66 lines
2.0 KiB
C
66 lines
2.0 KiB
C
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#include <driver/i2c.h>
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static gpio_num_t i2c_gpio_sda = 18;
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static gpio_num_t i2c_gpio_scl = 17;
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static gpio_num_t i2c_pull_enable = 3;
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static i2c_port_t i2c_port = I2C_NUM_0;
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static uint32_t i2c_frequency = 100000;
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// I2C master doesn't need buffers
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#define I2C_MASTER_TX_BUF_DISABLE 0
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#define I2C_MASTER_RX_BUF_DISABLE 0
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#define WRITE_BIT I2C_MASTER_WRITE
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#define ACK_CHECK_EN 0x1
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void i2c_init(void) {
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i2c_driver_install(
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i2c_port, I2C_MODE_MASTER, I2C_MASTER_RX_BUF_DISABLE, I2C_MASTER_TX_BUF_DISABLE, 0);
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i2c_config_t conf = {
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.mode = I2C_MODE_MASTER,
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.sda_io_num = i2c_gpio_sda,
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.sda_pullup_en = GPIO_PULLUP_ENABLE,
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.scl_io_num = i2c_gpio_scl,
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.scl_pullup_en = GPIO_PULLUP_ENABLE,
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.master.clk_speed = i2c_frequency,
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};
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ESP_ERROR_CHECK(i2c_param_config(i2c_port, &conf));
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gpio_config_t io_conf = {};
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io_conf.intr_type = GPIO_INTR_DISABLE;
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io_conf.mode = GPIO_MODE_OUTPUT;
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io_conf.pin_bit_mask = (1ULL << i2c_pull_enable);
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io_conf.pull_down_en = 0;
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io_conf.pull_up_en = 0;
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ESP_ERROR_CHECK(gpio_config(&io_conf));
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// enable pullups
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gpio_set_level(i2c_pull_enable, 0);
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}
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void i2c_scan(void) {
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uint8_t address;
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printf(" 0 1 2 3 4 5 6 7 8 9 a b c d e f\r\n");
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for(int i = 0; i < 128; i += 16) {
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printf("%02x: ", i);
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for(int j = 0; j < 16; j++) {
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fflush(stdout);
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address = i + j;
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i2c_cmd_handle_t cmd = i2c_cmd_link_create();
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i2c_master_start(cmd);
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i2c_master_write_byte(cmd, (address << 1) | WRITE_BIT, ACK_CHECK_EN);
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i2c_master_stop(cmd);
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esp_err_t ret = i2c_master_cmd_begin(i2c_port, cmd, 50 / portTICK_RATE_MS);
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i2c_cmd_link_delete(cmd);
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if(ret == ESP_OK) {
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printf("%02x ", address);
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} else if(ret == ESP_ERR_TIMEOUT) {
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printf("UU ");
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} else {
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printf("-- ");
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}
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}
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printf("\r\n");
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}
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}
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