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& H) z( f8 Z A
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/ C7 E: A# |) L# t, `4 X3 {. I1 ?
void I2C_GPIO_Configuration(void)
{" r# w) K* |' Z7 E
GPIO_InitTypeDef GPIO_InitStruct; 6 B4 b' C6 u `
/* Enable GPIOA clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/*!< sEE_I2C Periph clock enable */+ H" B5 F' y) w& h. Y
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1 , ENABLE);) `5 Z y2 b$ {, ]' o$ @
/*!< GPIO configuration */
/*!< Configure sEE_I2C pins: SCL */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9;2 t+ ]$ D. J6 x* X8 B, Z6 R
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);3 F% l% B- a( l7 E& t$ a
- H2 t$ Y% ~4 X
/*!< Configure sEE_I2C pins: SDA */) B- F! T/ o; | {; ^0 `4 ~
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_10;
GPIO_Init(GPIOA, &GPIO_InitStruct);. U/ ^ W$ D: G& k- \5 I4 _1 m
/* Connect PXx to I2C_SCL*/0 @, B; u' N, ^) Z
GPIO_PinAFConfig( GPIOA , GPIO_PinSource9, GPIO_AF_4); r8 m$ \) E/ e g: I4 I ~
/* Connect PXx to I2C_SDA*/ x7 n) C; o3 r( q+ f
GPIO_PinAFConfig( GPIOA ,GPIO_PinSource10, GPIO_AF_4);, G, R" W3 `# r9 p. u2 ?! D! z
}) _* O# B7 m# ~+ T- g
$ e, _- l: w4 U2 m
//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。9 J4 P" m9 ^8 P" k8 Z; A" e
void I2C_Configuration(void)" @! U2 m9 c- ~/ P4 R
{! h) r9 y1 }; C0 M' Q: J6 L
I2C_InitTypeDef I2C_InitStruct; ( y: O/ W: c9 v
NVIC_InitTypeDef NVIC_InitStructure;" K) ]' x/ Z% w0 ^- s* R2 ~. f/ F
; F' [+ ~% @+ p& r% i
/* I2C configuration */- ?6 s' n q Q; ]2 W
I2C_InitStruct.I2C_Mode = I2C_Mode_I2C;
I2C_InitStruct.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
I2C_InitStruct.I2C_DigitalFilter = 0x00;% Q5 G6 q5 J1 ^8 T/ N" y
I2C_InitStruct.I2C_OwnAddress1 = ADDR;
I2C_InitStruct.I2C_Ack = I2C_Ack_Enable;3 s O3 _+ |; S# N) T$ K3 n
I2C_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; $ ]( |0 h4 U& F3 `
I2C_InitStruct.I2C_Timing = 0xb0420f13; //100Kbits
/* I2C Peripheral Enable */: c: p1 c$ K9 e# K% U& }. _) q
I2C_Cmd(I2C1, ENABLE);
/* Apply I2C configuration after enabling it */
I2C_Init(I2C1, &I2C_InitStruct);8 B, V5 S: n+ O
* V: g/ Y" A5 B+ M8 X5 x3 C4 L4 a
I2C1->CR1 |= (I2C_CR1_ADDRIE | I2C_CR1_STOPIE | I2C_CR1_TXIE | I2C_CR1_RXIE);/ [# p0 \$ i/ A- \6 g, m7 p
//---------------------------- Peripheral and DMA interrupts Initialization ------------------( q* c9 x/ q9 t9 N, z5 O" U
// Initialize I2C1 interrupts5 f, q: D. ]) e. m
/* Enable the IRQ channel */+ i. \1 k V! c. f5 _! p' ?
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;7 A' [7 N+ R9 s
/* Configure NVIC for I2C1 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = I2C1_IRQn;. p! `" W" e g" m
NVIC_InitStructure.NVIC_IRQChannelPriority = 2;3 E& w1 v9 A. n, Q3 f/ `
NVIC_Init(&NVIC_InitStructure);
. [: j4 _ C: H; `
}
4 A1 j1 f9 ^0 b2 K( a
//下面是IIC中断函数的实现6 u3 y. J& k! c, c3 x: ^
void I2c_Init(void)
{
I2C_GPIO_Configuration();' ]# p6 q& C7 O
I2C_Configuration();1 a1 W$ \9 R, W2 I( F8 F& f
}
" x; H8 I$ c( u( g& {* {/ k% V/ H
void I2C1_IRQHandler(void)
{
u32 AddCode;
// 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");' K" a( C+ ]5 G- z8 J
if ((I2CFlagStatus & I2C_ISR_ADDR) != 0)* g' t1 ]" Z, q2 u- f/ E' h- T
{
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 mode7 ~5 E( B o( D- w, m
{/ b7 h9 G! M5 g. J3 W2 c+ ?6 M" y9 A" ~
printf("发送模式 \r\n");9 S7 D% v0 d9 p% j
Tx_count = 0;- a0 t9 S( q+ G+ R& H' J# I* ^
I2C1->ISR |= I2C_ISR_TXE; w! h8 j4 Y& ~
I2C1->ICR |= I2C_ICR_ADDRCF;
if(I2C_GetITStatus( I2C1, I2C_IT_RXNE) != 0)
{
Rx_buffer[Rx_count++]=I2C_ReceiveData(I2C1);
if(Rx_count>=Rx_MAX)
{, H% `6 q. v' T
Rx_count=0;
//rx ok
}
printf("Rx_buffer : %s\r\n",Rx_buffer);
}
} ; }5 C% Q! |& a
if((I2C1->ISR&I2C_ISR_DIR)==0) //rx mode
{# y. M* v6 g- J5 \( S6 q; j! N) S
printf("接收模式 \r\n");* y/ d8 h4 a& G* ~, w) C
Rx_count= 0;
I2C1->ICR |= I2C_ICR_ADDRCF; 0 l- c6 A6 m5 R# }: g
}
}) \8 q/ L$ X5 d0 z) s3 f
else if(I2C_GetITStatus( I2C1, I2C_IT_RXNE) != 0)5 j2 J: W7 [ _( N: |4 L9 t
{5 x, t/ r, s, X# }% U3 d
Rx_buffer[Rx_count++]=I2C_ReceiveData(I2C1);
if(Rx_count>=Rx_MAX)4 i" z1 b0 N% q8 K/ e, a1 B
{8 [' @, y4 u2 w9 O# @; o: q3 B' _" N
Rx_count=0;% f; X9 F; I8 C
//rx ok, |% R! j3 u9 r( r0 s/ S
}6 q5 T5 w/ h/ ?3 y0 s( X8 O: h
printf("Rx_buffer : %s\r\n",Rx_buffer);) C9 r: |* c7 m- b8 C! O0 e
}
else if ((I2CFlagStatus & I2C_ISR_TXIS) != 0); O+ m. j: }. o5 Z3 _6 }! U
{, j2 O! S3 E5 L8 a- r
I2C_SendData(I2C1,Tx_buffer[Tx_count++]);8 n1 ` b9 \* r) A4 u* M9 g
if(Tx_count >= Tx_MAX)
{
Tx_count = 0;
//tx ok
}
}% n) Q, j: ^0 x" p( G8 k% A
else if ((I2CFlagStatus & I2C_ISR_STOPF) != 0)' b- C/ q4 r* A# y$ ^* v
{
printf("停止检查标志位 \r\n");+ \$ O) U3 d! u' `/ n% N* x
I2C1->ICR |= I2C_ICR_STOPCF;
Rx_count = 0;
Tx_count = 0;1 Y2 ^4 F% H" l7 W6 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)
{
GPIO_InitTypeDef GPIO_InitStruct; - F2 P! T/ M$ H9 m2 Q' ^1 h
/* Enable GPIOA clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE); $ V, b3 S1 F- d. _4 {
/*!< sEE_I2C Periph clock enable */4 p, T: i( b& @; `& y
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1 , ENABLE);" n. k0 I, i; ~+ w/ S' N+ S
/*!< GPIO configuration */ - R$ Z- b6 G4 }! ^
/*!< Configure sEE_I2C pins: SCL *// V/ h/ X2 ^, ^! i8 t3 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 */5 L0 s$ [/ M4 o5 k
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_10;
GPIO_Init(GPIOA, &GPIO_InitStruct);
' e# \. x/ M2 A
/* Connect PXx to I2C_SCL*/
GPIO_PinAFConfig( GPIOA , GPIO_PinSource9, GPIO_AF_4);
/* Connect PXx to I2C_SDA*/! {' o, J5 u( u9 o
GPIO_PinAFConfig( GPIOA ,GPIO_PinSource10, GPIO_AF_4);
}* N2 Q4 m0 H2 Z9 r- D' `5 m* a
8 [- m! Z( c, v9 X
//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。; P5 Y& y3 Y5 s; C1 _- c0 N* l
void I2C_Configuration(void)
{
I2C_InitTypeDef I2C_InitStruct;
NVIC_InitTypeDef NVIC_InitStructure;
/* I2C configuration */
I2C_InitStruct.I2C_Mode = I2C_Mode_I2C;1 e- D4 ~# f5 [
I2C_InitStruct.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
I2C_InitStruct.I2C_DigitalFilter = 0x00;
I2C_InitStruct.I2C_OwnAddress1 = ADDR;
I2C_InitStruct.I2C_Ack = I2C_Ack_Enable;( c" Q+ X$ E G- ?" f
I2C_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStruct.I2C_Timing = 0xb0420f13; //100Kbits
/* I2C Peripheral Enable */
I2C_Cmd(I2C1, ENABLE);
/* Apply I2C configuration after enabling it */2 z+ M N; I( K7 v' o8 T2 A
I2C_Init(I2C1, &I2C_InitStruct);
I2C1->CR1 |= (I2C_CR1_ADDRIE | I2C_CR1_STOPIE | I2C_CR1_TXIE | I2C_CR1_RXIE);
//---------------------------- Peripheral and DMA interrupts Initialization ------------------
// Initialize I2C1 interrupts
/* Enable the IRQ channel */
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;/ V( M6 O* q. m$ O( X) {
3 {/ n3 o% F9 q
/* Configure NVIC for I2C1 Interrupt */& I& P6 |8 w0 ~) `
NVIC_InitStructure.NVIC_IRQChannel = I2C1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 2;
NVIC_Init(&NVIC_InitStructure); @% T* M o" D5 s; v
G0 a9 |+ ^1 P0 N& Y; A" I1 ~
}8 _. `; f8 n' a5 S
& E2 }) Z! h1 S' B3 H" Z
//下面是IIC中断函数的实现% [4 I* j2 J4 s# i+ S% K
* p, a6 r! a2 {
void I2c_Init(void)0 N* g1 {3 F3 r& \" r) e9 _
{. O+ J4 @; U- y: Q" G# i9 ]
I2C_GPIO_Configuration();
I2C_Configuration();+ e$ e9 s6 ^# |; q5 Z$ K
}; J( k' A, b4 H. O8 {% P! j
void I2C1_IRQHandler(void)% _* A. b% z( ?
{
u32 AddCode;4 @" Z& _) w+ ?& o
// I2C_ClearITPendingBit(I2C1, I2C_ISR_ADDR | I2C_ISR_STOPF |I2C_ISR_ADDCODE );
__IO uint32_t I2CFlagStatus = 0x00000000;( i# r( D: {1 ]: a2 F9 m$ ~% t
I2CFlagStatus = (uint32_t)(I2C1->ISR & (uint16_t)0x0000100FE);+ w. {! [- P4 |5 t: _6 J5 G8 o
+ g5 J0 e) O) T- ^
// printf("recv data\r\n");
if ((I2CFlagStatus & I2C_ISR_ADDR) != 0), u B8 A* W* g
{1 [9 Z1 ^0 L$ C0 z) G
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 mode9 x! d3 V1 I1 A
{0 C- d" ?; Y* s
printf("发送模式 \r\n");* Z* }0 p5 S/ R" a* c( H! f
Tx_count = 0;
I2C1->ISR |= I2C_ISR_TXE;7 |: V: q$ Z/ \( i7 i) _
I2C1->ICR |= I2C_ICR_ADDRCF;
if(I2C_GetITStatus( I2C1, I2C_IT_RXNE) != 0)8 @3 v1 m! S& H$ w
{; e+ [9 C5 v+ W- t' y
Rx_buffer[Rx_count++]=I2C_ReceiveData(I2C1);2 h \% T$ b5 b& L1 M N
if(Rx_count>=Rx_MAX)
{/ D! |5 E+ c; r) M( S
Rx_count=0;
//rx ok
}
printf("Rx_buffer : %s\r\n",Rx_buffer);
}
}
if((I2C1->ISR&I2C_ISR_DIR)==0) //rx mode8 |4 h" t( i6 r: `; T* I- F4 p5 b2 F
{
printf("接收模式 \r\n");
Rx_count= 0;" A( M. z$ E( ~8 x& i! A, g9 W
I2C1->ICR |= I2C_ICR_ADDRCF;
}) k4 f* V* x6 H: ^4 }* J
}& z y0 i* z% u/ q
else if(I2C_GetITStatus( I2C1, I2C_IT_RXNE) != 0)
{ ~ E' U5 q" ?9 f$ I
Rx_buffer[Rx_count++]=I2C_ReceiveData(I2C1);
if(Rx_count>=Rx_MAX)
{
Rx_count=0;
//rx ok( Y/ e y, p" y, N0 h" t- f- n
}% A' N5 k y! Z6 e3 X4 L' E a( q
printf("Rx_buffer : %s\r\n",Rx_buffer);1 [: q8 `0 u( W! i3 J1 _+ M
}
else if ((I2CFlagStatus & I2C_ISR_TXIS) != 0): k! o; k' ~( w- `2 [
{) g1 @! j2 l* b7 |8 W! d0 O
I2C_SendData(I2C1,Tx_buffer[Tx_count++]);( \2 ?4 o$ I) {
if(Tx_count >= Tx_MAX)
{9 B0 X0 s6 e6 L1 @$ y5 `, {0 f
Tx_count = 0;
//tx ok) g6 z& b) j$ I- C+ ]
}/ H8 k+ r6 R5 o! z; n' x4 b- v
}
else if ((I2CFlagStatus & I2C_ISR_STOPF) != 0)
{
printf("停止检查标志位 \r\n");
I2C1->ICR |= I2C_ICR_STOPCF;9 ?* o3 f. L. P( B' R7 N9 ^
Rx_count = 0;/ I0 C4 d2 p, q! R0 o
Tx_count = 0;- Q8 n' e2 S$ d2 \
}4 @6 r, i, d. k5 d- |( y7 U
}