Posted on May 17, 2011 at 09:36I have been unable to get this very simple program to work on an str9:
#include ''91x_lib.h''
static GPIO_TypeDef *GPIO4 = (GPIO_TypeDef*)GPIO4_BASE;
static SCU_TypeDef *SCU = (SCU_TypeDef*)SCU_BASE;
static FMI_TypeDef *FMI = (FMI_TypeDef*)FMI_BASE;
void main()
{
/* Set the peripheral Clock to MCLK/2 */
/* And main clock to the oscillator */
SCU->CLKCNTR = 0x00020082;
// Disable port reset
SCU->PRR0 |= 0xffffffff;
SCU->PRR1 |= 0xffffffff;
// SCU->PRR1 |= __GPIO4;
// Digital mode
SCU->GPIOANA = 0x00;
SCU->PCGRO = 0xffffffff;
// Enable GPIO port clock
SCU->PCGR1 |= 0xffffffff;
// SCU->PCGR1 |= __GPIO4;
// Enable alternate output 1
SCU->GPIOOUT[4] = 0x1 << 8;
// Push/Pull mode
SCU->GPIOTYPE[4] = 0x0;
// Output direction
GPIO4->DDR |= GPIO_Pin_0;
// Disconnect from input
SCU->GPIOIN[4] = 0;
// Pin value
GPIO4->DR[GPIO_Pin_0 << 2] = 1;
while(1)
;
}
The idea is just to set GPIO4 pin 0 to prove it's running. The compilation sequence is:
/opt/gnuarm/bin/arm-elf-gcc -O3 -c -I. -Ilibrary -mcpu=arm9 -nostartfiles bootloader.c -o bootloader.o
/opt/gnuarm/bin/arm-elf-gcc -mcpu=arm9 -nostartfiles -Tlinker.ld -o bootloader.elf bootloader.o
/opt/gnuarm/bin/arm-elf-objcopy bootloader.elf -O binary bootloader.bin
The symbol offsets are:
0000000000000000 t $a
0000000040000008 B __bss_beg__
0000000040000008 A __bss_end__
0000000040000008 A _bss_end__
0000000040000000 d $d
0000000000000068 t $d
0000000040000000 D __data_beg__
0000000000000074 A __data_beg_src__
0000000040000008 D __data_end__
0000000040000008 A _end
0000000040000008 A __end__
0000000000000074 A __end_of_text__
0000000040000000 d GPIO4
0000000000000000 T main
0000000040000004 d SCU
000000004000fffc A __stack_end__
JTAG shows the flash is programmed correctly. It neither works from primary or secondary flash. The reset pin is high. Only one set of VDDQ, VSSQ, VSS, VDD pins is connected because a continuity test says they're all common. VBatt is disconnected.
GPIO4:0 is never affected during execution.
