1.1. MCU Domain PINMUX Setup
MCU domain has 34 pins（id）which can be setup. Every pin has its own functions accordingly as the below table:
| id | function0 | function1 | function2 | function3 | function4 |
|---|---|---|---|---|---|
| 1 | POWERDOWN | PD1PORT01 | |||
| 2 | UART0RX | PD1PORT02 | |||
| 3 | UART0TX | PD1PORT03 | |||
| 4 | OTPAVDDEN | PD1PORT04 | |||
| 5 | SDBGTDI | DDBGTDI | SNDBGTDI | PD1PORT05 | |
| 6 | SDBGTDO | DDBGTDO | SNDBGTDO | PD1PORT06 | |
| 7 | SDBGTMS | DDBGTMS | SNDBGTMS | PCM1INBCLK | PD1PORT07 |
| 8 | SDBGTCK | DDBGTCK | SNDBGTCK | PCM1INLRCK | PD1PORT08 |
| 9 | SDBGTRST | DDBGTRST | SNBGTRST | PCM1INDAT0 | PD1PORT09 |
| 11 | PCM1INBCLK | PD1PORT11 | |||
| 12 | PCM1INLRCK | PD1PORT12 | |||
| 13 | PCM1INDAT0 | PD1PORT13 | |||
| 14 | PCMOUTMCLK | DUARTTX | SNUARTTX | PD1PORT14 | |
| 15 | PCMOUTDAT0 | SPDIF | PD1PORT15 | ||
| 16 | PCMOUTLRCK | PD1PORT16 | |||
| 17 | PCMOUTBCLK | PD1PORT17 | |||
| 18 | UART1RX | PD1PORT18 | |||
| 19 | UART1TX | PD1PORT19 | |||
| 20 | DDBGTDI | SNDBGTDI | PD1PORT20 | ||
| 21 | DDBGTDO | SNDBGTDO | PD1PORT21 | ||
| 22 | DDBGTMS | SNDBGTMS | PD1PORT22 | ||
| 23 | DDBGTCK | SNDBGTCK | PD1PORT23 | ||
| 24 | DDBGTRST | SNDBGTRST | PD1PORT24 | ||
| 25 | DUARTTX | SNUARTTX | PD1PORT25 | ||
| 26 | SDA0 | PD1PORT26 | |||
| 27 | SCL0 | PD1PORT27 | |||
| 28 | SDA1 | PD1PORT28 | |||
| 29 | SCL1 | PD1PORT29 | |||
| 30 | PCM0INDAT1 | PDMDAT3 | PD1PORT30 | ||
| 31 | PCM0INDAT0 | PDMDAT2 | PD1PORT31 | ||
| 32 | PCM0INMCLK | PDMDAT1 | PD1PORT32 | ||
| 33 | PCM0INLRCK | PDMDAT0 | PCM0OUTLRCK | PD1PORT33 | |
| 34 | PCM0INBCLK | PDMCLK | PCM0OUTBCLK | PD1PORT34 | |
| 35 | IR | PD1PORT35 |
The PINMUX in MCU domain is setup in the below code：
$(K18DIR)/vsp/mcu/board/nationalchip/leo_k18_universal/misc_board.c
static const PADMUX_PAD_CONFIG _pad_configs[] = {
/ id| func // function0 | function1 | function2 | function3 | function4 /
{ 1, 0}, // POWERDOWN | PD1PORT01 |
{ 2, 0}, // UART0RX | PD1PORT02 |
{ 3, 0}, // UART0TX | PD1PORT03 |
…
{33, 1}, // PCM0INLRCK | PDMDAT0 | PCM0OUTLRCK | PD1PORT33
{34, 1}, // PCM0INBCLK | PDMCLK | PCM0OUTBCLK | PD1PORT34
{35, 1}, // IR | PD1PORT35
};
The first column stands for K18 MCU port id. The other columns stand for the port functions. According to K18 spec, PINMUX table show every MCU port functions accordingly.