mcp3564_update_8bits
ret = mcp3564_update_8bits(adc, MCP3564_CONFIG2_REG, MCP3564_CONFIG2_BOOST_CURRENT_MASK,
ret = mcp3564_update_8bits(adc, MCP3564_CONFIG2_REG, MCP3564_CONFIG2_AZ_MUX_MASK,
ret = mcp3564_update_8bits(adc, MCP3564_CONFIG2_REG, MCP3564_CONFIG2_AZ_REF_MASK,
ret = mcp3564_update_8bits(adc, MCP3564_CONFIG0_REG,
ret = mcp3564_update_8bits(adc, MCP3564_CONFIG1_REG,
ret = mcp3564_update_8bits(adc, MCP3564_CONFIG2_REG,