之前要做一个电量计，采用INA219电流检测芯片，参考了网上大神的代码后发现在STM32上可用，移植到STM8后不可用，后来找到了官方的示例demo，综合网上大神代码调试后成功驱动，测电流、电压、功率，精确度很高。

现在分享出来供大家参考，直接贴代码：

main.c

1. int main(void)
   ( ]3 o9 `' [0 p0 G# k/ j
2. {
     G' i0 N: \9 T$ Q' f2 F# t
3.     ina219_init();
   * h- M, p# A; H/ K/ G8 {& ]
4.    
   
5.     while(1)
   
6.    {  
   : W/ R+ c5 H& w1 G3 M. Y- _! @0 ]6 }
7.         //根据具体需求调用检测电流电压的函数
   
8.    }  
   
9. }

复制代码

/ K4 g3 ]8 i" n4 r3 A

ina219.c

1. #include "ina219.h"
   
2. 
   
3. u8  ina219_busVolt_LSB_mV = 4;   // Bus Voltage LSB value = 4mV
   8 C  l5 f9 G/ h" j
4. u8  ina219_shuntVolt_LSB_uV = 10;  // Shunt Voltage LSB value = 10uV
   
5. unsigned short ina219_calValue = 0;
   
6. 
   " E/ S, w: G8 `% P( C4 \+ E
7. u32 ina219_current_LSB_uA;
   - A: \5 [. n, b  \) A
8. u32 ina219_power_LSB_mW;
   
9. 
   0 u" o& a( m2 G# e
10. INA219_DATA ina219_data;
    
11. 
    
12. void INA_SCL_OUT(void)
    
13. {
    9 H7 k# k% u+ \0 _, R0 a7 z; _4 o  Y
14.     GPIO_InitTypeDef  GPIO_InitStructure;
    * h* p. k* ?* _, R2 u
15. 
    
16.     RCC_APB2PeriphClockCmd(INA219_I2C_GPIO_CLOCK, ENABLE);
    $ {2 W: U8 d$ s8 G
17.    
    # _. Z) M* X) V* n* k5 D1 z. m
18.     /* Configure I2C1 pins: PB12->SCL->OUT */
    
19.     GPIO_InitStructure.GPIO_Pin = INA219_I2C_SCL_PIN;
    ) R, |- V  p! }& [
20.     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    
21.     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    8 g0 B7 C! U7 F5 W/ @9 Z" ~
22.     GPIO_Init(INA219_I2C_PORT, &GPIO_InitStructure);
    
23.     GPIO_SetBits(INA219_I2C_PORT, INA219_I2C_SCL_PIN);
    
24. }
    
25. 
    
26. void INA_SDA_OUT(void)
    
27. {
    
28.     GPIO_InitTypeDef  GPIO_InitStructure;
    1 X  P; \8 l0 \5 }% A
29. 
    
30.     RCC_APB2PeriphClockCmd(INA219_I2C_GPIO_CLOCK, ENABLE);
    
31.    
    
32.     /* Configure I2C1 pins: PB14->SDA-OUT */
    
33.     GPIO_InitStructure.GPIO_Pin = INA219_I2C_SDA_PIN;
    9 h' g9 x3 O7 c5 T& b
34.     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    
35.     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    
36.     GPIO_Init(INA219_I2C_PORT, &GPIO_InitStructure);
    
37.     GPIO_SetBits(INA219_I2C_PORT, INA219_I2C_SDA_PIN);
    $ _* R. p4 k7 O, U
38. }
    
39. 
    & A6 w& f* m" z8 ~6 m
40. void INA_SDA_IN(void)
    ' Q& `4 `1 k) [9 W' m0 @1 i
41. {
    2 x$ k! K- r- f4 ~
42.     GPIO_InitTypeDef  GPIO_InitStructure;
    3 O" N" T( a! C- [/ l1 l
43. 
    9 P* l; u4 p0 x
44.     RCC_APB2PeriphClockCmd(INA219_I2C_GPIO_CLOCK, ENABLE);
    7 f' Q* I5 Y% H+ U5 u& v
45.    
    
46.     /* Configure I2C1 pins: PB14->SDA-IN */
    
47.     GPIO_InitStructure.GPIO_Pin = INA219_I2C_SDA_PIN;
    * \6 n; Z& Z  _9 q
48.     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    
49.     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    & X5 }( r/ J7 c, p, W
50.     GPIO_Init(INA219_I2C_PORT, &GPIO_InitStructure);
    
51. }
    7 `8 }* B# j* }# |. ~0 ?5 R
52. 
    3 K1 O( h7 F9 \! X
53. void INA_IIC_Start(void)
    ! b  X5 X/ L; z; G
54. {
    
55.   INA_SDA_OUT();
    
56.   INA_SCL_OUT();
    / ~8 Z4 W6 W& p9 a
57.   
    
58.   INA_SDA_SET;
    2 E  m- ^, h( Y7 k! A
59.   INA_SCL_SET;
    
60.   INA_SDA_CLR;
    4 [+ n5 l0 L0 d9 P+ u  y' [4 u7 J. X
61.   INA_SCL_CLR;
    $ Q8 G$ k* _$ N- [
62. }
    
63. 
    
64. void INA_IIC_Stop(void)
    
65. {
    
66.     INA_SDA_OUT();
    2 g% k4 _! ^0 r
67. 
    0 c7 a1 _; e- I, k! T1 [1 k0 D# I
68.     INA_SDA_CLR;
    
69.     INA_SCL_SET;
    / d! R" Q" e) p: U% J) U
70.     INA_SDA_SET;
    7 T" U- o2 l* [$ E* m0 J" D
71. }
    8 {: c  ?! {& Z3 D, S7 d! ~
72. 
    
73. void INA_IIC_Set_Ack(unsigned char ack)
    + P8 D8 s% w# N7 o- M8 ~4 X
74. {
    ; y! A( ?% V* Y9 B  ]
75.     INA_SDA_OUT();
    
76.    
    
77.     if(ack)
    ' N; O0 e8 J7 g# P- V1 M9 e
78.     {
    % ~- u1 V0 J4 D! N5 k6 T
79.       INA_SDA_SET;
    ; b& Z+ L; _% \% Y
80.     }
    
81.     else
    0 i; I1 p/ \7 i& V, h# }
82.     {
    5 s4 V5 q1 w5 v7 ?7 @
83.       INA_SDA_CLR;
    
84.     }
    / {% v: j4 L. k8 v3 @
85.    
    : T+ W; [# G- n  R8 w! |$ |1 L
86.     INA_SCL_SET;
    
87.     INA_SCL_CLR;
    " s+ g. T( r' ?- ]5 A% x# _
88. }
    
89. 
    
90. unsigned char INA_IIC_Get_Ack(void)
    3 g( F: D4 u; O
91. {
    
92.     unsigned char ack;
    
93. 
    5 J( O& B9 l" f, O; {. k. n' {$ }
94.     INA_SDA_IN();
    " D4 d5 g9 G$ C3 z7 n* L- p
95.     INA_SDA_SET;
    
96.     INA_SCL_SET;
    , u& M) f" p& U4 I2 c0 H" e( ?2 w
97.     if(INA_SDA_TST)
    1 A" n1 ], S$ T( b3 ]
98.     {
    ' R; `5 L! L' C, H: \( ?
99.       ack = 1;
    
100.     }
     
101.     else
     ' D: I1 z$ x6 C. ^
102.     {
     / u/ L' E( c+ o5 n. U6 u
103.       ack = 0;
     9 }) A$ I3 K5 w( s- @, I/ x
104.     }
     
105.    
     : {( w' a  E+ B4 |. |! l1 g  Q
106.     INA_SCL_CLR;
     : M( p! v8 }3 K
107. 
     
108.     return(ack);
     " J1 m, ~. v+ T# A% C1 a# ^
109. }
     4 q. x3 M/ d0 T4 i) x
110. 
     - M5 r; b" K8 W. Y
111. void INA_IIC_Write_8bits(unsigned char dat)
     ( Q3 m$ H$ ?3 H( W4 [3 p) w$ T& u
112. {
     + t& ]+ C: V) N$ X2 p+ i. H5 }
113.   unsigned char i;
     0 S- V6 e) H, N; _
114.   
     : K+ o. B: c. `- N- x
115.   INA_SDA_OUT();
     
116.   for(i = 8; i; i--)
     
117.   {
     
118.     if(dat & 0x80)
     - ?2 ?# I* G* k) t& i
119.     {
     ; B; U+ G  q/ s
120.       INA_SDA_SET;
     - j4 f( I% d2 u+ s' {* e  T" V
121.     }
     % ?' E( E9 g" y* h9 ^
122.     else
     
123.     {
     ( i, w2 U: F: _0 x5 S# b! D
124.       INA_SDA_CLR;
     ! \4 [( W' R! G) _! v- H' {6 E
125.     }
     5 E. G) p& H& g' P2 f; G# d: l9 a
126.    
     
127.     INA_SCL_SET;
     
128.     dat <<= 1;
     
129.     INA_SCL_CLR;
     
130.   }
     
131. }
     
132. 
     # Q; ^9 Z: [- X8 n- {' I* Q
133. unsigned char INA_IIC_Read_8bits(void)
     
134. {
     # g4 X- [8 e4 m& C' z' m6 |; @
135.     unsigned char i, dat;
     ( y3 A- U4 R8 F) G' K
136. 
     
137.     INA_SDA_IN();
     
138.     INA_SDA_SET;
     6 E, ^8 ^! e) T$ [8 s( F# e
139.     dat = 0;
     
140.     for(i = 8; i; i--)
     & E0 c7 r6 E; T% O
141.     {
     
142.         INA_SCL_SET;
     
143.         dat <<= 1;
     : Z7 e4 R8 h* b2 [/ j
144.         if(INA_SDA_TST)
     + l# P$ M* m$ f
145.           dat++;
     
146.         INA_SCL_CLR;
     
147.     }
     7 `* l1 j9 ]( w5 Q1 e9 M" ~/ _% ]
148.    
     
149.     return(dat);
     6 j# e+ }( a8 U8 i5 u  m
150. }
     * q0 D" X9 r. R9 k1 ?  _- T& n
151. 
     
152. void INA_IIC_Write_Byte(unsigned char reg, unsigned char dat)
     0 _9 g. t" j) `1 k4 Q( C" k
153. {
     4 s1 b# Q: g  g0 m
154.   unsigned char dev = INA219_I2C_ADDRESS;
     
155.   
     # k. l4 V% |0 O* x5 l& v. u+ L) M
156.   INA_IIC_Start();
     " A3 Y- u# U; I# [% {/ F
157.   
     9 I- T, F8 k& r; k& |# N
158.   //  dev &= ~0x01;
     
159.   INA_IIC_Write_8bits(dev);
     
160.   INA_IIC_Get_Ack();
     ' T+ v6 d/ F; ~4 o" c+ C
161.   
     
162.   INA_IIC_Write_8bits(reg);
     % e" O1 _- i+ ~4 [
163.   INA_IIC_Get_Ack();
     
164.   
     % U0 `. N! q3 Z) R
165.   INA_IIC_Write_8bits(dat);
     6 s  W- h2 I% g9 f, ~1 Q4 X
166.   INA_IIC_Get_Ack();
     
167.   
     ) K& x: A" @! Z
168.   INA_IIC_Stop();
     
169. }
     ) z! g6 |- i2 j, C: ]' g) W0 u6 ]7 j
170. 
     
171. unsigned char INA_IIC_Read_Byte(unsigned char reg)
     
172. {
     7 \& W$ |& H% H  d- n! x0 y
173.   unsigned char dat;
     
174.   unsigned char dev = INA219_I2C_ADDRESS;
     ; H$ S! b- v) ?9 I
175.   
     ' l- Z( ]# D/ T( b
176.   INA_IIC_Start();
     ' p8 u) J' b0 A) ^/ G- U
177.   
     
178.   //  dev &= ~0x01;
     2 [( Y% i, b" {% t$ l9 M) G( \$ E
179.   INA_IIC_Write_8bits(dev);
     
180.   INA_IIC_Get_Ack();
     , \. F: G, r  ]
181.   
     
182.   INA_IIC_Write_8bits(reg);
     
183.   INA_IIC_Get_Ack();
     
184.   
     
185.   INA_IIC_Start();
     
186.   
     ! B" p+ Q- A5 U+ q4 J
187.   dev |= 0x01;
     
188.   INA_IIC_Write_8bits(dev);
     " A; u% J: H4 M6 L+ z+ \4 e* r
189.   INA_IIC_Get_Ack();
     
190.   
     
191.   dat = INA_IIC_Read_8bits();
     & b% {8 }$ ?' l
192.   INA_IIC_Set_Ack(1);
     ' P  q3 `& a" z3 [
193.   
     
194.   INA_IIC_Stop();
     
195.   
     " e# E4 L; Z! x1 R2 A
196.   return (dat);
     
197. }
     
198. 
     
199. void INA_IIC_Write_Bytes(unsigned char reg, unsigned char *dat, unsigned char num)
     
200. {
     
201.   unsigned char dev = INA219_I2C_ADDRESS;
     
202.   
       ?: D* W" a$ q
203.   INA_IIC_Start();
     3 l3 q/ J; f3 A% w# Z
204.   
     
205.   //  dev &= ~0x01;
     ( t, M, D+ w8 i# a
206.   INA_IIC_Write_8bits(dev);
       a$ K0 j! }$ g) k9 {4 `  R3 _
207.   INA_IIC_Get_Ack();
     
208.   
     
209.   INA_IIC_Write_8bits(reg);
     
210.   INA_IIC_Get_Ack();
     
211.   
     4 V+ S0 C3 `& Q' u5 z4 F
212.   while(num--)
     
213.   {
     8 h+ ?; K0 Z' {3 I
214.     INA_IIC_Write_8bits(*dat);
     
215.     INA_IIC_Get_Ack();
     8 a, z6 [6 @; R0 U, j
216.     dat++;
     
217.   }
     1 q0 o! r$ E/ `/ h! o' K
218.   
     1 n6 |' L$ H4 ~" A" P* O
219.   INA_IIC_Stop();
     
220. }
     
221. 
     ! q3 x, ?; V7 [7 {; K. n. n0 a
222. void INA_IIC_Read_Bytes(unsigned char reg, unsigned char *dat, unsigned char num)
     
223. {
     
224.   unsigned char *tmp = dat;
     * e& {9 c& l) t  u7 n$ R
225.   unsigned char dev = INA219_I2C_ADDRESS;
     & J) A) H4 H% h& J
226.   
     * y& ]7 H- {% X3 s2 f* g2 R
227.   INA_IIC_Start();
     % g0 Z$ f; w! f, Z% [
228.   
     + g' B- E) o! ^0 a# Q0 ]
229.   //  dev &= ~0x01;
     4 D; V2 O7 t  {6 J1 Y
230.   INA_IIC_Write_8bits(dev);
     ' k2 s: v* ?( F, s- {2 a
231.   INA_IIC_Get_Ack();
     
232.   
     ! X( b/ I; t8 R
233.   INA_IIC_Write_8bits(reg);
     
234.   INA_IIC_Get_Ack();
     & L( ?) w3 G% Z% D! D- s! m  H
235.   
     
236.   INA_IIC_Start();
     
237.   
     & X, @% {# `" E; }0 C. b
238.   dev |= 0x01;
     5 c, r  z" X- M/ [) i
239.   INA_IIC_Write_8bits(dev);
     
240.   INA_IIC_Get_Ack();
       _4 o3 l- n7 x" }6 S- L6 U2 ^
241.   
     
242.   while(num--)
     , q* n3 H$ m- k9 b
243.   {
     ( k) P. H$ K5 g$ \  M
244.     *tmp = INA_IIC_Read_8bits();
     
245.     if(num == 0)
     ' }' \' `6 F; o% g
246.       INA_IIC_Set_Ack(1);
     
247.     else
     7 c  a; |0 d5 b# y+ D
248.       INA_IIC_Set_Ack(0);
     
249.     tmp++;
     - I$ @, H1 T" z  G/ I9 J
250.   }
     + u' C6 ]5 {) A; ^
251.   
     : ^$ ~, P# l! k- E" ?6 J) Y
252.   INA_IIC_Stop();
     
253. }
     8 ]0 i; |: R( r( _. ?3 s
254. 
     
255. void ina219_Write_Register(unsigned char reg, unsigned int dat)
     
256. {
     ' {# u$ `/ D0 N/ A% X9 N$ U7 n# b' [
257.     unsigned char val[2];
     $ m; l3 K; }# B5 G
258.    
     
259.     val[0] = (unsigned char)(dat >> 8);
     . s( h: ]% ?6 R# z1 M8 x
260.     val[1] = (unsigned char)(dat & 0xFF);
     
261.     INA_IIC_Write_Bytes(reg, val, 2);
     
262. }
     , U) \4 W3 M$ u7 s
263. 
       R! F% C, _7 R% l) j: v
264. void ina219_Read_Register(unsigned char reg, signed short *dat)
     
265. {
     3 v3 H" L4 ~3 a: [
266.     //printf("read reg == %d\r\n",reg);
     ' X+ v% H: s& B1 y) }' u& k
267.   unsigned char val[2];
     
268.   
     
269.   INA_IIC_Read_Bytes(reg, val, 2);
     + U1 q  K2 s- _  E
270.   *dat = ((unsigned int)(val[0]) << 8) + val[1];
     
271.   
     
272.     //printf("data1 == %x\r\n",val[0]);
     0 \$ f0 N! p' }+ r
273.     //printf("data2 == %x\r\n",val[1]);
     ) k! _- D9 @& z* F4 }1 d
274.    
     
275. }
     
276. 
     
277. // INA219 Set Calibration 16V/16A(Max) 0.02¦¸
     
278. void ina219_SetCalibration_16V_16A(void)
     
279. {
     
280.   u16 configValue;
     2 Z" }3 o# o7 D1 l* P
281.   
     : O1 v( U- `1 w  z4 P0 `
282.   // By default we use a pretty huge range for the input voltage,
       c5 A5 U; @/ I8 w) E% }3 \
283.   // which probably isn't the most appropriate choice for system
     
284.   // that don't use a lot of power.  But all of the calculations
     ! h. D0 `" I, C  |
285.   // are shown below if you want to change the settings.  You will
     . S6 }) w, D; {  c
286.   // also need to change any relevant register settings, such as
       G# @& u2 j" H2 l8 l
287.   // setting the VBUS_MAX to 16V instead of 32V, etc.
     
288.   
     
289.   // VBUS_MAX     = 16V   (Assumes 16V, can also be set to 32V)
     
290.   // VSHUNT_MAX   = 0.32  (Assumes Gain 8, 320mV, can also be 0.16, 0.08, 0.04)
     
291.   // RSHUNT       = 0.02   (Resistor value in ohms)
     , F7 |7 v1 g/ I
292.   
     
293.   // 1. Determine max possible current
     
294.   // MaxPossible_I = VSHUNT_MAX / RSHUNT
     & g$ C% E) c( w) ^( L
295.   // MaxPossible_I = 16A
     
296.   
     ' D, q3 c& r' i  V
297.   // 2. Determine max expected current
     
298.   // MaxExpected_I = 16A
     
299.   
     
300.   // 3. Calculate possible range of LSBs (Min = 15-bit, Max = 12-bit)
     
301.   // MinimumLSB = MaxExpected_I/32767
       Y' ]% I3 H# ^5 e) a$ x6 S
302.   // MinimumLSB = 0.00048            (0.48mA per bit)
     8 a9 d1 }$ F6 d: p$ H! }" U' K
303.   // MaximumLSB = MaxExpected_I/4096
     
304.   // MaximumLSB = 0,00390            (3.9mA per bit)
     . s3 h5 c0 |. X4 @4 i. |
305.   
     
306.   // 4. Choose an LSB between the min and max values
     4 {) B) }1 l, y/ Z1 ^0 |# l3 K! t
307.   //    (Preferrably a roundish number close to MinLSB)
     0 p" ^8 E$ d% n# |8 K
308.   // CurrentLSB = 0.00050            (500uA per bit)
     ' w+ D7 t; Z6 D+ J9 A+ S. d: Z7 N
309.   
     
310.   // 5. Compute the calibration register
     
311.   // Cal = trunc (0.04096 / (Current_LSB * RSHUNT))
     " C% n- ~/ q, Z0 u* j1 u  O1 t
312.   // Cal = 4096 (0x1000)
     
313.   
     " i9 R) D& C4 Z) h1 g
314.   ina219_calValue = 0x1000;
     3 H; r& v3 d  e
315.   
     
316.   // 6. Calculate the power LSB
     
317.   // PowerLSB = 20 * CurrentLSB
     
318.   // PowerLSB = 0.01 (10mW per bit)
     
319.   
     7 g  a7 d, g& f, y+ {' ?$ _/ R
320.   // 7. Compute the maximum current and shunt voltage values before overflow
     
321.   //
     
322.   // Max_Current = Current_LSB * 32767
     
323.   // Max_Current = 16.3835A before overflow
     
324.   //
     5 ^9 U  t2 b9 }
325.   // If Max_Current > Max_Possible_I then
     * ~0 ~9 M1 F% j6 J
326.   //    Max_Current_Before_Overflow = MaxPossible_I
     3 m+ ~0 y1 H" M( Y# j
327.   // Else
     
328.   //    Max_Current_Before_Overflow = Max_Current
     
329.   // End If
     
330.   //
     ' f- x% X+ ~0 k( ]8 }
331.   // Max_ShuntVoltage = Max_Current_Before_Overflow * RSHUNT
     " H# z  q+ w# b$ d' G" `
332.   // Max_ShuntVoltage = 0.32V
     0 g5 c* y; n6 L% D
333.   //
     
334.   // If Max_ShuntVoltage >= VSHUNT_MAX
     
335.   //    Max_ShuntVoltage_Before_Overflow = VSHUNT_MAX
     . r2 K& k2 L/ t4 ^% E0 M! }6 j
336.   // Else
     
337.   //    Max_ShuntVoltage_Before_Overflow = Max_ShuntVoltage
     * }1 W3 [" j" {, o3 L
338.   // End If
     / ~1 z8 j2 f& m7 E1 n
339.   
     
340.   // 8. Compute the Maximum Power
     5 y; j/ q$ m1 i+ u7 l
341.   // MaximumPower = Max_Current_Before_Overflow * VBUS_MAX
     ( H' p  N4 r( j' a6 Z' f
342.   // MaximumPower = 1.6 * 16V
     
343.   // MaximumPower = 256W
     ! p% x+ h& t$ {( Z( {9 j6 z6 ?8 Q
344.   
     
345.   // Set multipliers to convert raw current/power values
     
346.   ina219_current_LSB_uA = 500;     // Current LSB = 500uA per bit
     
347.   ina219_power_LSB_mW = 10;        // Power LSB = 10mW per bit = 20 * Current LSB
     
348.   
     
349.   // Set Calibration register to 'Cal' calculated above
     % h: e2 m$ ~- c/ B) c# U
350.   ina219_Write_Register(INA219_REG_CALIBRATION, ina219_calValue);
     
351.   
     
352.   // Set Config register to take into account the settings above
     
353.   configValue = ( INA219_CFG_BVOLT_RANGE_16V | INA219_CFG_SVOLT_RANGE_320MV | INA219_CFG_BADCRES_12BIT_16S_8MS | INA219_CFG_SADCRES_12BIT_16S_8MS | INA219_CFG_MODE_SANDBVOLT_CONTINUOUS );
     
354.   
     & t- j4 m9 \2 n6 L# s
355.   ina219_Write_Register(INA219_REG_CONFIG, configValue);
     
356. }
     
357. 
     + Z! a( O7 ]( H6 B# Q
358. void ina219_configureRegisters(void)
       N( E0 H6 j4 Q' ~1 M3 X! c
359. {
     ' ~: i) s) T6 a1 s/ r
360.   DelayMs(15);
     3 x- {/ x1 W' `* P. n. J
361.   
     , B' x; ~4 u, T! ]2 H$ p3 g5 N
362.   ina219_SetCalibration_16V_16A();
     1 Z$ a) K# G( L; p! r
363. }
     : F+ s& \- F% o. b3 p& X  ^
364. 
     ; W% U& _' \9 l; H0 I9 L
365. void ina219_gpio_init(void)
     + ^; R$ J" s" N8 ?6 q6 }  B
366. {
     
367.     INA_SCL_OUT();
     
368.     INA_SDA_OUT();
     
369. }
     
370. 
     
371. void ina219_init(void)
     
372. {
     
373.   ina219_gpio_init();
     
374.   
     
375.   ina219_configureRegisters();
     ! ^/ V# X/ n  S, A2 [. x
376. }
     , w4 h4 b3 {/ c' ^, d, d
377. 
     , h( O7 {, b& b. A5 D
378. 
     
379. /* ÕâÀïÒÔÉÏÊdzõʼ»¯º¯Êý */
     
380. /* ´ÓÕâÀïÍùÏÂÊǹ¦Äܺ¯Êý */
     
381. 
     
382. 
     ) i6 C. m3 q! U3 U) r3 {, O9 L
383. signed short ina219_GetBusVoltage_raw(void)
     
384. {
     
385.   signed short val;
     
386.   
     ) U6 r" |. a. }- g0 z5 R6 }* C
387.   ina219_Read_Register(INA219_REG_BUSVOLTAGE, &val);
     
388.   val >>= 3;                      // Shift to the right 3 to drop CNVR and OVF
     / @+ H2 W7 c+ ^
389.   
     / S) _" E4 C9 E' n* @( F+ f
390.   return (val);
     ( w2 K1 E; b* L+ x
391. }
     
392. 
     # S) r: S# v' a' Y" o
393. signed short ina219_GetCurrent_raw(void)
     2 h. C0 |7 K: a, @6 X' J
394. {
     
395.   signed short val;
     
396.   
     : f: F: W  B5 m* z& Y2 y" Y
397.   // Sometimes a sharp load will reset the INA219, which will
     
398.   // reset the cal register, meaning CURRENT and POWER will
     
399.   // not be available ... avoid this by always setting a cal
       X9 g) G3 A' q: G
400.   // value even if it's an unfortunate extra step
     
401.   ina219_Write_Register(INA219_REG_CALIBRATION, ina219_calValue);
     . C, Z, G9 R2 q
402.   
     ! t* p, J% X+ d
403.   // Now we can safely read the CURRENT register!
     # h, ?3 w1 ?, c- n& h
404.   ina219_Read_Register(INA219_REG_CURRENT, &val);
     
405.   
     ; p) Z  X/ c; Z' S% h1 s
406.   return (val);
     " B/ z2 v/ [# A: N
407. }
     + Y! Z' j- c8 O3 E
408. 
     7 d% s8 U, c0 n4 n' s0 U" C, N
409. 
     
410. signed short ina219_GetBusVoltage_mV(void)
     . ]3 s2 d/ Y& J, h
411. {
     & l4 q& L$ S2 t, l- {4 y: g
412.   signed short val;
     
413.   
     
414.   ina219_Read_Register(INA219_REG_BUSVOLTAGE, &val);
     $ F7 P% r/ Q/ T4 l; F" P' q$ r
415.   val >>= 3;                      // Shift to the right 3 to drop CNVR and OVF
     % I! E- N. j- |) Q% T$ L
416.   val *= ina219_busVolt_LSB_mV;   // multiply by LSB(4mV)
     # s% S& p" a; @: y/ x8 o4 P2 _7 j
417.   
     # b  [# Q, V2 r2 X1 j8 E. v2 O; d
418.   return (val);
     
419. }
     
420. 
     , e+ n. n% q! t
421. s32 ina219_GetShuntVoltage_uV(void)
     4 M0 }* H' F2 o- V. b
422. {
     
423.   s32 val;
     % Z/ x3 |3 N* Q& \# C
424.   s16 reg;
     $ q* y$ P  r4 V
425.   
     
426.   ina219_Read_Register(INA219_REG_SHUNTVOLTAGE, ®);
     
427.   val = (s32)reg * ina219_shuntVolt_LSB_uV;   // multiply by LSB(10uV)
     
428.   
     
429.   return (val);
       ~8 S2 h+ g9 J$ u" w" G! f
430. }
     & C7 {4 P4 _* S
431. 
     
432. s32 ina219_GetCurrent_uA(void)
     
433. {
     
434.   s32 val;
     " ?$ X, T' d1 R2 Q; m5 q- G
435.   s16 reg;
     : g! T4 z# y% z6 P& f4 o1 o) k
436.   
     
437.   // Sometimes a sharp load will reset the INA219, which will
     2 ~! Y* A& `* b- M7 K/ [3 Y
438.   // reset the cal register, meaning CURRENT and POWER will
     
439.   // not be available ... avoid this by always setting a cal
     0 |3 g( D. [7 i$ H, a0 e3 b
440.   // value even if it's an unfortunate extra step
     
441.   ina219_Write_Register(INA219_REG_CALIBRATION, ina219_calValue);
     # v+ C6 D& Y/ H: t5 D) o
442.   
     
443.   // Now we can safely read the CURRENT register!
     
444.   ina219_Read_Register(INA219_REG_CURRENT, ®);
     # f6 U1 Q5 L2 N. ~
445.   
     
446.   val = (s32)reg * ina219_current_LSB_uA;
     % J2 N9 o, s. W( ?; ^
447.   
     ' k$ }7 X  s- F' L- T. J' s3 a) ?- A
448.   return (val);
     # L: t$ |* p% Q+ j! T/ W
449. }
     
450. 
     
451. s32 ina219_GetPower_mW(void)
     
452. {
     ) T6 O6 i; [* {  X1 m
453.   s32 val;
     
454.   s16 reg;
     6 G# ^  ?6 v7 V' i2 G; a) {
455.   
     
456.   // Sometimes a sharp load will reset the INA219, which will
     
457.   // reset the cal register, meaning CURRENT and POWER will
     
458.   // not be available ... avoid this by always setting a cal
     2 J. H) V* I% u% ~& l# Y
459.   // value even if it's an unfortunate extra step
     
460.   ina219_Write_Register(INA219_REG_CALIBRATION, ina219_calValue);
     1 {& ]: _4 n  P% S  u$ t
461.   
     ( Z& G$ _/ ]2 r
462.   // Now we can safely read the POWER register!
     
463.   ina219_Read_Register(INA219_REG_POWER, ®);
     0 m" [& x6 ~" W5 j( [  M
464.   
     
465.   val = (s32)reg * ina219_power_LSB_mW;
     & f6 O% W  `& r3 W' t" ?/ G+ [8 q
466.   
     * h0 K+ U7 ]! ^6 T& j' M2 V6 A
467.   return (val);
     / F7 G# ]* s, y2 C4 H. u6 [
468. }
     7 _6 Q; S$ S; N# V+ i7 y  A7 K) p
469. 
     
470. void INA_Process(void)
     * g" ?7 v5 O4 k3 Z1 N9 M1 x
471. {
     4 n+ t* f- m$ U$ q$ Y" b: T$ G
472.     if(INA219process_flag == Open)
     $ k2 n0 x0 ]6 }8 ?- W4 A( _8 h2 [9 k
473.     {
     
474.         INA219process_flag = Close;
     # `5 n. g  f9 g& A% q
475.         
     9 V! B2 L6 M( r5 s. u5 A
476.         ina219_data.voltage_ina219 = ina219_GetBusVoltage_mV();
     
477.         printf("voltage_ina219 is %d\r\n",ina219_data.voltage_ina219);
     
478.         
     
479.         ina219_data.shunt_ina219 = ina219_GetShuntVoltage_uV();
     
480.         printf("shunt_ina219 is %ld\r\n",ina219_data.shunt_ina219);
     
481.         
     9 L) f$ i9 C0 m
482.             
     
483.         ina219_data.current_ina219 = ina219_GetCurrent_uA();
     . B# A) @! x. j% u& T$ u5 Y
484.         printf("current_ina219 is %ld\r\n",ina219_data.current_ina219);
     3 h6 z! C/ d- U( q8 d/ H; e
485.         
     
486.         ina219_data.power_ina219 = ina219_GetPower_mW();
     
487.         printf("power_ina219 is %ld\r\n",ina219_data.power_ina219);
     
488.     }
     
489. }

复制代码

ina219.h

1. #ifndef __INA219_H
   
2. #define __INA219_H
   
3. #include "main.h"
   ' d* V  M5 z  D5 X6 G, u
4. 
   9 J! N5 a. e" C1 @" x% t! Y
5. #define INA219_I2C_PORT                        GPIOB
   
6. #define INA219_I2C_GPIO_CLOCK            RCC_APB2Periph_GPIOB
   
7. #define INA219_I2C_SCL_PIN                GPIO_Pin_12
   4 o/ O* }. `6 `( w* |! ?5 z, q' |
8. #define INA219_I2C_SDA_PIN                GPIO_Pin_14
   
9. 
   2 d  K1 I* _% J5 Q/ C! t  n( H
10. #define INA_SCL_SET     GPIO_SetBits(INA219_I2C_PORT,INA219_I2C_SCL_PIN)
    + P+ b7 O$ v1 P4 O
11. #define INA_SDA_SET     GPIO_SetBits(INA219_I2C_PORT, INA219_I2C_SDA_PIN)
    
12. 
    : B) f" K; \* N/ C) R" d
13. #define INA_SCL_CLR     GPIO_ResetBits(INA219_I2C_PORT,INA219_I2C_SCL_PIN)
    
14. #define INA_SDA_CLR     GPIO_ResetBits(INA219_I2C_PORT,INA219_I2C_SDA_PIN)
    3 z" s$ p  h) W+ k8 {9 v$ g
15. 
    
16. #define INA_SDA_TST     GPIO_ReadInputDataBit(INA219_I2C_PORT,INA219_I2C_SDA_PIN)
    
17. 
    
18. /*----------------------------------------------------------------------------*/
    
19. // I2C Address Options
    * v7 P  G: U  w2 ?5 t' ]) ^
20. #define INA219_I2C_ADDRESS_CONF_0               (u8)(0x40 << 1)     // A0 = GND, A1 = GND
      H5 \  m2 ~+ O2 i5 @
21. #define INA219_I2C_ADDRESS_CONF_1               (u8)(0x41 << 1)     // A0 = VS+, A1 = GND
    
22. #define INA219_I2C_ADDRESS_CONF_2               (u8)(0x42 << 1)     // A0 = SDA, A1 = GND
    2 g" k2 U: r$ p: F3 O
23. #define INA219_I2C_ADDRESS_CONF_3               (u8)(0x43 << 1)     // A0 = SCL, A1 = GND
      ?# ?" p8 @" M! d
24. #define INA219_I2C_ADDRESS_CONF_4               (u8)(0x44 << 1)     // A0 = GND, A1 = VS+
    
25. #define INA219_I2C_ADDRESS_CONF_5               (u8)(0x45 << 1)     // A0 = VS+, A1 = VS+
    9 s  h' q+ N9 U# c) d2 L6 B1 S
26. #define INA219_I2C_ADDRESS_CONF_6               (u8)(0x46 << 1)     // A0 = SDA, A1 = VS+
    . {# c1 |" T) y/ n
27. #define INA219_I2C_ADDRESS_CONF_7               (u8)(0x47 << 1)     // A0 = SCL, A1 = VS+
    
28. #define INA219_I2C_ADDRESS_CONF_8               (u8)(0x48 << 1)     // A0 = GND, A1 = SDA
    
29. #define INA219_I2C_ADDRESS_CONF_9               (u8)(0x49 << 1)     // A0 = VS+, A1 = SDA
    ; o& D( B' E5 G, s" O/ a. V
30. #define INA219_I2C_ADDRESS_CONF_A               (u8)(0x4A << 1)     // A0 = SDA, A1 = SDA
    7 z$ B) U" n7 F% n7 j9 X4 F0 x
31. #define INA219_I2C_ADDRESS_CONF_B               (u8)(0x4B << 1)     // A0 = SCL, A1 = SDA
    
32. #define INA219_I2C_ADDRESS_CONF_C               (u8)(0x4C << 1)     // A0 = GND, A1 = SCL
      U/ {9 y4 @+ ~
33. #define INA219_I2C_ADDRESS_CONF_D               (u8)(0x4D << 1)     // A0 = VS+, A1 = SCL
    ; M8 O0 P: E& V& @; x1 @
34. #define INA219_I2C_ADDRESS_CONF_E               (u8)(0x4E << 1)     // A0 = SDA, A1 = SCL
    
35. #define INA219_I2C_ADDRESS_CONF_F               (u8)(0x4F << 1)     // A0 = SCL, A1 = SCL
    
36. #define INA219_I2C_ADDRESS                      INA219_I2C_ADDRESS_CONF_0
    , `, U5 u8 C. T" j) w
37. 
    
38. 
    ' p1 B! C% k( l: v
39. /*----------------------------------------------------------------------------*/
    + {7 t0 U+ q: K& @+ \
40. // Register Addresses
    7 }) I7 F+ I1 g
41. #define INA219_REG_CONFIG                       (u8)(0x00)      // CONFIG REGISTER (R/W)
    7 V0 y5 ]6 O  T* D* W2 o! `: Q
42. #define INA219_REG_SHUNTVOLTAGE                 (u8)(0x01)      // SHUNT VOLTAGE REGISTER (R)
    
43. #define INA219_REG_BUSVOLTAGE                   (u8)(0x02)      // BUS VOLTAGE REGISTER (R)
    3 F1 ]( i; T/ @5 P( P% T( Z
44. #define INA219_REG_POWER                        (u8)(0x03)      // POWER REGISTER (R)
    4 _3 C9 V& e  F9 F. g6 J
45. #define INA219_REG_CURRENT                      (u8)(0x04)      // CURRENT REGISTER (R)
      q+ |8 K7 O5 Y6 h& {6 ?7 `, X9 F* D
46. #define INA219_REG_CALIBRATION                  (u8)(0x05)      // CALIBRATION REGISTER (R/W)
    
47. 
    
48. 
    
49. /*----------------------------------------------------------------------------*/
    
50. // Macros for assigning config bits
    
51. #define INA219_CFGB_RESET(x)                    (u16)((x & 0x01) << 15)     // Reset Bit
    
52. #define INA219_CFGB_BUSV_RANGE(x)               (u16)((x & 0x01) << 13)     // Bus Voltage Range
    ( Z$ E0 x! Y. \: b
53. #define INA219_CFGB_PGA_RANGE(x)                (u16)((x & 0x03) << 11)     // Shunt Voltage Range
    / k7 o2 Z7 J3 y( k" k* m0 U
54. #define INA219_CFGB_BADC_RES_AVG(x)             (u16)((x & 0x0F) << 7)      // Bus ADC Resolution/Averaging
    + d6 L" v* T3 P  }
55. #define INA219_CFGB_SADC_RES_AVG(x)             (u16)((x & 0x0F) << 3)      // Shunt ADC Resolution/Averaging
    , [$ ~0 Y% z5 H5 x
56. #define INA219_CFGB_MODE(x)                     (u16) (x & 0x07)            // Operating Mode
    
57. 
    . I" h1 o, }9 U) h% B" T8 [
58. 
    
59. /*----------------------------------------------------------------------------*/
    % P5 ^' x/ T) J  C+ @( ^
60. // Configuration Register
    ' v- I( h, M# t( t' g$ O1 z
61. #define INA219_CFG_RESET                        INA219_CFGB_RESET(1)            // Reset Bit
    5 z( [5 W5 d2 f% T' Y
62. 
    7 ]5 q+ v" [, Y) h6 I/ m' [0 D
63. #define INA219_CFG_BVOLT_RANGE_MASK             INA219_CFGB_BUSV_RANGE(1)       // Bus Voltage Range Mask
    ) ?$ x  j& r- o, A9 h) ^$ V9 p. d
64. #define INA219_CFG_BVOLT_RANGE_16V              INA219_CFGB_BUSV_RANGE(0)       // 0-16V Range
    
65. #define INA219_CFG_BVOLT_RANGE_32V              INA219_CFGB_BUSV_RANGE(1)       // 0-32V Range (default)
    
66. 
    6 k+ S- S$ q' F# ^! x7 I! m! I
67. #define INA219_CFG_SVOLT_RANGE_MASK             INA219_CFGB_PGA_RANGE(3)        // Shunt Voltage Range Mask
    7 V, H$ b' L2 m- e1 G" k
68. #define INA219_CFG_SVOLT_RANGE_40MV             INA219_CFGB_PGA_RANGE(0)        // Gain 1, 40mV Range
    
69. #define INA219_CFG_SVOLT_RANGE_80MV             INA219_CFGB_PGA_RANGE(1)        // Gain 2, 80mV Range
    0 J7 s+ T0 o) A* \+ g, H5 M
70. #define INA219_CFG_SVOLT_RANGE_160MV            INA219_CFGB_PGA_RANGE(2)        // Gain 4, 160mV Range
    , @" ?$ I% t# ^. u( Y' P* Q* @; A
71. #define INA219_CFG_SVOLT_RANGE_320MV            INA219_CFGB_PGA_RANGE(3)        // Gain 8, 320mV Range (default)
    
72. 
    " j8 \' J! c; S& U
73. #define INA219_CFG_BADCRES_MASK                 INA219_CFGB_BADC_RES_AVG(15)    // Bus ADC Resolution and Averaging Mask
    ' p/ ~; {1 j* P7 u+ t* I5 C/ H) l# i
74. #define INA219_CFG_BADCRES_9BIT_1S_84US         INA219_CFGB_BADC_RES_AVG(0)     // 1 x 9-bit Bus sample
    
75. #define INA219_CFG_BADCRES_10BIT_1S_148US       INA219_CFGB_BADC_RES_AVG(1)     // 1 x 10-bit Bus sample
    
76. #define INA219_CFG_BADCRES_11BIT_1S_276US       INA219_CFGB_BADC_RES_AVG(2)     // 1 x 11-bit Bus sample
    
77. #define INA219_CFG_BADCRES_12BIT_1S_532US       INA219_CFGB_BADC_RES_AVG(3)     // 1 x 12-bit Bus sample (default)
    
78. #define INA219_CFG_BADCRES_12BIT_2S_1MS         INA219_CFGB_BADC_RES_AVG(9)     // 2 x 12-bit Bus samples averaged together
    5 L* d" C* J5 F5 i
79. #define INA219_CFG_BADCRES_12BIT_4S_2MS         INA219_CFGB_BADC_RES_AVG(10)    // 4 x 12-bit Bus samples averaged together
    
80. #define INA219_CFG_BADCRES_12BIT_8S_4MS         INA219_CFGB_BADC_RES_AVG(11)    // 8 x 12-bit Bus samples averaged together
    
81. #define INA219_CFG_BADCRES_12BIT_16S_8MS        INA219_CFGB_BADC_RES_AVG(12)    // 16 x 12-bit Bus samples averaged together
    2 i+ D+ f; |+ ]0 _; c
82. #define INA219_CFG_BADCRES_12BIT_32S_17MS       INA219_CFGB_BADC_RES_AVG(13)    // 32 x 12-bit Bus samples averaged together
    
83. #define INA219_CFG_BADCRES_12BIT_64S_34MS       INA219_CFGB_BADC_RES_AVG(14)    // 64 x 12-bit Bus samples averaged together
    * d& m6 j& b5 f# K
84. #define INA219_CFG_BADCRES_12BIT_128S_68MS      INA219_CFGB_BADC_RES_AVG(15)    // 128 x 12-bit Bus samples averaged together
    
85. 
    
86. #define INA219_CFG_SADCRES_MASK                 INA219_CFGB_SADC_RES_AVG(15)    // Shunt ADC Resolution and Averaging Mask
    * l2 g$ a8 @9 w! O, V4 ?! z" @; K
87. #define INA219_CFG_SADCRES_9BIT_1S_84US         INA219_CFGB_SADC_RES_AVG(0)     // 1 x 9-bit Shunt sample
    # `% p: Y) j! a( i4 g8 q
88. #define INA219_CFG_SADCRES_10BIT_1S_148US       INA219_CFGB_SADC_RES_AVG(1)     // 1 x 10-bit Shunt sample
    
89. #define INA219_CFG_SADCRES_11BIT_1S_276US       INA219_CFGB_SADC_RES_AVG(2)     // 1 x 11-bit Shunt sample
    : [5 o* \  S8 L+ @! R
90. #define INA219_CFG_SADCRES_12BIT_1S_532US       INA219_CFGB_SADC_RES_AVG(3)     // 1 x 12-bit Shunt sample (default)
    * t" C# u5 K$ H) ^( z2 [
91. #define INA219_CFG_SADCRES_12BIT_2S_1MS         INA219_CFGB_SADC_RES_AVG(9)     // 2 x 12-bit Shunt samples averaged together
    
92. #define INA219_CFG_SADCRES_12BIT_4S_2MS         INA219_CFGB_SADC_RES_AVG(10)    // 4 x 12-bit Shunt samples averaged together
    
93. #define INA219_CFG_SADCRES_12BIT_8S_4MS         INA219_CFGB_SADC_RES_AVG(11)    // 8 x 12-bit Shunt samples averaged together
    
94. #define INA219_CFG_SADCRES_12BIT_16S_8MS        INA219_CFGB_SADC_RES_AVG(12)    // 16 x 12-bit Shunt samples averaged together
    1 u+ l9 z. \/ x( m7 s3 U
95. #define INA219_CFG_SADCRES_12BIT_32S_17MS       INA219_CFGB_SADC_RES_AVG(13)    // 32 x 12-bit Shunt samples averaged together
    " v" a" U( I$ z' b
96. #define INA219_CFG_SADCRES_12BIT_64S_34MS       INA219_CFGB_SADC_RES_AVG(14)    // 64 x 12-bit Shunt samples averaged together
    + Q& B4 A  [' |) g% @% o" J: F" R
97. #define INA219_CFG_SADCRES_12BIT_128S_68MS      INA219_CFGB_SADC_RES_AVG(15)    // 128 x 12-bit Shunt samples averaged together
    6 e3 X. _5 k; ~# t2 r2 r; g- C
98. 
    4 t& {1 w; O8 N+ `6 Z& K( k
99. #define INA219_CFG_MODE_MASK                    INA219_CFGB_MODE(7)             // Operating Mode Mask
    / p+ V$ t7 y$ m  \6 e" ]2 @! z4 D# g
100. #define INA219_CFG_MODE_POWERDOWN               INA219_CFGB_MODE(0)             // Power-Down
     # i* r! L; S, p
101. #define INA219_CFG_MODE_SVOLT_TRIGGERED         INA219_CFGB_MODE(1)             // Shunt Voltage, Triggered
     
102. #define INA219_CFG_MODE_BVOLT_TRIGGERED         INA219_CFGB_MODE(2)             // Bus Voltage, Triggered
     / [5 |' A! U2 m# N9 g
103. #define INA219_CFG_MODE_SANDBVOLT_TRIGGERED     INA219_CFGB_MODE(3)             // Shunt and Bus, Triggered
     ; ]3 s* \( Q5 _
104. #define INA219_CFG_MODE_ADCOFF                  INA219_CFGB_MODE(4)             // ADC Off (disabled)
     
105. #define INA219_CFG_MODE_SVOLT_CONTINUOUS        INA219_CFGB_MODE(5)             // Shunt Voltage, Continuous
     
106. #define INA219_CFG_MODE_BVOLT_CONTINUOUS        INA219_CFGB_MODE(6)             // Bus Voltage, Continuous
     
107. #define INA219_CFG_MODE_SANDBVOLT_CONTINUOUS    INA219_CFGB_MODE(7)             // Shunt and Bus, Continuous (default)
     
108. 
     ! \8 q8 v) L4 K( q5 A
109. 
     : A3 J$ [9 k5 S: U* G$ H
110. /*----------------------------------------------------------------------------*/
     
111. // Bus Voltage Register
     
112. #define INA219_BVOLT_CNVR                       (u16)(0x0002)       // Conversion Ready
     ( u: b* F$ ?0 D0 k
113. #define INA219_BVOLT_OVF                        (u16)(0x0001)       // Math Overflow Flag
     
114. 
     
115. typedef struct
     
116. {
     6 H1 O  k- d( V5 _' V0 p6 W
117.   signed short voltage_ina219;
     , _) \& s; \6 t; c3 [
118.   signed long shunt_ina219;
     
119.   signed long current_ina219;
     
120.   signed long power_ina219;
     / L* ~% L  L+ E  J9 G0 k
121. }INA219_DATA;
     7 E" n8 h& n- _
122. 
     
123. 
     2 l; E$ @! j6 C3 {* O
124. extern u8  ina219_busVolt_LSB_mV;
     " [7 @; @/ p; V0 s# V0 }6 \" X, R# J
125. extern u8  ina219_shuntVolt_LSB_uV;
     & {& p  a( M' ?) u9 u3 d8 ^
126. extern unsigned short ina219_calValue;
     & d2 w5 W3 t, _  ?( K5 g7 [
127. 
     " m1 R9 {9 X- z
128. extern u32 ina219_current_LSB_uA;
     ! I9 g6 A$ K. l8 B
129. extern u32 ina219_power_LSB_mW;
     / K2 F/ Q0 H: M5 u$ y* H5 h9 y1 f' _
130. 
     
131. extern void ina219_init(void);
     & F. ~! n# S0 p/ E. |$ U& o
132. extern void INA_Process(void);
     
133. extern signed short ina219_GetBusVoltage_raw(void);
     
134. extern signed short ina219_GetCurrent_raw(void);
     " a* z2 L+ p3 P+ @1 m: L" r
135. extern signed short ina219_GetBusVoltage_mV(void);
     
136. extern s32 ina219_GetShuntVoltage_uV(void);
     
137. extern s32 ina219_GetCurrent_uA(void);
     
138. extern s32 ina219_GetPower_mW(void);
     ( Q( H$ l, a( y" c
139. 
       G" \5 F  E2 m  B* S7 W3 E0 z1 p" K
140. #endif

复制代码

4 _; a, d% e( U2 K$ Q6 i

驱动写好有一段时间，记不太清了，这里就不对代码进行解释了，以免误导别人。官方驱动的代码中有着很详细的注释，此处依然保留。

不同的采样电阻有不同的设定值，校准寄存器具体的计算方法手册中写的很清楚。

+ |  \3 h# n- k5 j3 o# e1 m1 D