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Lee Lup Yuen 2022-10-07 10:17:05 +08:00
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README.md
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@ -2992,40 +2992,7 @@ HELLO ZIG ON PINEPHONE!
With Zig, we create a Quick Prototype of the NuttX Driver for MIPI DSI: [display.zig](display.zig)
```zig
/// Write to MIPI DSI. See https://lupyuen.github.io/articles/dsi#transmit-packet-over-mipi-dsi
pub export fn nuttx_mipi_dsi_dcs_write(
dev: [*c]const mipi_dsi_device, // MIPI DSI Host Device
channel: u8, // Virtual Channel ID
cmd: u8, // DCS Command
buf: [*c]u8, // Transmit Buffer
len: usize // Length of Buffer
) isize { // On Success: Return number of written bytes. On Error: Return negative error code
_ = dev; _ = buf;
debug("mipi_dsi_dcs_write: channel={}, cmd={x}, len={}", .{ channel, cmd, len });
// TODO
// - Write the Long Packet to DSI_CMD_TX_REG
// (DSI Low Power Transmit Package Register) at Offset 0x300 to 0x3FC.
//
// - Set the Packet Length (TX_Size) in Bits 0 to 7 of
// DSI_CMD_CTL_REG (DSI Low Power Control Register) at Offset 0x200.
//
// - Set DSI_INST_JUMP_SEL_REG (Offset 0x48, undocumented)
// to begin the Low Power Transmission.
//
// - Disable DSI Processing: Set Instru_En to 0.
// - Then Enable DSI Processing: Set Instru_En to 1.
//
// - To check whether the transmission is complete, we poll on Instru_En.
//
// Instru_En is Bit 0 of DSI_BASIC_CTL0_REG
// (DSI Configuration Register 0) at Offset 0x10.
std.debug.panic("nuttx_mipi_dsi_dcs_write not implemented", .{});
return 0;
}
```
https://github.com/lupyuen/pinephone-nuttx/blob/442a44aaa1a8c13efb8181d6789aa63d7125c972/display.zig#L48-L86
This MIPI DSI Interface is compatible with Zephyr MIPI DSI...