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hal/imxrt: Support RTT as a HAL console
UART is enabled by default (current behavior), but can be turned off by defining UART_CONSOLE_KERNEL with an empty value. RTT is enabled by defining RTT_ENABLED with a truthy value and (optionally) selecting a channel to use by RTT_CONSOLE_KERNEL (0-based). UART and RTT may be used at the same time. RTT driver reuses the control block configured by plo, which must also create a map named via RTT_SYSPAGE_MAP_NAME (default: "rtt"). Channel configuration is not altered at all, so RTT will work even when user-mode driver takes control - exception dumps will still be printed. JIRA: RTOS-754
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,158 @@ | ||
| /* | ||
| * Phoenix-RTOS | ||
| * | ||
| * SEGGER's Real Time Transfer - simplified driver | ||
| * | ||
| * Copyright 2023-2024 Phoenix Systems | ||
| * Author: Gerard Swiderski, Daniel Sawka | ||
| * | ||
| * This file is part of Phoenix-RTOS. | ||
| * | ||
| * %LICENSE% | ||
| */ | ||
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| #include "include/errno.h" | ||
| #include "syspage.h" | ||
| #include "hal/arm/barriers.h" | ||
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| #include <board_config.h> | ||
| #include "rtt.h" | ||
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| #ifndef RTT_SYSPAGE_MAP_NAME | ||
| #define RTT_SYSPAGE_MAP_NAME "rtt" | ||
| #endif | ||
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| #ifndef RTT_CB_SIZE | ||
| #define RTT_CB_SIZE 256 | ||
| #endif | ||
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| struct rtt_pipe { | ||
| const char *name; | ||
| volatile unsigned char *ptr; | ||
| unsigned int sz; | ||
| volatile unsigned int wr; | ||
| volatile unsigned int rd; | ||
| unsigned int flags; | ||
| }; | ||
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| struct rtt_desc { | ||
| char tag[16]; | ||
| unsigned int txChannels; | ||
| unsigned int rxChannels; | ||
| struct rtt_pipe channels[]; | ||
| }; | ||
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| static struct { | ||
| volatile struct rtt_desc *rtt; | ||
| } common; | ||
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| static int rtt_check(unsigned int chan, rtt_dir_t dir) | ||
| { | ||
| if ((dir == rtt_dir_up) && (chan >= common.rtt->txChannels)) { | ||
| return -ENODEV; | ||
| } | ||
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| if ((dir == rtt_dir_down) && (chan >= common.rtt->rxChannels)) { | ||
| return -ENODEV; | ||
| } | ||
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| return 0; | ||
| } | ||
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| int _hal_rttWrite(unsigned int chan, const void *buf, unsigned int count) | ||
| { | ||
| unsigned int sz; | ||
| unsigned int rd; | ||
| unsigned int wr; | ||
| unsigned int todo; | ||
| volatile unsigned char *dstBuf; | ||
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| if (rtt_check(chan, rtt_dir_up) < 0) { | ||
| return -ENODEV; | ||
| } | ||
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| hal_cpuDataMemoryBarrier(); | ||
| dstBuf = common.rtt->channels[chan].ptr; | ||
| sz = common.rtt->channels[chan].sz - 1; | ||
| rd = (common.rtt->channels[chan].rd + sz) & sz; | ||
| wr = common.rtt->channels[chan].wr & sz; | ||
| todo = count; | ||
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| /* TODO: Support all buffer modes (currently only trim is used, regardless of flags) */ | ||
| while ((todo != 0) && (rd != wr)) { | ||
| dstBuf[wr] = *(const unsigned char *)buf++; | ||
| wr = (wr + 1) & sz; | ||
| todo--; | ||
| } | ||
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| hal_cpuDataMemoryBarrier(); | ||
| common.rtt->channels[chan].wr = wr; | ||
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| return count - todo; | ||
| } | ||
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| int _hal_rttTxAvail(unsigned int chan) | ||
| { | ||
| unsigned int sz; | ||
| unsigned int rd; | ||
| unsigned int wr; | ||
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| if (rtt_check(chan, rtt_dir_up) < 0) { | ||
| return -ENODEV; | ||
| } | ||
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| hal_cpuDataMemoryBarrier(); | ||
| sz = common.rtt->channels[chan].sz - 1; | ||
| rd = (common.rtt->channels[chan].rd + sz) & sz; | ||
| wr = common.rtt->channels[chan].wr & sz; | ||
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| if (wr > rd) { | ||
| return sz + 1 - (wr - rd); | ||
| } | ||
| else { | ||
| return rd - wr; | ||
| } | ||
| } | ||
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| int _hal_rttReset(unsigned int chan, rtt_dir_t dir) | ||
| { | ||
| if (rtt_check(chan, dir) < 0) { | ||
| return -ENODEV; | ||
| } | ||
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| hal_cpuDataMemoryBarrier(); | ||
| if (dir == rtt_dir_up) { | ||
| common.rtt->channels[chan].wr = common.rtt->channels[chan].rd; | ||
| } | ||
| else { | ||
| chan = common.rtt->txChannels + chan; | ||
| common.rtt->channels[chan].rd = common.rtt->channels[chan].wr; | ||
| } | ||
| hal_cpuDataMemoryBarrier(); | ||
| return 0; | ||
| } | ||
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| int _hal_rttInit(void) | ||
| { | ||
| const syspage_map_t *map = syspage_mapNameResolve(RTT_SYSPAGE_MAP_NAME); | ||
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| if (map == NULL) { | ||
| return -ENOENT; | ||
| } | ||
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| if (map->start + RTT_CB_SIZE > map->end) { | ||
| return -EINVAL; | ||
| } | ||
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| /* TODO: Place CB always at the start of the map? */ | ||
| common.rtt = (void *)(map->end - RTT_CB_SIZE); | ||
| return 0; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| /* | ||
| * Phoenix-RTOS | ||
| * | ||
| * SEGGER's Real Time Transfer - simplified driver | ||
| * | ||
| * Copyright 2023-2024 Phoenix Systems | ||
| * Author: Gerard Swiderski, Daniel Sawka | ||
| * | ||
| * This file is part of Phoenix-RTOS. | ||
| * | ||
| * %LICENSE% | ||
| */ | ||
|
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| #ifndef HAL_ARM_RTT_H_ | ||
| #define HAL_ARM_RTT_H_ | ||
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| typedef enum { | ||
| rtt_dir_up, /* tx: target -> host */ | ||
| rtt_dir_down, /* rx: host -> target */ | ||
| } rtt_dir_t; | ||
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| typedef enum { | ||
| rtt_mode_skip = 0, /* write if the whole message can be written at once; discard the message otherwise */ | ||
| rtt_mode_trim = 1, /* write anything if possible; discard the remaining unwritten data otherwise */ | ||
| rtt_mode_blocking = 2, /* wait until writable */ | ||
| } rtt_mode_t; | ||
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| /* Initialize rtt internal structures */ | ||
| int _hal_rttInit(void); | ||
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| /* Non-blocking write to channel */ | ||
| int _hal_rttWrite(unsigned int chan, const void *buf, unsigned int count); | ||
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| /* Check for available space in tx */ | ||
| int _hal_rttTxAvail(unsigned int chan); | ||
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| /* Reset fifo pointers */ | ||
| int _hal_rttReset(unsigned int chan, rtt_dir_t dir); | ||
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| #endif /* end of HAL_ARM_RTT_H_ */ |
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