1 | #include "stm32f10x_conf.h"
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2 | //#include "stm32f10x.h"
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3 |
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4 | void Init(void){
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5 | // Hardware initialiser
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6 | RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE); // enable I2C;
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7 | RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE); // enable alternate functions (why?);
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8 |
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9 | RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE); // GPIO C enable
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10 | GPIO_InitTypeDef gpioInit;
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11 | gpioInit.GPIO_Mode = GPIO_Mode_Out_OD;
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12 | gpioInit.GPIO_Speed = GPIO_Speed_2MHz;
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13 | gpioInit.GPIO_Pin = GPIO_Pin_13;
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14 | GPIO_Init(GPIOC, &gpioInit);
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15 | GPIO_WriteBit(GPIOC, ((uint16_t)0x2000), Bit_SET);
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16 |
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17 | RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); // GPIO B enable
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18 | GPIO_InitTypeDef gpioInit1;
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19 | gpioInit1.GPIO_Mode = GPIO_Mode_AF_OD;
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20 | gpioInit1.GPIO_Speed = GPIO_Speed_50MHz;
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21 | gpioInit1.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7; // route I2C pins
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22 | GPIO_Init(GPIOB, &gpioInit1);
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23 |
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24 | NVIC_InitTypeDef NVICinit; // configure NVIC
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25 | NVICinit.NVIC_IRQChannel = I2C1_EV_IRQn; // add I2C_event interrupt
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26 | NVICinit.NVIC_IRQChannelPreemptionPriority = 0;
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27 | NVICinit.NVIC_IRQChannelSubPriority = 0;
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28 | NVICinit.NVIC_IRQChannelCmd = ENABLE;
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29 | NVIC_Init(&NVICinit);
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30 |
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31 | NVICinit.NVIC_IRQChannel = I2C1_ER_IRQn; // add I2C_error interrupt
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32 | NVICinit.NVIC_IRQChannelPreemptionPriority = 0;
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33 | NVICinit.NVIC_IRQChannelSubPriority = 0;
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34 | NVICinit.NVIC_IRQChannelCmd = ENABLE;
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35 | NVIC_Init(&NVICinit);
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36 |
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37 | I2C_DeInit(I2C1); // init I2C module
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38 | I2C_InitTypeDef I2Cinit;
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39 | I2Cinit.I2C_Ack = I2C_Ack_Enable;
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40 | I2Cinit.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
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41 | I2Cinit.I2C_ClockSpeed = 100000;
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42 | I2Cinit.I2C_DutyCycle = I2C_DutyCycle_2;
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43 | I2Cinit.I2C_Mode = I2C_Mode_I2C;
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44 | I2Cinit.I2C_OwnAddress1 = 0;
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45 | I2C_Init(I2C1, &I2Cinit);
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46 |
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47 | I2C_ITConfig(I2C1, I2C_IT_EVT, ENABLE); // enable event, error and buffer interrupts
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48 | I2C_ITConfig(I2C1, I2C_IT_ERR, ENABLE);
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49 | I2C_ITConfig(I2C1, I2C_IT_BUF, ENABLE);
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50 |
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51 | I2C_Cmd(I2C1, ENABLE);
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52 | }
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53 |
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54 | volatile uint8_t I2C_errorcode = 0, I2C_addr = 0, I2C_num_bytes = 0;
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55 | volatile uint8_t* I2C_reading_pointer;
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56 | static uint8_t OLED_init[29]= { // Initialization Sequence
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57 | 0x00, // Commands will be sent
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58 | 0xAE, // Display OFF (sleep mode)
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59 | 0x20, 0b00, // Set Memory Addressing Mode
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60 | // 00=Horizontal Addressing Mode; 01=Vertical Addressing Mode;
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61 | // 10=Page Addressing Mode (RESET); 11=Invalid
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62 | 0xB0, // Set Page Start Address for Page Addressing Mode, 0-7
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63 | 0xC8, // Set COM Output Scan Direction
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64 | 0x00, // --set low column address
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65 | 0x10, // --set high column address
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66 | 0x40, // --set start line address
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67 | 0x81, 0x3F, // Set contrast control register
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68 | 0xA1, // Set Segment Re-map. A0=address mapped; A1=address 127 mapped.
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69 | 0xA6, // Set display mode. A6=Normal; A7=Inverse
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70 | 0xA8, 63, // Set multiplex ratio(1 to 64)
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71 | 0xA4, // Output RAM to Display
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72 | // 0xA4=Output follows RAM content; 0xA5,Output ignores RAM content
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73 | 0xD3, 0x00, // Set display offset. 00 = no offset
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74 | 0xD5, // --set display clock divide ratio/oscillator frequency
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75 | 0xF0, // --set divide ratio
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76 | 0xD9, 0x22, // Set pre-charge period
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77 | 0xDA, 0x12, // Set com pins hardware configuration
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78 | 0xDB, // --set vcomh
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79 | 0x20, // 0x20,0.77xVcc
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80 | 0x8D, 0x14, // Set DC-DC enable
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81 | 0xAF //?
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82 | };
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83 |
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84 | void I2C1_EV_IRQHandler(){ // Self-containing I2C interrupt
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85 | if(I2C1->SR1 & I2C_SR1_SB){ // triggered by start condition ->
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86 | I2C1->DR = I2C_addr; // send I2C adress
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87 | }else if((I2C1->SR1 & I2C_SR1_ADDR)||(I2C1->SR1 & I2C_SR1_TXE)){ // if not, then send data
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88 | if(I2C_num_bytes){ // in case its available
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89 | I2C1->DR = *I2C_reading_pointer;
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90 | I2C_reading_pointer++;
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91 | I2C_num_bytes--;
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92 | }
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93 | } // if not - send stop condition
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94 | else if((I2C1->SR1 & I2C_SR1_BTF)){
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95 | I2C1->CR1 |= ((uint16_t)0x0200); // EmBitz does not recognize CR1_STOP_Set
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96 | I2C_errorcode = 0;
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97 | }
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98 | }
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99 |
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100 | void I2C1_ER_IRQHandler(){
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101 | if(I2C1->SR1 & I2C_SR1_AF)
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102 | I2C_errorcode = 1; // No devise with that adress
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103 | else{
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104 | I2C_errorcode = 2; // Something strange occured, inspect SR1
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105 | }
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106 | }
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107 |
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108 | void I2C_initiate_transmission(){ // it`s fire and forget
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109 | while(I2C1->SR2 & I2C_SR2_BUSY){} // wait for the bus to become free (maybe not required)
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110 | I2C1->CR1 |= ((uint16_t)0x0100); // send start condition; EmBitz doesnt recognize it also
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111 | I2C_errorcode = -1; // lock the I2C variables
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112 | }
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113 |
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114 |
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115 | int main(void)
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116 | {
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117 | Init();
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118 |
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119 |
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120 | I2C_reading_pointer = OLED_init;
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121 | I2C_num_bytes = 29;
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122 | I2C_addr = 0x78;
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123 |
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124 | I2C_initiate_transmission();
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125 |
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126 | while(I2C_errorcode != 0){}
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127 |
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128 | uint8_t foo[2] = {0x40,0xff};
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129 |
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130 | I2C_reading_pointer = foo;
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131 | I2C_num_bytes = 2;
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132 |
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133 | I2C_initiate_transmission();
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134 |
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135 | while(1)
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136 | {
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137 |
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138 | }
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139 | }
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