Switch PicoSoC firmware to C
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Clifford Wolf
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48f729d13c
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cfd4933272
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@ -49,8 +49,8 @@ hx8kdemo.bin: hx8kdemo.asc
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# ---- Example Firmware ----
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firmware.elf: sections.lds firmware.S
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riscv32-unknown-elf-gcc -Wl,-Bstatic,-T,sections.lds,--strip-debug -ffreestanding -nostdlib -o firmware.elf firmware.S
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firmware.elf: sections.lds start.s firmware.c
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riscv32-unknown-elf-gcc -Wl,-Bstatic,-T,sections.lds,--strip-debug -ffreestanding -nostdlib -o firmware.elf start.s firmware.c
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firmware.hex: firmware.elf
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riscv32-unknown-elf-objcopy -O verilog firmware.elf /dev/stdout | sed -e '2,65537 d;' > firmware.hex
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@ -1,126 +0,0 @@
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// write RAM code (a sequence of nops followed by ret)
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li x5,0x00000013 // nop
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sw x5,4(x0)
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sw x5,8(x0)
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sw x5,12(x0)
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sw x5,16(x0)
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sw x5,20(x0)
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sw x5,24(x0)
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sw x5,28(x0)
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sw x5,32(x0)
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sw x5,36(x0)
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sw x5,40(x0)
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sw x5,44(x0)
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sw x5,48(x0)
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sw x5,52(x0)
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sw x5,56(x0)
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sw x5,60(x0)
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sw x5,64(x0)
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sw x5,68(x0)
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sw x5,72(x0)
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sw x5,76(x0)
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sw x5,80(x0)
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sw x5,84(x0)
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sw x5,88(x0)
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sw x5,92(x0)
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sw x5,96(x0)
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sw x5,100(x0)
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sw x5,104(x0)
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sw x5,108(x0)
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sw x5,112(x0)
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sw x5,116(x0)
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sw x5,120(x0)
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sw x5,124(x0)
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sw x5,128(x0)
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sw x5,132(x0)
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sw x5,136(x0)
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sw x5,140(x0)
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sw x5,144(x0)
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sw x5,148(x0)
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sw x5,152(x0)
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sw x5,156(x0)
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sw x5,160(x0)
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sw x5,164(x0)
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sw x5,168(x0)
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sw x5,172(x0)
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sw x5,176(x0)
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sw x5,180(x0)
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sw x5,184(x0)
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sw x5,188(x0)
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sw x5,192(x0)
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li x5,0x00008067 // ret
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sw x5,196(x0)
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// write a few chars to UART
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li x5,0x02000004
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li x6,104
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sw x6,0(x5)
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li x5,0x02000008
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li x6,'H'
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sw x6,0(x5)
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li x6,'e'
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sw x6,0(x5)
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li x6,'l'
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sw x6,0(x5)
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li x6,'l'
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sw x6,0(x5)
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li x6,'o'
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sw x6,0(x5)
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li x6,' '
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sw x6,0(x5)
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li x6,'W'
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sw x6,0(x5)
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li x6,'o'
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sw x6,0(x5)
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li x6,'r'
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sw x6,0(x5)
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li x6,'l'
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sw x6,0(x5)
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li x6,'d'
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sw x6,0(x5)
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li x6,'!'
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sw x6,0(x5)
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li x6,'\r'
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sw x6,0(x5)
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li x6,'\n'
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sw x6,0(x5)
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#if 0
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// switch spimemio to continous qspi ddr mode
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li x5,0x02000000
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li x6,0x80000071
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sw x6,0(x5)
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#endif
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// setup gpio address in x5
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li x5,0x03000000
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sw x0,0(x5)
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// initial entry point into RAM code
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li x3,4
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// initialize RAM counter
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sw x0,0(x0)
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// start of loop. remember this address
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auipc x4,0
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// execute RAM code, come back here
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jalr x3
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// load counter and increment
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lw x6,0(x0)
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addi x6,x6,1
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// store counter and update gpios
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sw x6,0(x5)
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sw x6,0(x0)
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// calculate new entry point into RAM code
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slli x3,x6,2
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andi x3,x3,127
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addi x3,x3,32
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// execute RAM code, come back to start of loop
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mv x1,x4
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jr x3
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@ -0,0 +1,27 @@
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#include <stdint.h>
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#define reg_spictrl (*(volatile uint32_t*)0x02000000)
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#define reg_uart_clkdiv (*(volatile uint32_t*)0x02000004)
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#define reg_uart_data (*(volatile uint32_t*)0x02000008)
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#define reg_leds (*(volatile uint32_t*)0x03000000)
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void main()
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{
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reg_uart_clkdiv = 104;
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reg_leds = 1;
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reg_uart_data = 'H';
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reg_leds = 2;
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reg_uart_data = 'e';
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reg_leds = 3;
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reg_uart_data = 'l';
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reg_leds = 4;
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reg_uart_data = 'l';
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reg_leds = 5;
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reg_uart_data = 'o';
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reg_leds = 6;
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reg_uart_data = '\r';
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reg_leds = 7;
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reg_uart_data = '\n';
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reg_leds = 8;
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}
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@ -0,0 +1,38 @@
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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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j start
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