STV090x_TSTTNR2
{ STV090x_TSTTNR2, 0x21 },
reg = stv090x_read_reg(state, STV090x_TSTTNR2);
if (stv090x_write_reg(state, STV090x_TSTTNR2, reg) < 0)
reg = stv090x_read_reg(state, STV090x_TSTTNR2);
if (stv090x_write_reg(state, STV090x_TSTTNR2, reg) < 0)
{ STV090x_TSTTNR2, 0x21 },