Gaviar (小志掌機) >> Assembly

LEDC

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參考資訊：
1. ws2812c
2. Delay_slot
3. FlatHeadBro

LED是連接到PE5


GPIO位址


PE_CFG0(0x0101 = LEDC-DO)


LEDC Clock可以使用HOSC、PeriPLL1x


CCU位址


LEDC Clock


目前使用HOSC


Clock Reset、Gating


目前關閉DMA


main.s

    .global _start
 
    .equ CCU_BASE,     0x02001000
    .equ GPIO_BASE,    0x02000000
    .equ LEDC_BASE,    0x02008000
    .equ PE_CFG0,      0x00c0
    .equ _1S,          200000000

    .equ LEDC_CLK_REG,              0x0bf0
    .equ LEDC_BGR_REG,              0x0bfc
    .equ LEDC_CTRL_REG,             0x0000
    .equ LED_T01_TIMING_CTRL_REG,   0x0004
    .equ LEDC_DATA_FINISH_CNT_REG,  0x0008
    .equ LED_RESET_TIMING_CTRL_REG, 0x000c
    .equ LEDC_WAIT_TIME0_CTRL_REG,  0x0010
    .equ LEDC_DATA_REG,             0x0014
    .equ LEDC_DMA_CTRL_REG,         0x0018
    .equ LEDC_INT_CTRL_REG,         0x001c
    .equ LEDC_INT_STS_REG,          0x0020
    .equ LEDC_WAIT_TIME1_CTRL_REG,  0x0028
   
    .text
    .long 0x4000006f
    .byte 'e','G','O','N','.','B','T','0'
    .long 0x5F0A6C39
    .long 0x8000
    .long 0, 0
    .long 0, 0, 0, 0, 0, 0, 0, 0
    .long 0, 0, 0, 0, 0, 0, 0, 0
 
    .org 0x0400
_start:
    li t0, (1 << 16) | (1 << 0)
    li a0, CCU_BASE + LEDC_BGR_REG
    sw t0, 0(a0)

    li t0, (1 << 31)
    li a0, CCU_BASE + LEDC_CLK_REG
    sw t0, 0(a0)

    li t0, 0x500000
    li a0, GPIO_BASE + PE_CFG0
    sw t0, 0(a0)
    
    li t0, (0x14 << 21) | (0x06 << 16) | (0x07 << 6) | (0x13 << 0)
    li a0, LEDC_BASE + LED_T01_TIMING_CTRL_REG
    sw t0, 0(a0)
    
    li t0, (0x1d4c << 16)
    li a0, LEDC_BASE + LEDC_DATA_FINISH_CNT_REG
    sw t0, 0(a0)
    
    li t0, (0x1d4c << 16)
    li a0, LEDC_BASE + LED_RESET_TIMING_CTRL_REG
    sw t0, 0(a0)
    
    li t0, (0xff << 0)
    li a0, LEDC_BASE + LEDC_WAIT_TIME0_CTRL_REG
    sw t0, 0(a0)
    
    li t0, 0
    li a0, LEDC_BASE + LEDC_DMA_CTRL_REG
    sw t0, 0(a0)
    
    li t0, 0
    li a0, LEDC_BASE + LEDC_INT_CTRL_REG
    sw t0, 0(a0)

    li t1, 0
    li t2, (1 << 12)
0:
    li t0, (1 << 16) | (1 << 5) | (1 << 4) | (1 << 3) | (1 << 2) | (1 << 0)
    li a0, LEDC_BASE + LEDC_CTRL_REG
    sw t0, 0(a0)

    xor t1, t1, t2
    li a0, LEDC_BASE + LEDC_DATA_REG
    sw t1, 0(a0)
1:
    li a0, LEDC_BASE + LEDC_INT_STS_REG
    lw t0, 0(a0)
    and t0, t0, 1
    beqz t0, 1b
    sw t0, 0(a0)

    li t0, _1S
    jal delay
    j 0b

delay:
    addi t0, t0, -1
    bgtz t0, delay
    jr ra
    .end

完成

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