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1 | /*#######################################################################################*/ |
1 | /*#######################################################################################*/ |
2 | /* !!! THIS IS NOT FREE SOFTWARE !!! */ |
2 | /* !!! THIS IS NOT FREE SOFTWARE !!! */ |
3 | /*#######################################################################################*/ |
3 | /*#######################################################################################*/ |
4 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
4 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
5 | // + Copyright (c) 2008 Ingo Busker, Holger Buss |
5 | // + Copyright (c) 2008 Ingo Busker, Holger Buss |
6 | // + Nur für den privaten Gebrauch / NON-COMMERCIAL USE ONLY |
6 | // + Nur für den privaten Gebrauch / NON-COMMERCIAL USE ONLY |
7 | // + FOR NON COMMERCIAL USE ONLY |
7 | // + FOR NON COMMERCIAL USE ONLY |
8 | // + www.MikroKopter.com |
8 | // + www.MikroKopter.com |
9 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
9 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
10 | // + Es gilt für das gesamte Projekt (Hardware, Software, Binärfiles, Sourcecode und Dokumentation), |
10 | // + Es gilt für das gesamte Projekt (Hardware, Software, Binärfiles, Sourcecode und Dokumentation), |
11 | // + dass eine Nutzung (auch auszugsweise) nur für den privaten (nicht-kommerziellen) Gebrauch zulässig ist. |
11 | // + dass eine Nutzung (auch auszugsweise) nur für den privaten (nicht-kommerziellen) Gebrauch zulässig ist. |
12 | // + Sollten direkte oder indirekte kommerzielle Absichten verfolgt werden, ist mit uns (info@mikrokopter.de) Kontakt |
12 | // + Sollten direkte oder indirekte kommerzielle Absichten verfolgt werden, ist mit uns (info@mikrokopter.de) Kontakt |
13 | // + bzgl. der Nutzungsbedingungen aufzunehmen. |
13 | // + bzgl. der Nutzungsbedingungen aufzunehmen. |
14 | // + Eine kommerzielle Nutzung ist z.B.Verkauf von MikroKoptern, Bestückung und Verkauf von Platinen oder Bausätzen, |
14 | // + Eine kommerzielle Nutzung ist z.B.Verkauf von MikroKoptern, Bestückung und Verkauf von Platinen oder Bausätzen, |
15 | // + Verkauf von Luftbildaufnahmen, usw. |
15 | // + Verkauf von Luftbildaufnahmen, usw. |
16 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
16 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
17 | // + Werden Teile des Quellcodes (mit oder ohne Modifikation) weiterverwendet oder veröffentlicht, |
17 | // + Werden Teile des Quellcodes (mit oder ohne Modifikation) weiterverwendet oder veröffentlicht, |
18 | // + unterliegen sie auch diesen Nutzungsbedingungen und diese Nutzungsbedingungen incl. Copyright müssen dann beiliegen |
18 | // + unterliegen sie auch diesen Nutzungsbedingungen und diese Nutzungsbedingungen incl. Copyright müssen dann beiliegen |
19 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
19 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
20 | // + Sollte die Software (auch auszugesweise) oder sonstige Informationen des MikroKopter-Projekts |
20 | // + Sollte die Software (auch auszugesweise) oder sonstige Informationen des MikroKopter-Projekts |
21 | // + auf anderen Webseiten oder sonstigen Medien veröffentlicht werden, muss unsere Webseite "http://www.mikrokopter.de" |
21 | // + auf anderen Webseiten oder sonstigen Medien veröffentlicht werden, muss unsere Webseite "http://www.mikrokopter.de" |
22 | // + eindeutig als Ursprung verlinkt werden |
22 | // + eindeutig als Ursprung verlinkt werden |
23 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
23 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
24 | // + Keine Gewähr auf Fehlerfreiheit, Vollständigkeit oder Funktion |
24 | // + Keine Gewähr auf Fehlerfreiheit, Vollständigkeit oder Funktion |
25 | // + Benutzung auf eigene Gefahr |
25 | // + Benutzung auf eigene Gefahr |
26 | // + Wir übernehmen keinerlei Haftung für direkte oder indirekte Personen- oder Sachschäden |
26 | // + Wir übernehmen keinerlei Haftung für direkte oder indirekte Personen- oder Sachschäden |
27 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
27 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
28 | // + Die Portierung oder Nutzung der Software (oder Teile davon) auf andere Systeme (ausser der Hardware von www.mikrokopter.de) ist nur |
28 | // + Die Portierung oder Nutzung der Software (oder Teile davon) auf andere Systeme (ausser der Hardware von www.mikrokopter.de) ist nur |
29 | // + mit unserer Zustimmung zulässig |
29 | // + mit unserer Zustimmung zulässig |
30 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
30 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
31 | // + Die Funktion printf_P() unterliegt ihrer eigenen Lizenz und ist hiervon nicht betroffen |
31 | // + Die Funktion printf_P() unterliegt ihrer eigenen Lizenz und ist hiervon nicht betroffen |
32 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
32 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
33 | // + Redistributions of source code (with or without modifications) must retain the above copyright notice, |
33 | // + Redistributions of source code (with or without modifications) must retain the above copyright notice, |
34 | // + this list of conditions and the following disclaimer. |
34 | // + this list of conditions and the following disclaimer. |
35 | // + * Neither the name of the copyright holders nor the names of contributors may be used to endorse or promote products derived |
35 | // + * Neither the name of the copyright holders nor the names of contributors may be used to endorse or promote products derived |
36 | // + from this software without specific prior written permission. |
36 | // + from this software without specific prior written permission. |
37 | // + * The use of this project (hardware, software, binary files, sources and documentation) is only permitted |
37 | // + * The use of this project (hardware, software, binary files, sources and documentation) is only permitted |
38 | // + for non-commercial use (directly or indirectly) |
38 | // + for non-commercial use (directly or indirectly) |
39 | // + Commercial use (for excample: selling of MikroKopters, selling of PCBs, assembly, ...) is only permitted |
39 | // + Commercial use (for excample: selling of MikroKopters, selling of PCBs, assembly, ...) is only permitted |
40 | // + with our written permission |
40 | // + with our written permission |
41 | // + * If sources or documentations are redistributet on other webpages, out webpage (http://www.MikroKopter.de) must be |
41 | // + * If sources or documentations are redistributet on other webpages, out webpage (http://www.MikroKopter.de) must be |
42 | // + clearly linked as origin |
42 | // + clearly linked as origin |
43 | // + * porting the sources to other systems or using the software on other systems (except hardware from www.mikrokopter.de) is not allowed |
43 | // + * porting the sources to other systems or using the software on other systems (except hardware from www.mikrokopter.de) is not allowed |
44 | // |
44 | // |
45 | // + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
45 | // + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
46 | // + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
46 | // + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
47 | // + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
47 | // + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
48 | // + ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
48 | // + ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
49 | // + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
49 | // + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
50 | // + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
50 | // + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
51 | // + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
51 | // + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
52 | // + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
52 | // + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
53 | // + CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
53 | // + CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
54 | // + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
54 | // + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
55 | // + POSSIBILITY OF SUCH DAMAGE. |
55 | // + POSSIBILITY OF SUCH DAMAGE. |
56 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
56 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
57 | #include <string.h> |
57 | #include <string.h> |
58 | #include "91x_lib.h" |
58 | #include "91x_lib.h" |
59 | #include "i2c.h" |
59 | #include "i2c.h" |
60 | #include "uart1.h" |
60 | #include "uart1.h" |
61 | #include "timer1.h" |
61 | #include "timer1.h" |
62 | #include "config.h" |
62 | #include "config.h" |
63 | #include "led.h" |
63 | #include "led.h" |
- | 64 | ||
64 | 65 | ||
65 | volatile u8 I2C_State = I2C_STATE_OFF; // only one byte, because of sync by nesting irqs |
- | |
66 | 66 | volatile u8 I2C_State = I2C_STATE_OFF; // only one byte, because of sync by nesting irqs |
|
67 | // rxbuffer |
- | |
68 | volatile u8 I2C_RxBufferSize; |
- | |
69 | volatile u8 I2C_RxBuffer[I2C_RXBUFFER_LEN]; |
67 | |
- | 68 | // number of bytes to send |
|
- | 69 | volatile u8 I2C_TxBufferSize; |
|
- | 70 | // number of bytes to receive |
|
70 | // txbuffer |
71 | volatile u8 I2C_RxBufferSize; |
71 | volatile u8 I2C_TxBufferSize; |
- | |
- | 72 | // the transfer buffer |
|
72 | volatile u8 I2C_TxBuffer[I2C_TXBUFFER_LEN]; |
73 | volatile u8 I2C_Buffer[I2C_BUFFER_LEN]; |
- | 74 | // the transfer direction |
|
73 | 75 | volatile u8 I2C_Direction; |
|
- | 76 | // the slave address |
|
74 | volatile u8 I2C_Direction; |
77 | volatile u8 I2C_SlaveAddress = 0x00; |
75 | volatile u8 I2C_SlaveAddress = 0x00; |
- | |
- | 78 | // function pointer to process the received bytes |
|
76 | I2C_pRxHandler_t I2C_pRxHandler = NULL; |
79 | I2C_pRxHandler_t I2C_pRxHandler = NULL; |
77 | 80 | // goblal timeout |
|
78 | volatile u32 I2C1_Timeout = 0; |
81 | volatile u32 I2C1_Timeout = 0; |
79 | 82 | ||
80 | //-------------------------------------------------------------- |
83 | //-------------------------------------------------------------- |
81 | void I2C1_Init(void) |
84 | void I2C1_Init(void) |
82 | { |
85 | { |
83 | I2C_InitTypeDef I2C_Struct; |
86 | I2C_InitTypeDef I2C_Struct; |
84 | GPIO_InitTypeDef GPIO_InitStructure; |
87 | GPIO_InitTypeDef GPIO_InitStructure; |
85 | 88 | ||
86 | I2C_State = I2C_STATE_OFF; |
89 | I2C_State = I2C_STATE_OFF; |
87 | 90 | ||
88 | UART1_PutString("\r\n I2C init..."); |
91 | UART1_PutString("\r\n I2C init..."); |
89 | // enable Port 2 peripherie |
92 | // enable Port 2 peripherie |
90 | SCU_APBPeriphClockConfig(__GPIO2, ENABLE); |
93 | SCU_APBPeriphClockConfig(__GPIO2, ENABLE); |
91 | // disable a reset state |
94 | // disable a reset state |
92 | SCU_APBPeriphReset(__GPIO2, DISABLE); |
95 | SCU_APBPeriphReset(__GPIO2, DISABLE); |
93 | 96 | ||
94 | // free a busy bus |
97 | // free a busy bus |
95 | 98 | ||
96 | // At switch on I2C devices can get in a state where they |
99 | // At switch on I2C devices can get in a state where they |
97 | // are still waiting for a command due to all the bus lines bouncing |
100 | // are still waiting for a command due to all the bus lines bouncing |
98 | // around at startup have started clocking data into the device(s). |
101 | // around at startup have started clocking data into the device(s). |
99 | // Enable the ports as open collector port outputs |
102 | // Enable the ports as open collector port outputs |
100 | // and clock out at least 9 SCL pulses, then generate a stop |
103 | // and clock out at least 9 SCL pulses, then generate a stop |
101 | // condition and then leave the clock line high. |
104 | // condition and then leave the clock line high. |
102 | 105 | ||
103 | // configure P2.2->I2C1_CLKOUT and P2.3->I2C1_DOUT to normal port operation |
106 | // configure P2.2->I2C1_CLKOUT and P2.3->I2C1_DOUT to normal port operation |
104 | GPIO_StructInit(&GPIO_InitStructure); |
107 | GPIO_StructInit(&GPIO_InitStructure); |
105 | GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput; |
108 | GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput; |
106 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3; |
109 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3; |
107 | GPIO_InitStructure.GPIO_Type = GPIO_Type_OpenCollector; |
110 | GPIO_InitStructure.GPIO_Type = GPIO_Type_OpenCollector; |
108 | GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Disable; |
111 | GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Disable; |
109 | GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt1; |
112 | GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt1; |
110 | GPIO_Init(GPIO2, &GPIO_InitStructure); |
113 | GPIO_Init(GPIO2, &GPIO_InitStructure); |
111 | 114 | ||
112 | u8 i; |
115 | u8 i; |
113 | u32 delay; |
116 | u32 delay; |
114 | // set SCL high and then SDA to low (start condition) |
117 | // set SCL high and then SDA to low (start condition) |
115 | GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_SET); |
118 | GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_SET); |
116 | delay = SetDelay(1); |
119 | delay = SetDelay(1); |
117 | while (!CheckDelay(delay)); |
120 | while (!CheckDelay(delay)); |
118 | GPIO_WriteBit(GPIO2, GPIO_Pin_3, Bit_RESET); |
121 | GPIO_WriteBit(GPIO2, GPIO_Pin_3, Bit_RESET); |
119 | // toggle SCL at least 10 times from high to low to high |
122 | // toggle SCL at least 10 times from high to low to high |
120 | for(i = 0; i < 10; i++) |
123 | for(i = 0; i < 10; i++) |
121 | { |
124 | { |
122 | delay = SetDelay(1); |
125 | delay = SetDelay(1); |
123 | while (!CheckDelay(delay)); |
126 | while (!CheckDelay(delay)); |
124 | 127 | ||
125 | GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_RESET); |
128 | GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_RESET); |
126 | delay = SetDelay(1); |
129 | delay = SetDelay(1); |
127 | while (!CheckDelay(delay)); |
130 | while (!CheckDelay(delay)); |
128 | GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_SET); |
131 | GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_SET); |
129 | } |
132 | } |
130 | delay = SetDelay(1); |
133 | delay = SetDelay(1); |
131 | while (!CheckDelay(delay)); |
134 | while (!CheckDelay(delay)); |
132 | // create stop condition setting SDA HIGH when SCL is HIGH |
135 | // create stop condition setting SDA HIGH when SCL is HIGH |
133 | GPIO_WriteBit(GPIO2, GPIO_Pin_3, Bit_SET); |
136 | GPIO_WriteBit(GPIO2, GPIO_Pin_3, Bit_SET); |
134 | 137 | ||
135 | 138 | ||
136 | // reconfigure P2.2->I2C1_CLKOUT and P2.3->I2C1_DOUT |
139 | // reconfigure P2.2->I2C1_CLKOUT and P2.3->I2C1_DOUT |
137 | GPIO_StructInit(&GPIO_InitStructure); |
140 | GPIO_StructInit(&GPIO_InitStructure); |
138 | GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput; |
141 | GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput; |
139 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3; |
142 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3; |
140 | GPIO_InitStructure.GPIO_Type = GPIO_Type_OpenCollector; |
143 | GPIO_InitStructure.GPIO_Type = GPIO_Type_OpenCollector; |
141 | GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Enable; |
144 | GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Enable; |
142 | GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt2; //I2C1_CLKOUT, I2C1_DOUT |
145 | GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt2; //I2C1_CLKOUT, I2C1_DOUT |
143 | GPIO_Init(GPIO2, &GPIO_InitStructure); |
146 | GPIO_Init(GPIO2, &GPIO_InitStructure); |
144 | 147 | ||
145 | // enable I2C peripherie |
148 | // enable I2C peripherie |
146 | SCU_APBPeriphClockConfig(__I2C1,ENABLE); |
149 | SCU_APBPeriphClockConfig(__I2C1,ENABLE); |
147 | // reset I2C peripherie |
150 | // reset I2C peripherie |
148 | SCU_APBPeriphReset(__I2C1,ENABLE); |
151 | SCU_APBPeriphReset(__I2C1,ENABLE); |
149 | SCU_APBPeriphReset(__I2C1,DISABLE); |
152 | SCU_APBPeriphReset(__I2C1,DISABLE); |
150 | 153 | ||
151 | I2C_DeInit(I2C1); |
154 | I2C_DeInit(I2C1); |
152 | I2C_StructInit(&I2C_Struct); |
155 | I2C_StructInit(&I2C_Struct); |
153 | I2C_Struct.I2C_GeneralCall = I2C_GeneralCall_Disable; |
156 | I2C_Struct.I2C_GeneralCall = I2C_GeneralCall_Disable; |
154 | I2C_Struct.I2C_Ack = I2C_Ack_Enable; |
157 | I2C_Struct.I2C_Ack = I2C_Ack_Enable; |
155 | I2C_Struct.I2C_CLKSpeed = I2C1_CLOCK; |
158 | I2C_Struct.I2C_CLKSpeed = I2C1_CLOCK; |
156 | I2C_Struct.I2C_OwnAddress = 0x00; |
159 | I2C_Struct.I2C_OwnAddress = 0x00; |
157 | I2C_Init(I2C1, &I2C_Struct); |
160 | I2C_Init(I2C1, &I2C_Struct); |
158 | 161 | ||
159 | // empty rx and tx buffer |
162 | // empty rx and tx buffer counters |
160 | I2C_TxBufferSize = 0; |
163 | I2C_TxBufferSize = 0; |
161 | I2C_RxBufferSize = 0; |
164 | I2C_RxBufferSize = 0; |
162 | 165 | ||
163 | I2C_Cmd(I2C1, ENABLE); |
166 | I2C_Cmd(I2C1, ENABLE); |
164 | I2C_ITConfig(I2C1, ENABLE); |
167 | I2C_ITConfig(I2C1, ENABLE); |
165 | 168 | ||
166 | VIC_Config(I2C1_ITLine, VIC_IRQ , PRIORITY_I2C1); |
169 | VIC_Config(I2C1_ITLine, VIC_IRQ , PRIORITY_I2C1); |
167 | 170 | ||
168 | I2C1_Timeout = SetDelay(10*I2C1_TIMEOUT); |
171 | I2C1_Timeout = SetDelay(10*I2C1_TIMEOUT); |
169 | I2C_GenerateSTOP(I2C1, ENABLE); |
172 | I2C_GenerateSTOP(I2C1, ENABLE); |
170 | I2C_State = I2C_STATE_IDLE; |
173 | I2C_State = I2C_STATE_IDLE; |
- | 174 | ||
- | 175 | // start some dummy transmissions cycles |
|
- | 176 | // to get the irq routine to work |
|
- | 177 | for(i=0;i<10;i++) |
|
- | 178 | { |
|
- | 179 | I2C_State = I2C_STATE_BUFFBUSY; |
|
- | 180 | I2C_Transmission(0,1,0,1); |
|
- | 181 | if(I2C_WaitForEndOfTransmission(10)) break; |
|
- | 182 | UART1_Putchar('.'); |
|
171 | 183 | } |
|
172 | UART1_PutString("ok"); |
184 | UART1_PutString("ok"); |
173 | } |
185 | } |
174 | 186 | ||
175 | 187 | ||
176 | //-------------------------------------------------------------- |
188 | //-------------------------------------------------------------- |
177 | void I2C1_Deinit(void) |
189 | void I2C1_Deinit(void) |
178 | { |
190 | { |
179 | GPIO_InitTypeDef GPIO_InitStructure; |
191 | GPIO_InitTypeDef GPIO_InitStructure; |
180 | UART1_PutString("\r\n I2C deinit..."); |
192 | UART1_PutString("\r\n I2C deinit..."); |
181 | I2C_GenerateStart(I2C1, DISABLE); |
193 | I2C_GenerateStart(I2C1, DISABLE); |
182 | I2C_GenerateSTOP(I2C1, ENABLE); |
194 | I2C_GenerateSTOP(I2C1, ENABLE); |
183 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
195 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
184 | I2C_State = I2C_STATE_OFF; |
196 | I2C_State = I2C_STATE_OFF; |
185 | I2C_ITConfig(I2C1, DISABLE); |
197 | I2C_ITConfig(I2C1, DISABLE); |
186 | I2C_Cmd(I2C1, DISABLE); |
198 | I2C_Cmd(I2C1, DISABLE); |
187 | I2C_DeInit(I2C1); |
199 | I2C_DeInit(I2C1); |
188 | SCU_APBPeriphClockConfig(__I2C1, DISABLE); |
200 | SCU_APBPeriphClockConfig(__I2C1, DISABLE); |
189 | 201 | ||
190 | // set ports to input |
202 | // set ports to input |
191 | SCU_APBPeriphClockConfig(__GPIO2, ENABLE); |
203 | SCU_APBPeriphClockConfig(__GPIO2, ENABLE); |
192 | GPIO_StructInit(&GPIO_InitStructure); |
204 | GPIO_StructInit(&GPIO_InitStructure); |
193 | GPIO_InitStructure.GPIO_Direction = GPIO_PinInput; |
205 | GPIO_InitStructure.GPIO_Direction = GPIO_PinInput; |
194 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3; |
206 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3; |
195 | GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull; |
207 | GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull; |
196 | GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Disable; |
208 | GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Disable; |
197 | GPIO_InitStructure.GPIO_Alternate = GPIO_InputAlt1; |
209 | GPIO_InitStructure.GPIO_Alternate = GPIO_InputAlt1; |
198 | GPIO_Init(GPIO2, &GPIO_InitStructure); |
210 | GPIO_Init(GPIO2, &GPIO_InitStructure); |
199 | 211 | ||
200 | // empty rx and tx buffer |
212 | // empty rx and tx buffer |
201 | I2C_TxBufferSize = 0; |
213 | I2C_TxBufferSize = 0; |
202 | I2C_RxBufferSize = 0; |
214 | I2C_RxBufferSize = 0; |
203 | 215 | ||
204 | I2C1_Timeout = SetDelay(10*I2C1_TIMEOUT); |
216 | I2C1_Timeout = SetDelay(10*I2C1_TIMEOUT); |
205 | 217 | ||
206 | UART1_PutString("ok"); |
218 | UART1_PutString("ok"); |
207 | } |
219 | } |
208 | - | ||
209 | 220 | ||
210 | //-------------------------------------------------------------- |
221 | //-------------------------------------------------------------- |
211 | void I2C1_IRQHandler(void) |
222 | void I2C1_IRQHandler(void) |
212 | { |
223 | { |
213 | static u8 Rx_Idx = 0, Tx_Idx = 0; |
224 | static u8 Rx_Idx = 0, Tx_Idx = 0; |
214 | u16 status; |
225 | u16 status; |
215 | 226 | ||
216 | //IENABLE; // do not enable IRQ nesting for I2C!!!! |
227 | //IENABLE; // do not enable IRQ nesting for I2C!!!! |
217 | - | ||
218 | // detemine I2C State |
228 | // detemine I2C State |
219 | status = I2C_GetLastEvent(I2C1); |
229 | status = I2C_GetLastEvent(I2C1); |
220 | 230 | ||
221 | if(status & (I2C_FLAG_AF|I2C_FLAG_BERR)) // if an acknowledge failure or bus error occured |
231 | if(status & (I2C_FLAG_AF|I2C_FLAG_BERR)) // if an acknowledge failure or bus error occured |
222 | { // Set and subsequently clear the STOP bit while BTF is set. |
232 | { // Set and subsequently clear the STOP bit while BTF is set. |
223 | while(I2C_GetFlagStatus (I2C1, I2C_FLAG_BTF) != RESET) |
233 | while(I2C_GetFlagStatus (I2C1, I2C_FLAG_BTF) != RESET) |
224 | { |
234 | { |
225 | I2C_GenerateSTOP (I2C1, ENABLE); // free the bus |
235 | I2C_GenerateSTOP (I2C1, ENABLE); // free the bus |
226 | I2C_GenerateSTOP (I2C1, DISABLE); // free the bus |
236 | I2C_GenerateSTOP (I2C1, DISABLE); // free the bus |
227 | } |
237 | } |
228 | I2C_State = I2C_STATE_IDLE; |
238 | I2C_State = I2C_STATE_IDLE; |
229 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
239 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
230 | LED_GRN_OFF; |
240 | LED_GRN_OFF; |
231 | return; |
241 | return; |
232 | } |
242 | } |
233 | else |
243 | else |
234 | { // depending on current i2c state |
244 | { // depending on current i2c state |
235 | switch(status) |
245 | switch(status) |
236 | { |
246 | { |
237 | // the start condition was initiated on the bus |
247 | // the start condition was initiated on the bus |
238 | case I2C_EVENT_MASTER_MODE_SELECT: |
248 | case I2C_EVENT_MASTER_MODE_SELECT: |
239 | LED_GRN_ON; |
249 | LED_GRN_ON; |
240 | // update current bus state variable |
250 | // update current bus state variable |
241 | // jump to rx state if there is nothing to send |
251 | // jump to rx state if there is nothing to send |
242 | switch(I2C_Direction) |
252 | switch(I2C_Direction) |
243 | { |
253 | { |
244 | case I2C_MODE_TRANSMITTER: |
254 | case I2C_MODE_TRANSMITTER: |
245 | I2C_State = I2C_STATE_TX_PROGRESS; |
255 | I2C_State = I2C_STATE_TX_PROGRESS; |
246 | break; |
256 | break; |
247 | 257 | ||
248 | case I2C_MODE_RECEIVER: |
258 | case I2C_MODE_RECEIVER: |
249 | if (I2C_RxBufferSize == 0) // nothingto send? |
259 | if (I2C_RxBufferSize == 0) // nothing to send? |
250 | { |
260 | { |
251 | I2C_GenerateSTOP (I2C1, ENABLE); |
261 | I2C_GenerateSTOP (I2C1, ENABLE); |
252 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
262 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
253 | LED_GRN_OFF; |
263 | LED_GRN_OFF; |
254 | I2C_State = I2C_STATE_IDLE; |
264 | I2C_State = I2C_STATE_IDLE; |
255 | return; |
265 | return; |
256 | } |
266 | } |
257 | else |
267 | else |
258 | { |
268 | { |
259 | I2C_State = I2C_STATE_RX_PROGRESS; |
269 | I2C_State = I2C_STATE_RX_PROGRESS; |
260 | } |
270 | } |
261 | break; |
271 | break; |
262 | 272 | ||
263 | default: // invalid direction |
273 | default: // invalid direction |
264 | I2C_GenerateSTOP (I2C1, ENABLE); |
274 | I2C_GenerateSTOP (I2C1, ENABLE); |
265 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
275 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
266 | LED_GRN_OFF; |
276 | LED_GRN_OFF; |
267 | I2C_State = I2C_STATE_IDLE; |
277 | I2C_State = I2C_STATE_IDLE; |
268 | return; |
278 | return; |
269 | } |
279 | } |
270 | // enable acknowledge |
280 | // enable acknowledge |
271 | I2C_AcknowledgeConfig (I2C1, ENABLE); |
281 | I2C_AcknowledgeConfig (I2C1, ENABLE); |
272 | // send address/direction byte on the bus |
282 | // send address/direction byte on the bus |
273 | I2C_Send7bitAddress(I2C1, I2C_SlaveAddress, I2C_Direction); |
283 | I2C_Send7bitAddress(I2C1, I2C_SlaveAddress, I2C_Direction); |
274 | break; |
284 | break; |
275 | 285 | ||
276 | // the address byte was send |
286 | // the address byte was send |
277 | case I2C_EVENT_MASTER_MODE_SELECTED: |
287 | case I2C_EVENT_MASTER_MODE_SELECTED: |
278 | // Clear EV6 by set again the PE bit |
288 | // Clear EV6 by set again the PE bit |
279 | I2C_Cmd(I2C1, ENABLE); |
289 | I2C_Cmd(I2C1, ENABLE); |
280 | switch(I2C_State) |
290 | switch(I2C_State) |
281 | { |
291 | { |
282 | case I2C_STATE_TX_PROGRESS: |
292 | case I2C_STATE_TX_PROGRESS: |
283 | // send 1st data byte |
293 | // send 1st data byte |
284 | Tx_Idx = 0; |
294 | Tx_Idx = 0; |
285 | I2C_SendData(I2C1, I2C_TxBuffer[Tx_Idx]); |
295 | I2C_SendData(I2C1, I2C_Buffer[Tx_Idx]); |
286 | Tx_Idx++; |
296 | Tx_Idx++; |
287 | // reset timeout |
297 | // reset timeout |
288 | I2C1_Timeout = SetDelay(I2C1_TIMEOUT); // after inactivity the I2C1 bus will be reset |
298 | I2C1_Timeout = SetDelay(I2C1_TIMEOUT); // after inactivity the I2C1 bus will be reset |
289 | break; |
299 | break; |
290 | 300 | ||
291 | case I2C_STATE_RX_PROGRESS: |
301 | case I2C_STATE_RX_PROGRESS: |
292 | Rx_Idx = 0; |
302 | Rx_Idx = 0; |
293 | // disable acknoledge if only one byte has to be read |
303 | // disable acknoledge if only one byte has to be read |
294 | if(I2C_RxBufferSize == 1) I2C_AcknowledgeConfig (I2C1, DISABLE); |
304 | if(I2C_RxBufferSize == 1) I2C_AcknowledgeConfig (I2C1, DISABLE); |
295 | break; |
305 | break; |
296 | 306 | ||
297 | default: // unknown I2C state |
307 | default: // unknown I2C state |
298 | // should never happen |
308 | // should never happen |
299 | I2C_GenerateSTOP (I2C1, ENABLE); |
309 | I2C_GenerateSTOP (I2C1, ENABLE); |
300 | LED_GRN_OFF; |
310 | LED_GRN_OFF; |
301 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
311 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
302 | I2C_State = I2C_STATE_IDLE; |
312 | I2C_State = I2C_STATE_IDLE; |
303 | return; |
313 | return; |
304 | break; |
314 | break; |
305 | } |
315 | } |
306 | break; |
316 | break; |
307 | 317 | ||
308 | // the master has transmitted a byte and slave has been acknowledged |
318 | // the master has transmitted a byte and slave has been acknowledged |
309 | case I2C_EVENT_MASTER_BYTE_TRANSMITTED: |
319 | case I2C_EVENT_MASTER_BYTE_TRANSMITTED: |
310 | 320 | ||
311 | // some bytes have to be transmitted |
321 | // some bytes have to be transmitted |
312 | if(Tx_Idx < I2C_TxBufferSize) |
322 | if(Tx_Idx < I2C_TxBufferSize) |
313 | { |
323 | { |
314 | I2C_SendData(I2C1, I2C_TxBuffer[Tx_Idx]); |
324 | I2C_SendData(I2C1, I2C_Buffer[Tx_Idx]); |
315 | Tx_Idx++; |
325 | Tx_Idx++; |
316 | } |
326 | } |
317 | else // last byte was send |
327 | else // last byte was send |
318 | { |
328 | { |
319 | // generate stop or repeated start condition |
329 | // generate stop or repeated start condition |
320 | if (I2C_RxBufferSize > 0) // is any answer byte expected? |
330 | if (I2C_RxBufferSize > 0) // is any answer byte expected? |
321 | { |
331 | { |
322 | I2C_Direction = I2C_MODE_RECEIVER; // switch to master receiver after repeated start condition |
332 | I2C_Direction = I2C_MODE_RECEIVER; // switch to master receiver after repeated start condition |
323 | I2C_GenerateStart(I2C1, ENABLE); // initiate repeated start condition on the bus |
333 | I2C_GenerateStart(I2C1, ENABLE); // initiate repeated start condition on the bus |
324 | } |
334 | } |
325 | else |
335 | else |
326 | { // stop communication |
336 | { // stop communication |
327 | I2C_GenerateSTOP(I2C1, ENABLE); // generate stop condition to free the bus |
337 | I2C_GenerateSTOP(I2C1, ENABLE); // generate stop condition to free the bus |
328 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
338 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
329 | LED_GRN_OFF; |
339 | LED_GRN_OFF; |
330 | I2C_State = I2C_STATE_IDLE; // ready for new actions |
340 | I2C_State = I2C_STATE_IDLE; // ready for new actions |
331 | } |
341 | } |
332 | } |
342 | } |
333 | break; |
343 | break; |
334 | 344 | ||
335 | // the master has received a byte from the slave |
345 | // the master has received a byte from the slave |
336 | case I2C_EVENT_MASTER_BYTE_RECEIVED: |
346 | case I2C_EVENT_MASTER_BYTE_RECEIVED: |
337 | // some bytes have to be received |
347 | // some bytes have to be received |
338 | if ( Rx_Idx+1 < I2C_RxBufferSize) |
348 | if ( Rx_Idx+1 < I2C_RxBufferSize) |
339 | { // copy received byte from the data register to the rx-buffer |
349 | { // copy received byte from the data register to the rx-buffer |
340 | I2C_RxBuffer[Rx_Idx] = I2C_ReceiveData(I2C1); |
350 | I2C_Buffer[Rx_Idx] = I2C_ReceiveData(I2C1); |
341 | } |
351 | } |
342 | else // if the last byte was received |
352 | else // if the last byte was received |
343 | { |
353 | { |
344 | // generate a STOP condition on the bus before reading data register |
354 | // generate a STOP condition on the bus before reading data register |
345 | I2C_GenerateSTOP(I2C1, ENABLE); |
355 | I2C_GenerateSTOP(I2C1, ENABLE); |
346 | I2C_RxBuffer[Rx_Idx] = I2C_ReceiveData(I2C1); |
356 | I2C_Buffer[Rx_Idx] = I2C_ReceiveData(I2C1); |
347 | // call the rx handler function to process recieved data |
357 | // call the rx handler function to process recieved data |
348 | if(I2C_pRxHandler != NULL) (*I2C_pRxHandler)((u8*)I2C_RxBuffer, I2C_RxBufferSize); |
358 | if(I2C_pRxHandler != NULL) (*I2C_pRxHandler)((u8*)I2C_Buffer, I2C_RxBufferSize); |
349 | I2C1_Timeout = SetDelay(I2C1_TIMEOUT); |
359 | I2C1_Timeout = SetDelay(I2C1_TIMEOUT); |
350 | DebugOut.Analog[15]++; |
360 | DebugOut.Analog[15]++; |
351 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
361 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
352 | LED_GRN_OFF; |
362 | LED_GRN_OFF; |
353 | I2C_State = I2C_STATE_IDLE; |
363 | I2C_State = I2C_STATE_IDLE; |
354 | return; |
364 | return; |
355 | } |
365 | } |
356 | Rx_Idx++; |
366 | Rx_Idx++; |
357 | // if the 2nd last byte was received disable acknowledge for the last one |
367 | // if the 2nd last byte was received disable acknowledge for the last one |
358 | if ( (Rx_Idx + 1) == I2C_RxBufferSize ) |
368 | if ( (Rx_Idx + 1) == I2C_RxBufferSize ) |
359 | { |
369 | { |
360 | I2C_AcknowledgeConfig(I2C1, DISABLE); |
370 | I2C_AcknowledgeConfig(I2C1, DISABLE); |
361 | } |
371 | } |
362 | break; |
372 | break; |
363 | 373 | ||
364 | default:// unknown event |
374 | default:// unknown event |
365 | // should never happen |
375 | // should never happen |
366 | I2C_GenerateSTOP (I2C1, ENABLE); |
376 | I2C_GenerateSTOP (I2C1, ENABLE); |
367 | LED_GRN_OFF; |
377 | LED_GRN_OFF; |
368 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
378 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
369 | I2C_State = I2C_STATE_IDLE; |
379 | I2C_State = I2C_STATE_IDLE; |
370 | break; |
380 | break; |
371 | } |
381 | } |
372 | } |
382 | } |
373 | //IDISABLE; // do not enable IRQ nesting for I2C!!!! |
383 | //IDISABLE; // do not enable IRQ nesting for I2C!!!! |
374 | } |
384 | } |
- | 385 | ||
- | 386 | // ---------------------------------------------------------------------------------------- |
|
- | 387 | // wait for end of transmission |
|
- | 388 | u8 I2C_WaitForEndOfTransmission(u32 timeout) |
|
- | 389 | { |
|
- | 390 | u32 time = SetDelay(timeout); |
|
- | 391 | while(I2C_State != I2C_STATE_IDLE) |
|
- | 392 | { |
|
- | 393 | if(CheckDelay(time)) return(0); |
|
- | 394 | } |
|
- | 395 | return(1); |
|
- | 396 | } |
|
- | 397 | ||
- | 398 | // ---------------------------------------------------------------------------------------- |
|
- | 399 | // try to get access to the transfer buffer within a timeout limit |
|
- | 400 | // returs 1 on success and 0 on error/timeout |
|
- | 401 | u8 I2C_LockBuffer(u32 timeout) |
|
- | 402 | { |
|
- | 403 | if(I2C_WaitForEndOfTransmission(timeout)) |
|
- | 404 | { |
|
- | 405 | I2C_State = I2C_STATE_BUFFBUSY; |
|
- | 406 | return(1); |
|
- | 407 | } |
|
- | 408 | else return(0); |
|
- | 409 | } |
|
375 | // ---------------------------------------------------------------------------------------- |
410 | // ---------------------------------------------------------------------------------------- |
376 | // initate an i2c transmission |
411 | // initate an i2c transmission |
377 | u8 I2C_Transmission(u8 SlaveAddr, I2C_pRxHandler_t pRxHandler, u8 RxBytes) |
412 | u8 I2C_Transmission(u8 SlaveAddr, u8 TxBytes, I2C_pRxHandler_t pRxHandler, u8 RxBytes) |
378 | { |
413 | { |
379 | u8 retval = 0; |
414 | u8 retval = 0; |
- | 415 | if(I2C_State == I2C_STATE_BUFFBUSY) |
|
380 | 416 | { |
|
381 | if(I2C_State == I2C_STATE_IDLE) |
417 | if((RxBytes > I2C_BUFFER_LEN) || (TxBytes > I2C_BUFFER_LEN)) |
382 | { |
418 | { |
- | 419 | I2C_State = I2C_STATE_IDLE; |
|
- | 420 | return(retval); |
|
- | 421 | } |
|
383 | I2C_RxBufferSize = RxBytes; |
422 | I2C_RxBufferSize = RxBytes; |
- | 423 | I2C_TxBufferSize = TxBytes; |
|
384 | // set direction to master transmitter |
424 | // set direction to master transmitter |
385 | if( (I2C_TxBufferSize > 0) && (I2C_TxBufferSize < I2C_TXBUFFER_LEN) ) I2C_Direction = I2C_MODE_TRANSMITTER; |
425 | if( (I2C_TxBufferSize > 0) && (I2C_TxBufferSize < I2C_BUFFER_LEN) ) I2C_Direction = I2C_MODE_TRANSMITTER; |
386 | else if (( I2C_RxBufferSize > 0 ) && (I2C_RxBufferSize < I2C_RXBUFFER_LEN) ) I2C_Direction = I2C_MODE_RECEIVER; |
426 | else if (( I2C_RxBufferSize > 0 ) && (I2C_RxBufferSize < I2C_BUFFER_LEN) ) I2C_Direction = I2C_MODE_RECEIVER; |
387 | else // nothing to send or receive |
427 | else // nothing to send or receive |
388 | { |
428 | { |
- | 429 | I2C_State = I2C_STATE_IDLE; |
|
389 | I2C_TxBufferSize = 0; |
430 | I2C_TxBufferSize = 0; |
390 | I2C_RxBufferSize = 0; |
431 | I2C_RxBufferSize = 0; |
391 | return(retval); |
432 | return(retval); |
392 | } |
433 | } |
393 | // update slave address and rx data handler funbction pointer |
434 | // update slave address and rx data handler funbction pointer |
394 | I2C_SlaveAddress = SlaveAddr; |
435 | I2C_SlaveAddress = SlaveAddr; |
395 | I2C_pRxHandler = pRxHandler; |
436 | I2C_pRxHandler = pRxHandler; |
396 | // test on busy flag and clear it |
437 | // test on busy flag and clear it |
397 | I2C_CheckEvent( I2C1, I2C_FLAG_BUSY ); |
438 | I2C_CheckEvent( I2C1, I2C_FLAG_BUSY ); |
398 | // enable I2C IRQ |
439 | // enable I2C IRQ |
399 | VIC_ITCmd(I2C1_ITLine, ENABLE); |
440 | VIC_ITCmd(I2C1_ITLine, ENABLE); |
400 | // initiate start condition on the bus |
441 | // initiate start condition on the bus |
401 | I2C_GenerateStart(I2C1, ENABLE); |
442 | I2C_GenerateStart(I2C1, ENABLE); |
402 | retval = 1; |
443 | retval = 1; |
403 | } |
444 | } |
404 | return(retval); |
445 | return(retval); |
405 | } |
446 | } |
406 | 447 |