[问答]

L138 DSP与ARM通讯中断怎么解决？

2020-8-11 14:27:18 1255 ARM

0 问题：在DSP触发中断SYSCFG_CHIPINT0（28）一次，ARM能收到两次。有用过的指点一下附相关代码： /******************************************* * DSP 代码 main.c ******************************************/ struct mdsp_info g_ctx; #pragma DATA_SECtiON(g_ctx,"mem_stru") void ARM_Interrupt() [ L138_SYSTEM->CHIPSIG\|=0x0000001; ] void udelay(int n) [ int f=4561000; while(n>0)[ n--; while(f>0) [ f--; __asm("NOP"); ] ] ] void main() [ struct mdsp_info info=(struct mdsp_info )&g_ctx; L138_init();// pinmux etc... for(;;) [ ARM_Interrupt(); udelay(41000); info->resvd1[6]++; ] ] ////////////////////////////////////////// // cmd 文件 ////////////////////////////////////////// SECTIONS [ boot > BOOT_MEM [ -l bios.a674 (.sysinit) ] mem_stru [] >0x80000000 ] /***************************************** * ARM Linux驱动代码 *****************************************/ struct mdsp_info p_mdsp=NULL; #define CHIPSIG (volatile unsigned int)DA8XX_SYSCFG0_VIRT(0x174) static int mdsp_open(struct inode inode, struct file filp) [ return 0; ] static int mdsp_release(struct inode inode, struct file filp) [ return 0; ] static ssize_t mdsp_read(struct file* file, char __user buf, size_t size, loff_t off) [ return 0; ] static ssize_t mdsp_write(struct file* file, char __user buf, size_t size, loff_t off) [ return 0; ] static long mdsp_ioctl (struct file * filp, unsigned int cmd, unsigned long arg) [ struct mdsp_info info = (struct mdsp_info )p_mdsp; void __user argp = (void __user )arg; printk("dsp_int=%d arm_int=%dn", info->resvd1[6], info->resvd1[8]); return 0; ] static const struct file_operations mdsp_fops = [ .owner = THIS_MODULE, .read = mdsp_read, .write = mdsp_write, .open = mdsp_open, .release = mdsp_release, .unlocked_ioctl = mdsp_ioctl, ]; static struct miscdevice mdsp_dev = [ MISC_DYNAMIC_MINOR, "mdsp", &mdsp_fops ]; static irqreturn_t dsp_data_isr(int irq, void* ctx) [ struct mdsp_info info=(struct mdsp_info )ctx; (CHIPSIG_CLR) \|=0x1; info->resvd1[8]++; return IRQ_HANDLED; ] static int __init mdsp_init(void) [ p_mdsp = (struct mdsp_info)ioremap_nocache((dma_addr_t)0x80000000, 0x20000); memset((void)p_mdsp, 0, sizeof(struct mdsp_info)); request_irq(28, dsp_data_isr, IRQF_TRIGGER_RISING\|IRQF_DISABLED, "mdsp", (void)p_mdsp); misc_register(&mdsp_dev); return 0; ] static int __exit mdsp_exit(void) [ free_irq(28, (void)p_mdsp); misc_deregister(&mdsp_dev); if (p_mdsp) [ iounmap(p_mdsp); p_mdsp = NULL; ] ] module_init(mdsp_init); module_exit(mdsp_exit); 0
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0 请参考勘误表http://www.ti.com/lit/pdf/sprz301 Advisory 2.3.5 A Single CHIPINTn Interrupt Event Will Register Multiple Times in the DSP Event Combiner Module (ECM) http://processors.wiki.ti.com/index.php/Main_Page Think Over Before Asking. http://www.catb.org/~esr/faqs/smart-questions.html#goal

2020-8-11 14:46:17 评论举报 1^# 李波