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void I2C_EEPROM_Init(void)' G. [- H, ]) Z3 g! t4 f/ F3 a- k { GPIO_I2CSCLInitial(); GPIO_I2CSDAInitial(); RCC->APB1ENR |= RCC_APB1ENR_I2CEN; /* (1) */ I2C_CHANNEL->TIMINGR = I2C_TIMINGR;' [2 x! U8 J, ^1 m- r! Q I2C_CHANNEL->CR1 = I2C_CR1_PE; /* (2) */' p: U* r$ I- ~* d/ I# q } void) t! ?: x5 S! c I2C_TransferConfig(uint8_t DevAddress, uint16_t Size,! X0 T. F' k! K) Q/ y& M uint32_t Mode,9 J5 s: l, S6 n2 B3 t uint32_t Request w7 l5 F% ? j. i ) { /* clear tmpreg specific bits */ V \4 \0 _9 ]% q, r I2C_CHANNEL->CR2 &= (uint32_t) ~((uint32_t)(I2C_CR2_SADD | I2C_CR2_NBYTES \$ B' _( H1 g9 E* }! o5 [6 ~ | I2C_CR2_RELOAD | I2C_CR2_AUTOEND | I2C_CR2_RD_WRN \ | I2C_CR2_START | I2C_CR2_STOP)); ' l C& B- [) K3 @$ {+ ] N" H* S /* update tmpreg */ #if I2C_ADDRESSINGMODE_7BIT I2C_CHANNEL->CR2 |= (uint32_t)(((uint32_t)(DevAddress << 1) & I2C_CR2_SADD) \ | (((uint32_t)Size << 16) & I2C_CR2_NBYTES) \ | (uint32_t)Mode | (uint32_t)Request); #else3 [( P, i6 }) [' d& v* ` I2C_CHANNEL->CR2 |= (uint32_t)(((uint32_t)DevAddress & I2C_CR2_SADD) \: l% y# T6 q" b+ W2 F: @ | (((uint32_t)Size << 16) & I2C_CR2_NBYTES) \ | (uint32_t)Mode | (uint32_t)Request);4 P+ v1 r4 m( n #endif+ S- L. R5 O: h" Z' {/ g } void! a( {% i. W/ B! K4 {) ~# v1 J I2C_Master_Transmit(uint8_t DevAddress,2 ~. k) z$ s# c$ K; [/ L9 e, Q uint8_t eerom_start_address,, F# H+ X& }7 v# g$ c8 @ const uint8_t * pData,* m9 W9 _8 O) K' N# e uint16_t Size ) {6 G+ f b0 y% j" V uint32_t sizetmp;, Y/ f) k) D0 g7 L v1 u# b 4 z% M3 d+ E9 G7 M3 W if ((pData == NULL) || (Size == 0)) {5 C9 R. k* o1 R9 `; _( `$ m return;- `( ?, Q. D" j3 `+ p }- E4 x. {, A C" w# Z$ ^ 5 U" e1 I4 C J' f8 j! S& j while (__HAL_I2C_GET_FLAG(I2C_ISR_BUSY)) {: y3 ]( S p% v7 m } /* Send Slave Address */ /* Set NBYTES to write and reload if size > I2C_MAX_BYTES and generate RESTART */0 R4 o) f5 L& r/ M* S3 P /* Size > I2C_MAX_BYTES, need to set RELOAD bit */ if (Size > I2C_MAX_BYTES) {2 l, R$ v6 z; r! F' |1 F+ m) u I2C_TransferConfig(DevAddress, I2C_MAX_BYTES, I2C_CR2_RELOAD, I2C_GENERATE_START_WRITE); sizetmp = I2C_MAX_BYTES;4 x8 {: x7 P( G9 I } else { I2C_TransferConfig(DevAddress, Size, I2C_CR2_AUTOEND, I2C_GENERATE_START_WRITE); sizetmp = Size; } / v, `' X- S$ g9 y while (!__HAL_I2C_GET_FLAG(I2C_ISR_TXIS)). v1 k0 x7 P$ x+ O* ^$ b m {* U' Q7 x$ O, {8 x6 @ } + F$ O; p8 Q0 \ b I2C_CHANNEL->TXDR = eerom_start_address; while ((Size - 1) > 0)# N4 [! N- z6 F8 U7 R) ?' q; ~1 J { /* Wait until TXIS flag is set *// J# t3 Q& W5 v* ^+ Z. [4 } while (!__HAL_I2C_GET_FLAG(I2C_ISR_TXIS))5 F% d: A, E1 ~% {" R {' ? }+ k- B' v9 f$ W! a$ Q7 c( r } 2 i$ Y( `# p+ c/ Z A# ?5 Q /* Write data to TXDR */ I2C_CHANNEL->TXDR = (uint32_t)*pData; pData++; sizetmp--;" ?" p6 x$ N f: d3 {, K0 j Size--;; V0 l; {& B* O; V7 p if ((sizetmp == 0) && (Size != 0))$ b) k8 G# P7 U; P: \/ |- m' s { /* Wait until TXE flag is set */) d: F# R) ^- Q while (!__HAL_I2C_GET_FLAG(I2C_ISR_TCR)) {8 x: x" W' g$ J1 {0 W6 D+ o! P }# a2 c, Y9 O( T if (Size > I2C_MAX_BYTES)) j) l( G& M, q2 o0 s! Z# H7 b, M; { {- D; ?; y# f/ Q1 o6 P8 Y- ^, @ I2C_TransferConfig(DevAddress, I2C_MAX_BYTES, I2C_CR2_RELOAD, I2C_NO_STARTSTOP); sizetmp = I2C_MAX_BYTES; } else { I2C_TransferConfig(DevAddress, Size, I2C_CR2_AUTOEND, I2C_NO_STARTSTOP);' Z7 u3 l" [: N8 g sizetmp = Size; }* ^2 D- w' @+ X- W }& y5 k/ L; t; R7 O' {9 J% X$ O }. [, ^. u; @5 B, P /* No need to Check TC flag, with AUTOEND mode the stop is automatically generated */) v' C" }! Z, d /* Wait until STOPF flag is set */ K" ]6 O+ A3 j, a/ x& c0 ^" g- Q while (!__HAL_I2C_GET_FLAG(I2C_ISR_STOPF))& {* B7 J8 z! B( S {# B/ M9 X; H# n }$ t* ~' v$ ?% L7 S, k& f7 r1 ? ( M9 x' K1 ~ k* i7 Z0 Q0 H /* Clear STOP Flag */ __HAL_I2C_CLEAR_FLAG(I2C_ISR_STOPF);' Y2 n* P2 E8 ]. |9 x; n8 O /* Clear Configuration Register 2 */9 I, D& Z' ?2 ?6 q3 v9 l7 Q __HAL_I2C_RESET_CR2();! a _$ d& O2 t# a+ X# I/ l/ m }4 y3 P7 m$ \0 H9 o" o( K void/ t. ^) y$ \0 m" `7 U v3 F& e2 { D I2C_Master_Receive(uint8_t DevAddress, uint8_t eerom_start_address,# [. V* j# @4 ?# W( k9 N uint8_t * pData, uint16_t Size1 X& M* @( X8 h0 U/ \/ M ) { uint32_t sizetmp; if ((pData == NULL) || (Size == 0)) {$ x, c, ~- q; { return; } ' }1 j! W5 o' w( v- U" ^ while (__HAL_I2C_GET_FLAG(I2C_ISR_BUSY)) { }4 e: N# z& Q; | /* Send Slave Address */( E; b6 A5 W ^7 f! M- |6 \ /* Set NBYTES to write and reload if size > I2C_MAX_BYTES and generate RESTART */ /* Size > I2C_MAX_BYTES, need to set RELOAD bit */ ! T; a! `6 A9 c7 e3 { I2C_TransferConfig(DevAddress, 1, I2C_CR2_AUTOEND, I2C_GENERATE_START_WRITE); while (!__HAL_I2C_GET_FLAG(I2C_ISR_TXIS)) {% V* p( l; j: R% E }' T, ~+ O+ E4 F# k# g I2C_CHANNEL->TXDR = eerom_start_address;/ G+ n( G* K" F# R if (Size > I2C_MAX_BYTES) {) \0 e% c! b' [* H, L6 m9 n I2C_TransferConfig(DevAddress, I2C_MAX_BYTES, I2C_CR2_RELOAD, I2C_GENERATE_START_READ);! c( _9 h+ [! A sizetmp = I2C_MAX_BYTES; }. v. F# G3 R, s0 F else B5 V+ O; Y. f/ T) i- C+ M' J7 A {) g7 |9 m0 h& E y3 S I2C_TransferConfig(DevAddress, Size, I2C_CR2_AUTOEND, I2C_GENERATE_START_READ);% b/ T( q. c1 ? b: v sizetmp = Size;$ R9 B' |; {3 I( x J } ' W" z! |$ f/ `) o m, g* d1 X: M E while (Size > 0)# R! Z4 L) n! m7 V {( E5 V* Q0 u7 _ /* Wait until RXNE flag is set */3 u" ?2 C- }8 v, @( ]9 B; m while (!__HAL_I2C_GET_FLAG(I2C_ISR_RXNE)) {/ s$ K# [$ l! X$ x$ C$ O% ~ } % F: w# l! a! R* ` /* Write data to RXDR */( \7 Q0 q/ m1 P" S1 \3 h *pData = (uint8_t)I2C_CHANNEL->RXDR;; h( W$ p) k" s2 ]4 B" L: K pData++;- C% [! b& S0 S! ? sizetmp--;2 `2 k( P+ o# _+ x Size--; if ((sizetmp == 0) && (Size != 0)) {" {6 W2 ~: J, O( V1 K N( A /* Wait until TCR flag is set */: X9 V( `8 h5 J: ] while (!__HAL_I2C_GET_FLAG(I2C_ISR_TCR))/ z% F- [% w! C {) F2 v! [; l: Y( h" z3 O' N9 y- ~ } if (Size > I2C_MAX_BYTES) {. a Z) F) _- L' Y9 o! S5 V I2C_TransferConfig(DevAddress, I2C_MAX_BYTES, I2C_CR2_RELOAD, I2C_NO_STARTSTOP); sizetmp = I2C_MAX_BYTES;" F9 A0 }* D7 T% z- i0 T }0 V4 Q% n7 {* F6 g# x. R" s else { I2C_TransferConfig(DevAddress, Size, I2C_CR2_AUTOEND, I2C_NO_STARTSTOP); sizetmp = Size; }: f8 I3 R* [; g0 D, A K }! T0 h' H/ G! o( n }! p$ i' X" b# S+ @ /* No need to Check TC flag, with AUTOEND mode the stop is automatically generated */: l- P' g; y* n2 _. U /* Wait until STOPF flag is set */ ?: ?9 F: F1 O5 q while (!__HAL_I2C_GET_FLAG(I2C_ISR_STOPF)) {9 w4 z U+ h7 \ }' J5 [8 O* q8 X9 @4 [& b /* Clear STOP Flag */ __HAL_I2C_CLEAR_FLAG(I2C_ISR_STOPF);! R& }' k9 l! X4 J% w8 l7 f /* Clear Configuration Register 2 */ __HAL_I2C_RESET_CR2();* W+ h6 Z' P) e; s6 M, v } |
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GPIO_I2CSCLInitial(void)+ s. @/ t6 _4 A
{
/* Enable the peripheral clock of GPIOB */
RCC->IOPENR |= RCC_IOPENR_I2CEN;
I2C_PORT->PUPDR = (I2C_PORT->PUPDR & ~GPIO_PUPDR_PUPD_SCL); /* (1) */
I2C_PORT->OTYPER |= GPIO_OTYPER_OT_SCL; /* (2) */& M0 C" x& E. }
#if (I2C_SCL_PIN < AFR_MAX_PINNUMBER)8 P) o0 x1 k# ~* d, b
{6 C, Q3 I! P5 D$ X5 m
I2C_PORT->AFR[0] |= (SCL_ALTERNATE_NUMBER << (I2C_SCL_PIN * 4)); /* (5) */2 |$ L6 R. L# b+ ]# F0 w
}
#else
{3 @% J/ H* Y- k
I2C_PORT->AFR[1] |= (SCL_ALTERNATE_NUMBER << ((I2C_SCL_PIN - AFR_MAX_PINNUMBER) * 4)); /* (5) */1 W! A {) C7 `3 s0 ~ t$ }" t# {
}. m) u, a0 y. F* L+ z
#endif: |# J/ ^- h# y* {, k6 f3 W
I2C_PORT->MODER = (I2C_PORT->MODER & ~GPIO_MODER_MODE_SCL) | GPIO_MODER_MODE_SCL_1;" t/ r! o: p' }! L/ G3 F7 b+ F+ M3 P
}
GPIO_I2CSDAInitial(void)1 i2 `1 C4 g3 ~* \
{
/* Enable the peripheral clock of GPIOB */
RCC->IOPENR |= RCC_IOPENR_I2CEN;
" d: h, ~0 w/ l% i7 M3 Z* @/ q
/* (1) PU for I2C signals */
/* (2) open drain for I2C signals */
/* (3) AF1 for I2C signals */
/* (4) Select AF mode on PB and PB */
I2C_PORT->PUPDR = (I2C_PORT->PUPDR & ~GPIO_PUPDR_PUPD_SDA); /* (1) */1 p$ q3 L! Y0 n' p4 H
I2C_PORT->OTYPER |= GPIO_OTYPER_OT_SDA; /* (2) */
#if (I2C_SDA_PIN < AFR_MAX_PINNUMBER)
{# }" _2 |0 t2 L, R# X/ f
I2C_PORT->AFR[0] |= (SDA_ALTERNATE_NUMBER << (I2C_SDA_PIN * 4)); /* (5) */
}
#else
{# n, x1 x1 X: u* z
I2C_PORT->AFR[1] |= (SDA_ALTERNATE_NUMBER << ((I2C_SDA_PIN - AFR_MAX_PINNUMBER) * 4)); /* (5) */6 L& a4 R8 n, J- C4 {' f- v7 m" v
}
#endif7 z, S8 d1 s8 O# l2 o6 H
I2C_PORT->MODER = (I2C_PORT->MODER & ~GPIO_MODER_MODE_SDA) | GPIO_MODER_MODE_SDA_1; /* (4) */( |7 H: w% r% N, W& {1 H, p
}