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SGPIO: Hi-Z data bus before setting direction pin.

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Another tactic to avoid bus contention, however brief.
This commit is contained in:
Jared Boone 2016-08-13 16:46:02 -07:00
parent 62d2ae2336
commit 52c089c4df
1 changed files with 4 additions and 2 deletions
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6
firmware/common/baseband_sgpio.cpp
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@ -298,10 +298,12 @@ constexpr P_OUT_CFG data_p_out_cfg(
void SGPIO::configure(const Direction direction) {
disable_all_slice_counters();
LPC_SGPIO->GPIO_OUTREG = gpio_outreg(direction);
// Set data pins as input, temporarily.
LPC_SGPIO->GPIO_OENREG = gpio_oenreg(Direction::Receive);
// Now that data pins are inputs, safe to change CPLD direction.
LPC_SGPIO->GPIO_OUTREG = gpio_outreg(direction);
LPC_SGPIO->OUT_MUX_CFG[ 8] = out_mux_cfg(P_OUT_CFG::DOUT_DOUTM1, P_OE_CFG::GPIO_OE);
LPC_SGPIO->OUT_MUX_CFG[ 9] = out_mux_cfg(P_OUT_CFG::DOUT_DOUTM1, P_OE_CFG::GPIO_OE);
LPC_SGPIO->OUT_MUX_CFG[10] = out_mux_cfg(P_OUT_CFG::GPIO_OUT, P_OE_CFG::GPIO_OE);