Gaviar (小志掌機) >> Assembly

PWM7

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

LCD背光是連接到PD22(PWM7)


PWM_BGR_REG


PD22 PWM7


PCCR67


PCGR


PER


PCR


PPR


main.s

    .global _start

    .equ CCU_BASE,  0x02001000
    .equ PWM_BASE,  0x02000c00
    .equ GPIO_BASE, 0x02000000

    .equ PWM_BGR_REG, 0x07ac
    .equ PD_CFG2,     0x0098
    .equ PCCR67,      0x002c
    .equ PCGR,        0x0040
    .equ PER,         0x0080
    .equ PCR,         (0x0100 + 0x0000 + (7 * 0x0020))
    .equ PPR,         (0x0100 + 0x0004 + (7 * 0x0020))
    .equ PCNTR,       (0x0100 + 0x0008 + (7 * 0x0020))
    
    .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 + PWM_BGR_REG
    sw t0, 0(a0)

    li t0, (5 << 24)
    li a0, GPIO_BASE + PD_CFG2
    sw t0, 0(a0)

    li t0, (8 << 0)
    li a0, PWM_BASE + PCCR67
    sw t0, 0(a0)

    li t0, (255 << 0)
    li a0, PWM_BASE + PCR
    sw t0, 0(a0)

    li t0, (660 << 16) | (330 << 0)
    li a0, PWM_BASE + PPR
    sw t0, 0(a0)

    li t0, (1 << 7)
    li a0, PWM_BASE + PCGR
    sw t0, 0(a0)

    li t0, (1 << 7)
    li a0, PWM_BASE + PER
    sw t0, 0(a0)
0:
    j 0b
    .end

完成

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