Abstract: Online burning, as the name suggests, directly burns the chip on the circuit board, does not depend on the burning seat, is not affected by the life of the burning seat, is a low-cost IC burning method. Each product has a variety of boards, and there are many uncertainties that can cause anomalies in online programming. The author analyzes several typical situations that have recently encountered, and finds the key points of the problem one by one. 1. When you do your duty, the external watchdog does something bad. External hardware watchdogs are widely used in electronic products. If the watchdog count is not cleared in time, the watchdog will generate a reset signal to reset the target chip to prevent the chip program from running or entering an endless loop. This effectively ensures that the system can run stably, but for the chip burning work, this is a nightmare. During programming, the programmer cannot clear the external watchdog chip counter, causing the watchdog count to overflow and generate a reset signal, and resetting the target chip, which will accidentally interrupt the current chip's programming, resulting in programming failure. To eliminate this kind of phenomenon, the hardware personnel should leave the interface of the disable watchdog when designing the circuit. Through this interface, the watchdog can be disabled first, and then the burn-in work can be performed to prevent the chip from being accidentally reset by the watchdog. Caused the burning work to fail. 2. After the program is properly burned, the chip program does not run. Some electronic products have embedded batteries, especially smart bracelets, smart watches, smart phones and other products that are very popular nowadays. When the programmer burns the code of the target board, the chip needs to be reset to run the code inside. In the production of general factory lines, after the target board is burned, it will enter the test session. The non-battery-powered board will be powered on again during the test. The chip will automatically power-on reset and run, and the code can run normally. With the battery, since the battery is always powered, there is no power-on reset, the chip code can't run. , causing subsequent test sessions to fail. In response to this situation, the P800-ISP has specifically added a reset action (including software reset, reset pin reset), as shown in the following figure. In the combined operation, after the chip code erases the program verification pass, the [Reset] action is run, so that the battery-equipped devices can be reset and start working for subsequent product testing. Graphic: Improve the burning process 3, line length, speed and stability The communication quality between the programmer and the target board is related to the length of the communication cable and the communication speed. The longer the cable, the higher the communication rate, the lower the communication quality and the stability of the programming. In order to make the burning work fast and stable, it is necessary to select the line length suitable for the target board according to the specific situation, and set an appropriate communication rate according to the line length. 4, power supply impact The online programmer can generally supply power to the target board, but the power supply capability is limited. For the target board with extremely high power consumption, as shown in the figure below, if the programmer is used to supply power, the programmer will be powerless, and then external direct power supply is required. In another case, the target board consumes a small amount of power, but a lot of it is placed. Capacitor, when the programmer starts to supply power to the target board, it will generate an instantaneous large charging current, which is a surge effect, which is easy to trigger the overcurrent protection of the programmer. At this time, the target board is preferably powered directly from the outside. In view of this situation, the P800-ISP adopts an innovative power supply mechanism and an overcurrent detection algorithm, which effectively reduces the probability of occurrence of overcurrent protection caused by the surge effect. to sum up The above points are often considered in the online burning work. In order to make the online burning production work stable, fast and orderly, it is necessary to take effective measures according to the specific conditions of each board to avoid abnormal situations. Improve the efficiency of burning.
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