ O# t' g8 H' ~) M" ^4 e
}
printf("Rx_buffer : %s\r\n",Rx_buffer);+ q+ k/ d. P* W4 q- q5 q
}
else if ((I2CFlagStatus & I2C_ISR_TXIS) != 0)
{
I2C_SendData(I2C1,Tx_buffer[Tx_count++]);+ T* H& E4 p9 O/ |. J# `! S8 }
if(Tx_count >= Tx_MAX)2 g- l9 p; ?$ o+ ?9 ]: w* q
{
Tx_count = 0;0 a$ }# z+ x7 c$ l' i
//tx ok
}
}; ^2 D3 H4 _# l# L
else if ((I2CFlagStatus & I2C_ISR_STOPF) != 0)' A8 S7 ^6 v7 b+ h/ u5 Y9 T
{
printf("停止检查标志位 \r\n");
I2C1->ICR |= I2C_ICR_STOPCF;! N) Z6 K% |6 m7 G+ m' s
Rx_count = 0;
Tx_count = 0; i+ E; n+ S' Q4 s" g6 u
}
}