uint8_t u8x8_byte_riotos_hw_i2c(u8x8_t *u8g2, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
static uint8_t buffer[255];
static uint8_t index;
i2c_t dev = (i2c_t) u8g2->dev;
switch (msg) {
case U8X8_MSG_BYTE_SEND:
memcpy(&buffer[index], arg_ptr, arg_int);
index += arg_int;
break;
case U8X8_MSG_BYTE_INIT:
i2c_init_master(dev, I2C_SPEED_FAST);
break;
case U8X8_MSG_BYTE_SET_DC:
break;
case U8X8_MSG_BYTE_START_TRANSFER:
i2c_acquire(dev);
index = 0;
break;
case U8X8_MSG_BYTE_END_TRANSFER:
i2c_write_bytes(dev, u8x8_GetI2CAddress(u8g2), buffer, index);
i2c_release(dev);
break;
default:
return 0;
}
return 1;
}
/*
* HAL callback function as prescribed by the U8G2 library. This callback is invoked
* to handle I2C communications.
*/
uint8_t u8g2_esp32_i2c_byte_cb(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr) {
ESP_LOGD(TAG, "i2c_cb: Received a msg: %d, arg_int: %d, arg_ptr: %p", msg, arg_int, arg_ptr);
switch(msg) {
case U8X8_MSG_BYTE_SET_DC: {
if (u8g2_esp32_hal.dc != U8G2_ESP32_HAL_UNDEFINED) {
gpio_set_level(u8g2_esp32_hal.dc, arg_int);
}
break;
}
case U8X8_MSG_BYTE_INIT: {
if (u8g2_esp32_hal.sda == U8G2_ESP32_HAL_UNDEFINED ||
u8g2_esp32_hal.scl == U8G2_ESP32_HAL_UNDEFINED) {
break;
}
i2c_config_t conf;
conf.mode = I2C_MODE_MASTER;
ESP_LOGI(TAG, "sda_io_num %d", u8g2_esp32_hal.sda);
conf.sda_io_num = u8g2_esp32_hal.sda;
conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
ESP_LOGI(TAG, "scl_io_num %d", u8g2_esp32_hal.scl);
conf.scl_io_num = u8g2_esp32_hal.scl;
conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
ESP_LOGI(TAG, "clk_speed %d", I2C_MASTER_FREQ_HZ);
conf.master.clk_speed = I2C_MASTER_FREQ_HZ;
ESP_LOGI(TAG, "i2c_param_config %d", conf.mode);
ESP_ERROR_CHECK(i2c_param_config(I2C_MASTER_NUM, &conf));
ESP_LOGI(TAG, "i2c_driver_install %d", I2C_MASTER_NUM);
ESP_ERROR_CHECK(i2c_driver_install(I2C_MASTER_NUM, conf.mode, I2C_MASTER_RX_BUF_DISABLE, I2C_MASTER_TX_BUF_DISABLE, 0));
break;
}
case U8X8_MSG_BYTE_SEND: {
uint8_t* data_ptr = (uint8_t*)arg_ptr;
ESP_LOG_BUFFER_HEXDUMP(TAG, data_ptr, arg_int, ESP_LOG_VERBOSE);
while( arg_int > 0 ) {
ESP_ERROR_CHECK(i2c_master_write_byte(handle_i2c, *data_ptr, ACK_CHECK_EN));
data_ptr++;
arg_int--;
}
break;
}
case U8X8_MSG_BYTE_START_TRANSFER: {
uint8_t i2c_address = u8x8_GetI2CAddress(u8x8);
handle_i2c = i2c_cmd_link_create();
ESP_LOGD(TAG, "Start I2C transfer to %02X.", i2c_address>>1);
ESP_ERROR_CHECK(i2c_master_start(handle_i2c));
ESP_ERROR_CHECK(i2c_master_write_byte(handle_i2c, i2c_address | I2C_MASTER_WRITE, ACK_CHECK_EN));
break;
}
case U8X8_MSG_BYTE_END_TRANSFER: {
ESP_LOGD(TAG, "End I2C transfer.");
ESP_ERROR_CHECK(i2c_master_stop(handle_i2c));
ESP_ERROR_CHECK(i2c_master_cmd_begin(I2C_MASTER_NUM, handle_i2c, I2C_TIMEOUT_MS / portTICK_RATE_MS));
i2c_cmd_link_delete(handle_i2c);
break;
}
}
return 0;
} // u8g2_esp32_i2c_byte_cb
/* DC bit is encoded into the adr byte */
uint8_t u8x8_cad_uc16xx_i2c(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
static uint8_t in_transfer = 0;
static uint8_t is_data = 0;
uint8_t *p;
switch(msg)
{
case U8X8_MSG_CAD_SEND_CMD:
case U8X8_MSG_CAD_SEND_ARG:
if ( in_transfer != 0 )
{
if ( is_data != 0 )
{
/* transfer mode is active, but data transfer */
u8x8_byte_EndTransfer(u8x8);
/* clear the lowest two bits of the adr */
u8x8_SetI2CAddress( u8x8, u8x8_GetI2CAddress(u8x8)&0x0fc );
u8x8_byte_StartTransfer(u8x8);
}
}
else
{
/* clear the lowest two bits of the adr */
u8x8_SetI2CAddress( u8x8, u8x8_GetI2CAddress(u8x8)&0x0fc );
u8x8_byte_StartTransfer(u8x8);
}
u8x8_byte_SendByte(u8x8, arg_int);
in_transfer = 1;
break;
case U8X8_MSG_CAD_SEND_DATA:
if ( in_transfer != 0 )
{
if ( is_data == 0 )
{
/* transfer mode is active, but data transfer */
u8x8_byte_EndTransfer(u8x8);
/* clear the lowest two bits of the adr */
u8x8_SetI2CAddress( u8x8, (u8x8_GetI2CAddress(u8x8)&0x0fc)|2 );
u8x8_byte_StartTransfer(u8x8);
}
}
else
{
/* clear the lowest two bits of the adr */
u8x8_SetI2CAddress( u8x8, (u8x8_GetI2CAddress(u8x8)&0x0fc)|2 );
u8x8_byte_StartTransfer(u8x8);
}
in_transfer = 1;
p = arg_ptr;
while( arg_int > 24 )
{
u8x8->byte_cb(u8x8, U8X8_MSG_CAD_SEND_DATA, 24, p);
arg_int-=24;
p+=24;
u8x8_byte_EndTransfer(u8x8);
u8x8_byte_StartTransfer(u8x8);
}
u8x8->byte_cb(u8x8, U8X8_MSG_CAD_SEND_DATA, arg_int, p);
break;
case U8X8_MSG_CAD_INIT:
/* apply default i2c adr if required so that the start transfer msg can use this */
if ( u8x8->i2c_address == 255 )
u8x8->i2c_address = 0x070;
return u8x8->byte_cb(u8x8, msg, arg_int, arg_ptr);
case U8X8_MSG_CAD_START_TRANSFER:
in_transfer = 0;
/* actual start is delayed, because we do not whether this is data or cmd transfer */
break;
case U8X8_MSG_CAD_END_TRANSFER:
if ( in_transfer != 0 )
u8x8_byte_EndTransfer(u8x8);
in_transfer = 0;
break;
default:
return 0;
}
return 1;
}
