REG_FE
stmpe_gpio->regs[REG_FE][regoffset] |= mask;
stmpe_gpio->regs[REG_FE][regoffset] &= ~mask;
[REG_FE][LSB] = STMPE_IDX_GPFER_LSB,
[REG_FE][CSB] = STMPE_IDX_GPFER_CSB,
[REG_FE][MSB] = STMPE_IDX_GPFER_MSB,