83 lines
2.7 KiB
C
83 lines
2.7 KiB
C
// Copyright 2021 IOsetting <iosetting(at)outlook.com>
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/**
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* Scan to find most close VRTRIM and IRTRIM for specified frequency.
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*
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* Change build_flags in platformio.ini
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* D__CONF_FOSC -> target frequency, e.g. 36864000UL
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* D__CONF_MCU_MODEL -> MCU type, e.g. MCU_MODEL_STC8H3K64S2
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* D__CONF_IRCBAND -> frequency band depending on the frequency
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* STC8H1K - 00:20MHz, 01:35MHz
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* STC8H3K,STC8H8K - 02:24MHz, 03:40MHz
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*
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* Connect UART at baud 115200 and read output, when the output is not garbled,
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* find the middle value of VRTRIM and IRTRIM, lower VRTRIM is preferred
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*/
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#include "fw_hal.h"
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uint8_t readCode(uint8_t offset)
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{
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return (*(unsigned char volatile __CODE *)(__CID_ADDR + offset));
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}
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void main(void)
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{
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uint8_t i, j, vrtrim = 0x01, irtrim = 0;
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// Set system clock. Invoke it to set the frequency band
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SYS_SetClock();
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// UART1 configuration: baud 115200 with Timer2, 1T mode, no interrupt
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UART1_Config8bitUart(UART1_BaudSource_Timer2, HAL_State_ON, 115200);
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while(1)
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{
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// The upper limit of IRTRIM depends on VRTRIM, MCU becomes unstable if it goes
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// too high, set 0x30 to a lower value if scan stucks at beginning
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if (++irtrim == 0x30 + vrtrim)
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{
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irtrim = 0x00;
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// VRTRIM controls the voltage level, normally it won't exceed 0x40
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if (++vrtrim == 0x40)
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{
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vrtrim = 0x00;
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}
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}
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SYS_TrimClock(vrtrim, irtrim);
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UART1_TxString("ADDR: 0x");
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UART1_TxHex(__CID_ADDR >> 8);
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UART1_TxHex(__CID_ADDR & 0xFF);
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UART1_TxString("\r\n");
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UART1_TxString("MCUID: ");
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for (j = 0; j < 7; j++)
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{
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UART1_TxHex(readCode(18 + j));
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UART1_TxChar(' ');
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}
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UART1_TxString("\r\n");
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UART1_TxString("Current IRCBAND:");
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UART1_TxHex(IRCBAND);
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UART1_TxString(", VRTRIM:");
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UART1_TxHex(VRTRIM);
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UART1_TxString(", IRTRIM:");
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UART1_TxHex(IRTRIM);
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UART1_TxString(", LIRTRIM:");
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UART1_TxHex(LIRTRIM);
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UART1_TxString("\r\n\r\n");
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SYS_Delay(50);
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}
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} |