2017-09-15 21:35:26 +08:00
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.section .text
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start:
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addi x1, zero, 0
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addi x2, zero, 0
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addi x3, zero, 0
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addi x4, zero, 0
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addi x5, zero, 0
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addi x6, zero, 0
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addi x7, zero, 0
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addi x8, zero, 0
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addi x9, zero, 0
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addi x10, zero, 0
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addi x11, zero, 0
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addi x12, zero, 0
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addi x13, zero, 0
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addi x14, zero, 0
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addi x15, zero, 0
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addi x16, zero, 0
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addi x17, zero, 0
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addi x18, zero, 0
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addi x19, zero, 0
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addi x20, zero, 0
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addi x21, zero, 0
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addi x22, zero, 0
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addi x23, zero, 0
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addi x24, zero, 0
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addi x25, zero, 0
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addi x26, zero, 0
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addi x27, zero, 0
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addi x28, zero, 0
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addi x29, zero, 0
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addi x30, zero, 0
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addi x31, zero, 0
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li sp, 4*256
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call main
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2017-09-17 04:08:05 +08:00
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loop:
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j loop
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2017-09-15 22:28:19 +08:00
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.global cmd_read_spi_flash_id_worker_begin
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.global cmd_read_spi_flash_id_worker_end
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cmd_read_spi_flash_id_worker_begin:
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2017-09-17 04:08:05 +08:00
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# address of SPI ctrl reg
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li t0, 0x02000000
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# Manual Ctrl
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li t1, 0x00
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sb t1, 3(t0)
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# CS high, IO0 is output
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li t1, 0x120
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sh t1, 0(t0)
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# CS low
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sb zero, 0(t0)
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# Send 0x9F (EDEC-ID Read)
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li t2, 0x9F
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li t3, 8
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cmd_read_spi_flash_id_worker_L1:
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srli t4, t2, 7
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andi t4, t4, 0x01
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sb t4, 0(t0)
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ori t4, t4, 0x10
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slli t2, t2, 1
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addi t3, t3, -1
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sb t4, 0(t0)
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bnez t3, cmd_read_spi_flash_id_worker_L1
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# Read 16 bytes and store in zero page
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li t3, 0
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li a2, 16
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cmd_read_spi_flash_id_worker_L2:
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li a0, 8
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li a1, 0
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cmd_read_spi_flash_id_worker_L3:
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sb zero, 0(t0)
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li t4, 0x10
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sb t4, 0(t0)
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lb t4, 0(t0)
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andi t4, t4, 2
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srli t4, t4, 1
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slli a1, a1, 1
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or a1, a1, t4
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addi a0, a0, -1
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bnez a0, cmd_read_spi_flash_id_worker_L3
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sb a1, 0(t3)
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addi t3, t3, 1
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bne t3, a2, cmd_read_spi_flash_id_worker_L2
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# back to MEMIO mode
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li t1, 0x80
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sb t1, 3(t0)
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2017-09-15 22:28:19 +08:00
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ret
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cmd_read_spi_flash_id_worker_end:
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